3 Department of Development Services Tim Snellings, Director Pete Calarco, Assistant Director

7 County Center Drive T: 530.552.3700 buttecounty.net/dds Oroville, California 95965 F: 530.538.7785

BUTTE COUNTY PLANNING COMMISSION NOTICE OF INTENT TO ADOPT A MITIGATED NEGATIVE DECLARATION AND NOTICE OF PUBLIC HEARING FOR TENTATIVE SUBDIVISION MAP TSM17-0001

NOTICE IS HEREBY GIVEN that the Butte County Planning Commission will hold a public hearing to consider an application for Tentative Subdivision Map TSM17-0001 (Nels Leen) on July 26, 2018, at 9:00 a.m. or shortly thereafter, in the Butte County Board of Supervisors’ Room, County Administration Center, 25 County Center Drive, Oroville, California as follows: Project Information: Project: Tentative Subdivision Map TSM17-0001 APN: 039-370-019 & 039-090-061 Location: The project site is located at 1232 Stanley Avenue, on the south side of Stanley Avenue, ¼ mile east from Dayton Road, south of the City of Chico. Proposal: The applicant is requesting approval of a Clustered Tentative Subdivision Map (TSM) to divide an approximately 18.5 acre property (two parcels) into 22 parcels (21 residential lots and one open space lot) ranging in size from 0.19 acres to 12.02 acres. The 21 clustered residential lots range in size from 0.19 acres to 0.75 acres. The proposed open space parcel, Lot A, is approximately 12.02 aces). Lots will be served by a new cul-de-sac, off of Stanley Avenue, with full urban improvements including curb, gutter, sidewalk and drainage disposal. The project proposes a community waste water system, with individual septic systems and a community wastewater area. Each parcel will be provided with domestic water service via the extension of the California Water Service Company network along Stanley Avenue. The project proposes a 300 foot residential dwelling setback from the agriculturally zoned parcels to the south. Pursuant to Butte County Code §24-56.1 (Residential Setback from Orchards and Vineyards), Development Services in consultation with the Agricultural Commissioner’s Office has recommended a residential dwelling setback from adjacent active orchard (APN 039-370-102) of either of 50 feet or 25 feet with an approved vegetation screen along the eastern property lines of parcels 13-18 and from the northern property line of parcel 11. In compliance with CEQA, this notice discloses that there are no listed toxic sites present on site. A search of the state and federal agency databases for hazardous materials sites within one-mile of the project site was performed and the project site is within one-mile of an identified clean-up site. Diamond Match Factory, a State Response clean-up site, is located approximately 0.85 miles to the northeast of the project site. The Initial Study/Mitigated Negative Declaration (IS/MND) and reference documents for these projects are on file for public review and comment starting Tuesday, June 26, 2018 through Wednesday, July 25, 2018, at the Butte County Planning Division, 7 County Center Drive, Oroville, CA. The IS/MND is also available for review on the County website at http://www.buttecounty.net/dds/Planning/CEQA.aspx. All persons are invited to review the documents. Comments may be submitted to the Planning Division in writing at the above address at any time prior to the hearing or orally at the meeting listed above, or as may be continued to a later date. If you challenge the above application in court, you may be limited to raising only those issues you or someone else raised at the public hearing or in written correspondence delivered to the Planning Commission at, or prior to the public hearing. For information call or send an email to Mark Michelena, Senior Planner, Butte County Development Services Department, Planning Division at (530) 552-3683 or [email protected]. In compliance with the Americans with Disabilities Act, if you need special assistance to participate in the hearing, please contact us at (530) 552-3663. Notification at least 72 hours prior to the hearing will enable staff to make reasonable arrangements. BUTTE COUNTY PLANNING COMMISSION TIM SNELLINGS, DIRECTOR OF DEVELOPMENT SERVICES

Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

DEVELOPMENT SERVICES DEPARTMENT

BUTTE COUNTY

INITIAL STUDY AND PROPOSED MITIGATED NEGATIVE DECLARATION

TENTATIVE SUBDIVISION MAP (CLUSTERED)

TSM17-0001 (Leen)

Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

COUNTY OF BUTTE DEPARTMENT OF DEVELOPMENT SERVICES INITIAL STUDY AND MITIGATED NEGATIVE DECLARATION FOR TENTATIVE SUBDIVISION MAP TSM 17-0001 (Leen)

1.0 PROJECT INFORMATION A. Applicant/Owner: Nels Leen (Applicant/Owner) B. Staff Contact: Mark Michelena, Senior Planner; (530) 552-3683, [email protected] C. Project Name: TSM17-0001; Leen Tentative Subdivision Map (Clustered) D. Project Location: The project site is located at 1232 Stanley Avenue, on the south side of Stanley Avenue, ¼ mile east from Dayton Road, south of the city of Chico. Township 21 North, Range 1 East, Section 19 of the Chico USGS 7.5’ Quadrangle. E. Type of Application: Tentative Subdivision Map (Clustered Development pursuant to Chapter 24, Article III, Division 8, of Butte County Code) F. Assessor Parcel Numbers: 039-090-061 and 039-370-019 G. Project Site Size: 18.5± acres H. Current Zoning: VLDR (Very Low Density Residential – (1 unit/acre density) I. General Plan Designation: VLDR (Very Low Density Residential) J. Environmental Setting: The project site encompasses approximately 18.5 acres of a largely unimproved, disturbed, vacant property located on Stanley Avenue, 0.25 miles east of Dayton Road, and approximately 0.60 miles south of the City of Chico city limits. (Figure 1) An existing single-family residence is present within APN 039-370-019, additional secondary structures include a carport, two garages, and a well. The single-family residence and additional structures will remain as Parcel 19 of the Tentative Subdivision Map (Figure 2). Additionally, irrigation infrastructure that served former agricultural practices on-site, including a well and sprinkler heads, can be found within the project boundaries. Site topography is flat, with elevations ranging from 177 feet above mean sea level (msl) in the southwestern corner of the property to 182 feet above msl in the southeastern corner of the property. The property is bordered by residential development (one with an active agricultural use (orchard)) to the north and east, on the south by Comanche Creek which separates the property from a 146-acre orchard, zoned A-40 (Agriculture – 40-acre minimum), and a mobile home park and residential development on the west. The project site is situated in the VLDR – 1.0 (Very Low Density Residential – one-acre minimum zone district), west of the Chico west of the Chico Area Greenline. This zone allows for the appropriate development of single- family homes and related uses in residential neighborhoods of the county. Standards for the VLDR zone are intended to preserve and protect the character of existing neighborhoods and ensure that new residential developments provide appropriate transition from rural to more developed areas. Permitted residential uses in the VLDR zone include a single-family home, small residential care home, second unit and accessory structures. The VLDR zone also conditionally permits non-residential uses compatible with a rural residential setting, including public and quasi- public uses, golf courses, park and recreational facilities, personal services, medical offices and clinics, and animal services. Animal grazing, crop cultivation, private stable, on-site agricultural products sales are permitted uses in the VLDR zone. The minimum permitted parcel size in the VLDR zone is 1 acre. Soils on the project site consists of Chico loam, 0 to 1 percent slopes. This unit is found on low fan terraces and derived from mixed rocks. It is well drained with a very high depth to restrictive feature (more than 80 inches). The soil is commonly used for growing almonds, walnuts, row crops, and development.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

The Butte County General Plan identifies this property to be located in the Agricultural Land vegetative community type. Agricultural lands in the county include orchard crops such as almond and walnut, rice, and a variety of row crops. Wildlife species that may use agricultural land include a variety of avian species, as well as, raccoon (Procyon lotor), coyote (Canis latrans), and Virginia opossum (Didelphis virginiana). Vegetation within the site is primarily ruderal annual species, with the exception of a few trees within the site and the riparian vegetation found along Comanche Creek. Ruderal species present include milk thistle (Silybum marianum), Johnsongrass (Sorghum halepense), sunflower (Helianthus sp.), pokeberry (Phytolacca americana), and Brassica sp. Trees present on-site include European olive (Olea europaea), persimmon (Diospyros sp.), and English walnut (Juglans regia). Three large valley oaks (Quercus lobata) can be found at the southern boundary of APN 039-370-068 which is directly adjacent to APN 039-090-061. Riparian species found along Comanche Creek are typical of riparian areas within the northern Sacramento Valley. Dominant canopy species include valley oak, western sycamore (Platanus racemosa), Oregon ash (Fraxinus latifolia), and Fremont cottonwood (Populus fremontii). Commonly encountered sub-canopy species include black walnut (Juglans hindsii) and cherry plum (Prunus cerasifera). Ground cover species within the riparian corridor included Himalayan blackberry (Rubus armeniacus), English ivy (Hedera helix), California wild grape (Vitis californica), and Santa Barbara sedge (Carex barbarae). Additionally, Blue elderberry (Sambucus nigra ssp. caerulea) was encountered within the riparian vegetation along Comanche Creek. Blue elderberry is the sole host plant for the federally threatened valley elderberry longhorn beetle. The project site is not listed on the California Department of Toxic Substances Control (DTSC) Hazardous Waste and Substances Site List (Cortese List) and is not located near any sites or sites known or suspected to contain hazardous materials. A State Response clean-up site is located approximately 1.5 miles to the northeast of the project site. This clean-up site caused the contamination of groundwater with trichloroethylene (TCE). This contaminated groundwater plume, referred to as the Victor 20th Street Plume, extends under the Stanley Park neighborhood which includes the project site. Due to the high concentration of TCE the Stanley Park neighborhood has been connected to the California Water Service (Calwater) domestic water supply. K. Surrounding Land Uses: The area surrounding the project site primarily includes single family residential development zoned VLDR with up to 1 dwelling unit per acre. The land south of the project area is a 146-acre walnut orchard zoned AG- 40.

Direction General Plan Designation Zoning Existing Land Use(s) North Very Low Density Residential VLDR – 1.0 Single-Family Residential/ Agriculture South Agricultural AG-40 Agriculture (Orchard) East Very Low Density Residential VLDR – 1.0 Single Family Residential West Very Low Density Residential VLDR – 1.0 Single Family Residential L. Project Description: The applicant is requesting approval of a Clustered Development Tentative Subdivision Map (TSM) to divide an approximately 18.5- acre property into 22 parcels (21 residential lots and one open space lot) ranging in size from 0.19 acres to 12.02 acres. The 21 clustered residential lots range in size from 0.19 to 0.75 acres and a and the open space lot is shown as Lot A (12.02 acres). Lots will be served by a new on-site cul-de-sac, off of Stanley Avenue, with full urban improvements including curb, gutter, sidewalk and drainage disposal. The proposed cul-de-sac will be 36 feet wide with additional easements on each side of the road for utilities. The total length of the road is approximately 800 feet and will include a 50-foot radius cul-de-sac at its terminus. The residence and secondary structures present in APN 039-370-019 will remain in place and become part of Parcel 19 of the TSM. The project proposes a community wastewater system with a septic tank effluent pump (STEP) system where individual septic tanks are equipped with an effluent pump to a common dose tank via a common pressure main. The pressure line and service connection (shutoff valve, check valve and valve box) will be installed for a lot at the time of other utilities and subdivision improvements. The wastewater disposal area will be located on the open space parcel (Lot A). The community wastewater system will be managed by a County Service Area (CSA) with all necessary legal entitlements and financial assurances in place as per County and Butte Local Agency Formation Commission (LAFCo) requirements. Each parcel will be provided with domestic water service via the extension of the California Water Service Company network along Stanley Avenue.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

The southern portion of the project site abuts an Agricultural Zone. The proposed project identifies a 300-foot residential setback from the southern property line. Pursuant to the requirements of Butte County Code §24-56.1 (Residential Setback from Orchards and Vineyards), the Department of Development Services in conjunction with the Agricultural Commissioner’s Office is recommending a residential dwelling setback from adjacent active orchard (APN 039-370-102) of 50 feet, or 25 feet with approved vegetation screen along the eastern property lines of Parcels 13-18 and from the northern property line of Parcel 11. Uses located within the riparian area along Comanche Creek, will be consistent with Butte County Code Chapter 24, Article III, Division 16, Riparian Areas. M. Public Agency Approvals: Tentative Subdivision Approval (County of Butte) Construction Improvement Plans (County of Butte) Storm Water Pollution Prevention Plan (Prior to Development, County of Butte) Community Wastewater System (Regional Water Quality Control Board) Formation of County Service Area (County of Butte, Butte LAFCo)

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

2.0 POTENTIALLY SIGNIFICANT EFFECTS CHECKLIST SETTING Environmental Factors Potentially Affected: Project impacts to the environmental factors checked below could be potentially significant; however, with the incorporation of mitigation measures, project related impacts are reduced to a “less than significant” level (CEQA Guidelines 15382).

Aesthetics Agriculture & Forestry Air Quality

Resources

Biological Resources Cultural Resources Geology /Soils

Greenhouse Gas Emissions Hazards & Hazardous Materials Hydrology / Water Quality

Land Use / Planning Mineral Resources Noise

Population / Housing Public Services Recreation

Transportation/Traffic Tribal Cultural Resources Utilities / Service Systems Mandatory Findings of Significance

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Evaluation of Environmental Impacts: 1) A brief explanation is required for all answers except "No Impact" answers that are adequately supported by the information sources a lead agency cites in the parentheses following each question. A "No Impact" answer is adequately supported if the referenced information sources show that the impact simply does not apply to projects like the one involved (e.g., the project falls outside a fault rupture zone). A "No Impact" answer should be explained where it is based on project-specific factors as well as general standards (e.g., the project will not expose sensitive receptors to pollutants, based on a project-specific screening analysis). 2) All answers must take account of the whole action involved, including off-site as well as on-site, cumulative as well as project-level, indirect as well as direct, and construction as well as operational impacts. 3) Once the lead agency has determined that a particular physical impact may occur, then, the checklist answers must indicate whether the impact is potentially significant, less than significant with mitigation, or less than significant. "Potentially Significant Impact" is appropriate if there is substantial evidence that an effect may be significant. If there are one or more "Potentially Significant Impact" entries when the determination is made, an EIR is required. 4) "Negative Declaration: Less Than Significant With Mitigation Incorporated" applies where the incorporation of mitigation measures has reduced an effect from "Potentially Significant Impact" to a "Less Than Significant Impact." The lead agency must describe the mitigation measures, and briefly explain how they reduce the effect to a less than significant level (mitigation measures from Section XVII, "Earlier Analyses," may be cross- referenced). 5) Earlier analyses may be used where, pursuant to the tiering, program EIR, or other CEQA process, an effect has been adequately analyzed in an earlier EIR or negative declaration. Section 15063(c)(3)(D). In this case, a brief discussion should identify the following: a) Earlier Analysis Used. Identify and state where they are available for review. b) Impacts Adequately Addressed. Identify which effects from the above checklist were within the scope of and adequately analyzed in an earlier document pursuant to applicable legal standards, and state whether such effects were addressed by mitigation measures based on the earlier analysis. c) Mitigation Measures. For effects that are "Less than Significant with Mitigation Measures Incorporated," describe the mitigation measures, which were incorporated or refined from the earlier document and the extent to which they address site-specific conditions for the project. 6) Lead agencies are encouraged to incorporate into the checklist references to information sources for potential impacts (e.g., general plans, zoning ordinances). Reference to a previously prepared or outside document should, where appropriate, include a reference to the page or pages where the statement is substantiated. 7) Supporting Information Sources: A source list should be attached, and other sources used or individuals contacted should be cited in the discussion. 8) This is only a suggested form, and lead agencies are free to use different formats; however, lead agencies should normally address the questions from this checklist that are relevant to a project's environmental effects in whatever format is selected. 9) The explanation of each issue should identify: a) The significance criteria or threshold, if any, used to evaluate each question; and b) The mitigation measure identified, if any, to reduce the impact to less than significance

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

4.0 ENVIRONMENTAL IMPACTS

4.1 Aesthetic/Visual Resources:

b. Substantially damage scenic resources, including, but not limited to, trees, rock outcroppings, and historic buildings within a state scenic highway? c. Substantially degrade the existing visual character or quality of the site and its surroundings? d. Create a new source of substantial light or glare which would adversely affect day or nighttime views in the area?

Setting: The project area is characterized as residential and agricultural lands within the rural valley region of Butte County, approximately 0.65 miles south of the City of Chico city limits, and approximately 2.65 miles west of State Route 99 (SR 99). Surrounding land uses are primarily residential but include agricultural uses (walnut and almond orchards) on lots ranging from approximately 0.29 acres up to 146 acres. The topography of the site is relatively flat to gently sloping with elevations ranging from 177 to 182 feet above mean sea level (msl). The most prominent man-made structures on-site include a single-family residence and associated structures, well pumps, and electrical utilities running to the pump. The prominent natural feature on-site is the riparian area bordering Comanche Creek which stretches for approximately 1,990 feet along the southern boundary of the project area. The riparian corridor is consistent with other riparian areas found within the northern Sacramento Valley of California. The Butte County General Plan Figures COS-7, COS-8, and COS-9 display identified scenic resources within Butte County. The scenic resources depicted in COS-7 include the land based scenic resources (Table Mountain, Butte Creek Canyon, Feather Falls Scenic Area, and the Sacramento River Wildlife Refuge) and water based scenic resources (Lake Oroville, Lake Wyandotte, Thermalito Afterbay, and Philbrook Reservoir). There are no officially designated State Scenic highways within Butte County, however, State Route 70 (SR 70) north of the intersection of State Route 149 (SR 149) is considered an eligible State Scenic Highway. As seen in Figure COS-8 in the Butte County General Plan the County has designated SR 70 through the Feather River Canyon and a portion of State Route 32 (SR 32) north of Forest Ranch as County Scenic Highways. Scenic Highway Overlay Zones are identified in Figure COS-9 of the General Plan, the zones extend 350 linear feet laterally from the centerline of each of the scenic routes identified. The Scenic Highway Overlay Zones can be found on portions of SR 32 north of Chico, the Skyway, southern portions of State Route 191 (SR 191) and Pentz Road, portions of SR 70 north of the SR 149 intersection, portions of State Route 162 (SR 162), and portions along Forbestown Road and Lumpkin Road. Based on the information presented in the Butte County General Plan, the project area is not located within, or in the vicinity of any identified scenic resources. Impact Discussion: a.) Less than significant impact. Future development of the proposed parcels includes single family residential units, potential secondary units, and accessory structures, which would be consistent with the established visual character of the surrounding area. Due to the clustering of the residential units and the overall low-density of the project (1.13 lots/acre), the placement of additional residences will not significantly interfere with the views of a scenic vista from adjacent residences or public right-of-ways. Therefore, the proposed project would not significantly affect a scenic vista nor have a demonstrable negative aesthetic effect.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 b.) Less than significant impact. No scenic resources have been identified to be on the project site, or in the surrounding area. Additionally, the project site is not located adjacent to a state-designated or county- designated scenic highway. As a result, proposed improvements would not result in the damage or degradation to any scenic features on or near the project site. Subsequent development of the resultant parcels is anticipated to be consistent with the character of the project site and surrounding area. c.) Less than significant impact. Future development of the parcels would include single-family residences, potential second units, and accessory structures. The type of housing and the parcel sizes proposed would be consistent with the character and quality of the site or surrounding area. d.) Less than significant impact. Outdoor lighting for safety and security could potentially be added to future structures on the resultant parcels. Future development of these parcels would be consistent with the residential character already established in the surrounding areas. At the time of development, outdoor lighting in residential zones would be subject to Article III, Division 4, Section 24-67 of Butte County Zoning Code, which requires that all outdoor lighting in residential areas be located, adequately shielded, and directed such that no direct light falls outside the property perimeter, or into the public right-of-way. With the adherence to outdoor lighting regulations at the time of development, the proposed project would not create new sources of substantial lighting or glare that would generate a significant impact. Mitigation Measure: None required.

4.2 Agriculture Resources:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? b. Conflict with existing zoning for agricultural use, or a Williamson Act Contract? c. Conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code section 12220(g)), timberland (as defined by Public Resources Code section 4526), or timberland zoned Timberland Production (as defined by Government Code section 51104(g))? d. Result in the loss of forest land or conversion of forest land to non-forest use? e. Involve other changes in the existing environment which, due to their location or nature, could result in conversion of Farmland, to non-agricultural use or conversion of forest land to non-forest use?

Setting: The project site is developed with a single-family residence and associated structures, septic system, well pumps, and electrical utilities running to the pump. The site is designated Very Low Density Residential (VLDR) by the Butte County General Plan and is zoned VLDR – 1.0. The VLDR zone is primarily for single-family residences on lots with a minimum parcel size of one acre. However, the applicant has submitted an application for a clustered development subdivision pursuant to Chapter 24, Article III, Division 8 of Butte County Code which allows parcel sizes less than one acre in size, but greater than 7,500 square feet. The VLDR zone allows for limited agricultural uses. Land zoned Agriculture 40 acre minimum (AG-40) is located immediately south of the project area. The project area has been historically used as orchard land.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Important Farmland To characterize the environmental baseline for agricultural resources, Important Farmland Maps produced by the California Department of Conservation’s Farmland Mapping and Monitoring Program (FMMP) were reviewed. Important Farmland Maps show categories of Prime Farmland, Farmland of Statewide Importance, Unique Farmland, Farmland of Local Importance (if adopted by the county), Grazing Land, Urban and Built-up Land, Other Land, and Water. Prime Farmland and Farmland of Statewide Importance map categories are based on qualifying soil types, as determined by the U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS), as well as current land use. These map categories are defined by the Department of Conservation’s FMMP as follows: Prime Farmland: Land which has the best combination of physical and chemical characteristics for the production of crops. It has the soil quality, growing season, and moisture supply needed to produce sustained high yields of crops when treated and managed, including water management, according to current farming methods. Farmland of Statewide Importance: Land that is similar to Prime Farmland but with minor shortcomings, such as greater slopes or less ability to hold and store moisture. Unique Farmland: Land of lesser quality soils used for the production of specific high economic value crops. It has the special combination of soil quality, location, growing season, and moisture supply needed to produce sustained high quality or high yields of a specific crop when treated and managed according to current farming methods. It is usually irrigated, but may include non-irrigated orchards or vineyards as found in some climatic zones in California. Examples of crops include oranges, olives, avocados, rice, grapes, and cut flowers. Farmland of Local Importance: Land of importance to the local agricultural economy, as determined by each county’s board of supervisors and local advisory committees. Examples include dairies, dryland farming, aquaculture, and uncultivated areas with soils qualifying for Prime Farmland and Farmland of Statewide Importance. Butte County has not adopted a definition of Farmland of Local Importance. Grazing Land: Land on which the existing vegetation, whether grown naturally or through management, is suitable for grazing or browsing of livestock. Urban and Built-up Land: Land used for residential, industrial, commercial, construction, institutional, public administrative purpose, railroad yards, cemeteries, airports, golf courses, sanitary landfills, sewage treatment plants, water control structures, and other development purposes. Highways, railroads, and other transportation facilities are also included in this category. Other Land: Land not included in any other mapping category. Common examples include low density rural developments; brush, timber, wetland, and riparian areas not suitable for livestock grazing; confined livestock, poultry or aquaculture facilities; strip mines, borrow pits; and water bodies smaller than forty acres. Vacant and nonagricultural land surrounded on all sides by urban development and greater than 40 acres is mapped as Other Land. Water: Water areas with an extent of at least 40 acres. Williamson Act The California Land Conservation Act of 1965, commonly known as the Williamson Act, was established based on numerous State legislative findings regarding the importance of agricultural lands in an urbanizing society. Policies emanating from those findings include those that discourage premature and unnecessary conversion of agricultural land to urban uses and discourage discontinuous urban development patterns, which unnecessarily increase the costs of community services to community residents. The Williamson Act authorizes each County to establish an agricultural preserve. Land that is within the agricultural preserve is eligible to be placed under a contract between the property owner and County that would restrict the use of the land to agriculture in exchange for a tax assessment that is not based on the yearly production yield. The contracts have a 9-year term that is automatically renewed each year, unless the property owner or county requests a non-renewal or the contract is cancelled. The project site is not encumbered by a Williamson Act Contract, however, land south of Comanche Creek is currently held under a Williamson Act contract. Butte County Code Section 24-81 (Agricultural Buffers) Chapter 24, Article III, Division 7 of the Butte County Zoning Ordinance establishes a 300-foot buffer between lands zoned agriculture and new residential development. This ordinance applies to parcels where residential structures are to be developed in the following areas of the county: (1) all lands zoned Agriculture; (2) in other zones within 300 feet of the boundary of Agriculture zones; (3) areas inside and within 300 feet of sphere of influence boundaries for incorporated cities, where the boundary abuts parcels zoned Agriculture; and, (4) areas within 300 feet of a Williamson Act Contract.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Exceptions to the 300-foot agricultural buffer setback requirement may be requested by the project applicant through an Unusual Circumstances Review application process (BCC §24-84). Butte County Resolution #08-166, as amended (Agricultural Buffer Guidelines) The Butte County Zoning Ordinance (Section 24-81 et seq.) requires a 300-foot buffer between agricultural and non- agricultural uses on agriculturally zoned lands. To implement this requirement, and to provide guidance regarding requests for a determination of unusual circumstances to modify the 300-foot agricultural buffer requirement, Butte County has adopted Agricultural/Residential Buffer Implementation Guidelines (Board of Supervisors Resolution 08- 166). The buffer must physically separate agricultural and residential dwellings to help minimize potential conflicts. The County may make a determination of unusual circumstances based on criteria outlined in the Guidelines, in which case the buffer may take other forms or be of a lesser distance. The proposed project identifies a 300-foot residential setback from the southern property line. Butte County Right to Farm Ordinance Chapter 35 of the Butte County Code, also referred to as the Butte County Right to Farm Ordinance (Ord. No. 4092, 02- 24-15), serves as a notification to owners, purchasers, residents, and users of property adjacent to agricultural operations of potential issues at the agriculture-urban interface. The Right to Farm Ordinance declares that properly conducted agricultural operations on agricultural land are not subject to nuisance claims, assuming the operation was not already on record as a nuisance when the operation began. Information about the Right to Farm Ordinance is provided by the County to residents with an annual tax bill and when an application is submitted for development on or adjacent to agricultural land. The Right to Farm Ordinance serves as a protection for agricultural uses that are located in nonagricultural General Plan land use designations and zoning districts. Butte County Code (BCC) §24-56.1 - Residential Setback from Orchards and Vineyards On January 12, 2016, the Butte County Board of Supervisors adopted amendments to the Butte County General Plan and Zoning Ordinance to establish a setback requirement for new residential dwelling development adjacent to existing orchards and vineyards located in residential zones. Butte County Code (BCC) §24-56.1 provides as follows: 24-56.1 Residential Setback from Orchards and Vineyards A setback is established for residential development from existing orchards and vineyards that are located in residential zones in order to reduce interference and conflict with preexisting agricultural operations, while providing for the development potential allowed by residential zones. The residential setback from orchards and vineyards is subject to the following requirements (Refer to Article 17. Agricultural Buffers, for agricultural buffer setbacks required where a developing residentially zoned parcel is adjacent to a parcel zoned Agriculture): A. A setback between a new residence and an existing active orchard or vineyard shall be established as far away from the orchard or vineyard as practicable, taking into account adjacent agricultural uses and practices, provided it does not limit the allowed residential density permitted by the residential zone, and in no case, is less than 25 feet. B. Any proposed land division adjacent to an existing active orchard or vineyard use shall apply for a Residential Setback Recommendation with the Development Services Department in accordance with this section. The Residential Setback Recommendation shall be reviewed by the Agricultural Commissioner, in consultation with Development Services to determine an appropriate setback width (pursuant to Subsection A.). The Residential Setback Recommendation shall become part of the application and reviewed by the hearing body. Public noticing shall include reference to the Residential Setback Recommendation and the residential setback’s recommended width. C. All building permits for residential development adjacent to existing orchards or vineyards shall be reviewed for compliance with the required residential setback. If no residential setback is shown on an applicable recorded parcel map or subdivision map, a review by the Zoning Administrator at a noticed public hearing shall be conducted to determine the appropriate setback pursuant to Subsection A. D. The residential setback shall be imposed from the property line (s) on the developing parcel and shown on the recorded parcel map or subdivision map or building permit site plan. E. The setback shall not apply to residential development adjacent to row crops or greenhouses and wholesale nurseries primarily engaged in growing crops, plants, vines or trees and their seeds.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

F. The setback shall not apply to backyard gardens and fruit and nut trees accessory to a residential use. G. The setback shall not apply to accessory structures as defined under Section 24‐156 (Accessory Uses and Structures) excepting guest houses, which must comply with the setback. H. The setback shall not apply to orchard or vineyard uses that start operations after a building permit is approved (this does not apply to an existing orchard or vineyard that is removed and replaced). I. If the orchard or vineyard use is discontinued (i.e., the land is developed with residential uses) the setback shall no longer be applicable. Pursuant to the requirements of Butte County Code §24-56.1 (Residential Setback from Orchards and Vineyards), the Department of Development Services in conjunction with the Agricultural Commissioner’s Office is recommending a residential dwelling setback from the adjacent orchard located on the property at 1768 Walnut Tree Lane (APN 039-370- 102) of 50 feet, or 25 feet with approved vegetation screen along the eastern property lines of Parcels 13-18 and from the northern property line of Parcel 11. Impact Discussion: a.) Less than significant impact. The majority of the project site is designated as Prime Farmland by the California Department of Conservation’s Farmland Mapping and Monitoring Program (FMMP). Areas surrounding the project site include Urban and Built-up Land to the north and west; and, Prime Farmland to the south and west. While the project site is designated as Important Farmland in the Farmland Mapping and Monitoring Program, the subject property and surrounding properties were re-designated to Very Low Density Residential (VLDR) during the 2030 General Plan update process. The Butte County General Plan 2030 Environmental Impact Report (GPEIR) analyzed the potential impacts of development of important farmlands that were designated for non-agricultural uses and adopted a Statement of Overriding Considerations for the environmental impacts of the new land designations for the project site and 1,240 acres of farmland surrounding Chico “ranging from Foothill Residential and Rural Residential to Medium High density residential (890 acres)” which includes the project area (Page 4.2-9 of the GPEIR). The GPEIR acknowledged that these actions would convert prime farmland to non-agricultural use and the Board of Supervisors adopted environmental findings and the Statement of Overriding Considerations for this significant environmental effect. b.) No impact. The project site is zoned for primarily residential uses, the VLDR zone allows for limited agricultural uses, including crop cultivation. The proposed project would not result in a change to the current zoning designation of the property, and the project site would continue to allow for limited agricultural uses. The project site is not restricted by a Williamson Act contract. The nearest property with a Williamson Act contract lies to the south of the project area on the other side of Comanche Creek. c.) No impact. The project site is not located in a timber resource zoning category such as Timber Mountain (TM), Timber Production (TPZ), or Resource Conservation (RC). The project site is also not classified as forest land, pursuant to California Public Resources Code Section 12220(g), because the project site cannot support 10 percent native tree cover. Therefore, the proposed project would not conflict with, or cause the rezoning of, a timber resource zoning designation. d.) No impact. The project site is not classified as forest land, and therefore, the proposed project would not result in loss or conversion of forest land to a non-forest use. e.) Less than significant impact. The project site is identified as containing lands classified as Prime Farmland and Urban and Built-up by the California Department of Conservation’s FMMP. Surrounding areas are classified as Urban and Built-up Land and Prime Farmland. As described above, the GPEIR includes a programmatic analysis of agricultural land being converted to non-agricultural uses. It also includes a programmatic analysis of “other changes in the environment, which due to their location, or nature, could result in the conversion of farmlands of concern under CEQA to non-agricultural use.” The GPEIR recognizes that re-designation of land by the General Plan land use map “could result in incompatible land uses next to farm uses or ranches, creating circumstances that impair the productivity of agricultural operations, and could eventually lead farmers to take their land out of production” (GPEIR, page 4.2-15). The project site and land to the north, west and east are zoned for residential uses. Land located to the south, across Comanche Creek, is zoned Agriculture. Due to the close proximity of Agricultural-zoned land, the premature conversion of farmlands could potentially occur from the increase in residential dwellings developed on the project site. This close proximity may cause potential conflicts from incompatibility, causing restrictions on farming

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

operations, restrictions on pesticide usage, increase risk of theft and vandalism, complaints, introduction of pests, litter, and pets. Future development on the proposed parcels may include the construction of a single-family residence. Residential development would be subject to the County’s Agricultural Buffer Policy, Policy AG-P5.3 from the Butte County General Plan and Article 17 of the Zoning Ordinance, which requires buffers between existing agricultural land and new residential development by applying a 300-foot buffer. The proposed project identifies a 300-foot residential setback from the southern property line. Residential development would also be subject to the requirements of General Plan Policy AG-P5.3.2 which requires a setback between a new residence and an active existing orchard or vineyard that locates the residence as far away from the orchard or vineyard as practicable, provided it does not limit the density permitted by the residential zone, and in no case less than 25 feet. Pursuant to the requirements of Butte County Code §24-56.1 (Residential Setback from Orchards and Vineyards), the Department of Development Services in conjunction with the Agricultural Commissioner’s Office is recommending a residential dwelling setback from adjacent active orchard (APN 039-370-102) of 50 feet, or 25 feet with approved vegetation screen along the eastern property lines of Parcels 13-18 and from the northern property line of Parcel 11 Mitigation Measure: None Required.

4.3 Air Quality:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Conflict with or obstruct implementation of the applicable air quality plan? b. Violate any air quality standard or contribute substantially to an existing or projected air quality violation? c. Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is nonattainment under an applicable federal or state ambient air quality standard (including releasing emissions which exceed quantitative thresholds for ozone precursors)? d. Expose sensitive receptors to substantial pollutant concentrations? e. Create objectionable odors affecting a substantial number of people?

Setting: The proposed project is located within the Northern Sacramento Valley Air Basin (NSVAB). Summer conditions in the NSVAB are typically characterized by high temperatures and low humidity, with temperatures averaging from approximately 90 degrees Fahrenheit during the day and 50 degrees Fahrenheit at night. During the summer months, the prevailing winds are typically from the south. Winter conditions are characterized by occasional rainstorms interspersed with stagnant and sometimes foggy weather. The daytime average temperature is in the low 50soF and nighttime temperatures average in the upper 30soF. During winter, winds predominate from the south, but north winds frequently occur. Rainfall occurs mainly from late October to early May, with an average of 17.2 inches per year, but this amount can vary significantly each year. Dispersion of local pollutant emissions are predominately affected by the prevailing wind patterns and inversions that often occur in the NSVAB. Within the NSVAB, two types of inversions can occur. During the summer months, sinking air forms a “lid” over the region and confines pollution to a shallow layer near the ground, which can contribute to photochemical smog problems. During winter nights, air near the ground cools while the air aloft remains warm, which can cause poor dispersion of ground level pollutant emissions (Butte County General Plan EIR; BCAQMD, 2014).

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Current Ambient Air Quality

Federal and state standards have been established for six criteria pollutants, including ozone (O3), carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), particulates less than 10 microns and 2.5 microns in diameter (PM10 and PM2.5), and lead (Pb). The Butte County Air Quality Management District (BCAQMD) is the primary agency responsible for assuring that the federal and state ambient air quality standards are attained and maintained in Butte County. The BCAQMD operates a network of ambient air monitoring stations throughout Butte County. Depending on whether the standards for a particular criteria air pollutant has been met or exceeded, the local air basin is classified as being in “attainment” or “nonattainment.” Based on the most recent monitoring data, Butte County is a nonattainment area for both state and federal ozone standards, the state and federal PM2.5 standards, and the state PM10 standards. Butte County is in attainment for the state and federal standards for sulfur dioxide, nitrogen dioxide, and carbon monoxide (BCAQMD, 2014).

Table 4.3-1 Butte County - State and Federal Ambient Air Quality Attainment Status POLLUTANT STATE DESIGNATION FEDERAL DESIGNATION 1-hour ozone Nonattainment - 8-hour ozone Nonattainment Nonattainment Carbon monoxide Attainment Attainment Nitrogen Dioxide Attainment Attainment Sulfur Dioxide Attainment Attainment 24-Hour PM 10 Nonattainment Attainment 24-Hour PM 2.5 No Standard Nonattainment Annual PM 10 Attainment No Standard Annual PM 2.5 Nonattainment Attainment Source: Butte County AQMD, 2014

Air Quality Planning The California Clean Air Act requires air districts to prepare a plan for air quality improvement for criteria pollutants for which the District is in nonattainment. The BCAQMD’s Air Quality Attainment Plan was first adopted in 1991 and updated in 1994, 1997, 2000 and 2003. In 2006, the District collaborated with other air pollution control districts in the NSVAB to prepare a joint Air Quality Attainment Plan. That joint plan has been updated in 2006, 2009 and 2012 as the Northern Sacramento Valley Planning Area Triennial Air Quality Attainment Plan. The attainment plan is the basis for an air district’s functional strategy to meet federal and state ambient air quality standards. The BCAQMD, in its role of insuring projects are properly evaluated for consistency with ambient air quality standards and the Northern Sacramento Valley Planning Area Triennial Air Quality Attainment Plan, have prepared guidelines to assist applicants and lead agencies in evaluating potential air quality and greenhouse impacts that may occur with a proposed project. Established with these guidelines are screening criteria to determine whether or not additional modeling for criteria air pollutants is necessary for a project. The screening criteria listed in Table 4.3-2 were created using CalEEMod version 2013.2.2 for the given land use types. To determine whether or not a proposed project meets the screening criteria, the size and metric for the land use type (units or square footage) should be compared with that of the proposed project. If a project meets the applicable screening criteria, then further quantification of criteria air pollutants is not necessary, and it may be assumed that the project would have a less than significant impact for criteria air pollutants. If a project exceeds the size provided by the screening criteria for a given land use type then additional modeling and quantification of criteria air pollutants should be performed (BCAQMD, 2014).

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Table 4.3-2 Screening Criteria for Criteria Air Pollutants LAND USE TYPE MAXIMUM SCREENING LEVELS FOR PROJECTS Single Family Unit Residential 30 units Multi-Family (Low Rise) Residential 75 units Commercial 15,000 square feet Educational 24,000 square feet Industrial 59,000 square feet Recreational 5,500 square feet Retail 11,000 square feet Source: Butte County AQMD, CEQA Air Quality Handbook, 2014

Impact Discussion: a.) Less than significant impact. A project is deemed inconsistent with air quality plans if it would result in population and/or employment growth that exceeds growth estimates included in the applicable air quality plan, which, in turn, would generate emission not accounted for in the applicable air quality plan emissions budget. Therefore, proposed projects need to be evaluated to determine whether they would generate population and employment growth and, if so, whether that growth would exceed the growth rates included in the relevant air plans. The proposed project could result in minor population growth in the County with build-out of the resultant parcels. The proposed development density is consistent with the established zoning, and population growth to the area has already been anticipated for under Butte County General Plan 2030. Additionally, the total number of single-family residential units generated by the project is below the maximum screening criteria established in Table 4.3-2. Therefore, the project is not anticipated to cause significant impacts to regional air quality, or otherwise conflict with the basin’s air quality management plan, provided that best management practices for the control of fugitive dust during construction activities are employed. b.) Less than significant impact with mitigation incorporated. The proposed project has the potential to impact air quality primarily in two ways: (1) the project would generate mobile source emissions associated with future development on the resultant parcels, and (2) fugitive dust (particulate/PM10) and construction exhaust emissions would be generated during site preparation and the construction activities associated with proposed road improvements and future development on the resultant parcels. Mobile source emissions are produced from motor vehicles, and include tailpipe and evaporative emissions. Energy use associated with development may be caused by heating and cooling systems, lighting, applicant, water use and wastewater. No development is proposed with this project; however, future development of the resultant parcels has the potential to generate these direct and indirect emissions. Emissions generated during at build-out of the resultant parcels are not expected to be substantial, and would not significantly violate existing air quality standards, because only a limited amount development would occur over the project site. The limited amount of development to occur with the proposed project was compared to the screening criteria of Table 4.3-2, and deemed to have a less than significant impact to the environment. Construction-related emissions are generally created throughout the course of project implementation and parcel development, and would originate from construction equipment exhaust, employee vehicle exhaust, dust from grading the land, exposed soil eroded by wind, and ROGs from architectural coating and asphalt paving. Construction-related emissions would vary substantially depending on the level of activity, length of the construction period, specific construction operations, types of equipment, number of personnel, wind and precipitation conditions, and soil moisture content. Despite this variability in project site conditions, there are a number of feasible control measures that can be reasonably implemented to meaningfully reduce construction- related emissions to a less than significant level. These measures as well as other common air pollution control measures are recommended in Appendix C of BCAQMD’s CEQA Handbook (2014), and are to be implemented as Mitigation Measure #1, listed below. c.) Less than significant impact with mitigation incorporated. Based on the information provided in section b.), above, the proposed project would not result in the violation of any air quality standards or contribute substantially to an existing or projected air quality violation, except for potential fugitive dust emissions during construction activities.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Fugitive dust emissions generated during construction has the potential to contribute cumulatively to the region’s nonattainment of PM10 and PM2.5 emissions. Implementation of Mitigation Measure #1 would reduce potential cumulative fugitive dust emission impacts to a less than significant level. d.) Less than significant impact. Residences are located within ¼-mile of the project site. Construction activities would generate emissions of criteria pollutants, including suspended and inhalable particulate matter and equipment exhaust emissions. These emissions could expose nearby sensitive receptors to pollutants concentrations. Implementation of Mitigation Measure #1 would reduce impacts of construction-related fugitive dust emissions. Additionally, because impacts related to equipment exhaust emissions would not exceed the significance thresholds recommended by BCAPMD, and because construction activities of future residential development tend to be short in duration, impacts to sensitive receptors would be less than significant. e.) Less than significant impact. Future permitted uses on the resultant parcels would not create objectionable odors. However, future construction activities could include objectionable odors from tailpipe diesel emissions and from solvents in adhesives, paints, caulking materials, and new asphalt. Since odor impacts would be temporary and limited to the area adjacent to the construction operations, and because the project site is located in a rural area of the county, odors would not impact a substantial number of people for an extended period of time. Mitigation Measure #1 (Construction Air Emissions) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “The following best practice measures to reduce impacts to air quality shall be incorporated by the project applicant, subject property owners, or third-party contractors during construction activities on the project site. These measures are intended to reduce criteria air pollutants that may originate from the site during the course of land clearing and other construction operations. Diesel PM Exhaust from Construction Equipment and Commercial On-Road Vehicles Greater than 10,000 Pounds  All on- and off-road equipment shall not idle for more than five minutes. Signs shall be posted in the designated queuing areas and/or job sites to remind drivers and operators of the five-minute idling limit.  Idling, staging and queuing of diesel equipment within 1,000 feet of sensitive receptors is prohibited.  All construction equipment shall be maintained in proper tune according to the manufacturer’s specifications. Equipment must be checked by a certified mechanic and determined to be running in proper condition before the start of work.  Install diesel particulate filters or implement other CARB-verified diesel emission control strategies.  Shall not operate a diesel-fueled auxiliary power system (APS) to power a heater, air conditioner, or any ancillary equipment on that vehicle during sleeping or resting in a sleeper berth for greater than 5 minutes at any location when within 100 feet of a restricted areas.  To the extent feasible, truck trips shall be scheduled during non-peak hours to reduce peak hour emissions. Operational TAC Emissions  All mobile and stationary Toxic Air Contaminants (TACs) sources shall comply with applicable Airborne Toxic Control Measures (ATCMs) promulgated by the CARB throughout the life of the project (see http://www.arb.ca.gov/toxics/atcm/atcm.htm).  Stationary sources shall comply with applicable District rules and regulations. Fugitive Dust Construction activities can generate fugitive dust that can be a nuisance to local residents and businesses near a construction site. Dust complaints could result in a violation of the District’s “Nuisance” and “Fugitive Dust” Rules 200 and 205, respectively. The following is a list of measures that may be required throughout the duration of the construction activities:  Reduce the amount of the disturbed area where possible.  Use of water trucks or sprinkler systems in sufficient quantities to prevent airborne dust from leaving the site. An adequate water supply source must be identified. Increased watering frequency would be required whenever wind speeds exceed 15 mph. Reclaimed (non-potable) water should be used whenever possible.  All dirt stockpile areas should be sprayed daily as needed, covered, or a District approved alternative method will be used.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

 Permanent dust control measures identified in the approved project revegetation and landscape plans should be implemented as soon as possible following completion of any soil disturbing activities.  Exposed ground areas that will be reworked at dates greater than one month after initial grading should be sown with a fast-germinating non-invasive grass seed and watered until vegetation is established.  All disturbed soil areas not subject to re-vegetation should be stabilized using approved chemical soil binders, jute netting, or other methods approved in advance by the Butte County Air Quality Management District.  All roadways, driveways, sidewalks, etc. to be paved should be completed as soon as possible. In addition, building pads should be laid as soon as possible after grading unless seeding or soil binders are used.  Vehicle speed for all construction vehicles shall not exceed 15 mph on any unpaved surface at the construction site.  All trucks hauling dirt, sand, soil, or other loose materials are to be covered or should maintain at least two feet of freeboard (minimum vertical distance between top of load and top of trailer) in accordance with local regulations.  Install wheel washers where vehicles enter and exit unpaved roads onto streets, or wash off trucks and equipment leaving the site.  Sweep streets at the end of each day if visible soil material is carried onto adjacent paved roads. Water sweepers with reclaimed water should be used where feasible.  Post a sign in prominent location visible to the public with the telephone numbers of the contractor and the Butte County Air Quality Management District - (530) 332-9400 for any questions or concerns about dust from the project.” All fugitive dust mitigation measures required should be shown on grading and building plans. In addition, the contractor or builder should designate a person or persons to monitor the dust control program and to order increased watering, as necessary, to prevent transport of dust offsite. Their duties shall include holidays and weekend period when work may not be in progress. The name and telephone number of such persons shall be provided to the District prior to land use clearance for map recordation and finished grading of the area. Please note that violations of District Regulations are enforceable under the provisions of California Health and Safety Code Section 42400, which provides for civil or criminal penalties of up to $25,000 per violation. Plan Requirements: The note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. This note shall also be placed on all building and site development plans. Timing: Requirements of the condition shall be adhered to throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Building inspectors shall spot check and shall ensure compliance on-site. Butte County Air Pollution Control District inspectors shall respond to nuisance complaints.

4.4 Biological Resources:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service? b. Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, regulations or by the California Department of Fish and Game or U.S. Fish and Wildlife Service?

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

c. Have a substantial adverse effect on federally protected wetlands as defined by Section 404 or the Clean Water Act (including, but not limited to, marsh,

vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means)? d. Interfere substantially with the movement of any native resident or migratory fish and wildlife species or with established native resident or migratory

wildlife corridors, or impede the use of native wildlife nursery sites? e. Conflict with any local policies or ordinances protecting biological resources such as a tree

preservation policy ordinance? f. Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? Setting: The project site is located in the valley region, situated south of the City of Chico. The Butte County General Plan Figure COS-2, identifies this property as Urban and Agricultural Land. A previous orchard operation was removed and much of the project site is now disturbed vacant land. Plant species present within these vacant areas are ruderal annual species including milk thistle (Silybum marianum), Johnsongrass (Sorghum halepense), sunflower (Helianthus sp.), pokeberry (Phytolacca americana), and Brassica sp. Comanche Creek is found along the southern border of the project area, it is surrounded by a riparian corridor containing a canopy of valley oak (Quercus lobata), Oregon ash (Fraxinus latifolia), western sycamore (Platanus racemosa), Fremont cottonwood (Populus fremontii), and interior live oak (Quercus wislizeni). Commonly encountered sub-canopy species include black walnut (Juglans hindsii) and cherry plum (Prunus cerasifera). Ground cover species within the riparian corridor included Himalayan blackberry (Rubus armeniacus), English ivy (Hedera helix), California wild grape (Vitis californica), and Santa Barbara sedge (Carex barbarae). Additionally, blue elderberry (Sambucus nigra ssp. caerulea) was encountered within the riparian vegetation along Comanche Creek. Blue elderberry is the sole host plant for the federally threatened valley elderberry longhorn beetle. Urban and Agricultural Land Urban and agricultural lands generally provide areas of low value for wildlife, however, exceptions do occur. Rice fields can provide relatively high-value habitat for a variety of species especially migratory waterfowl and shorebirds. Rice fields are also used by the federally listed giant garter snake, which will use rice fields for foraging and cover during its active season. Riparian Woodland Riparian woodland habitats occur in the Central Valley and are generally associated with low velocity flows, flood plains and gentle topography. Riparian communities are disproportionately important as they make up a relatively small area within the landscape but support higher species diversity than other habitat types in California. They are structurally diverse and provide food, water, migration and dispersal corridors, and escape, nesting, and thermal cover for a wide variety of species including many special-status species. Dominant canopy species include cottonwood, western sycamore, and valley oak. Common sub-canopy species include box elder, Oregon ash, and white alder. Typical understory species include wild rose (Rosa californica), California grape, Himalayan blackberry, California blackberry (Rubus ursinus), blue elderberry, poison oak (Toxicodendron diversilobum), and various willow species (Salix spp.). Common herbaceous species include sedges, rushes, mugwort (Artemisia douglasiana), and stinging nettle (Urtica dioicia). A number of wildlife species can be found within riparian woodlands including black-tailed deer (Odocoileus hemionus columbianus), coyote (Canis latrans), American porcupine (Erethizon dorsatum), western fence lizard (Sceloporus occidentalis), southern alligator lizard (Elgaria multicarinata), Sierran treefrog (Psuedacris sierra), spotted towhee (Pipilo maculatus), red shouldered hawk (Buteo lineatus), Cooper’s hawk (Accipiter cooperii), and Bewick’s wren (Thryomanes bewickii). In addition to these species that permanently reside in riparian woodlands, a number of species of neotropical migrants are found in this community from spring through fall.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Biological Survey The purpose of the biological survey was to document any endangered, threatened, sensitive and rare species, and their critical habitats that occur in the biological survey area (BSA). Biological surveys were conducted on October 4, 2016 by NorthStar biologist Matt Rogers. There are no critical habitat designations within or adjacent to the project site. NorthStar conducted a general biological survey in the BSA to evaluate site conditions and the potential for special- status species occurrence within the project area. Species encountered during the survey are included as Appendix A. Information on potential special-status species occurrence was gathered from three primary references including the United States Fish and Wildlife Service (USFWS) Information for Planning and Conservation database, California Department of Fish and Wildlife’s (CDFW) California Natural Diversity Database (CNDDB) accessed via RareFind 5, and the California Native Plant Society’s (CNPS) Online Inventory of Rare and Endangered Plants v8-02. The results of the evaluation identified special-status species with potential to occur in the BSA, and/or special-status species that could be impacted outside of the BSA by project actions. A complete list of all sensitive natural communities and special-status species with a potential for occurrence at the project site is presented below. Recommendations to avoid or minimize impacts, and mitigation measures for special-status species and their habitats are incorporated into mitigation measures herein. Aquatic Habitat Riverine Comanche Creek Comanche Creek is present along the southern boundary of the project area. Comanche Creek is a low gradient stream originating approximately four miles east of the City of Chico at the Parrot-Phelan Diversion on Butte Creek. It conveys water to agricultural uses approximately west of the City of Chico, flow through the site is in an east to west direction. Historically, Comanche Creek was an intermittent creek, but since the construction of the Parrot-Phelan Diversion the creek holds water perennially. In addition to the agricultural conveyance, Comanche Creek also collects stormwater from the Chico urban area and moves it west of Chico. Comanche Creek within the project area has a well-developed riparian canopy containing valley oak, western sycamore, and Fremont cottonwood. Special-Status Species Many species of plants and animals within the State of California have low populations, limited distributions, or both. Such species may be considered “rare” and are vulnerable to extirpation as the state’s human population grows and the habitats these species occupy are converted to agricultural and urban uses. A sizable number of native species and animals have been formally designated as threatened or endangered under State and Federal endangered species legislation. Others have been designated as “Candidates” for such listing and the California Department of Fish and Wildlife (CDFW) have designated others as “Species of Special Concern”. The California Native Plant Society (CNPS) has developed its own lists of native plants considered rare, threatened or endangered. Collectively, these plants and animals are referred to as “special status species.” Various direct and indirect impacts to biological resources may result from the small amount of development enabled by the project, including the loss and/or alteration of existing undeveloped open space that may serve as habitat. Increased vehicle trips to and from the project site can result in wildlife mortality and disruption of movement patterns within and through the project vicinity. Disturbances such as predation by pets (e.g., cats and dogs) and human residents may also occur at the human/open space interface, while conversion of land from lower to higher density residential use can lead to a predominance of various urban-adapted wildlife species (e.g., coyotes, raccoons, ravens and blackbirds) that have been observed to displace more sensitive species. California Environmental Quality Act Guidelines Section 15065 requires a mandatory finding of significance for projects that have the potential to substantially degrade or reduce the habitat of a threatened or endangered species, and to fully disclose and mitigate impacts to special status resources. For the purposes of this Initial Study, the California Environmental Quality Act (Sections 21083 and 21087, Public Resources Code) defines mitigation as measure(s) that:  Avoids the impact altogether by not taking a certain action or parts of an action.  Minimizes impacts by limiting the degree or magnitude of the action and its implementation.  Rectifies the impact by repairing, rehabilitating, or restoring the impacted environment.  Reduces or eliminates the impact over time by preservation and maintenance operations during the life of the project.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

 Compensates for the impact by replacing or providing substitute resources or environments. To assess the potential for special-status botanical and wildlife species within and in the vicinity of the project site, NorthStar consulted special-status species lists from the U.S. Fish and Wildlife Services (USFWS), CDFW’s California Natural Diversity Database (CNDDB), and the California Native Plant Society (CNPS). Table 4.4-1 includes all the special-status species analyzed for their potential of occurrence within the BSA:

Table 4.4-1: Special-status species and habitats identified by USFWS, CDFW and CNPS as potentially occurring within the BSA. Status Common Name Associated Potential for Fed/State/ (Scientific Name) Habitats Occurrence CNPS SENSITIVE NATURAL COMMUNITIES Occurs near river mouths, oxbows, and other areas in the floodplain, and along margins of Coastal and Valley lakes and springs, where water is quiet and None: Not present within the _/SNC/_ Freshwater Marsh permanently flooded by freshwater. BSA Dominated by perennial, emergent monocots 4-5 meters tall. Moderate: Suitable riverine habitat is present within the BSA, but the riparian habitat Great Valley Cottonwood Perennial creeks and rivers in the Central _/SNC/_ present is more consistent Riparian Forest Valley. with Mixed Riparian Forest and Valley Oak Riparian Forest. A tall, dense, winter-deciduous, broadleafed riparian forest. The tree canopy is usually Great Valley Mixed Riparian fairly well closed and moderately to densely Known: Present within the _/SNC/_ Forest stocked with several species including Acer BSA. negundo, Juglans hindsii, Platanus racemosa, Populus fremontii, and Salix spp. Occurs on the deep alluvial soils of higher Great Valley Valley Oak floodplain terraces in association with river Known: Present within the _/SNC/_ Riparian Forest systems. Can also be found in other upland BSA. communities. Low: Very few depositional Pioneer riparian community found on areas along Comanche Creek Great Valley Willow Scrub _/SNC/_ depositional areas near the edge of as the creek through the area intermittent and perennial creeks and rivers. is fairly incised and channeled. Associated with low- to mid-elevation Northern Basalt Flow Vernal None: Does not occur within _/SNC/_ seasonally flooded depressions on Pool the BSA. impermeable soils. Seasonally flooded depressions on Northern Claypan Vernal None: Does not occur within _/SNC/_ impermeable soils with low microrelief and Pool the BSA. overall cover. Northern Hardpan Vernal Seasonally flooded depressions on None. Does not occur within /SNC/_ Pool impermeable soils or rock. the BSA Northern Volcanic Mud Flow Seasonally flooded depressions on None. Does not occur within /SNC/_ Vernal Pool impermeable soils or rock. the BSA

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

PLANTS None: Chaparral, cismontane Adobe Lily Chaparral, cismontane woodland, valley and woodland, and valley / /1B (Fritillaria pluriflora) foothill grassland. (Feb-Apr) grassland habitat is not present within the BSA. Adobe Navarretia Valley and foothill grasslands, vernal pools, None: No suitable vernal pool (Navarretia nigelliformis ssp. / /4.2 vernally mesic areas with clay soils. (April- habitat occurs within the nigelliformis) June) BSA.

Ahart’s Buckwheat Serpentinite soils, openings, and slopes in None: No suitable chaparral (Eriogonum umbellatum var. / /1B chaparral and cismontane woodland. (Jun- and serpentinite habitat ahartii) Sep) occurs within the BSA.

None: No suitable vernal pool Ahart’s Paronychia Cismontane woodland, valley and foothill / /1B habitat is present within the (Paronychia ahartii) grassland, and vernal pools. (Mar-Jun) BSA.

Bidwell’s Knotweed Thin, rocky volcanic soils in chaparral, None: No suitable rocky (Polygonum bidwelliae) / /4.3 cismontane woodlands, and foothill and volcanic soils are found valley grasslands. within the BSA.

Big-scale Balsam Root Cismontane woodlands and chaparral. Valley None: No suitable habitat is (Balsamorhiza macrolepis var. / /1B and Foothill grasslands. Sometimes present within the BSA. macrolepis) serpentinite. (Mar-June) None: No suitable chaparral, Brassy Bryum Chaparral openings, cismontane woodlands, cismontane woodland, or / /4.3 (Bryum chryseum) valley and foothill grasslands. grassland habitats are present within the BSA. None: No suitable marsh or Brazilian Watermeal Marshes and swamps (shallow / / 2 swamp like habitat is present (Wolffia brasiliensis) freshwater). (Apr-Dec) within the BSA. Lower montane coniferous forest, meadows None: No suitable montane Brownish Beaked-Rush and seeps, marshes and swamps, upper / / 2 coniferous forest present (Rhynchospora capitellata) montane coniferous forest (mesic), 455-2000 within the BSA. meters. (Jul-Aug) Chaparral, cismontane woodland, lower Butte County Calycadenia None: No suitable mesic / /4.2 montane coniferous forest, meadows and (Calycadenia oppositifolia) habitat present in the BSA. seeps, valley and foothill grassland. (Apr-Jul) None: No suitable chaparral Butte County Checkerbloom Chaparral and cismontane woodland. (Apr- / /1B or cismontane woodland (Sidalcea robusta) Jun) habitat present in the BSA. Chaparral, cismontane woodland, openings in None: No suitable chaparral Butte County Fritillary / /3 lower montane coniferous forests, sometimes or cismontane woodland (Fritillaria eastwoodiae) serpentinite. (Mar-Jun) present within the BSA. None: No suitable vernal pool Butte County Golden Clover Valley and foothill grassland, vernal pools. / /1B habitat present within the (Trifolium jokerstii) (Mar-May) BSA. Butte County Meadowfoam None: No suitable vernal pool Valley and foothill grassland, vernal pools. (Limnanthes floccosa ssp. FE/SE/1B habitat present within the (Mar-May) californica) BSA. None: No suitable chaparral Butte County Morning-glory Chaparral and rocky lower montane or lower montane coniferous (Calystegia atriplicifolia ssp. / /4 coniferous forest, sometimes roadsides. (May- forest habitat present within buttensis) Jul) the BSA.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Bogs and fens, lower montane coniferous None: No suitable mesic California Beaked-rush / /1B forest, meadows and seeps, and marshes and habitat is present within the (Rhynchospora californica) swamps. (May-Jul) BSA. Chaparral, coastal scrub, Mojavean desert Low: No suitable chaparral, California Satintail scrub, meadows and seeps (often alkali), and or scrub habitat is present in / /2B (Imperata brevifolia) mesic riparian scrub, 0-500 meters. (Sep- the BSA. Riparian habitat May) present. None: No suitable grassland Depauperate Milk-vetch Valley grassland, foothill woodland (March- / /4.3 habitat present within the (Astragalus pauperculus) June) BSA.

None: No suitable chaparral Dissected-leaved Toothwort Chaparral and lower montane coniferous or lower montane coniferous (Cardamine pachystigma var. / /1B forests, usually serpentinite and rocky. (Feb- forest habitat present within dissectifolia) May) the BSA. Ferris’s Milk-vetch Meadows and seeps, valley and foothill None: Known only from six / /1B (Astralagus tener var. ferrisiae) grassland. (Apr-May) extant occurrences. None: No suitable Flagella-like Atractylocarpus / / 2 Cismontane woodland, 100-500 meters. cismontane woodland habitat (Campylopodiella stenocarpa) is present within the BSA. None: No suitable vernal pool Greene’s Tuctoria FE/ /1B Vernal pools. (May-Jul/Sept) habitat is present within the (Tuctoria greenei) BSA. None: No suitable deep Hairy Orcutt Grass FE/SE/1B Deep vernal pools. (May-Sept) vernal pool habitat is present (Orcuttia pilosa) within the BSA. None: No suitable vernal pool Hogwallow starfish Shallow vernal pools, mesic valley and / /4.2 or mesic grassland habitat (Hesperevax caulescens) foothill grasslands. (March-June) present within the BSA. None: No suitable vernal pool Hoover’s Spurge FT/ /1B Vernal pools. (Jul-Sep/Oct) habitat is present within the (Chamaesyce hooveri) BSA. Humboldt Lily None: No suitable chaparral Chaparral openings and yellow pine forest. (Lilium humboldtii ssp. / /4.2 habitat is present within the (May-July) humboldtii) BSA. None: No suitable mesic Marsh Claytonia Meadows, seeps, marshes, swamps, upper / /4.3 coniferous forest habitat is (Claytonia palustris) montane coniferous forests. (May-Oct) present within the BSA. None: No suitable slow Mexican Mosquito Fern Marshes, swamps, ponds, and slow moving / /4.2 moving water present within (Azolla microphylla) water. (Aug) the BSA. None: No suitable vernal pool Parry’s Rough Tarplant Valley and foothill grasslands, vernal pools, / /4.2 habitat present within the (Centromadia parryi ssp. rudis) vernal seeps. (May-Oct) BSA. None: No suitable chaparral, Pink Creamsacs Chaparral, cismontane woodland, meadows cismontane woodland, (Castilleja rubicundula ssp. / /1B and seeps, valley and foothill grassland meadow, seep, or grassland rubicundula) (serpentine). (Apr-Jun) habitat present within the BSA. Chenopod scrub, cismontane woodland, None: No suitable alkaline Recurved Larkspur / /1B valley and foothill grassland (alkaline). (Mar- habitat present within the (Delphinium recurvatum) Jun) BSA.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Chaparral, cismontane woodland, meadows Red Bluff Dwarf Rush None: No suitable vernal pool and seeps, valley and foothill grassland and (Juncus leiospermus var. / /1B habitat present within the vernal pools/vernally mesic habitats. (Mar- leiospermus) BSA. May)

None: No suitable grassland Cismontane woodland, valley and foothill habitat present within the Round-leaved Filarree / /1B (California macrophylla) grassland (clay). (Mar-May) BSA.

None: No suitable Chaparral, cismontane woodlands, lower Shield-bracted Monkey cismontane woodland, lower montane coniferous forests, valley and Flower / /4.3 montane coniferous forest, or foothill grasslands, serpentinite seeps. (Feb- (Mimulus glaucescens) grassland habitat is present Sept) within the BSA.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 Cismontane woodland, lower montane Low: Riparian forest present Silky Cryptantha coniferous forest, riparian forest and however, no suitable gravelly / /1B (Cryptantha crinita) woodland, gravelly streambeds in valley and streambed is present within foothill grassland. (Apr-May) the BSA. Slender-leaved Pondweed Marshes and swamps (assorted shallow Low: Shallow freshwater (Stuckenia filiformis ssp. / /2 freshwater). (May-July) present within the BSA alpina) None: No suitable vernal pool Tehama Navarretia Mesic valley and foothill grasslands, vernal / /4.3 habitat present within the (Navarretia heterandra) pools. (April-June) BSA. None: No suitable grassland Veiny Monardella Cismontane woodlands. Valley and foothill / /1B habitat with heavy clay soils (Monardella venosa) grasslands in heavy clay soils. (May-July) present within the BSA. None: No suitable marsh or Watershield / /2 Freshwater marshes and swamps. (Jun-Sep) swamp habitat present within (Brasenia schreberi) the BSA. White-stemmed Clarkia None: No suitable chaparral Chaparral and cismontane woodland (Clarkia gracilis ssp. / /1B habitat present within the (sometimes serpentine). (May-Jul) albicaulis) BSA. Woolly meadowfoam None: No suitable vernal pool Edge of vernal pools at elevations of 375 to (Limnanthes floccosa / /4.2 habitat present within the 400 meters. (Mar-Apr) ssp. floccosa) BSA. Woolly Rose-mallow None: No suitable marsh or (Hibiscus lasiocarpos var. / /1B Marshes and swamps (freshwater). (Jun-Sep) swamp habitat present within occidentalis) the BSA. INVERTEBRATES Antioch Dunes Anthicid None: No suitable sandy Beetle / / Interior sand dunes and sand bars. habitat present within the (Anthicus antiochensis) BSA. None: No suitable vernal pool California Linderiella Vernal pools, swales, and ephemeral / / habitat present within the (Linderiella occidentalis) freshwater habitat. BSA. None: No suitable vernal pool Conservancy Fairy Shrimp Moderately turbid, deep, cool-water vernal FE/ / habitat present within the (Branchinecta conservatio) pool BSA. Interior sand dunes and sand bars; has also been found in dredge spoil heaps. Known None: No suitable sand dune Sacramento Anthicid Beetle occurances along the Sacramento and San / / or sand bar habitat present (Anthicus sacramento) Joaquin rivers from Shasta to San Joaquin within the BSA. counties and at one site along the Feather River at Nicolaus. Valley Elderberry Longhorn High: Blue elderberry shrubs Beetle Blue elderberry shrubs usually associated FT/ / found within the riparian area (Desmocerus californicus with riparian areas. adjacent to Comanche Creek. dimorphus) None: No suitable vernal pool Vernal Pool Fairy Shrimp Vernal pools, swales, and ephemeral FT/ / habitat is present within the (Branchinecta lynchi) freshwater habitat. BSA. None: No suitable vernal pool Vernal Pool Tadpole Shrimp Vernal pools, swales, and ephemeral FE/ / habitat present within the (Lepidurus packardi) freshwater habitat. BSA.

REPTILES AND AMPHIBIANS California Red-legged Frog Inhabits quiet pools of streams, marshes, and None: Presumed extirpated FT/ / (Rana draytonii) occasionally ponds. from the valley.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Occurs in openings in valley foothill Low: Riparian forest present Coast Horned Lizard hardwood, coniferous, riparian habitats, pine- within the BSA, however /SSC/ (Phrynosoma blainvilli) cypress, juniper, and annual grassland habitats nearest occurrence is over 15 with sandy soils and presence of ants. miles from the BSA. Low: Shallow stream present Foothill Yellow-legged Frog Partly-shaded, shallow streams and riffles /SSC/ within the BSA, but substrate (Rana boylii) with cobble-sized substrate for egg-laying. is not cobble. Low: Little to no emergent vegetation present within the portion of Comanche Creek within the BSA for foraging and escape cover. Few Agricultural wetlands and other wetlands such basking locations as the Giant Garter Snake as irrigation and drainage canals, low gradient FT/ST/ riparian canopy is very well (Thamnophis gigas) streams, marshes, ponds, sloughs, small lakes, developed providing an and their associated uplands. abundance of shade. Additionally, the riparian habitat provides suitable habitat for a variety of predators. Northwestern Pond Turtle Associated with permanent ponds, lakes, Moderate: Permanent water is (Actinemys marmorata) /CSC/ streams, and irrigation ditches or permanent present within the BSA. marmorata) pools along intermittent streams. None: No suitable vernal Western Spadefoot Grassland and woodland and vernal pools _/CSC/_ pools for breeding present (Spea hammondii) without aquatic predators for breeding. within the BSA.

FISH None: No suitable riverine habitat present within the Central Valley Spring-Run BSA. Fish screen at Parrot- Chinook Salmon FT/ST/ Sacramento River and tributaries. Phalen Diversion excludes (Oncorhynchus tshawytscha) juvenile salmonids from Comanche Creek. None: No suitable riverine habitat present within the Central Valley Steelhead Sacramento and San Joaquin Rivers and their BSA. Fish screen at Parrot- (Oncorhynchus mykiss) FT/ / tributaries. Phelan excludes steelhead from Butte Creek entering Commanche Creek. None: No suitable estuary Delta Smelt habitat within the BSA. Not FT/ST/ Sacramento-San Joaquin Estuary (Hypomesus transpacificus) known to occur that far north on the Sacramento River

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

MAMMALS None: No suitable grassland American Badger Grasslands, savannahs, and mountain /SSC/_ habitat present within the (Taxidae taxus) meadows with friable soils. BSA. Low: Marginal roosting Pallid Bat Arid and semi-arid habitats; roosts in rock habitat provided by /SSC/ (Antrozous pallidus) crevices, caves, and mine shafts. cottonwoods along Comanche Creek. Common species of low elevations in Low: No suitable roosting Western Mastiff Bat California. Crevices in steep cliff faces or /SSC/ habitat present within the (Eumops perotis californicus) in the roof eaves of buildings of two or BSA, may forage in the area. more stories (needs vertical faces to take Roosting habitat includesflight). forest and broadleaf woodlands from sea level to coniferous forest. Moderate: Suitable riparian Western Red Bat Feeds over grasslands, shrublands, open /SSC/ roosting habitat present along (Lasiurus blossevillii) woodlands, and croplands. Known to occur Comanche Creek. from Shasta County to the Mexican border – often in riparian habitats. BIRDS Low: Sub-marginal habitat present. No large nest Bald Eagle Lakes, rivers, estuaries, reservoirs and some /SE/ structures were observed (Haliaeetus leucocephalus) coastal habitats. during biological surveys of the BSA. None: No suitable steep Bank Swallow Nests in steep riverbank cliffs, gravel pits, and /ST/ nesting habitat present within (Riparia riparia) highway cuts. the BSA. Nests in burrows in the ground, often in old None: No suitable burrow Burrowing Owl /SSC/ ground squirrel burrows or badger, within habitat is present within the (Athene cunicularia) open dry grassland and desert habitat. BSA. Yearlong resident of saline, brackish, and California Black Rail fresh emergent wetlands in the San Francisco None: No suitable marsh (Laterallus /ST/ Bay Area, Sacramento-San Joaquin Delta, habitat present within the jamaicensis coastal Southern California, the Salton Sea BSA. coturniculus) and lower Colorado River area. Low: Riparian habitat present Least Bell’s Vireo within the BSA. Closest FE/SE/ Riparian forests, woodlands, scrubs. (Vireo bellii pusillus) recent occurrence in the Yolo Bypass near Davis California. Open habitats with sparse shrubs and trees, Low: Marginally suitable Loggerhead Shrike MBTA/ other suitable perches, bare ground, and low habitat present within the (Lanius ludovicianus) SSC/ or sparse herbaceous cover BSA. Low: Marginal nesting Osprey MBTA/ Wetland, open water. habitat present within the (Pandion haliaetus) WL/ BSA. Woodland, forest and costal habitats Peregrine Falcon including riparian and wetland areas. None: No suitable cliff or / / (Falco peregrinus anatum) Requires bodies of water in open areas with canyon habitat near the BSA. cliffs and canyons nearby. Nests in isolated trees or riparian woodlands Moderate: Potentially suitable Swainson’s Hawk MBTA/ST adjacent to suitable foraging habitat including nesting trees occur within the (Buteo swainsoni) / grasslands or suitable grain or alfalfa fields, BSA. or livestock pastures.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Nests in dense blackberry, cattail, tules, Tri-colored Blackbird willow, or wild rose within emergent Low: Marginal habitat /SSC/ (Agelaius tricolor) wetlands throughout the Central valley and present within the BSA. foothills surrounding the valley. Western Yellow-billed Low: Riparian habitat within Cuckoo Structured dense riparian forest, generally FT/SE/ the BSA is marginally (Coccyzus americanus willows. suitable for this species. occidentalis) Low: Potentially suitable nesting habitat present within Yellow Warbler Very partial to riparian woodlands of the the BSA however, the species /SSC/ (Setophaga petechia) lowlands and foothill canyons. is nearly extirpated as a breeder from the Central Valley. Known: Species protected by Nest and forage in a variety of habitats the MBTA were observed Migratory Birds and Raptors MBTA including hardwood woodlands, coniferous during the biological survey forests, meadows, grasslands and riparian. of the BSA. CODE Designations SSC=CDFW Species of Special Concern FE=Federally-listed Endangered FP=CDFW Fully Protected Species FT=Federally-listed Threatened SNC=CDFW Sensitive Natural Community FC=Federal Candidate Species WL=CDFW Watch List MTBA=protected by the Federal Migratory Bird Treaty Act CNPS 1A=Plants presumed extinct in California SE=State-listed Endangered CNPS 1B= Rare or Endangered in California or elsewhere ST=State-listed Threatened CNPS 2=Rare or Endangered in California, common elsewhere CNPS 4=Plants of limited distribution *Potential for occurrence: for plants it is considered the potential to occur during the survey period; for birds and bats it is considered the potential to breed, forage, roost, over-winter, or stop-over in the project area during migration. Any bird or bat species could fly over the project area, but this is not considered a potential for occurrence. The categories for the potential for occurrence include: None: The species or natural community is known not to occur, and has no potential to occur in the project area based on sufficient surveys, the lack of suitable habitat, and/or the project area is well outside of the known distribution of the species. Low: Potential habitat in the project area is marginal, but the species is known to occur in the vicinity of the project area; or suitable habitat is present, but the species is not known to occur in the vicinity of the project area. Moderate: Suitable habitat is present in the project area and the species is known to occur in the vicinity of the project area. High: Habitat in the project area is highly suitable for the species and there are reliable records close to the project area, but the species was not observed. Known: Species was detected in the project area or a recent reliable record exists for the project area. The following special-status species were determined to have at least a moderate potential of occurrence within the BSA. Figure 3 depicts all the special-status species occurrences within a 5-mile radius of the project site. Sensitive Natural Communities Sensitive natural communities are important, as their degradation and destruction may threaten the community type and the associated populations of dependent plants and wildlife species. The designated sensitive natural communities found within the BSA include Great Valley Mixed Riparian Forest and Valley Oak Riparian Forest. Both of these sensitive natural communities are found adjacent to Comanche Creek. Great Valley Cottonwood Riparian Forests would have moderate potential to occur within the BSA as suitable geomorphological characteristics are present to support the species found in this habitat type. Riparian Riparian communities are among the most important habitats for wildlife in California because of their high floristic and structural diversity, food abundance, and water availability. Butte County Code §24-76 et seq. (Riparian Areas) This article establishes standards for riparian areas to: A. Reduce the risk to property owners and the public from erosion and flooding; B. Protect and enhance the chemical, physical, and biological integrity of water resources in the county; C. Minimize pollutants entering water bodies from urban and stormwater runoff, and D. Preserve riparian vegetation and protect wildlife habitat and wildlife corridors along natural drainage way.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

24-77-Applicability A. The standards in this article apply to all riparian areas within the county, in addition to the permitting requirements set forth under Article II, Zoning Districts, Land Uses, and Development Standards. As shown in Figure 24-77-1 (Riparian Areas), riparian areas are defined as areas between the banks and fifty (50) feet in width measured from the top bank of any intermittent or perennial stream or river landward. Excluded from this definition are stock ponds and other stock watering facilities, culverted sections of creeks, and engineered systems developed by a public agency for collection of storm or flood waters, or systems other than natural creeks designed to deliver irrigation or water supplies. 24-78-Use Regulations A. Permitted Activities. The following activities are permitted as-of-right in riparian areas, subject to applicable performance standards below: 1. Livestock grazing and agricultural practices in the Agriculture, Foothill Residential, Foothill Country Residential, Rural Residential, Rural Country Residential, Timber Mountain, and Timber Production zones; 2. Native landscaping; 3. Figure 24-77-1 Riparian Areas

4. Fencing that does not interfere with the flow of flood waters or wildlife migration corridors, consistent with Article III, Division 3 (Walls and Fences); 5. Roads used primarily for the maintenance of a property; 6. Utilities, including the installation, operation and maintenance of water pumps; 7. Storm drains into riparian areas and creeks; 8. Trails and passive recreational activities not involving the establishment of any structures; 9. Construction and maintenance of County-owned culverts, rip-rap, and other drainage facilities; and 10. Construction and maintenance of County-owned bridges.

B. Conditionally Permitted Uses 1. Uses, structures, and activities permitted in the applicable zone are permitted within riparian areas only with approval of a Minor Use Permit. 2. To approve a Minor Use Permit for riparian area development, the Zoning Administrator shall make all of the following findings in addition to the findings in Article V, Division 5 (Conditional Use and Minor Use Permits): i. The proposed use, structure, or encroachment cannot be feasibly located outside the riparian area because such location would have a more adverse effect on the stream environment. ii. Measures are included that provide adequate protection of wildlife habitat, water quality and in-stream habitat, and capacity for flood management. 24-79-Performance Standards A. Construction. Construction is prohibited in riparian areas unless the necessary permits have been obtained from other responsible governmental agencies and plans have been approved by the Director of Public Works and the Zoning Administrator. B. Grading or Alterations to Riparian Vegetation. Grading, alteration of the natural contours of the land, or cutting, or alteration of natural vegetation that protects a riparian habitat is prohibited within riparian areas except when such action is:

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

1. Necessary to protect public health and safety 2. Associated with an approved creek restoration and enhancement project intended to improve the health and environmental integrity of the waterway. 3. Associated with an approved conditional use permit, minor use permit, tentative parcel or subdivision map, or mining permit. C. Streambed Alteration. Filling, grading, excavating, or obstructing streambeds in prohibited except in the following circumstances: 1. Placement of County-approved storm drain and irrigation outflow structures shall be designed so as to eliminate or minimize increases in the rate and amount of storm or irrigation water discharge; 2. Placement of public and non-public utility lines; 3. Construction of bridges and their connecting roadways; 4. Maintenance activities necessary to protect public health and safety; and 5. Creek restoration and improvement projects. 6. Development associated with an approved conditional use permit, minor use permit, tentative parcel or subdivision map, or mining permit. 24-80-Coordination with other regulatory agencies. All required permits from the California Department of Fish and Wildlife, the U.S. Army Corps of Engineers, the California State Water Resources Control Board, the Central Valley Flood Protection Board, or other applicable agencies, including any permit required under an approved Habitat Conservation Plan, shall be obtained prior to, concurrently with, or as a condition of, the approval of any County permits for development within riparian area. Evidence of approval or pending approval of any such permit shall be submitted to the County, including all appropriate supporting materials, environmental documentation, and studies. Special-Status Botanical Species occurring in the BSA No special-status plant species were determined to have suitable habitat within the assessment area. Many of the special- status plant species in the region are associated with habitat or soil types that do not occur within the BSA. Habitats that are absent from the BSA that generally support special-status plant species in the area include vernal pools, cis-montane woodlands, grasslands, serpentine soils, and alkaline soils. Special-status plant species considered for occurrence within the BSA are listed in Table 1. Endangered, Threatened and Special Status Wildlife The habitat evaluation and general biological surveys were conducted on October 4, 2016 by NorthStar biologist Matt Rogers. The following special-status wildlife species were determined to have at least a moderate potential of occurrence within the BSA: valley elderberry longhorn beetle, northwestern pond turtle, western red bat, Swainson’s hawk, and a wide variety of migratory birds and raptors protected by the Migratory Bird Treaty Act (MBTA). Invertebrates Valley Elderberry Longhorn Beetle The valley elderberry longhorn beetle (VELB) (Desmocerus californicus dimorphus) is listed as Threatened under the Federal ESA and critical habitat has been designated by the USFWS. The beetle is endemic to riparian systems along the margins of rivers and streams, and in adjacent grassy savannas in California’s Central Valley. The VELB occurs in the Central Valley of California below 3,000 feet. It is distributed primarily within riparian habitats from Shasta County to Kern County. Valley elderberry longhorn beetle feed and reproduce exclusively on two species of elderberry, blue elderberry (Sambucus nigra) and red elderberry (S. racemosa). The adult female beetles deposit eggs in the bark crevices of living plants. Larvae bore into the pith (plant tissue in the center of the stem) of larger elderberry stems upon hatching, where most the animal’s life-span occurs. Following pupation in the spring, the adult beetle emerges, creating a hole in the bark of the stem or branch. Adults feed on foliage and are present from March through early June. Because the adult stage is short lived, survey techniques focus on the presence of emergence holes for evidence of VELB. Emergence holes have been observed in shoots or branches with diameters as small as 0.5 inches (13 mm) but are more common in older, larger branches. Besides exhibiting a preference for “stressed” elderberry shrubs, VELB prefer shrubs with stems of a certain size class. Exit holes have been found more frequently in trunks or branches that are 5 to 20 cm (2-8 in) in diameter, or at least 1.0 inch or greater at ground height (USFWS 1999) and less than one meter off the ground (Collinge et al. 2001). Research also shows that exit holes more consistently occur in clusters or stands of elderberry shrubs surrounded by associate riparian vegetation, rather than in isolated shrubs (Collinge et al. 2001). Exit holes are circular to slightly oval and are usually 7-10 mm in diameter. VELB are the only insect species known to inhabit live elderberry shrubs and/or make exit holes of a similar size and shape in the Central Valley (Barr 1991).

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

The riparian corridor present adjacent to Comanche Creek contains blue elderberry, the host plant for valley elderberry longhorn beetle. The blue elderberry shrubs present on the site contain many stems of a preferable size class for the species. Due to the presence of 23 blue elderberry shrubs containing large diameter stems there is a high potential for occurrence of valley elderberry longhorn beetle within the BSA. Figure 4 depicts the location of all 23 blue elderberry shrubs relative to the parcels of the TSM. Reptiles and Amphibians

Northwestern Pond Turtle The northwestern pond turtle (Actinemys marmorata) can be found throughout California and is the only abundant native turtle in California. They are associated with permanent or nearly permanent water in a wide variety of habitats at elevations ranging from near sea level to 4,700 feet. They require basking sites including partially submerged logs, rocks, mats of floating vegetation, or open mud banks. The northwestern pond turtle hibernates in colder areas underwater on muddy bottoms. Nesting sites are typically constructed along the banks of permanent water in soils at least 10 cm deep and must have high internal humidity for eggs to develop and hatch (Jennings and Hayes 1994). Comanche Creek is a source of permanent water that may provide suitable aquatic habitat for the species. Additionally, upland habitat surrounding the creek may be suitable for nesting. The nearest occurrence for the species is approximately 1.8 miles to the east adjacent to Comanche Creek. Due to the presence of suitable aquatic and nesting habitat within the BSA and a known occurrence within two miles, there is a moderate potential for northwestern pond turtle to occur within the BSA. Mammals

Western Red Bat The western red bat (Lasiurus blossevillii) is a California Species of Special Concern, found from Shasta County to the Mexican border, west of the Sierra Nevada/Cascade crest and deserts. Winter range includes western lowlands and coastal habitats south of San Francisco. The western red bat roosts primarily in trees within forests and woodlands in edge habitats from sea level to mixed conifer forests (Williams and Findley 1979). However, the western red bat may have an association with riparian habitats with dense stands of cottonwood and sycamore, and orchards (Bolster 1998). Family groups are known to roost together, forming nursing colonies. They forage in open areas and feed on a variety of insects including moths, crickets, beetles, and cicadas (Shump and Shump 1982). Migrations typically occur in the spring from March to May and in the autumn from September to October. The western red bat has been seen at temperatures as low as 44ºF, however, in these cold climates the bat spends winter in hibernation (LaVal and LaVal 1979). The riparian habitat present along Comanche Creek provides potentially suitable roosting habitat for this species as they roost primarily in tree foliage. Additionally, the open vacant portions of the project area provide suitable foraging habitat. Due to the presence of suitable roosting habitat along Comanche Creek and suitable foraging habitat within the BSA, there is a moderate potential for western red bat to occur within the BSA. Birds

Swainson’s Hawk The Swainson’s hawk (Buteo swansoni) is listed as Threatened under the California Endangered Species Act (CESA). It is a long-distance migrant with nesting grounds in western North America. Swainson’s hawks arrive in the Central Valley between March and early April to establish breeding territories. Breeding occurs from late March to late August, peaking in late May through July (Fitzner 1980). Swainson’s hawks nest in isolated trees, small groves, or large woodlands, adjacent to open grasslands or agricultural fields. This species typically nests near riparian areas; however, it has been known to nest in urban areas as well. Nest locations are usually in close proximity to suitable foraging habitats, which include grasslands, irrigated pastures, alfalfa and other hay crops, and low-growing row crops. Swainson’s hawks primarily prey upon small rodents such as ground squirrels (Spermophilis spp.), pocket gophers (Thomomys spp.), voles (Microtus spp.), but insects, reptiles, and birds may be consumed as well (Snyder and Wiley 1976; Fitzner 1980; Estep 1989). Swainson’s hawks leave their breeding grounds to return to their wintering grounds in late August or early September (Bloom and DeWater 1994). The largest threats to Swainson’s hawks’ are loss of habitat and secondary poisoning from insecticides on their wintering grounds (Woodbridge et al. 1995a).

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

The mature riparian corridor present along Comanche Creek provides suitable nesting habitat for Swainson’s hawk. Additionally, large trees adjacent to and within the vicinity of the BSA provide suitable nesting habitat for the species. Due to the presence of suitable nesting habitat within the BSA, there is moderate potential for Swainson’s hawks to occur within the BSA. Migratory Birds and Raptors Migratory birds are protected in varying degrees under California Fish and Game Code, Section 3503.5, the MBTA, and CEQA. The project site currently provides suitable nesting and/or foraging habitat for a variety of these species that may nest on the ground, in low vegetation, and within riparian areas present within the BSA. Species protected by the MBTA are known to occur within the BSA as they were observed on the site during biological surveys conducted in October of 2016. Impact Discussion: a.) Less than significant impact with mitigations incorporated. The proposed project site contains habitats that have the potential to support special-status species by the CDFW and USFWS. Future development and construction activities on the project site may cause direct or indirect significant impacts to these special- status species, or result in modification of habitat that is known to support these species. Implementation of mitigation measures listed below will reduce the potential impacts to less than significant. The establishment of an approximate 150’ Agriculture buffer area adjacent to Comanche Creek will restrict development on the resultant parcels abutting Comanche Creek. This buffer is discussed in Section 4.2 Agricultural Resources. This buffer restricts construction of primary residences within 150 feet of the southern boundary of the property line, but allows for secondary structures to be constructed within the buffer. The buffer area with its restrictions will be delineated on the final map. Necessary actions for protection of special status species, in addition to the protection of riparian habitat, are outlined as follows: To protect the riparian habitat and special-status species present along Comanche Creek a 50 foot building setback from the top of the bank or outer edge of the riparian vegetation, whichever is greater, per Butte County Code §24- 76 to 24-80 et seq, will be depicted on the Subdivision Map or an additional map sheet. Relative to VELB, to avoid all impacts to the species construction activities cannot take place within 20 feet of any blue elderberry shrubs. Elderberry shrubs are located adjacent to Parcels 6, 7, and 9-14 these locations will be clearly identified on the Tentative Subdivision Map and construction plans. Further details are provided in Mitigation Measure #2 and #3, and would reduce impacts to VELB to less than significant levels. Additionally, the establishment of the 50-foot building setback from the top of the bank or edge of the riparian vegetation, whichever is greater, would ensure impacts to VELB would be less than significant. If a northwestern pond turtle is observed in the project area during construction activities, the contractor will temporarily halt construction until the turtle has moved itself to a safe location outside of the construction limits. If construction is to occur during the nesting season (late June-July), a pre-construction survey will be conducted by a qualified biologist to locate any pond turtles or their nests. Further details are provided in Mitigation Measure #4, and would reduce impacts to northwestern pond turtle to less than significant. Regarding western red bat, prior to the start of construction, a survey for roosting bats or maternity roosts shall be performed by a qualified biologist. Details are provided in Mitigation Measure #5, and would reduce impacts to western red bat to less than significant. Nesting birds are protected under the MBTA (16 USC 703) and the CFGC (3503). Any ground disturbance or vegetation removal within the BSA should be conducted during the non-breeding season (September 1- February 28). If construction activities occur during the avian breeding season (March 1 – August 31) then a migratory bird and raptor survey will be conducted by a qualified biologist to identify any active nests (i.e. nests that contain eggs or hatchlings). Further details are provided in Mitigation Measure #6, and would reduce impacts to migratory birds and raptors protected by the MTBA and CFGC to less than significant levels. Relative to Swainson’s hawk, any ground disturbance or vegetation removal within should be conducted during the non-breeding season (September 16 through February 28). If construction activities occur during the breeding season (March 1-September 15) then a pre-construction raptor survey will be conducted by a qualified biologist to identify any active Swainson’s hawk nests within and in the vicinity of the BSA. Further details of Swainson’s hawk mitigation are provided in Mitigation Measure #7, and would reduce potential impacts to Swainson’s hawk to a less than significant level.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 b.) Less than significant impact with mitigation incorporated. The project site contains riparian habitat adjacent to Comanche Creek. This riparian habitat is well developed with large canopy species including valley oak, western sycamore, Fremont cottonwood, and Oregon ash. Adherence to the Butte County Code §24-76 to 24-80 et seq. regarding standards for development within riparian areas and establishing a 50-foot building setback from the top of the bank or out edge of the riparian vegetation, whichever is greater, would ensure that impacts to the riparian areas adjacent to Comanche Creek would be less than significant. Details of the setback are provided in Mitigation Measure #8. Additionally, the riparian habitat surrounding Comanche Creek would likely be considered jurisdictional by CDFW under CFGC Section 1602. Avoidance of these areas will also ensure that the project will not result in the conversion of oak woodlands as provided by Public Resources Code Section 21083.4 c.) Less than significant impact with mitigation incorporated. The project site contains state and federally protected waters of the United States, consisting of Comanche Creek. Development on the project site that requires grading, trenching and the placement of fill in areas where jurisdictional wetlands and other waters of the United States may cause significant impacts to wetland features. Implementation of Mitigation Measure #7 would address potential impacts to jurisdictional features; reducing impacts to a less than significant level. d.) Less than significant impact. Wildlife movement corridors are routes frequently utilized by wildlife that provide shelter and sufficient food supplies to support wildlife species during migration. Movement corridors generally consist of riparian, woodlands, or forested habitats that span contiguous acres of undisturbed habitat. Wildlife movement corridors are an important element of resident species home ranges, including deer and coyote. The project site is not located within the Butte County migratory deer corridors. The riparian corridor along Comanche Creek likely serves as a migration and dispersal corridor for a number of species. The existing developed components of the project area (i.e. house and associated structures) could preclude use of the area as a migratory wildlife corridor for large mammals. However, the site may facilitate home range and dispersal movement of resident wildlife species, including birds, small mammals and other wildlife. Subsequent development of the resultant parcels would not restrict regional wildlife movement or wildlife migration patterns primarily due to the larger size of the parcels and building setbacks from the riparian corridor along Comanche Creek. e.) Less than significant impact. Biological resources on the project site were evaluated by NorthStar. Future development on the property would avoid sensitive resources with the establishment of buffer areas. Avoidance of biological resources is consistent with local policies and ordinances created to protect these resources. f.) No impact. The Butte Regional Conservation Plan (BRCP) is a joint Habitat Conservation Plan (HCP)/National Community Conservation Plan (NCCP) that is currently being prepared for the western half of the Butte County. The project site is located within the proposed plan area of the BRCP. After the BRCP is adopted, individual projects that occur in the BRCP planning area would need to be coordinated with the Butte County Association of Governments to ensure that the project does not conflict with the BRCP. As the plan has not been adopted, the proposed project will not conflict, nor interfere with, the attainment of the goals of the proposed plan.

Mitigation Measure #2 (Valley Elderberry Longhorn Beetle) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to construction activities in any areas within potential valley elderberry longhorn beetle habitat, a qualified biologist shall flag, fence, or by other highly visible means identify buffer zones at least 20 feet wide surrounding the drip line of blue elderberry (Sambucus nigra ssp. caerulea) with at least one stem with a diameter at ground level of one inch or greater. The visibly defined buffer zones shall be maintained throughout the duration of construction.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Mitigation Measure #3 (Temporary Fencing) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to construction activities, the project proponent shall use exclusionary fencing to mark the boundaries of elderberry shrubs plus a 20-foot buffer, that are to be avoided. The project proponent shall also mark the boundaries of riparian vegetation, which are to be avoided, plus a 50-foot buffer. The exclusionary fencing shall be maintained in place throughout construction.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

Mitigation Measure #4 (Northwestern Pond Turtle) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “If a northwestern pond turtle is observed in the project area during construction activities, the contractor will temporarily halt construction until the turtle has moved itself to a safe location outside the construction limits. If construction is to occur during the nesting season (late June-July), a pre-construction survey will be conducted by a qualified biologist to locate any northwestern pond turtles or their nests. This survey will be conducted within 500 feet of Comanche Creek no more than two days prior to the start of construction. If a pond turtle nest is located, the biologist will flag the site and determine whether construction activities can avoid affecting the nest. If the nest cannot be avoided, a no-disturbance buffer zone will be established around the nest in coordination with CDFW. The no- disturbance buffer will remain in place until the young have left the nest.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

Mitigation Measure #5 (Western Red Bat) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to the start of construction activities, a survey for roosting bats or maternity roosts shall be conducted by a qualified biologist. The survey shall be performed within seven days prior to the initiation of construction adjacent to areas of appropriate roosting habitat. Accessible areas shall be surveyed during the appropriate time of day to maximize detectability of the species. The survey shall include the areas within 250 feet of the work area. If an active roost is found, no disturbance buffers will be established around the roost. The buffer will be 100 feet for a roost and 250 feet for a maternity roost, the limits of the work area will be clearly marked and a qualified biologist will be retained to monitor construction activities within the vicinity of the roost or maternity roost. If buffer reductions are requested and approved by CDFW, a monthly report shall be submitted to CDFW with information regarding monitoring results and reports will be submitted for the duration of construction activities within buffer areas.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Mitigation Measure #6 (Migratory Birds/Nesting Raptors) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “If construction activities on resultant parcels occurs during the nesting season for birds protected under the Migratory Bird Treaty Act and California Department Fish & Game Code (approximately March 1 – August 31), the project proponent shall retain a qualified biologist to perform preconstruction surveys for nesting bird species. Surveys to identify active bird nests shall be conducted within and 250 feet around the footprint of proposed construction. At least one survey shall be conducted no more than 7 days prior to the initiation of construction activities. If ground disturbance or vegetation removal stops during the construction period for more than 15 days, another survey shall be conducted within 7 days prior to the continuation of construction activities. In the event that nesting raptors or birds protected by CDFC and MBTA are found in or within the footprint of proposed construction, the project proponent shall: 1. Locate and map the location of the nest site; 2. Establish a 250 feet no-disturbance buffer around all active nests; in the event bald eagles are found nesting in the survey area, a 1,000 foot no disturbance buffer shall be established; 3. Within 2 working days of the survey, prepare a report and submit to the County. The report will include the results of survey, location(s) of nests, and location of no disturbance buffers; 4. On-going weekly surveys shall be conducted to ensure that the no disturbance buffer is maintained; 5. Construction can resume when a qualified biologist has confirmed that the nest is no longer active.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, including road construction, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

Mitigation Measure #7 (Swainson’s Hawk) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Any ground disturbance or vegetation removal within the project area should be conducted during the non- breeding season (September 16 through February 28). If construction activities occur during the breeding season (March 1-September 15) then a pre-construction raptor survey will be conducted by a qualified biologist to identify any active Swainson’s hawk nests within and in the vicinity of the BSA. The pre-construction survey will take place in accessible areas within a 0.5-mile radius of the area where construction activities would occur. The required survey radius may be reduced on a case-by-case basis if approved by CDFW, but in no case will be less than 500 feet. At least one survey will be conducted no more than one week prior to the initiation of construction. If no active nests are located, no further measures are necessary to avoid impacts to Swainson’s hawk nests. If active nests are identified, the following measures will be implemented: 1. A no-disturbance buffer zone will be established around the nest. The width of the buffer will be determined by a qualified biologist in coordination with CDFW. Determination of the required width will consider the distance of the nest from construction activities, existing level of disturbance, etc. 2. A qualified biologist will monitor active nests within 500 feet (or the width of the buffer zone) of construction activities. The first monitoring event will coincide with the initial implementation of construction activities and monitoring will continue at least once a week until the young have fledged. If the biologist determines that construction is disturbing the birds and nest failure is possible, CDFW will be notified immediately. Measures to avoid nest failure will be implemented in coordination with CDFW and may include halting some or all construction activities until the young have fledged. For monitored nest sites, a monitoring report will be submitted to CDFW within two weeks after termination of monitoring activities. Plan Requirements: The above referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

Mitigation Measure #8 (Riparian Habitat) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to recordation of the Tentative Subdivision Map, a 50-foot building setback shall be established from the top of the bank of Comanche Creek or the outer edge of the riparian vegetation, whichever is greater. The riparian vegetation and the building setback area shall be delineated on a separate document recorded concurrently with the Tentative Subdivision Map. No disturbance related to the development and use of residences, or allowed uses, within the buffer area is allowed except those that comply with Butte County Code §24-76 to 24-80 et seq. If future construction activities on the resultant parcels would affect the identified riparian vegetation, the project proponent shall obtain a Streambed Alteration Agreement from the CDFW, pursuant to Section 1602 of the CFGC.” Plan Requirements: A 50-foot building setback area shall be established around riparian woodlands on the project site and delineated on a separate document recorded concurrently with the Tentative Subdivision Map, together with the mitigation measure. Timing: Requirements of the condition shall be adhered to prior to Tentative Subdivision Map recording and prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

4.5 Cultural Resources:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Cause a substantial adverse change in the significance of a historical resource as defined in §15064.5? b. Cause a substantial adverse change in the significance of an archaeological resource pursuant to §15064.5? c. Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? d. Disturb any human remains, including those interred outside of formal cemeteries?

Setting: Cultural resources include prehistoric and historic period archaeological sites; historical features, such as rock walls, water ditches and flumes, and cemeteries; and architectural features. Cultural resources consist of any human-made site, object (i.e., artifact), or feature that defines and illuminates our past. Often such sites are found in foothill areas, areas with high bluffs, rock outcroppings, areas overlooking deer migratory corridors, or near bodies of water. Since the project area is located next to a body of water (Comanche Creek), there is the chance that cultural resources could be located on site. Additionally, the property is within an area of high sensitivity for the presence of prehistorical cultural resources. A record search for existing archeological sites and surveys on the project site, and within one-quarter mile, was conducted through the Northeast Information Center (NEIC) of the California Historical Resources Information System on September 7, 2016. Additionally, an intensive pedestrian survey was conducted within the entire project area by Ms. Mary Bailey of Golden Hills Consulting. The record search did not have any listing of any historic properties eligible for either the State or Federal Registers of Historic Places within the project area or the one-quarter mile search radius. Additionally, there are no recorded cultural resources listed with the NEIC within the project area or one-quarter mile radius. However, two prehistoric

■ Butte County Department of Development Services ■ ■ Initial Study – TSM17-0001 (Leen) ■ Page 37 of 76 ■

Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 sites have been recorded within two miles of the project site including the Patrick Rancheria, a Mechoopda village site, and a habitation site with flaked and ground stone plus fire cracked rock. Additionally, there are nine historic resources within a 1.5-mile radius of the project including The Junction, Chico Soda Works, an agricultural school dairy residence and blacksmith shop, Chico MGP Generator Building, Calwater’s water tower and tank, Joe’s Bar, the Wright-Patrick House, and a refuse deposit. The pedestrian survey conducted on September 26, 2016 involved walking transects spaced approximately 10-15 meters throughout the site. The ground surface was largely obscured due to the presence of recently mowed vegetation, small areas were boot-scuffed approximately every 30-50 meters along each transect to examine the ground surface. Areas of exposed dirt including gopher mounds and back-filled percolation test pits were closely examined. Two small manos (hand stones) were discovered in fairly close proximity to each other. The manos are considered lithic isolates and are not considered eligible for either the National or California Register of Historic Places. No other artifacts were discovered within the project site. Impact Discussion: a-d.) Less than significant impact with mitigations incorporated. Historic use of the project site for agriculture has resulted in ground-disturbing activities that likely destroyed cultural resources that may have been located on the surface. According to Ms. Mary Bailey, the type of isolate (manos), and their locations being in close proximity to each other are highly suspicious of possible subsurface resources. Future grading and other soil disturbing activities resulting from the development of the project site have the potential to uncover historic or prehistoric cultural resources located below the surface. Due to the high sensitivity for prehistorical resources to be present within the project site, and discovery of two manos (hand stones) the following mitigation measures are recommended to prevent impacts to the resources that may be uncovered during development activities on the project site. Mitigation Measure #9 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to any ground disturbance the developer shall arrange to have a qualified archaeologist conduct a minimum of four shovel pit tests within the boundaries of Parcels 1-6, 17, 18 and the access road to the south property line of Parcels 6 & 17. The Mechoopda Tribe shall be notified of the time and date of the shovel pit testing to provide the opportunity to monitor excavation. Soil from the shovel test pits shall be screened through standard quarter inch mesh (hardware cloth). The results of the shovel pit tests will be reported to County Planning staff by the qualified archaeologist. If no subsurface evidence of prehistoric cultural resources is located, no additional mitigation is necessary under this measure. Should any prehistoric cultural resources be located, additional consultation with the Mechoopda Tribe, to determine the appropriate steps for recordation and recovery, shall occur before any construction related ground disturbance.” Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet and shall be shown on all site development and building plans. Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to avoid damage to cultural resources and determine appropriate action. Mitigation Measure #10 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to development on the resultant parcels, subsurface investigations shall take place. The property owner shall retain a qualified archaeologist to conduct the subsurface investigation. The investigation will consist of up to two shovel test pits per parcel. Soil from the shovel test pits will be screened through standard one-quarter inch mesh (hardware cloth). The Mechoopda Tribe will be notified to provide the opportunity to monitor excavation of the shovel test pits. Should any prehistoric cultural resources be located, the qualified archaeologist and the Mechoopda Tribe will determine the appropriate steps for recordation and recovery, prior to further ground disturbance. If no subsurface evidence of prehistoric cultural resources is located, no additional mitigation is necessary.” Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet and shall be shown on all site development and building plans.

■ Butte County Department of Development Services ■ ■ Initial Study – TSM17-0001 (Leen) ■ Page 38 of 76 ■

Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to ensure subsurface investigations are performed prior to development on resultant parcels. Mitigation Measure #11 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Should site development activities reveal the presence of prehistoric cultural resources (freshwater shells, beads, bone tool remnants, lithic materials, tools or grinding rocks, etc.) or historic cultural resources (structural remains, refuse deposits, bottle dumps, etc.) the supervising contractor shall cease all work within the area of the find and notify County Planning staff. A qualified archaeologist shall be retained by the property owner to evaluate the significance of the find. Further, the Mechoopda Tribe will be notified to provide the opportunity to monitor evaluation of the find. Site work shall not resume until the qualified archaeologist conducts sufficient research, testing and analysis of the archaeological evidence to make a determination that the resource is either not cultural in origin or determine the appropriate steps for recordation and recovery, including recommendations for total data recovery, Tribal Monitoring, deposition protocol, or avoidance, if applicable. All measures deemed appropriate by County Planning staff shall be implemented pursuant to the terms of the qualified archaeologists report.” Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet and shall be shown on all site development and building plans. Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to avoid damage to cultural resources and determine appropriate action. Mitigation Measure #12 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “If human remains are discovered, all work must immediately cease, and the local coroner shall be contacted. Procedures for the discovery of human remains will be followed in accordance with provisions of the State Health and Safety Code, Sections 7052 and 7050.5 and the State Public Resources Code Sections 5097.9 to 5097.99. If the coroner determines that the remains are those of a Native American, the coroner shall contact the Native American Heritage Commission (NAHC) and subsequent procedures shall be followed, according to State Public Resources Sections 5097.9 to 5097.99, regarding the notification of the Native American Most Likely Descendant. The preceding requirements shall be incorporated into construction contracts and plans to ensure contractor knowledge and responsibility for proper implementation.” Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet and shall be shown on all site development and building plans. Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to avoid damage to cultural resources and determine appropriate action. State law requires the reporting of any human remains.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

4.6 Geologic Processes:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death involving: 1. Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other

substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. 2. Strong seismic ground shaking?

3. Seismic-related ground failure, including liquefaction? 4. Landslides?

b. Result in substantial soil erosion or the loss of topsoil?

c. Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? d. Be located on expansive soil, as defined in Table 18-1- B of the Uniform Building Code (1994), creating substantial risks to life or property? e. Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal system where sewers are not available for the disposal or waste water?

Setting: The Seismic and Geologic Hazards section of the Butte County General Plan indicates that all of Butte County is in Moderate Earthquake Intensity Zone VIII. The project site is not within an Alquist-Priolo Earthquake fault zone or an aftershock zone. The only known active fault within Butte County is the Cleveland Hill fault, located approximately 25.2 miles southeast of the project site, where activity on August 1, 1975 resulted in the Oroville earthquake. The 1975 Oroville earthquake registered a Richter magnitude of 5.7 and resulted in approximately 2.2 miles of ground rupture along the western flank of Cleveland Hill. Geologic Hazards Expansive Soils Expansive soils possess a “shrink-swell” behavior. Shrink-swell is the cyclic change in volume (expansion and contraction) that occurs in fine-grained clay sediments from the process of wetting and drying. Structural damage may occur over a long period of time, usually the result of inadequate soil and foundation engineering or the placement of structures directly on expansive soils. The Health and Safety Element Figure HS-6 of the Butte County General Plan identifies the project site as having a “Low” potential of expansive soils. Soil Erosion Erosion is the wearing away of soil and rock by processes such as wind and precipitation runoff. Soils containing high amounts of silt or clay can be easily erodible, while sandy soils are less susceptible. Excessive soil erosion can eventually lead to damage of building foundations and roadways. Typically, soil erosion potential is reduced once the soil is graded

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 and covered with gravel, concrete, structures, asphalt, or a vegetative cover. The Health and Safety Element Figure HS- 5 of the Butte County General Plan identifies the project site as having a “Slight” potential for soil erosion. Landslides A landslide is the sliding of a mass of loosened rock and/or soil down a hillside or slope. Some of the natural causes of this instability are earthquakes, weak soils, erosion, heavy rainfall and fire. Human activities such as poor grading that undercuts steep slopes or overloads them will fill; excessive irrigation and removal of vegetation can also contribute to landslides. Most landslides in Butte County occur on slopes greater than 15 percent, and most new landslides occur in areas that have experience previous landslides. The areas of highest landslide potential are in the mountainous central area of the county where well-developed soils overlay impervious bedrock on steep slopes. The remaining areas of Butte County has moderate to low landslide potential. The areas of lowest landslide potential are the flat lands of the Sacramento Valley. The Health and Safety Element Figure HS-4 of the Butte County General Plan identifies the project site as having “Low” to “No” landslide potential. Seismic Hazards Surface Fault Rupture Seismically induced ground rupture is defined as the physical displacement of surface deposits in response to movement on the fault place. The magnitude, sense, and nature of fault rupture can vary for different faults or event along different strands of the same fault. Ground rupture is considered more likely along active faults. The Cleveland Hills fault (located approximately 25.2 miles southeast of the project site) is the only fault located within Butte County that has been identified as an active fault pursuant to the Alquist-Priolo Earthquake Fault Zones Act. This fault was responsible for the 1975 Oroville earthquake, which had a Richter magnitude of 5.7 and produced surface displacement along approximately 2.2 miles of the fault. Other active and potentially active faults are located in the region. However, because there are no known active faults underlying or adjacent to the project site, the likelihood of surface fault rupture is very low and would not be a design consideration. Ground Shaking Ground shaking at the project site could occur due to earthquakes on the regions active faults. However, ground motions attenuate with distance from the causative fault, as well as the local geologic and soil conditions. The Seismic Hazards Mapping Program of the California Geological Survey categorizes all of Butte County as a “seismic hazard zone” since the entire County is subject to earthquakes of Modified Mercalli Intensity scale VIII. The Oroville earthquake of 1975 is the only earthquake of this intensity recorded in Butte County. This earthquake resulted in structural damage, partial destruction of some buildings, fires and numerous injuries. Though, it is accepted that earthquakes of magnitude 6.0 or 6.5 are possible anywhere in Butte County, the county is generally considered to be an area of low seismic activity. Liquefaction Liquefaction is a phenomenon whereby unconsolidated and/or near saturated soils lose cohesion and are converted to a fluid state as a result of sever vibratory motion. The relatively rapid loss of soil shear strength during strong earthquake shaking results in the temporary fluid-like behavior of the soil. Soil liquefaction causes ground failure that can damage roads, pipelines, underground cables, and building with shallow foundations. Liquefaction can occur in areas characterized by water- saturated, cohesionless, granular materials at depths less than 50 feet. Due to the relatively low potential for strong ground motions and a general lack of significant deposits of saturated loose soils, such as alluvium, the liquefaction potential, if any, can be addressed in the design of future structures during the building permit review process. Seiches A seiche is a periodic oscillation of a body of water such as a reservoir, river, lake, harbor, or bay resulting from seismic shaking or other causes such as landslides into a body of water. The period of the oscillation varies depending on the side of the body of water and may be several minutes to several hours. Depending on the magnitude of the oscillations, seiches can cause considerable damage to dams, levees and shoreline facilities. Seiches have not been recorded in any of the reservoirs in Butte County that are within the jurisdiction of the California Division of Dam Safety. However, the potential for seiches does exist in Butte County, either from landslides or from stronger earthquakes that have been experienced in historical times. Impact Discussion: a1.) Less than significant impact. The site is not located in an Alquist-Priolo Earthquake fault zone, there are no known active faults underlying, or adjacent to, the project site. The Cleveland Hill fault is located over 25.2 miles southeast of the project site. Because the nearest active fault is located a considerable distance from the project site, the likelihood of a surface rupture at the project site is very low, and would not be a design consideration.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 a2.) Less than significant impact. Ground shaking at the project site could occur due to the earthquake potential of the regions active faults. However, active faults are relatively distant from the project site. As a result, ground shaking due to seismic events is expected to have low intensities at the project site. Future residential development on the resultant parcels would be subject to the California Building Code (CBC). The CBC would provide minimum standards to safeguard life or limb, health, property and public welfare by regulating the controlling the design, construction, quality of materials, use and occupancy, location, and maintenance of buildings and structures within Butte County. Among the provisions of the CBC are building design criteria for earthquake conditions in Butte County. Adherence to the CBC during building construction would ensure that potential impacts are less than significant. a3.) Less than significant impact. The project site is identified as being located within an area considered “Generally Moderate” in respect to liquefaction potential. The California Building Code (CBC) regulates the construction of structures, which may be constructed with approval of the proposed project. Adherence to CBC standards at the time of development of the resultant parcels would ensure that any impacts from an unstable geologic unit or soil are less than significant. a4.) Less than significant impact. The project area is primarily level with 0-2% slopes. As a result, the landslide potential for the project site and surrounding area is very low. Though the potential for landslides are generally low, shallow slope failures can occur in virtually any sloping terrain during construction activities. Avoidance of potentially sensitive slopes and/or implementation of appropriate engineering and construction measures at the time of development would avoid or reduce potential impacts of landslides to a less than significant level. b.) Less than significant impact. Surface soil erosion and loss of topsoil has the potential to occur from disturbances associated with future construction-related activities. Construction activities could also result in soil compaction and wind erosion effects that could adversely affect soils and reduce the revegetation potential at the construction site and staging areas. During construction-related activities, specific erosion control and surface water protection methods for each construction activity would be implemented on the project site. The type and number of measures implemented would be based upon location-specific attributes (i.e., slope, soil type, weather conditions). These control and protection measures, or BMPs, are standard in the construction industry and are commonly used to minimize soil erosion and water quality degradation. Additionally, future construction activities would be subject to the National Pollutant Discharge Elimination System (NPDES) General Construction Activities Storm Water permit program because one acre or more of land would be disturbed. Construction activities that result in a land disturbance of less than one acre, but which are part of a larger common plan of development, also require a permit. This program requires implementation of erosion control measures during and immediately after construction that are designed to avoid significant erosion during the construction period. In addition, the project operation would be subject to State Water Resources Control Board requirements for the preparation and implementation of a project specific Storm Water Pollution Prevention Plan (SWPPP) to control pollution in stormwater runoff from the project site, including excessive erosion and sedimentation. The SWPPP, must be obtained prior to any soil disturbance activities. Implementation of standard erosion control BMP’s during future construction-related activities, together with adherence to State requirements regarding grading activities, would ensure that potential erosion impacts are less than significant. c.) Less than significant impact. Destabilization of natural or constructed slopes could occur as a result of future construction activities. Excavations, grading, and fill operations associated with providing access to the resultant parcels and during development could alter existing slope profiles making them unstable as a result of over- excavation of slope material, steepening of the slope, or increased loading. Standard engineering design features and construction procedures would be implemented to maintain stable slopes and excavations during construction, reducing impacts of unstable slopes to a less than significant level. d.) Less than significant impact. Figure HS-6 of the General Plan Health and Safety Element indicates the proposed project site has a low expansive soil potential. Expansive soils can cause structural damage particularly when concrete structures are in direct contact with the soils. Appropriate design features to address expansive soils may include excavation of potentially problematic soils during construction and replacement with engineered backfill, ground-treatment processes, direction of surface water and drainage away from foundation soils, and the use of deep foundations such as piers or piles. Implementation of these standard engineering methods would ensure that impacts associated with expansive soils would remain less than significant.

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e.) Less than significant impact. The project proposes a community wastewater system, a septic tank effluent pump (STEP) system where an individual septic tank equipped with an effluent pump to a common dose tank via a common pressure main. The pressure line and service connection (shutoff valve, check valve and valve box) will be installed for a lot at the time of other utilities and subdivision improvements. The wastewater disposal area will be located on the open space parcel (Lot A). The applicant completed a pre-application review with Butte County Department of Environmental Health, in accordance with Chapter 19 of Butte County Code (On-Site Wastewater Systems). As part of the review, an initial septic location on the resultant parcels were evaluated and determined to have adequate soil conditions to allow for future development of an on-site wastewater system. Future development requiring wastewater disposal is required to receive an On-Site Wastewater System Construction Permit from Butte County Environmental Health Division. Application for a Construction Permit will include detailed plans of the proposed wastewater system, prepared by a Certified Installer or Certified Designer, which will demonstrate compliance with County regulations and the County’s On-Site Wastewater Manual, and to ensure a safe, sanitary, and environmentally sound wastewater system. Mitigation Measure: None required.

4.7 Greenhouse Gas Emissions:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Generate greenhouse gas emissions, either directly or indirectly, that may have a significant impact on the environment? b. Conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the emissions of greenhouse gases?

Setting: Global climate change is the observed increase in the average temperature of the Earth’s atmosphere and oceans along with other significant changes in climate (such as precipitation or wind) that last for an extended period of time. The term “global climate change” is often used interchangeably with the term “global warming,” but “global climate change” is preferred to “global warming” because it helps convey that there are other changes in addition to rising temperatures. Global surface temperatures have risen by 0.74°C ± 0.18°C over the last 100 years (1906 to 2005). The rate of warming over the last 50 years is almost double that over the last 100 years.1 The prevailing scientific opinion on climate change is that most of the warming observed over the last 50 years is attributable to human activities. The increased amounts of carbon dioxide (CO2) and other greenhouse gases (GHGs) are the primary causes of the human-induced component of warming. GHGs are released by the burning of fossil fuels, land clearing, agriculture, and other activities, and lead to an increase in the greenhouse effect.2 GHGs are present in the atmosphere naturally, are released by natural sources, or are formed from secondary reactions taking place in the atmosphere. The following are the gases that are widely seen as the principal contributors to human-induced global climate change:3

 Carbon dioxide (CO2)

 Methane (CH4)

 Nitrous oxide (N2O)

1 Intergovernmental Panel on Climate Change (IPCC), 2007. Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the IPCC. 2 The temperature on Earth is regulated by a system commonly known as the "greenhouse effect.” Just as the glass in a greenhouse allows heat from sunlight in and reduces the amount of heat that escapes, greenhouse gases like carbon dioxide, methane, and nitrous oxide in the atmosphere keep the Earth at a relatively even temperature. Without the greenhouse effect, the Earth would be a frozen globe; thus, although an excess of greenhouse gas results in global warming, the naturally occurring greenhouse effect is necessary to keep our planet at a comfortable temperature. 3 The greenhouse gases listed are consistent with the definition in Assembly Bill (AB) 32 (Government Code §38505) . ■ Butte County Department of Development Services ■ ■ Initial Study – TSM17-0001 (Leen) ■ Page 43 of 76 ■

Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

 Hydrofluorocarbons (HFCs)

The earth’s atmosphere naturally contains a number of gases, including (but not limited to) carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), which are collectively referred to as greenhouse gases (GHGs). GHG emissions are generally numerically depicted (when applicable) as carbon dioxide equivalents (CO2e). CO2e represents CO2 plus the additional warming potential from CH4 and N2O. The common unit of measurement for carbon dioxide equivalents is in metric tons (MTCO2e). These gases trap some amount of solar radiation and the earth’s own radiation, preventing it from passing through earth’s atmosphere and into space. GHG are vital to life on earth; without them, earth would be an icy planet. For example, CO2 is an element that is essential to the cycle of life. In general, CH4 and N2O have 21 and 310 times the warming potential of CO2, respectively. Human-made emissions of GHG occur through the combustion of fuels, as well as a variety of other sources. Over the last 200 years, human activities have caused substantial quantities of GHGs to be released into the atmosphere. These extra emissions are increasing GHG concentrations in the atmosphere and enhancing the natural greenhouse effect, which is believed to be causing global warming, while manmade GHGs include naturally-occurring GHGs such as CO2, methane, and N2O, some gases, such as HFCs, PFCs, and SF6 are completely new to the atmosphere. Section 15064.4 of the CEQA Guidelines sets forth guidance for determining the significance of Impacts from Greenhouse Gas Emissions. The guidelines allow impacts from a particular project to be described quantitatively or qualitatively and direct that impacts should be evaluated in consideration of existing environmental setting, applicable thresholds of significance, and compliance with regulations and requirements adopted to implement the mitigation of greenhouse gas emissions. Section 15064 (h)(3)of the CEQA Guidelines specifies that a project’s contribution to a cumulative effect may be found ‘not cumulatively considerable’ if the project will comply with the requirements in a previously approved plan or mitigation program, including plans or regulations for the reduction of greenhouse gas emissions. Butte County has not adopted a plan or mitigation program for the reduction of greenhouse gases as of the publication of this study. Likewise, it has not adopted thresholds of significance for evaluating greenhouse gas emissions. This section evaluates greenhouse gas emissions relative to the existing environmental setting and compliance with air quality regulations relative to automobile emissions, the primary contributor to greenhouse gas emissions from the proposed project. Increasing GHG concentrations are believed to be warming the planet. As the average temperature of the earth increase, weather may be affected, including changes in precipitation patterns, accumulation of snow pack, and intensity and duration of spring snowmelt. Climate zones may change, affecting the ecology and biological resources of a region. There may also be changes in fire hazards due to the changes in precipitation and climate zones. While scientists have established a connection between increasing GHG concentrations and increasing average temperatures, important scientific questions remain about how much warming would occur, how fast it would occur, and how the warming would affect the rest of the climate system. At this point, scientific efforts are unable to quantify the degree to which human activity impacts climate change. The phenomenon is worldwide, yet it is expected that there would be substantial regional and local variability in climate changes. It is not possible with today’s science to determine the effects of global climate change in a specific locale, or whether the effect of one aspect of climate change may be counteracted by another aspect of climate change, or exacerbated by it. Section 15183.5(b) of Title 14 of the California Code of Regulations states that a GHG Reduction Plan, or a Climate Action Plan, may be used for tiering and streamlining the analysis of GHG emissions in subsequent CEQA project evaluation provided that the CAP does the following: A. Quantify greenhouse gas emissions, both existing and projected over a specified time period, resulting from activities within a defined geographic area; B. Establish a level, based on substantial evidence, below which the contribution to greenhouse gas emissions from activities covered by the plan would not be cumulatively considerable; C. Identify and analyze the greenhouse gas emissions resulting from specific actions or categories of actions anticipated within the geographic area; D. Specify measures or a group of measures, including performance standards, that substantial evidence demonstrates, if implemented on a project-by-project basis, would collectively achieve the specified emissions level;

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E. Establish a mechanism to monitor the plan’s progress toward achieving the level and to require amendment if the plan is not achieving specified levels; and F. Be adopted in a public process following environmental review. A 2006 baseline GHG emission inventory was prepared for unincorporated Butte County. The inventory identified the sources and the amount of GHG emissions produced in the county. Within Butte County, the leading contributors of GHG emissions are agriculture (43%), transportation (29%), and residential energy (17%). A Climate Action Plan (CAP) was adopted by Butte County on February 25, 2014. The CAP provides a framework for the County to reduce GHG emissions while simplifying the review process for new development. Measures and actions identified in the CAP lay the groundwork to achieve the adopted General Plan goals related to climate change, including reducing GHG emissions to 1990 levels by 2020. In an effort to implement the measures of the CAP, a development checklist was created to evaluate a new projects consistency with the CAP, and to identify which GHG emission reduction measures would be implemented with project approval. The CAP development checklist identified three reduction measures applicable to the proposed project. These measures include expansion of renewable energy systems for new residential development by prewiring future development for photovoltaic systems; reduction of construction equipment idling time; and, installation of electric vehicle charging outlets in the garage or the exterior of the home (See Attachment A). Impact Discussion: a.) Less than significant impact with mitigation incorporated. The proposed project is a minor subdivision that would contribute to the existing greenhouse gas inventory for Butte County through the creation of 21 parcels for future residential development. Eventual residential development would generate direct emissions through the consumption of electricity, natural gas, and propane, as well as from fuel usage for landscaping equipment. Development would also generate additional vehicle trips to and from the residence. Additionally, construction activities of future development would also create greenhouse gas emissions, primarily from the use of heavy equipment. To reduce the anticipated increase in of GHG emissions that would ultimately be created by the proposed project, GHG reduction measures from the Butte County Climate Action Plan were identified through CAP development checklist review. Implementation of the following mitigation measure would ensure the project’s consistency with the CAP and that impacts from GHG emissions are less than significant. b.) Less than significant impact. The Butte County General Plan and Butte County Climate Action Plan establish numerous policies relative to greenhouse gases. The proposed subdivision would not generate greenhouse gas emissions; however, future development of the resultant parcels would increase GHG emissions, although on a limited scale. Due to the limited development potential of the project site, the anticipated increase in emissions would not conflict with the applicable with policies adopted for the purpose of reducing GHG emissions. Mitigation Measure #13 (Greenhouse Gas Emissions) Place a note on a separate document which is to be recorded concurrently with the final map or on an additional map sheet that states: “To the extent feasible, the developer shall implement the following measures at the time of development to offset the anticipated contribution of greenhouse gas emissions from residential development:  Support expansion of renewable energy systems o Prewire all new residential development to support photovoltaic system installation.  Support efficiency in vehicles and landscaping equipment o Install electrical vehicle outlets on external walls or in garages in all new residential development.  Improve fuel efficiency of equipment during construction-related activities o Minimize idling time either by shutting equipment off when not in use or reducing the time of idling to no more than 3 minutes. o Use clean or alternative fuel equipment” Plan Requirements: The note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. This note shall also be placed on all building and site development plans.

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Timing: Shall be implemented prior to issuance of building permits for residential development. Construction-related measures shall be adhered to throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. The Planning Division will ensure that future residential development includes the applicable measures during Building Permit review. Building inspectors shall spot check and shall ensure compliance on-site.

4.8 Hazards and Hazardous Materials:

disposal of hazardous materials? b. Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment? c. Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one- quarter mile of an existing or proposed schools? d. Be located on a site which is included on a list of hazardous materials sites complied pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or the environment? e. For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard for people residing or working in the project area? f. For a project within the vicinity of a private airstrip, would the project result in a safety hazard for people

residing or working in the project area? g. Impair implementation of or physically interfere with an adopted emergency response plan or emergency

evacuation plan? h. Expose people or structures to a significant risk or loss, injury or death involving wildland fires, including where wildlands are adjacent to urbanized areas or where residences are intermixed with wildlands?

Settings Hazardous Materials Under Government Code Section 65962.5, the California Department of Toxic Substances Control (DTSC) maintains a list of hazardous substance sites. The list, often referred to as the “Cortese list”, includes CALSITE hazardous materials sites, sites with leaking underground storage tanks, and landfills with evidence of groundwater contamination. A search of the state and federal agency databases for hazardous materials sites within one-mile of the project site was performed and the project site is within one-mile of an identified clean-up site (envirostor.dtsc.ca.gov). Diamond Match Factory, a State Response clean-up site, is located approximately 0.85 miles to the northeast of the project site. A groundwater plume contaminated with trichloroethylene (TCE) is found beneath the project area. Victor Industries, formerly located at 365 East 20th Street in the City of Chico approximately 1.5 miles northeast of the project site used TCE as

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 a degreaser/solvent in the process of manufacturing aluminum tubes. Solvent disposal practices (dumping on the ground) resulted in the contamination of the soil and the subsequent groundwater contamination plume that stretches from East 20th Street to beneath the Stanley Park neighborhood. Private wells in the area were contaminated and after several phases of investigation the Stanley Park neighborhood was connected to the California Water Service (Calwater) domestic water service in the mid 1990’s. In September of 2016 the Department of Toxic Substances Control (DTSC) reviewed and concurred with the activities outlined in the 2016 Final Groundwater Characterization Workplan Amendment for the Victor Industries site. The objectives of the workplan are to further characterize the lateral extent of the TCE contaminated groundwater within monitoring zone D, which will include the installation of three monitoring wells, aquifer testing and groundwater sampling in monitoring zones B and C, and characterization of microbial species in the groundwater. Airports Air transportation in Butte County is served by a number of private and public airfields and heliports serving general aviation and agricultural users. There are four major aviation facilities in Butte County that serve the general public, Chico Municipal Airport, Ranchaero Airport, Oroville Municipal Airport, and Paradise Skypark. Ranchaero Airport is the nearest general aviation airport to the project site. The airport is located approximately 1.6 miles northwest of the project site, portions of the project are located with the Zone D compatibility zone for the airport. Wildland Fire Conditions The combination of highly flammable fuel, long dry summers and steep slopes creates a natural hazard of wildland fires in many areas of Butte County. Wildland fires can result in death, injury, economic losses, and a large public investment in firefighting efforts. Woodland and other natural vegetation can also be destroyed during wildfires, resulting in the loss of timber, wildlife habitat, scenic quality, and recreation. Areas in the county that are particularly susceptible to wildland fires largely contain dense vegetation and steep slopes, which aide in the spread of fire. These areas have been designated as Fire Hazard Severity Zones by the State Department of Forestry and Fire Protection (Cal Fire), and generally include the foothill and mountainous regions of Butte County. Fire protection services for unincorporated Butte County are generally provided by the Butte County Fire Department (BCFD) and the California Department of Forestry and Fire Protection (CalFire), with CalFire having fiscal responsibility for preventing and suppressing wildfires. The project area falls into the service area of Butte Unit-Battalion 4 of BCFD. According to the Health and Safety Element of the Butte County General Plan, the project site is not located in a Fire Hazard Severity Zone and is located within the Local Responsibility Area (LRA) for fire protection. Impact Discussion: a.) Less than significant impact. Future construction activities associated with the development of the proposed project could involve the uses of potentially hazardous materials including gasoline, diesel fuel, hydraulic fluid, solvents, oils, etc. would be used to maintain vehicles and motorized equipment during construction- related activities. However, all potentially hazardous materials would be contained, stored, and used in accordance with manufactures’ specifications and handled in compliance with all standards and regulations. It is not anticipated that large quantities of hazardous materials would be permanently stored or used within the project area. It is likely after construction of the project small quantities of publically available hazardous materials (e.g. paint, herbicides, and maintenance supplies) may be used routinely for residential maintenance and cleaning. However, these materials would not be used in sufficient strength or quantity to create a substantial risk of fire or explosion, or otherwise pose a substantial risk to environmental or human health. b.) Less than significant impact. It’s not anticipated that construction or operation of future residential development would create a significant hazard to the environment or to the public due to the accidental release of hazardous materials into the environment. Accidental release of hazardous materials routinely used during construction activities are addressed in section a.), above. c.) No impact. No existing or proposed schools have been identified within one-quarter mile of the project site. d.) No impact. A review of regulatory agency databases, which included lists of hazardous materials sites compiled pursuant to California Government Code Section 65962.5, did not identify contamination site as being located within, or in the vicinity of, the project site.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 e.) Less than significant impact. Ranchaero Airport, a public use airport, is located approximately 1.6 miles northwest of the project site. Portions of the project site fall within the airports influence area boundary, specifically, within Zone D of the Ranchaero Airport Land Use Compatibility Map. Zone D is an area included in the vicinity of the airport that is overflown less frequently or at a higher altitude by arriving or departing aircraft. Additionally, the length of the runway at Ranchaero Airport limits its use to single-engine airplanes and helicopters. As a result, no safety hazards associated with airport operations are anticipated to affect people working or residing within the project site. f.) No impact. No private airports have been identified to be located within the vicinity of the project site. As a result, no safety hazards associated with airport operations are anticipated to affect people working or residing within the project site. g.) Less than significant impact. The proposed project does not include any actions that physically interfere with any emergency response or emergency evacuation plans. Development of the resultant parcels would add a small amount of trips onto the area roadways; however, area roadways and intersections would continue to operate at an acceptable level of service. If future construction activities require work to be performed in the roadway, appropriate traffic control plans would be prepared in conjunction with a Butte County Encroachment Permit. h.) No impact. The project site is not located in a Fire Hazard Severity Zone or a State Responsibility Area. As a result, existing and subsequent development on the resultant parcels, as well as its residents, would not be exposed to a significant wildland fire risk. The nearest Butte County/CDF staffed fire station is Station #44 located at 2334 Fair Street in the City of Chico approximately 1.45 miles to the northeast of the project area. Mitigation Measure: None required.

4.9 Hydrology and Water Quality:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Documen Incorporated t a. Violate any water quality standards or waste discharge requirements? b. Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of preexisting nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? c. Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off-site? d. Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off-site? e. Create or contribute runoff water which would exceed the capacity of existing or planned storm water drainage systems or provide substantial additional sources of polluted runoff? f. Otherwise substantially degrade water quality?

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

g. Place housing within a 100-year flood hazard area as mapped by Federal Flood Hazard Boundary, Flood Insurance Rate Map, or other flood hazard delineation map? h. Place within a 100-year flood hazard area structures which would impede or redirect flood flows? i. Expose people or structures to a significant risk or loss, injury, or death involving flooding, including flooding as a result of the failure of a levee or dam? j. Inundation by seiche, tsunami, or mudflow?

Setting: Surface Water Butte County has been subject to flooding from various rivers and creeks, particularly from the northeast. The County has completed an assessment of flooding hazards as part of the Butte County Flood Mitigation Plan. The following areas are the principal flood hazards in the project vicinity. Butte Creek, Little Chico Creek, Little Chico Creek Diversion, Mud Creek, Sycamore Creek, Comanche Creek, Rock Creek, and Keefer Slough. Comanche Creek is present along the southern boundary of the project area. Comanche Creek originates as an irrigation diversion for M&T Ranch at the Parrot-Phelan Diversion along Butte Creek approximately four miles east of the City of Chico. The creek flows in a westerly direction along the southern portion of the City of Chico, approximately paralleling Little Chico Creek. Historically, Comanche Creek was an intermittent stream draining the Doe Mill Ridge until the construction of the irrigation diversion. Comanche Creek receives water from the irrigation diversion as well as storm water run-off from the City of Chico urban areas, the creek holds water year-round as its primary use is agricultural water conveyance to M&T Ranch west of Chico. Flooding Flooding events can result in damage to structures, injury or loss of human and animal life, exposure of waterborne diseases, and damage to infrastructure. In addition, standing floodwater can destroy agricultural crops, undermine infrastructure and structural foundations, and contaminate groundwater. The Federal Emergency Management Agency (FEMA) is responsible for mapping areas subject to flooding during a 100-year flood event (i.e., 1 percent chance of occurring in a given year). FEMA also provides guidance on floodplain management and manages the National Flood Insurance Program, which provides insurance to communities that participate in the program, and works with State and local agencies to develop floodplain management policies and mitigation measures. Federal flood insurance is required for any structure within a Special Flood Hazard Zone (Zone A, AE, AO, and AH), for any property that has a federally insured loan. According to floodplain mapping of the project area, the project site is located within unshaded Zone X, and Zones A, AE, and AO. The X Zone is defined by FEMA as areas of minimal flood hazard from the principal source of flood in the area and determined to be outside of the 0.2 percent annual chance floodplain. Zones A, AE, and AO are determined to be areas subject to inundation by the 1 percent annual chance flood. Base flood elevations are not determined for Zone A, determined for Zone AE, and flood depths within Zone AO are 1 to 3 feet, usually in the form of sheet flow. Inundation Zone Dam failure is generally a result of structural instability caused by improper design or construction, instability resulting from seismic shaking, or overtopping and erosion of the dam. Larger dams that are higher than 25 feet or with storage capacities over 50 acre-feet of water are regulated by the California Dam Safety Act, which is implemented by the California Department of Water Resources, Division of Safety of Dams (DSD). The project site is not identified as being located in the inundation zone for any dams regulated by the California Dam Safety Act. Impact Discussion: a.) Less than significant impact. Future development associated with the proposed project would require grading, excavation and general site preparation activities that could result in erosion of soils on-site and sedimentation during storm or high wind events. Erosion of onsite soils would temporarily impact surface water quality and water quality

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within nearby waterways. Downstream impacts from erosion include increased turbidity and suspended sediment concentrations. Eroded soils also contain nitrogen, phosphorous and other nutrients, that when deposited in water bodies, can trigger algal blooms that reduce water clarity, deplete oxygen, and create odors. Eroded sediments may blanket fauna, and the increased cloudiness from suspended sediments may also reduce photosynthesis that produces food supply and natural aquatic habitat (Butte County General Plan 2030). As discussed in Section 4.6 – Geologic Processes, the physical characteristics of the soil at the project site indicate that susceptibility to erosion is slight. During construction-related activities, specific erosion control and surface water protection methods for each construction activity would be implemented on the project site. The type and number of measures implemented would be based upon location-specific attributes (i.e., slope, soil type, weather conditions). These control and protection measures, or Best Management Practices (BMPs), are standard in the construction industry and are commonly used to minimize soil erosion and water quality degradation. Additionally, future construction activities may be subject to the National Pollutant Discharge Elimination System (NPDES) General Construction Activities Storm Water permit program if one acre or more of land is disturbed. Construction activities that result in a land disturbance of less than one acre, but which are part of a larger common plan of development, also require a permit. This program requires implementation of erosion control measures during and immediately after construction that are designed to avoid significant erosion during the construction period. Project operations that are under a NPDES permit would also be subject to State Water Resources Control Board requirements for the preparation and implementation of a Storm Water Pollution Prevention Plan (SWPPP) to control pollution in stormwater runoff from the project site. A condition of approval reflecting the requirement of the applicant to obtain a NPDES permit, prior to grading activities, will be included with project approval. Groundwater Quality Future development on the resultant parcels also has the potential to contribute pollutants to area groundwater. Nitrate contamination of groundwater is one of the most widespread pollutants and may impact area residents who utilize groundwater as their main source of drinking water. High concentrations of nitrate in groundwater are primarily caused by human activities, including fertilizer application (synthetic and manure), animal operations, industrial sources (wastewater treatment and food processing facilities), and septic system. Nitrate contamination poses a health risk to many rural areas where drinking water is obtained from wells that are often shallow and vulnerable to contamination. The California Department of Public Health set a Maximum Contaminant Level (MCL) of 45 milligrams per liter (mg/L) for nitrates in drinking water. Levels of nitrate that exceed safe drinking water standards can interfere with the ability of red blood cells to carry oxygen to the tissues of the body producing a condition called methemoglobinemia. The groups with the greatest risk of becoming ill through ingesting nitrate are infants under 6 months and pregnant women. Groups with the lowest risk of becoming ill are healthy children and adults (CDPH). The project proposes a community wastewater system, a septic tank effluent pump (STEP) system where an individual septic tank equipped with an effluent pump to a common dose tank via a common pressure main. The pressure line and service connection (shutoff valve, check valve and valve box) will be installed for a lot at the time of other utilities and subdivision improvements. The wastewater disposal area will be located on the open space parcel (Lot A). The applicant completed a pre-application review with Butte County Department of Environmental Health, in accordance with Chapter 19 of Butte County Code (On-Site Wastewater Systems). Their review identified the parcels are mostly flat open land with single dwelling residences along Stanley Avenue. Soil profiles were conducted by Certified Designer Northstar Engineering on April 28, 2016, with staff from this office present during the site evaluation. Soils were evaluated in the areas proposed for leach field area and replacement. In summary, the soil profile holes indicated soil class to be sandy clay loam with a 0.6 gallons per day application rate and no signs of ground water present. The project proposes a community wastewater system, a septic tank effluent pump (STEP) system where an individual septic tank equip with an effluent pump to a common dose tank via a common pressure main. The pressure line and service connection (shutoff valve, check valve, and valve box) will be installed for every lot at the time of other utilities and subdivision improvements. The community wastewater system will be managed by a CSA with all necessary legal entitlements and financial assurances in place as per County requirements. Using the combination of soils classification along with the designer's suggestion, it is agreed with Northstar Engineering's findings that, per BCC Chapter 19-10 C., the Minimal Usable Wastewater Area (MUWA) and replacement for the subdivision is 66,000 square feet and that this requirement is met. A new STEP system will require a permit issued by BCEH along with continual review of the construction permit to meet all required setbacks. b.) Less than significant impact. Domestic water to existing and planned uses on the resultant parcels would be provided via an extension of the Calwater service line to the Stanley Park neighborhood.

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General Plan 2030 and the associated Environmental Impact Report included several actions and policies to address groundwater supplies and sustain groundwater resources. Butte County also has adopted the Butte County Integrated Water Resources Plan and Butte County Groundwater Management Plan, and has performed an analysis of long-term water usage and supplies with the 2001 Butte County Water Inventory and Analysis. The findings contained in these reports, together with the application of these existing policies and plans, led Butte County to conclude that the growth anticipated with General Plan 2030 would have a less than significant impact to groundwater supplies. The proposed project has the potential to result in a net increase in impervious surfaces on the project site from the development of new residences or other structures. Future development would result in only a minor increase in impervious surfaces from the construction of concrete foundations, access road surfacing, hardscaping, and cul-de- sac and street improvements. Thus, the proposed project would not cause a measureable reduction in surface infiltration or a decrease in deep percolation to the underlying aquifers. c.) Less than significant impact. Ground disturbance during construction activities associated with the build-out of the resultant parcels may alter existing drainage pathways, expose surface soils to become more susceptible to erosive forces (i.e., overland flow) and/or generate enough increased runoff through removal/clearing of existing vegetation to increase surface erosion. As discussed in section a.), above, implementation of erosion control measures or BMPs during construction activities would minimize soil erosion and water quality degradation. d.) Less than significant impact. Construction activities associated with build-out of the resultant parcels would not alter drainage patterns such that they would cause on- or off-site flooding. Some vegetation removal and soil disturbance would occur during clearing of the site, resulting in the potential for increased stormwater runoff. However, implementation of BMPs would minimize the potential for surface runoff and reduce the potential for flooding. The minor increase in impervious surface area from build-out of the resultant parcels is not anticipated to be enough to alter existing drainage patterns or cause off-site flooding. While some increase in stormwater runoff may be expected due to the reduced absorption rate created from new impervious surfaces on the site, such as structures, driveways, and hardscape (walkways, patios), future development would be reviewed by the Butte County Public Works Department to ensure any potential drainage concerns are addressed, and to ensure no net increase in stormwater runoff leaves the project site. e.) Less than significant impact. When precipitation falls onto the ground surface, it naturally infiltrates into the ground, and when the ground is saturated, it runs off as surface flow. Stormwater in Butte County is currently conveyed through a system of ditches, culverts and underground storm sewers to regional waterways. Stormwater that falls on impervious surfaces such as roads, driveways and parking lots picks up residual pollution such as oil, sediment, and trash. These materials are then washed into waterways and pollute the rivers and reservoirs of Butte County and other downstream receiving waters. In addition, stormwater runs off impervious surfaces at a faster rate than off soil or natural surfaces. Increase rates stormwater runoff can result in hydromodification of downstream waterways through eroded streambanks and deeply cut creek channels (Butte County General Plan 2030). The proposed project is likely to generate a minor increase in runoff from the future development of the resultant parcels, such as with the construction of new residences or access roads. These improvements are relatively small and conveyed through a system of ditches and culverts to area waterways. General Plan 2030 Water Resource Element contains policies that address stormwater runoff capacity. Policy W- P1.4 encourages Low Impact Development, which minimizes impervious areas, minimizes runoff and pollution, and incorporates best management practices. Policy W-P5.3 allows and encourages pervious pavements. Policy W- P5.5 requires that stormwater collection systems be installed concurrently with construction of new roadways to maximize efficiency and minimize disturbance due to construction activity. Policy HS-P3.2 requires that applicants for new development provide plans detailing existing drainage conditions and specifying how runoff will be detained or retained on-site and/or conveyed to the nearest drainage facility, without increasing the peak flow runoff to said channel or facility. Policy HS-P3.3 requires that all development include stormwater control measures and site design features that prevent any increase in the peak flow runoff to existing drainage facilities. As a condition of approval to the project, the applicant shall submit drainage plans and calculations to the County Public Works Department. Engineering plans will detail existing drainage conditions and specify how stormwater runoff will be either detained or retained onsite and/or conveyed to the nearest natural drainage channel or publicly- maintained facility. Engineering calculations will show there is no increase in peak flow runoff leaving the property.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

All improvements associated with the proposed project will be made in accordance with the Butte County Improvement Standards. Implementation of these conditions of approval, together with the application of existing County and State regulations and policies would ensure that the anticipated minor increase in runoff would not exceed the capacity of any existing stormwater drainage systems or substantially increase polluted runoff. f.) Less than significant impact. The proposed project would not result in potential surface water pollution beyond the issues discussed in section a.), above. Therefore, the proposed project would not otherwise degrade water quality beyond the issues previously addressed. g.) Less than significant impact. According to the FEMA National Flood Insurance Program, Flood Insurance Rate Map for the site, most of the project site is located within unshaded Zone X. The unshaded Zone X is defined by FEMA as areas of minimal flood hazard from the principal source of flood in the area and determined to be outside of the 0.2 percent annual chance floodplain. The area directly adjacent to Comanche Creek and an area within the southwestern portion of the project area fall within Zones A, AE and AO. Zones A and AE are within and immediately surrounding the channel of Comanche Creek while Zone AO is present outside of the channel in the southwest portion of the project area. All the zones are determined to be areas subject to inundation by the 1 percent annual chance flood. Base flood elevations have not been determined for Zone A but are determined for Zones AE and AO. The flood depths within Zone AO are 1 to 3 feet, usually in the form of sheet flow. As a result, proposed improvements and future development on the resultant parcels would be subject to the County’s Flood Hazard Prevention Ordinance. Chapter 26, Article IV of the Butte County Code requires the Department of Development Services to review all applications for new construction or subdivisions within flood hazard areas, and requires that the lowest floor of any new construction or substantial improvements within Flood Zones A, AE, and AH, be elevated 1-foot or more above the Base Flood Elevation (BFE). Applications must also show that development within the floodplain will not raise the existing BFE in a manner that adversely affects any neighboring property. Implementation of these requirements at the time of development would ensure potential flood impacts are less than significant. h.) Less than significant impact. See discussion 4.19(g) – Hydrology and Water Quality. i.) Less than significant impact. See discussion 4.19(g) – Hydrology and Water Quality The project site is not in an inundation zone for any dams regulated by the California Dam Safety Act. j.) No impact. Although located within a seismically-active region, the project site is not located in an area that would be impacted by a seiche, tsunami, or mudflows. Mitigation Measure: None required.

4.10 Land Use:

b. Conflict with an applicable land use plan, policy, or regulations of an agency with jurisdiction over the project (including, but not limited to, the general plan, specific plan, local coastal program, or zoning ordinance) adopted for the purpose of avoiding or mitigating an environmental effect? c. Conflict with any applicable habitat conservation plan or natural community conservation plan?

Setting: Butte County General Plan The General Plan represents the basic community values, ideals and aspirations with respect to land use, development, transportation, public services, and conservation policy that will govern Butte County through 2030. The land use element of the general plan designates the land use of areas within the county, and includes a description of the

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 characteristics and intensity of each land use category. The land use designation for the project site is Very Low Density Residential. Butte County Zoning Ordinance The Zoning Ordinance implements the goals and policies of the Butte County General Plan by regulating the uses of the land and structures within the County. The zoning designation of the project site and their intended use are as follows: Very Low Density Residential (VLDR 1.0) The purpose of the Very Low Density Residential (VLDR) zone is to allow for single-family homes and related uses in residential neighborhoods within the county. Standards for the VLDR zone are intended to preserve and protect the character of existing neighborhoods and ensure that future rural residential development provide an appropriate transition from rural to more developed areas. Permitted residential uses in the VLDR zone include a single-family home, small residential care home, secondary units, animal grazing, on-site agricultural product sales, and private stables. The VLDR zone also conditionally permits non-residential uses compatible with a residential setting, including public and quasi-public uses, golf courses, park and recreational facilities, personal services, animal-keeping, and medical offices and clinics. The minimum permitted parcel size in the VLDR zone is one acre. The VLDR zone implements the Very Low Density Residential land use designation in the General Plan. Clustered Development (Chapter 24, Article III, Division 8 of Butte County Code) The purpose of clustered development is to facilitate the retention of natural resources, open space (a minimum of 40 percent of the total project site must be dedicated as permanent open space to qualify as a Clustered Development), and wildlife habitat; avoid hazardous areas; and further implement the goals and policies of the General Plan. Specific objectives of these provisions are to: A. Provide an incentive to create quality residential developments, particularly where special conditions exist that prevent the attainment of the maximum permitted density of a property that could otherwise be attained through conventional subdivision design; B. Require the preservation of environmentally sensitive areas (e.g., wetlands and special-status species habitat), productive agricultural and timber lands, and important cultural and scenic resources; C. Facilitate innovative development concepts that achieve greater consistency with the Butte County General Plan; D. Provide permanent open space for a variety of natural resource purposes; E. Preclude additional development that may conflict with neighborhood quality of life; F. Provide increased open space which may include active and passive recreation features that reduce demand for public park land; and G. Reduce infrastructure requirements by reducing the length of streets and water and sewer lines and by potentially reducing street width requirements. Clustered development is allowed as an alternative to conventional subdivision design in a number of residential zones in Butte County, including the VLDR zone. Clustered Development subdivisions are subject to all of the requirements of the State Subdivision Map Act and the Butte County Subdivision Ordinance (Chapter 20 of Butte County Code). A Conditional Use Permit, Planned Development, or rezoning application is not required to utilize the clustered development provisions. Impact Discussion: a.) No impact. The project site is generally considered a part of the Stanley Avenue area of unincorporated West Chico. The proposed project will not physically divide an established community, instead it will build out identified residentially zoned properties, consistent with the General Plan zoning designations and will be generally consistent with average parcel size (0.9 acres) in the surrounding Very Low Density Zone. b.) Less than significant impact. The proposed project would subdivide the approximately18.5 acre property (two parcels) into 21 residential lots and one (1) open space lot. The project is proposed as a Clustered Development subdivision. Clustered Development Clustered development is allowed by the Butte County General Plan and Zoning Ordinance as an alternative to conventional subdivision design in the many zones, including VLDR. Clustered development projects may be proposed for parcels that could be subdivided based on the minimum parcel size specified in the applicable zone.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

As part of the process, the applicant met with the County to propose a clustered development project. They provided a tentative map that identified the residential lots, access road and the open space lot, which included the community wastewater area. The pre-application meeting discussed the proposed density of the project, which included 21 residential lots. Clustered development projects require a minimum of 40% of the parcel to be dedicated as open space. It also allows for additional density based on the percentage of the project area dedicated as open space. This project proposes 64.9% (12.02 acres/18.5 acres) of open space, which allows a maximum density increase of 15 percent. Based on the 18.5 acre parcel size, the 15 percent density increase would allow a total of 21 residential lots (18.5 x 1.15). The minimum lot size allowed in a clustered development project is 7,500 square feet. The final map will also include a note that identifies that the parcels cannot be further divided. The proposed project competed a pre- application review with the Butte County Environmental Health Division for wastewater and domestic water. The pre-application review determined there is adequate area for the community wastewater system. The project will be served by California Water Service. Areas within a 100-year flood zone are required to be avoided and reserved as permanent open space (BCC §24-90 (A.)(1.)). The proposed residential development and community wastewater areas are outside identified flood zones. The portions within the flood zone are located within the open space area. The open space area is restricted to the types of uses allowed as spelled out in Butte County Zone Code §24-90 G. Compatibility with Offsite Uses The project could create land use compatibility issues offsite which are governed by goals, policies and actions in Butte County General Plan and the Zoning Ordinance. Goal LU-13 - Plan for growth and protect agriculture in the Chico area through the Chico Area Greenline. Policy 13.4 – Allow residential land uses on the Agricultural Side of the Chico Greenline only within those areas designated for Very Low Density Residential and Rural Residential use on the Official Chico Area Greenline Map shown in Figure LU-7. The project site, and surrounding parcels to the north, west and east are zoned VLDR. The project is proposing a clustered development project in order to create a 300 foot residential setback from adjacent agriculturally designated land to the south. Goal AG-5 - Reduce conflicts between urban and agricultural uses and between habitat mitigation banking and agricultural uses. Policy Ag-P5.3.2 - The Zoning Ordinance shall require a setback between a new residence and an existing active orchard or vineyard that locates the residence as far away from the orchard or vineyard as practicable, taking into account adjacent agricultural uses and practices, provided it does not limit the density permitted by the residential zone, and in no case is less than 25 feet. Pursuant to the requirements of Butte County Code §24-56.1 (Residential Setback from Orchards and Vineyards), the Department of Development Services in conjunction with the Agricultural Commissioner’s Office is recommending a residential dwelling setback from adjacent active orchard (APN 039-370- 102) of 50 feet, or 25 feet with approved vegetation screen along the eastern property lines of parcels 13-18 and from the northern property line of parcel 11. Policy AG-P5.3.3 - The Zoning Ordinance shall require that a buffer be established pursuant to Policy AG- P5.3 on property proposed for residential development requiring discretionary approval in order to protect existing Williamson Act contracts (i.e. those contracts that are in effect at the time of adoption of this policy) from incompatible use conflicts. The desired standard shall be 300 feet, but may be adjusted to address unusual circumstances. As discussed above, General Plan Policy AG-P5.3.2 is implemented BCC §24-56.1 - Residential Setback from Orchards and Vineyards. Pursuant to the requirements of Butte County Code §24-56.1 (Residential Setback from Orchards and Vineyards), the Department of Development Services in conjunction with the Agricultural Commissioner’s Office is recommending a residential dwelling setback from adjacent orchard to the north (APN 039-390-085) of 50 feet, or 25 feet with approved vegetation screen. Policy 5.3.3 is implemented by Article 17 Agricultural Buffers of the Zoning Ordinance. A 300 - foot agricultural buffer setback to residences from lands in the Williamson Act to the south will be maintained by the proposed project.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

c.) No impact. The Butte Regional Conservation Plan (BRCP) is a joint Habitat Conservation Plan (HCP)/National Community Conservation Plan (NCCP) that is currently being prepared for the western half of the Butte County. The project site is located within the proposed plan area of the BRCP and within the Plan’s proposed Urban Permit Area for the Chico area. However, as the plan has not been adopted, the proposed project will not conflict, nor interfere with, the attainment of the goals of the proposed plan. Mitigation Measure: None required.

4.11 Mineral Resources:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Documen Incorporated t a. Result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state? b. Result in the loss of availability of a locally-important mineral resource recovery site delineated on a local general plan, specific plan, or other land use plan?

Setting Mining activities in Butte County focus on sand and gravel extraction, though other mineral resources have been extracted within the County. The majority of the County’s sand and gravel deposits occur along the Sacramento River and within a band running north to south down the center of the County. Gravel mining is most active in the central “gravel belt” which is the transitional region where sediments washed down from the Sierra Nevada into the Sacramento Valley’s slower moving rivers were deposited. These deposits are mined for sand and gravel to be used in combination with Portland cement or asphalt compounds for road construction, and for silica. The County’s designated mineral resource zones are identified by GPEIR Figure 4.6-5. Impact Discussion: a.) No impact. There are no known economically viable sources of rock materials in the immediate vicinity of the project site. No mining operations have occurred on the project site or surrounding area and the project would not preclude future extraction of available mineral resources. Mineral resource extraction is not proposed with this project. b.) No impact. The project site is not located in an area currently used for, or known to have, locally-important mineral resources. Mitigation Measure: None required.

4.12 Noise:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Documen Incorporated t a. Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b. Exposure of persons to or generation of excessive ground borne vibration or ground borne noise levels? c. A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project?

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d. A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? e. For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels?

f. For a project within the vicinity of a private airstrip, would the project expose people residing or working

in the project area to excessive noise levels?

Setting: The proposed project site is located in an area characterized by single-family residences in very low densities where low noise levels can be expected with the exception of noise from agricultural practices occurring in the vicinity. The nearest significant noise generator to the project site is likely the agricultural operation occurring south of Comanche Creek. Dayton Road also is likely to contribute to noise in the area. Sensitive receptors are located in proximity to the proposed project area. Table HS-2 of the Butte County General Plan identifies the maximum allowable noise exposure to a variety of land uses from transportation sources, including from roadways, rail and airports. In the case of transportation noise sources, exterior noise level standards for residential outdoor activity areas are 60 dB (Ldn/CNEL). However, where it is not possible to reduce noise in an outdoor activity area to 60 dB Ldn /CNEL or less using a practical application of the best- available noise-reduction measures, an exterior noise level of up to 65 dB may be allowed, the maximum allowable interior noise level standards for residential uses is 45 dB Ldn/CNEL, which is designed for sleep and speech protection. Table HS-3 identifies the maximum allowable noise exposure from non-transportation sources for urban and non- urban areas. The typical structural attenuation of a residence from an exterior noise is 15 dBA when windows facing the noise source are open. When windows in good condition are closed, the noise attenuation factor is around 20 dBA for an older structure and 25 dBA for a newer dwelling.

The Butte County Noise Control Ordinance provides the County with a means of assessing complaints of alleged noise violations and to address noise level violations from stationary sources. The ordinance includes a list of activities that are exempt from the provisions of the ordinance. Construction-related noise within 1,000 feet of residential uses are included among the exempted activities, provided construction activities do not take place at the following times:

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

 From sunset to sunrise on weekends and non-holidays;  Fridays commencing at 6:00 pm through and including 8:00 am on Saturday;  Before 8:00 am on holidays; and  Saturday commencing at 6:00 pm through and including 10:00 am on Sunday; and Sunday after 6:00 pm. Impact Discussion: a.) Less than significant impact. Noise levels contributed by the proposed project would include construction noise during future build-out of the resultant parcels, occupancy of the single-family residences, and potentially from activities allowed by the zone. Construction noises associated with development of the resultant parcel would primarily be from the use of heavy equipment, generators, and power tools. Typical operational noises contributed by residential uses include landscaping equipment, automobile traffic, power tools, domestic animals, heating and cooling systems, and audio equipment. Most of the noise generated by these activities would be intermittent and separated from noise sensitive receptors; and therefore, is unlikely to exceed County standards. Additionally, construction-related noise from on-site development would be temporary and intermittent, and would not result in long-term noise impacts. Compliance with Butte County Code provisions regarding construction noise would ensure construction activities occur during hours exempt from County noise standards, making potential impacts less than significant. b.) Less than significant impact. The use of blasting and/or pile drivers during construction activities would not be included as part of the proposed project. The proposed project would involve temporary sources of groundborne vibration and groundborne noise during construction from the operation of heavy equipment. Operation of heavy equipment would generate localized groundborne vibration and groundborne noise that could be perceptible at residences or other sensitive uses in the immediate vicinity of the construction site. However, since the duration of impact would be infrequent and would occur during less sensitive daytime hours (i.e., between 7:00 a.m. and 7:00 p.m.), the impact from construction-related groundborne vibration and groundborne noise would be less than significant. c.) Less than significant impact. The primary contributors to the existing noise environment surrounding the project site include motor vehicle traffic along area roadways, residential uses, agricultural operations, and naturally occurring sources. The only permanent noise source that would be introduced to the existing noise environment by the proposed project would be typical noise levels contributed by single-family residential land uses including automobiles, landscaping equipment, power tools, domestic animals, heating and cooling systems, and audio equipment. It is anticipated that these introduced sources of noise would likely result in increases to the ambient noise levels within the project site and vicinity. However, due to the low ambient noise presently in the surrounding environment, and the density of the proposed parcels and surrounding area, a potential increase in ambient noise levels would not be substantial. d.) Less than significant impact. The only temporary or periodic noise sources that would be introduced to the existing noise environment by the proposed project would be noises associated with construction activities. During the construction period, noise levels generated by project construction would vary depending on the particular type, number, and duration of use of the various types of construction equipment. Though noises generated by heavy equipment would periodically generate noise levels in excess of exterior noise standards identified in the General Plan, given the minimal development anticipated to build-out the resultant parcels, the infrequent use of heavy equipment during construction, and that construction activities would occur during less sensitive daytime hours, temporary noise impacts are not considered significant. e.) No impact. The Chico Municipal Airport is located approximately 5.75 miles north from the project site, and is situated outside the Airport Land Use Compatibility Zones for the airport. At this distance, the project site is located outside the 55 dB CNEL noise level established for the airport. As a result, operational noises from the airport would not affect residents located on the project site. Ranchaero Airport is located approximately 1.6 miles to the northwest of the project site. The proposed project is within the airport’s compatibility Zone D which is an area included in the vicinity of the airport that is overflown less frequently or at a higher altitude by arriving or departing aircraft. The project site is located outside the 55 dB CNEL noise level established for the airport. As a result, noise impacts associated with the airport operations are not anticipated to affect people working or residing within the project site. f.) Less than significant impact. No private airports have been identified to be located within the vicinity of the project site. As a result, noise impacts associated with private airstrip operations are not anticipated to affect people working or residing within the project site.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Mitigation Measure: None required.

4.13 Population and Housing:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Documen Incorporated t a. Induce substantial population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? b. Displace substantial numbers of existing housing, necessitating the construction of replacement housing elsewhere? c. Displace substantial numbers of people, necessitating the construction of replacement housing elsewhere?

Setting: The population for Butte County was estimated to be 225,411 in 2015, approximately 220,024 in 2010 and 203,446 in 2000, resulting in a total population growth of 21,965 during this 15-year period (US Census). The annual average population growth rate in the county during the 2000-2015 time period was approximately 0.65 percent. The total housing units in Butte County was approximately 98,035 in July of 2015. The proposed project would result in the creation of 20 additional residential parcels that could potentially be developed with a single-family residence and potentially a second unit as allowed in the VLDR zone. According to the United States Census Bureau, the average household size of an owner-occupied housing unit for Butte County is 2.43. Based on the average household size within the county, and the potential number of housing units that could be constructed within the project site, the proposed project could add approximately 48 new residents to the local population. Impact Discussion: a.) Less than significant impact. Subdivision of the project site could facilitate the potential addition of 20 single- family residential units, which would directly result in growth in available housing and, if occupied, to the local population. However, housing and population growth with this project are consistent with planned future land uses and would be minor in scale. Construction activities associated with development of the residential units would not result in any direct or indirect growth-inducing impacts to the county because construction activities would be temporary, and construction workers would likely be drawn from the local and regional work force. Growth in the project area resulting from the project is planned, and is consistent with the applicable planning policies and zoning ordinance. b.) No impact. The project site currently includes one single-family residential unit. The proposed project would not require the existing unit to be removed or relocated from the project site. Therefore, the project would not result in the displacement of substantial numbers of people or housing. c.) No impact. The proposed project would not cause the displacement of the local population. Mitigation Measure: None required.

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4.14 Public Services:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Documen Incorporated t a. Would the project result in substantial adverse physical impacts associated with the provision of or need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times, or other performance objectives for any of the public services: 1. Fire protection?

2. Police Protection?

3. Schools?

4. Parks?

5. Other public services?

Setting The General Plan reflects Butte County’s commitment to provide needed public services, infrastructure and facilities that are accessible to and benefit all county residents. Applicants pay adopted fee(s) at the time of building permit to pay a proportionate share of fire, police, school, parks, and other governmental services. Fire Protection The Butte County Fire Department (BCFD) and the California Department of Forestry and Fire Protection (CALFIRE) provide fire and emergency services to the entire unincorporated county population, protecting over 1,600 square miles, with the exceptions of the Cities of Chico and Oroville, the Town of Paradise and the El Medio Fire Protection District. Services include the following; fire control for structural, vegetation, vehicular and other unwanted fires, emergency medical services and rescue response, hazardous materials response, flood control assistance, public safety education, vegetation management, and fire law enforcement/arson investigation. Sheriff Services The Butte County Sheriff’s Office is responsible for law enforcement, criminal investigation, and crime prevention in the unincorporated areas of Butte County. Schools/Public Education The County Office of Education, Butte Community College, California State University, Chico and local school districts provide public education in Butte County. The local school districts provide elementary and secondary education to the municipalities and unincorporated areas of the county, while the Office of Education offers special education programs and other related services to the individual districts within the county. Butte Community College is a two-year junior college and California State University, Chico is a four-year university. School districts can be found on Figure PUB-1 of the General Plan. Parks A wide variety of recreational facilities are found in Butte County, offering a variety of recreational opportunities to residents and visitors. Federal, State, and local recreation lands are depicted in Figure PUB-2 of the General Plan.

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Solid Waste The Butte County Public Works Department assumed the daily operational responsibility of the Neal Road Landfill Facility in 2003. The Neal Road Landfill is permitted to accept municipal solid waste, inert industrial waste, demolition materials, and special wastes containing non-friable asbestos and septage. Current projections suggest the landfill has the operational capacity to last through 2034. General Governmental Services Butte County provides a wide variety of mandated services to resident of both incorporated and unincorporated areas with the county. Services include behavioral health services, public health services, supportive services, social services, veterans’ services, among many more. Impact Discussion: a1.) Less than significant impact. Butte County Code requires the payment of fire protection impact fees to help offset the impacts that new residential development has on the fire protection services. Fire protection impact fees would be paid at the time of building permit issuance for a dwelling unit. a2.) Less than significant impact. The Butte County Sheriff’s Office provides law enforcement service to the site. Implementation of the proposed project could increase service calls if additional residential structures are built. Increased development in unincorporated areas of Butte County impacts the ability of the Sheriff's Department to adequately provide services to outlying areas. Although police protection services may need to be increased as a result of the project, it is anticipated that project implementation would not require any new law enforcement facilities or the alteration of existing facilities to maintain acceptable performance objectives. Increased demand for law enforcement facilities (sub-stations, jail etc.) would be partially offset through project-related impact fees collected at the issuance of building permits. a3.) Less than significant impact. Residential development at the site would result in an incremental demand for school facilities in the area. The project site is located in the Chico Unified School District. The statewide average student yield factors are 0.7 students per dwelling unit for a Unified School District (California Department of General Services). Development of the proposed project could generate a student population increase of approximately 14 students for the Chico Unified School District. A development impact fee for school facilities will be assessed at the time of residential development on the resultant parcels to offset any potential impact to area school facilities. The fee amount will be determined and calculated as of the date of application for the building permits. While school districts maintain that these fees do not fully mitigate the impacts of the project, the County is precluded from imposing additional fees or mitigation by state legislation. a4.) Less than significant impact. See discussion 4.15 – Recreation. a5.) Less than significant impact. The project would result in added need for County services, such as law enforcement, fire protection, general services, libraries, and roads. Butte County collects various types of development impact fees to offset the cost and impacts associated with new residential units. These fees vary depending on the dwelling type, and are collected at the time of development. Mitigation Measure: None required.

4.15 Recreation:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated?

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b. Include recreational facilities or require the construction or expansion of recreational facilities which might have an adverse physical effect on the environment?

Setting The project site is located within the Chico Area Recreation District (CARD). The district covers an area of 255 square miles, and includes the City of Chico, as well as unincorporated area in Butte County. The district operates and maintains approximately 93 acres of developed parkland including Community Park, Hooker Oak Park, DeGarmo Park, and a variety of additional facilities. The nearest park facility is the Comanche Creek Greenway in Chico, located approximately 1.2 miles east of the project site. Impact Discussion: a.) Less than significant impact. Increase in the demand for recreational facilities is typically associated with substantial increases in population. As discussed in Section 4.13 - Population and Housing, the proposed project will generate minimal growth in the local population when residential units are constructed on the resultant parcels. In addition to CARD facilities, the proposed project may result in a less than significant increase in use of City of Chico parks and recreational facilities including Bidwell Park. Because housing and population growth in the project area would be minor, approximately 48 new residents, the project would not result in a substantial increase in demand for recreational facilities or adversely affect Butte County park/population standards. The collection of impact fees as part of residential development helps offset the increase in usage of parks and other recreational facilities caused by the project. b.) No impact. The proposed project does not include plans for additional recreational facilities nor would it require expansion of existing recreational facilities. Therefore, the proposed project would not result in any adverse physical effects on the environment from construction or expansion of recreational facilities. Mitigation Measure: None required.

4.16 Transportation/Traffic:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Documen Incorporated t a. Conflict with an applicable plan, ordinance or policy establishing measures of effectiveness for the performance of the circulation system, taking into account all modes of transportation including mass transit and non-motorized travel and relevant components of the circulation system, including but not limited to intersections, streets, highways and freeways, pedestrian and bicycle paths, and mass transit? b. Conflict with an applicable congestion management program, including, but not limited to level of service standards and travel demand measures, or other standards established by the county congestion management agency for designated roads or highways? c. Result in a change in air traffic patterns, including either an increase in traffic levels or a change in location that results in substantial safety risks? d. Substantially increase hazards due to a design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? e. Result in inadequate emergency access?

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f. Conflict with adopted policies, plans, or programs regarding public transit, bicycle, or pedestrian facilities, or otherwise decrease the performance or safety of such facilities

Setting: Access to the project site is provided by Stanley Avenue, a County-maintained, two-lane local road that extends from Dayton Road to Diamond Avenue. The road is approximately 16 feet wide with an asphalt surface. No paved shoulders or roadside drainage swales are located on either side of the roadway near the project site. The average daily vehicle trips along the road are likely minimal, and the road has a stable traffic flow. Impact Discussion: a.) Less than significant impact. The proposed project has the potential to introduce 20 single-family residences, as well as accessory uses to the planned residences, which would generate long-term changes in traffic volumes. Vehicle traffic for a single-family residence is estimated to be 9.43 vehicle trips per day during weekdays (Institute of Transportation Engineers, 9th edition). While the development of the proposed project would generate approximately 198 daily trips, these trips would be spread out over the course of the day and be distributed throughout the local roadway network. A Traffic Impact Study was completed to assess the potential impacts on local roadways and intersections associated with development of the proposed project. The Traffic Impact Study described existing traffic conditions, quantify traffic volumes generated by the proposed project, identify potential impacts on all modes of travel, document findings, and make recommendations to mitigate impacts, if any are found. Table 4.16.1: Estimated Trip Generation for the proposed project.

Daily AM Peak Hour PM Peak Hour Land Use/Units Trips Trips In Out Trips In Out

Single Family Homes/ 21 units 198 16 3 8 21 9 6

With the addition of project traffic, the Dayton Road/Stanley Avenue intersection is projected to operate at acceptable level of service conditions (LOS “B” or better) under “Existing Plus Project” conditions during both the AM and PM peak hours. Additionally, Stanley Lane and the Stanley Lane/Street A project intersection will operate at acceptable level of service conditions (LOS “A”) under “Existing Plus Project” conditions. No notable traffic operation impacts are anticipated with the project. Construction activities associated with the future development of the resultant parcels has the potential to generate short-term changes to traffic volumes on the project area road network. Daily vehicle trips would be generated with the arrival and departure of construction workers. Heavy truck trips would be required for hauling equipment and materials to and from the construction site. Any future construction activities would be small-scale and of short- duration. As a result, the proposed project would not cause long-term degradation in, or create substantial impacts to, the operating conditions or level of service on any of the roadways in the project area. Stanley Avenue has a relatively narrow paved width (16 feet at the narrowest but typically 17 to 18 feet) which is less than the 20 foot minimum roadway width recommended in A Policy on Geometric Design of Highways and Streets (2004) published by the American Association of State Highway and Transportation Officials (AASHTO) and narrower than Butte County standards for new County roadways. Because the scope of the proposed project is relatively minor and would not result in construction of a substantial number of residential units, the increase in traffic levels would not create substantial impacts to operating conditions of the area road network. To provide a safe and efficient roadway with increased traffic, the applicant will provide a proportionate cost sharing contribution for widening of the pavement section on Stanley Avenue to a 20 foot width from Dayton Road to the project entry point. If the applicant is required to physically construct widening improvements in a dollar amount equal to the proportionate share, in lieu of paying the fee, the traffic study recommended that the widening begin at Dayton Road and move east to the extent possible with the fee amount. The greatest widening benefit will be realized where traffic volumes are the highest, which is closest to Dayton Road.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 b.) Less than significant impact. See discussion 4.16(a) - Transportation/Traffic. c.) No impact. No public commercial use airports have been identified to be located within the vicinity of the project site. Ranchaero Airport, is located approximately 1.6 miles to the northwest of the proposed project site, serves a combination of recreational, flight training, agricultural, and limited business functions. The proposed project is located within compatibility zone D for Ranchaero Airport, however, compatibility zone D is an area included in the vicinity of the airport that is overflown less frequently or at a higher altitude by arriving or departing aircraft. Compatibility zone D does not have any restrictions to lot sizes or density. Additionally, the length of the runway at Ranchaero Airport limits its use to single-engine airplanes and helicopters. Therefore, the proposed project would not result in a change in air traffic patterns, including increase air traffic levels or safety hazards. d.) Less than significant impact. The proposed project would not change the configuration (alignment) of area roadways, and would not introduce types of vehicles that are not already traveling on area roads. However, construction of access roads or driveways to the resultant parcels may require encroachment improvements to the frontage road. Future encroachments to a county roadway would be designed and constructed in accordance with a Butte County Public Works Encroachment Permit, which would ensure that any potential safety and compatibility issues are addressed. e.) Less than significant impact. Resultant parcels would access Stanley Avenue via a County-maintained road to be constructed with approval of the proposed project. Maintenance costs of the new road would be covered by the formation of a Permanent Road Division Area of Benefit. The proposed new road would be designed and constructed to meet all applicable State and local development standards, ensuring that access is adequate to provide emergency ingress and egress. f.) Less than significant impact. No existing or proposed bicycle or pedestrian facilities are located on, or in the vicinity of, the project site. Future development on the resultant parcels would have minor long-term impacts on alternative transportation facilities due to the limited population growth to the project area. Construction activities associated with future development may generate short-term disruption to area roadways from an anticipated increase in traffic levels that may affect alternative transportation uses. However, construction activities associated with the proposed project would be temporary, and in compliance with a Butte County Encroachment Permit, which would require traffic control implementation, if needed. Mitigation Measure: None required.

4.17 Tribal Cultural Resources:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code section 5020.1(k) or b. A resource determined by the lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code section 5024.1. In apply the criteria set forth in subdivision (c) of the Public Resources Code section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe.

Setting: Butte County contains a rich diversity of archaeological, prehistoric and historical resources. The General Plan 2030 EIR observes that the “archaeological sensitivity of Butte County is generally considered high, particularly in areas near water sources or on terraces along water courses” (Butte County General Plan EIR, 2010, p. 4.5-7).

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A substantial adverse change upon a historically significant resource would be one wherein the resource is demolished or materially altered so that it no longer conveys its historic or cultural significance in such a way that justifies its inclusion in the California Register of Historical Resources or such a local register (CEQA Guidelines Section 15064.5, subd. (b)(2)). Cultural resources include prehistoric and historic period archaeological sites; historical features, such as rock walls, water ditches and flumes, and cemeteries; and architectural features. Cultural resources consist of any human-made site, object (i.e., artifact), or feature that defines and illuminates our past. Often such sites are found in foothill areas, areas with high bluffs, rock outcroppings, areas overlooking deer migratory corridors, or near bodies of water. A record search for existing archeological sites and surveys on the project site, and within one-quarter mile, was conducted through the Northeast Information Center (NEIC) of the California Historical Resources Information System on September 7, 2016. Additionally, an intensive pedestrian survey was conducted within the entire project area by Ms. Mary Bailey of Golden Hills Consulting. The record search did not have any listing of any historic properties eligible for either the State or Federal Registers of Historic Places within the project area or the one-quarter mile search radius. Additionally, there are no recorded cultural resources listed with the NEIC within the project area or one-quarter mile radius. However, two prehistoric sites have been recorded within two miles of the project site including the Patrick Rancheria, a Mechoopda village site, and a habitation site with flaked and ground stone plus fire cracked rock. Additionally, there are nine historic resources within a 1.5-mile radius of the project including The Junction, Chico Soda Works, an agricultural school dairy residence and blacksmith shop, Chico MGP Generator Building, Calwater’s water tower and tank, Joe’s Bar, the Wright-Patrick House, and a refuse deposit. The pedestrian survey conducted on September 26, 2016 involved walking transects spaced approximately 10-15 meters throughout the site. The ground surface was largely obscured due to the presence of recently mowed vegetation, small areas were boot-scuffed approximately every 30-50 meters along each transect to examine the ground surface. Areas of exposed dirt including gopher mounds and back-filled percolation test pits were closely examined. Two small manos (hand stones) were discovered in fairly close proximity to each other. The manos are considered lithic isolates and are not considered eligible for either the National or California Register of Historic Places. No other artifacts were discovered within the project site. Impact Discussion: a-b.) Less than significant impact with mitigations incorporated. As part of the processing of the project application, County staff initiated a Tribal Consultation Request with tribes that have requested Formal notification of proposed projects within their geographic area of traditional and cultural affiliation per AB 52 Notification Request, Public Resources Code Section 21080.3(b). The County received two responses, one from the Enterprise Rancheria indicating that the project site was not in the aboriginal territory of the Estom Yumeka Maidu and a second response from the Mechoopda Indian Rancheria indicating that the Tribe did not have current records of significance for the project site. In addition, as part of the preparation of the CRI, a sacred lands file request and Native American Consultation was conducted. Consultation letters were sent to seven tribes on October 17, 2016 with follow-up emails and phone calls; two responses were received with no concerns. No other cultural resources were identified within the project site or immediate. See mitigation measures #9-12 in Section 4.5 (a-d) – Cultural Resources.

4.18 Utilities and Service Systems:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Document Incorporated a. Exceed wastewater treatment requirements of the applicable Regional Water Quality Control Board? b. Require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? c. Require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects?

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d. Have sufficient water supplies available to serve the project from existing entitlements and resources, or are new or expanded entitlements needed? e. Result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the

project’s projected demand in addition to the provider’s existing commitments? f. Be served by a landfill with sufficient permitted capacity to accommodate the project’s solid waste disposal needs? g. Comply with federal, state, and local statutes, and regulations related to solid waste?

Impact Discussion: a.) Less than significant impact. The project proposes a community wastewater system, a septic tank effluent pump (STEP) system where an individual septic tank equipped with an effluent pump to a common dose tank via a common pressure main. The pressure line and service connection (shutoff valve, check valve and valve box) will be installed for a lot at the time of other utilities and subdivision improvements. The wastewater disposal area will be located on the open space parcel (Lot A). b.) Less than significant impact. See discussion 4.17(a) – Utilities and Service Systems. c.) Less than significant impact. The project site is located outside planned drainage areas, and no existing on- site storm water drainage facilities are located on the project site. All resultant parcels are at least one acre in size, which provides sufficient areas on the property to detain storm water runoff on the resultant parcels. Future development and improvements on the resultant parcels would be reviewed by Butte County Public Works, and appropriate on- site storm drainage facilities would be constructed that will ensure that no net increase in peak flow runoff above pre-development levels leaves the property. Any future storm runoff facilities would be construction to the County’s improvement standards, which will ensure that impacts created with the creation of new facilities, or expansion of existing facilities, would not cause significant adverse effects to the environment. d.) Less than significant impact. Domestic water to existing and planned uses on the resultant parcels would be provided an extension of the Cal Water’s water distribution network located along Stanley Avenue. Cal Water has the operational capacity to serve the proposed project and existing groundwater supplies are anticipated to be available to the serve the proposed project, and no additional or expanded entitlements are required. e.) No impact. See discussion 4.17(a) – Utilities and Service Systems. f.) Less than significant impact. Future development of the resultant parcels would result in a minor increase in the stream of waste being deposited in the Neal Road Recycling and Waste Facility. The California Integrated Waste Management Board estimates that a typical residential household generates 10.12 pounds of solid waste per day (4.4 pounds per person per day x average household size). The Neal Road Facility has a maximum permitted throughput of 1,500 tons per day, and an estimated current daily average throughout of 500 tons per day. Therefore, the facility would have adequate capacity to accommodate solid waste generated by the project. g.) Less than significant impact. See discussion 4.17(f) – Utilities and Service Systems. Mitigation Measure: None required.

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4.19 Mandatory Findings of Significance:

Would the proposal: Potentially Less Than Less Than No Reviewed Significant Significant Significant Impact Under Impact with Impact Previous Mitigation Documen Incorporated t a. Have the potential to substantially degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? b. Have impacts that are individually limited, but cumulatively considerable? (“Cumulatively considerable” means that the incremental effects of a project are considerable when viewed in connection

with the effects of past projects, the effects of other current projects and the effects of probable future projects)? c. Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly?

Impact Discussion: a.) Less than significant impact with mitigation incorporated. With the implementation of mitigation measures included in this Initial Study, the proposed project would not degrade the quality of the environment; result in an adverse impact on fish, wildlife, or plant species including special status species, or prehistoric or historic cultural resources. Prehistoric or historic cultural resources would not be adversely affected because no archeological or historic resources are known to exist in the project area and project implementation includes following appropriate procedures for avoiding or preserving artifacts or human remains should they be uncovered during project excavation. b.) Less than significant impact with mitigation incorporated. This project has the potential to contribute impacts that are individually limited, but cumulatively considerable with respect to Air Quality, Biological Resources, Cultural Resources, and Greenhouse Gas Emissions. Cumulative impacts to these areas would be mitigated due to the inclusion of the Mitigation Measures listed below, as itemized under Section 5 – Mitigation Measures and Monitoring Requirements. Past, current, and probable future projects in the vicinity of the project site were reviewed to determine if any additional cumulative impacts may occur with the approval of this project. A two-mile radius was used in determining cumulative impacts. No additional cumulative impacts were discovered. c.) Less than significant impact with mitigation incorporated. There have been no impacts discovered through the review of this application demonstrating that there would be substantial adverse effects on human beings either directly or indirectly. However, the proposed project has the potential to cause both temporary and future impacts to the area by project-related impacts relating to air quality, biological resources, cultural resources, and greenhouse gas emissions. With implementation of mitigation measures included in this Initial Study, these impacts would be effectively mitigated to a less than significant level.

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5.0 Mitigation Measures and Monitoring Requirements Mitigation Measure #1 (Construction Air Emissions) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “The following best practice measures to reduce impacts to air quality shall be incorporated by the project applicant, subject property owners, or third-party contractors during construction activities on the project site. These measures are intended to reduce criteria air pollutants that may originate from the site during the course of land clearing and other construction operations. Diesel PM Exhaust from Construction Equipment and Commercial On-Road Vehicles Greater than 10,000 Pounds  All on- and off-road equipment shall not idle for more than five minutes. Signs shall be posted in the designated queuing areas and/or job sites to remind drivers and operators of the five-minute idling limit.  Idling, staging and queuing of diesel equipment within 1,000 feet of sensitive receptors is prohibited.  All construction equipment shall be maintained in proper tune according to the manufacturer’s specifications. Equipment must be checked by a certified mechanic and determined to be running in proper condition before the start of work.  Install diesel particulate filters or implement other CARB-verified diesel emission control strategies.  Shall not operate a diesel-fueled auxiliary power system (APS) to power a heater, air conditioner, or any ancillary equipment on that vehicle during sleeping or resting in a sleeper berth for greater than 5 minutes at any location when within 100 feet of a restricted areas.  To the extent feasible, truck trips shall be scheduled during non-peak hours to reduce perk hour emissions. Operational TAC Emissions  All mobile and stationary Toxic Air Contaminants (TACs) sources shall comply with applicable Airborne Toxic Control Measures (ATCMs) promulgated by the CARB throughout the life of the project (see http://www.arb.ca.gov/toxics/atcm/atcm.htm).  Stationary sources shall comply with applicable District rules and regulations. Fugitive Dust Construction activities can generate fugitive dust that can be a nuisance to local residents and businesses near a construction site. Dust complaints could result in a violation of the District’s “Nuisance” and “Fugitive Dust” Rules 200 and 205, respectively. The following is a list of measures that may be required throughout the duration of the construction activities:  Reduce the amount of the disturbed area where possible.  Use of water trucks or sprinkler systems in sufficient quantities to prevent airborne dust from leaving the site. An adequate water supply source must be identified. Increased watering frequency would be required whenever wind speeds exceed 15 mph. Reclaimed (non-potable) water should be used whenever possible.  All dirt stockpile areas should be sprayed daily as needed, covered, or a District approved alternative method will be used.  Permanent dust control measures identified in the approved project revegetation and landscape plans should be implemented as soon as possible following completion of any soil disturbing activities.  Exposed ground areas that will be reworked at dates greater than one month after initial grading should be sown with a fast-germinating non-invasive grass seed and watered until vegetation is established.  All disturbed soil areas not subject to re-vegetation should be stabilized using approved chemical soil binders, jute netting, or other methods approved in advance by the Butte County Air Quality Management District.  All roadways, driveways, sidewalks, etc. to be paved should be completed as soon as possible. In addition, building pads should be laid as soon as possible after grading unless seeding or soil binders are used.  Vehicle speed for all construction vehicles shall not exceed 15 mph on any unpaved surface at the construction site.  All trucks hauling dirt, sand, soil, or other loose materials are to be covered or should maintain at least two feet of freeboard (minimum vertical distance between top of load and top of trailer) in accordance with local regulations.  Install wheel washers where vehicles enter and exit unpaved roads onto streets, or wash off trucks and equipment leaving the site.  Sweep streets at the end of each day if visible soil material is carried onto adjacent paved roads. Water sweepers with reclaimed water should be used where feasible.

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 Post a sign in prominent location visible to the public with the telephone numbers of the contractor and the Butte County Air Quality Management District - (530) 332-9400 for any questions or concerns about dust from the project.” All fugitive dust mitigation measures required should be shown on grading and building plans. In addition, the contractor or builder should designate a person or persons to monitor the dust control program and to order increased watering, as necessary, to prevent transport of dust offsite. Their duties shall include holidays and weekend period when work may not be in progress. The name and telephone number of such persons shall be provided to the District prior to land use clearance for map recordation and finished grading of the area. Please note that violations of District Regulations are enforceable under the provisions of California Health and Safety Code Section 42400, which provides for civil or criminal penalties of up to $25,000 per violation. Plan Requirements: The note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. This note shall also be placed on all building and site development plans. Timing: Requirements of the condition shall be adhered to throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Building inspectors shall spot check and shall ensure compliance on-site. Butte County Air Pollution Control District inspectors shall respond to nuisance complaints.

Mitigation Measure #2 (Valley Elderberry Longhorn Beetle) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to construction activities in any areas within potential valley elderberry longhorn beetle habitat, a qualified biologist shall flag, fence, or by other highly visible means identify buffer zones at least 20 feet wide surrounding the drip line of blue elderberry (Sambucus nigra ssp. caerulea) with at least one stem with a diameter at ground level of one inch or greater. The visibly defined buffer zones shall be maintained throughout the duration of construction.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Mitigation Measure #4 (Northwestern Pond Turtle) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “If a northwestern pond turtle is observed in the project area during construction activities, the contractor will temporarily halt construction until the turtle has moved itself to a safe location outside the construction limits. If construction is to occur during the nesting season (late June-July), a pre-construction survey will be conducted by a qualified biologist to locate any northwestern pond turtles or their nests. This survey will be conducted within 500 feet of Comanche Creek no more than two days prior to the start of construction. If a pond turtle nest is located, the biologist will flag the site and determine whether construction activities can avoid affecting the nest. If the nest cannot be avoided, a no-disturbance buffer zone will be established around the nest in coordination with CDFW. The no- disturbance buffer will remain in place until the young have left the nest.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

Mitigation Measure #5 (Western Red Bat) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to the start of construction activities, a survey for roosting bats or maternity roosts shall be conducted by a qualified biologist. The survey shall be performed within seven days prior to the initiation of construction adjacent to areas of appropriate roosting habitat. Accessible areas shall be surveyed during the appropriate time of day to maximize detectability of the species. The survey shall include the areas within 250 feet of the work area. If an active roost is found, no disturbance buffers will be established around the roost. The buffer will be 100 feet for a roost and 250 feet for a maternity roost, the limits of the work area will be clearly marked and a qualified biologist will be retained to monitor construction activities within the vicinity of the roost or maternity roost. If buffer reductions are requested and approved by CDFW, a monthly report shall be submitted to CDFW with information regarding monitoring results and reports will be submitted for the duration of construction activities within buffer areas.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

2. Establish a 250 feet no-disturbance buffer around all active nests; in the event bald eagles are found nesting in the survey area, a 1,000 foot no disturbance buffer shall be established; 3. Within 2 working days of the survey, prepare a report and submit to the County. The report will include the results of survey, location(s) of nests, and location of no disturbance buffers; 4. On-going weekly surveys shall be conducted to ensure that the no disturbance buffer is maintained; and 5. Construction can resume when a qualified biologist has confirmed that the nest is no longer active.” Plan Requirements: The above-referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities, including road construction, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

Mitigation Measure #7 (Swainson’s Hawk) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Any ground disturbance or vegetation removal within the project area should be conducted during the non- breeding season (September 16 through February 28). If construction activities occur during the breeding season (March 1-September 15) then a pre-construction raptor survey will be conducted by a qualified biologist to identify any active Swainson’s hawk nests within and in the vicinity of the BSA. The pre-construction survey will take place in accessible areas within a 0.5-mile radius of the area where construction activities would occur. The required survey radius may be reduced on a case-by-case basis if approved by CDFW, but in no case will be less than 500 feet. At least one survey will be conducted no more than one week prior to the initiation of construction. If no active nests are located, no further measures are necessary to avoid impacts to Swainson’s hawk nests. If active nests are identified, the following measures will be implemented: 1. A no-disturbance buffer zone will be established around the nest. The width of the buffer will be determined by a qualified biologist in coordination with CDFW. Determination of the required width will consider the distance of the nest from construction activities, existing level of disturbance, etc. 2. A qualified biologist will monitor active nests within 500 feet (or the width of the buffer zone) of construction activities. The first monitoring event will coincide with the initial implementation of construction activities and monitoring will continue at least once a week until the young have fledged. If the biologist determines that construction is disturbing the birds and nest failure is possible, CDFW will be notified immediately. Measures to avoid nest failure will be implemented in coordination with CDFW and may include halting some or all construction activities until the young have fledged. For monitored nest sites, a monitoring report will be submitted to CDFW within two weeks after termination of monitoring activities.” Plan Requirements: The above referenced mitigation shall be placed on a separate document which is to be recorded concurrently with the final map or an additional map sheet. Timing: Requirements of the condition shall be adhered to prior to construction activities. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

■ Butte County Department of Development Services ■ ■ Initial Study – TSM17-0001 (Leen) ■ Page 70 of 76 ■

Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Plan Requirements: A 50-foot building setback area shall be established around riparian woodlands on the project site and delineated on a separate document recorded concurrently with the final map, together with the mitigation measure. Timing: Requirements of the condition shall be adhered to prior to Tentative Subdivision Map recording and prior to construction activities, and throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. The Department of Development Services shall ensure the condition is met at the time of development and during construction activities.

Mitigation Measure #9 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to any ground disturbance the developer shall arrange to have a qualified archaeologist conduct a minimum of four shovel pit tests within the boundaries of Parcels 2 and 3. The Mechoopda Tribe shall be notified of the time and date of the shovel pit testing to provide the opportunity to monitor excavation. Soil from the shovel test pits shall be screened through standard quarter inch mesh (hardware cloth). The results of the shovel pit tests will be reported to County Planning staff by the qualified archaeologist. If no subsurface evidence of prehistoric cultural resources is located, no additional mitigation is necessary under this measure. Should any prehistoric cultural resources be located, additional consultation with the Mechoopda Tribe, to determine the appropriate steps for recordation and recovery, shall occur before any construction related ground disturbance.” Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet and shall be shown on all site development and building plans. Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to avoid damage to cultural resources and determine appropriate action.

Mitigation Measure #10 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Prior to development on the resultant parcels, subsurface investigations shall take place. The property owner shall retain a qualified archaeologist to conduct the subsurface investigation. The investigation will consist of up to two shovel test pits per parcel. Soil from the shovel test pits will be screened through standard one-quarter inch mesh (hardware cloth). The Mechoopda Tribe will be notified to provide the opportunity to monitor excavation of the shovel test pits. Should any prehistoric cultural resources be located, the qualified archaeologist and the Mechoopda Tribe will determine the appropriate steps for recordation and recovery, prior to further ground disturbance. If no subsurface evidence of prehistoric cultural resources is located, no additional mitigation is necessary.” Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet and shall be shown on all site development and building plans. Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to ensure subsurface investigations are performed prior to development on resultant parcels. Mitigation Measure #11 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “Should site development activities reveal the presence of prehistoric cultural resources (freshwater shells, beads, bone tool remnants, lithic materials, tools or grinding rocks, etc.) or historic cultural resources (structural remains, refuse deposits, bottle dumps, etc.) the supervising contractor shall cease all work within the area of the find and notify County Planning staff. A qualified archaeologist shall be retained by the property owner to evaluate the significance of the find. Further, the Mechoopda Tribe will be notified to provide the opportunity to monitor evaluation of the find. Site work shall not resume until the qualified archaeologist conducts sufficient research, testing and analysis of the archaeological

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 evidence to make a determination that the resource is either not cultural in origin or determine the appropriate steps for recordation and recovery, including recommendations for total data recovery, Tribal monitoring, deposition protocol, or avoidance, if applicable. All measures deemed appropriate by County Planning staff shall be implemented pursuant to the terms of the qualified archaeologists report.”

Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet and shall be shown on all site development and building plans. Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to avoid damage to cultural resources and determine appropriate action. Mitigation Measure #12 (Cultural Resources) Place a note on a separate document which is to be recorded concurrently with the map or on an additional map sheet that states: “If human remains are discovered, all work must immediately cease, and the local coroner must be contacted. Procedures for the discovery of human remains will be followed in accordance with provisions of the State Health and Safety Code, Sections 7052 and 7050.5 and the State Public Resources Code Sections 5097.9 to 5097.99. If the coroner determines that the remains are those of a Native American, the coroner shall contact the Native American Heritage Commission (NAHC) and subsequent procedures shall be followed, according to State Public Resources Sections 5097.9 to 5097.99, regarding the notification of the Native American Most Likely Descendant. The preceding requirements shall be incorporated into construction contracts and plans to ensure contractor knowledge and responsibility for proper implementation.” Plan Requirements: This note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet and shall be shown on all site development and building plans. Timing: This measure shall be implemented during all site preparation and construction activities. Monitoring: The Department of Development Services and/or Public Works Department shall ensure the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. Should cultural resources be discovered, the landowner shall notify the Planning Division and a professional archaeologist. The Planning Division shall coordinate with the developer and appropriate authorities to avoid damage to cultural resources and determine appropriate action. State law requires the reporting of any human remains. Mitigation Measure #13 (Greenhouse Gas Emissions) Place a note on a separate document which is to be recorded concurrently with the final map or on an additional map sheet that states: “To the extent feasible, the developer shall implement the following measures at the time of development to offset the anticipated contribution of greenhouse gas emissions from residential development:  Support expansion of renewable energy systems o Prewire all new residential development to support photovoltaic system installation.  Support efficiency in vehicles and landscaping equipment o Install electrical vehicle outlets on external walls or in garages in all new residential development.  Improve fuel efficiency of equipment during construction-related activities o Minimize idling time either by shutting equipment off when not in use or reducing the time of idling to no more than 3 minutes. o Use clean or alternative fuel equipment” Plan Requirements: The note shall be placed on a separate document which is to be recorded concurrently with the final map or on an additional map sheet. This note shall also be placed on all building and site development plans. Timing: Shall be implemented prior to issuance of building permits for residential development. Construction-related measures shall be adhered to throughout all grading and construction periods. Monitoring: The Butte County Department of Development Services and the Public Works Department shall ensure that

■ Butte County Department of Development Services ■ ■ Initial Study – TSM17-0001 (Leen) ■ Page 72 of 76 ■

Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001 the note is placed on a separate document which is to be recorded concurrently with the map or on an additional map sheet. The Planning Division will ensure that future residential development includes the applicable measures during Building Permit review. Building inspectors shall spot check and shall ensure compliance on-site.

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

6.0 Environmental Reference Material 1. Baldwin, B.G., D.H. Goldman, D.J. Keil, R. Patterson, T.J. Rosatti, and D.H. Wilkens, editors. 2012. The Jepson Manual: Vascular Plants of California, Second Edition. University of California Press, Berkeley, CA. 2. Barr, C.B. 1991. The distribution, habitat, and status of the valley elderberry longhorn beetle Desmocerus californicus dimorphus. U.S. Fish and Wildlife Service. Sacramento, CA. 3. Bloom, P.H., and D. VanDeWater. 1994. Swainson’s hawk. In: C.G. Thelander and M. Crabtree, editors. Life on the Edge: A Guide to California’s Endangered Natural Resources. Wildlife. BioSystems Books, Santa Cruz, CA. pp. 150-155. 4. Butte County Association of Governments. Butte Regional Conservation Plan, Formal Public Draft Draft. Accessed November 3, 2016. (available at http://www.buttehcp.com/BRCP-Documents/Formal-Public-Draft- BRCP/index.html) 5. Butte County. Butte County Airport Land Use Compatibility Plan. Butte County Airport Land Use Commission. November 15, 2017. 6. Butte County. Butte County Climate Action Plan. February 25, 2014. 7. Butte County. Butte County General Plan 2030 Draft Environmental Impact Report. 8. Butte County. Butte County General Plan 2030 Final Environmental Impact Report. April 8, 2010. Available at http://www.buttegeneralplan.net/products/2010-08-30_FEIR/default.asp. 9. Butte County. Butte County General Plan 2030. October 26, 2010. 10. Butte County. Butte County General Plan 2030 Setting and Trends Report Public Draft. August 2, 2007. Available at http://www.buttegeneralplan.net/products/SettingandTrends/default.asp. 11. Butte County. Butte County Code of Ordinances. Accessed October 2016. Available at https://www.municode.com/library/ca/butte_county/codes/code_of_ordinances/ 12. Butte County. Butte County Department of Development Services GIS Data. October 2016. 13. Butte County Air Quality Management District. CEQA Air Quality Handbook – Guidelines for Assessing Air Quality and Greenhouse Gas Impacts for Projects Subject to CEQA Review. October 23, 2014. 14. California Department of Conservation. Fault-Activity Map of California.Map. Accessed October 2016. Available at maps.conservation.ca.gov/cgs/fam/ 15. California Department of Conservation. California Important Farmland Finder. Accessed October 2016. Available at maps. Conservation.ca.gov/ciff/ciff.html 16. California Department of Fish and Wildlife Biogeographic Data Branch. California Natural Diversity Database RareFind v.5.1.1. Accessed October 2016. Available at https://www.wildlife.ca.gov/Data?CNDDB/Maps-and- Data 17. California Department of Toxic Substance Control. 2009. Envirostor Database. Accessed June 2018. http://www.envirostor.dtsc.ca.gov/public. 18. California Native Plant Society Rare Plant Program. Inventory of Rare and Endangered Plants online edition v8-02. Accessed October 2016. Available at www.rareplants.cnps.org/advanced.html# 19. Collinge, S.K., M. Holyoak, C.B. Barr, and J.T. Marty. 2001. Riparian habitat fragmentation and population persistence of the threatened valley elderberry longhorn beetle in central California. Biological Conservation 100:103-113. 20. Estep, J.A. 1989. Biology, movements, and habitat relationships of the Swainson’s Hawk in the Central Valley of California. 1986-87. California Department of Fish and Game, Nongame Bird and Mammal Sec. Report, pp 52. 21. Federal Emergency Management Agency. FEMA Flood Map Service Center. Accessed October 2016. Map #06007C0505E, effective 1/6/2011. Available at https://msc.fema.gov/portal 22. Fiztner, R.E. 1980. Behavioral ecology of the Swainson’s hawk (Buteo swainsoni) in southeastern Washington. Pacific Northwest Lab. PLN-2754. 23. Holland, R.F. 1986. Preliminary Descriptions of the Terrestrial Natural Communities of California. California

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Project Name: Nels Leen Tentative Subdivision Map, File # TSM17-0001

Department of Fish and Game. Sacramento, CA. 24. Traffic Impact Study for Leen Subdivision. Traffic Works. February 20, 2018 25. Institute of Transportation Engineers. Trip Generation Manual, 9th Edition. 2012. 26. Jennings, M.R. and M.P. Hayes. 1994. Amphibian and reptile species of special concern in California. California Department of Fish and Game. Rancho Cordova, CA. 27. La Val, R.K., and M.L. La Val. 1979. Notes on behavior, and abundance of the red bat Lasiurus borealis. Journal of Mammalogy 60:209-212. 28. Mayer, K.E., and W.F. Laudenslayer. 1988. A Guide to Wildlife Habitats of California. California Department of Forestry and Fire Protection. Sacramento, CA. 29. Shump, K.A., and A.U. Shump. 1982. Laiurus borealis. Mammal Species No. 183 pp 6. 30. Snyder, N.F.R., and J.W. Wiley. 1976 Sexual Size Dimorphism in Hawks and Owls of North America. Ornitholgical Monograph No. 20. 31. Stebbins, R.C. 1985. A field guide to western reptiles and amphibians. Second edition. Houghton Mifflin Co. Boston, Massachusetts. 32. U.S. Census Bureau. Annual Estimates of the Resident Population – 2012 Population Estimates for Butte County, California. March 5, 2013. 33. U.S. Census Bureau. Profile of General Population and Housing Characteristics – 2010. Butte County, California. March 5, 2013. 34. U.S. Department of Agriculture. Natural Resources Conservation Service. 2006. Soil Survey of Butte Area, California, Parts of Butte and Plumas Counties. 35. U.S. Department of Agriculture. Natural Resources Conservation Service. Web Soil Survey. Accessed October 2016. Available at websoilsurvey.sc.egov.usda.gov/App/HomePage.htm 36. U.S. Fish and Wildlife Service. Information for Planning and Conservation Online System. Accessed October 2016. Available at http://ecos.fws.gov/ipac 37. U.S. Fish and Wildlife Service. 1999. Conservation Guidelines for the Valley Elderberry Longhorn Beetle. July 9. Available at http://www.fws.gov/sacramento/es/Survey-Protocols- Guidelines/Documents/velb_conservation.pdf 38. Woodbridge, B.K, K. Finley, and T.S. Seager. 1995. An investigation of the Swainson’s hawk in Argentina. Journal of Raptor Research 29(3):202-204.

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Appendix A Species Observed in the project area by NorthStar Biologists.

Plants Scientific Name Common Name Acer negundo Box elder Aristolochia californica California pipevine Baccharis pilularis Coyote Brush Brassica sp. Mustard species Carex barbarae Santa Barbara sedge Centaurea solstitialis Yellow star thistle Citrullus lanatus Watermelon Croton setiger Turkey mullein Diospyros sp. Persimmon Elymus caput-medusae Medusa head Fraxinus latifolia Oregon ash Gallium aparine Cleavers Hedera helix Common ivy Helianthus sp. Sunflower species Juglans hindsii California black walnut Juglans regia English walnut Morus sp. Mulberry Olea europaea European olive Phytolacca Americana American Pokeberry Platanus racemosa Western sycamore Populus fremontii Fremont cottonwood Prunus cerasifera Cherry plum Prunus dulcis Almond Quercus lobata Valley oak Quercus wislizeni Interior live oak Rubus armeniacus Himalayan blackberry Salix lasiolepis Arroyo willow Sambucus nigra ssp. caerulea Blue elderberry Silybum marianum Milk thistle Sorghum halepense Johnsongrass Toxicodendron diversilobium Poison oak Urtica dioica Stinging nettle Vitis californica California grape

Wildlife Scientific Name Common Name Aphelocoma californica Western scrub-jay Baeolophus inornatus Oak titmouse Bombycilla cedrorum Cedar waxwing Buteo jamaicensis Red-tailed hawk Cardellina pusilla Wilson’s warbler Cathartes aura Turkey vulture Colaptes auratus Northern flicker Callipepla californica California quail Calypte anna Anna’s hummingbird Cathartes aura Turkey vulture Corvus brachyrhynchos American crow Geothlypis trichas Common yellowthroat Haemorhous mexicanus House finch Junco hyemalis Dark-eyed junco Megaceryle alcyon Belted kingfisher Melanerpes formicivorus Acorn woodpecker Melazone crissalis California towhee Melospiza lincolnii Lincoln’s sparrow Mimus polyglottos Northern mockingbird Petrochelidon pyrrhonota Cliff swallow Pica nuttalli Yellow-billed magpie Picoides nuttallii Nuttall’s woodpecker Picoides pubescens Downy woodpecker Pipilo maculates Spotted towhee Piranga ludoviciana Western tanager Psaltriparus minimus Bushtit Pseudacris sierra Sierran treefrog Regulus calendula Ruby-crowned kinglet Sayornis migricans Black phoebe Sceloporus occidentalis Western fence lizard Sciurus griseus Western gray squirrel Setophaga coronata Yellow-rumped warbler Sialia Mexicana Western bluebird Sitta carolinensis White-breasted nuthatch Spinus psaltria Lesser goldfinch Spinus tristis American goldfinch

Sturnus vulgaris European Starling Tachycineta bicolor Tree Swallow Turdus migratorius American Robin Zenaida macroura Mourning dove Zonotrichia atricapilla Golden-crowned sparrow Zonotrichia leucophrys White-crowned sparrow

TRAFFIC IMPACT STUDY for Leen Subdivision

February 20, 2018

PREPARED FOR: Nels Leen & Associates

PREPARED BY:

DRAFT

TRAFFIC WORKS, LLC 2240 St. George Ln, Suite 1, Chico, CA 95926 530.897.0199 www.Traffic-Works.com Traffic Impact Study Leen Subdivision February 20, 2018 YOUR QUESTIONS ANSWERED QUICKLY

Why did you perform this study? This Traffic Impact Study evaluates the potential traffic impacts associated with the proposed Leen Subdivision project. This study of potential transportation impacts was undertaken for community planning and CEQA review purposes and to determine what traffic controls or other mitigations may be needed to reduce potential impacts, if any are identified.

What does the project consist of? The proposed project is a 21 unit single‐family detached housing subdivision. The site is located on the south side of Stanley Avenue east of the Dayton Road / Stanley Avenue intersection in Butte County, CA.

How much traffic will the project generate? The Leen Subdivision project is anticipated to generate 198 Daily trips, 16 AM peak hour trips, and 21 PM peak hour trips.

Are there any traffic impacts? With the addition of project traffic, the Dayton Road/Stanley Avenue intersection is projected to operate at acceptable level of service conditions (LOS “B” or better) under “Existing Plus Project” conditions during both the AM and PM peak hours. Additionally, Stanley Lane and the Stanley Lane/Street A project intersection will operate at acceptable level of service conditions (LOS “A”) under “Existing Plus Project” conditions. No notable traffic operation impacts are anticipated with the project. Are any improvements recommended? Stanley Avenue has a relatively narrow paved width (16 feet at the narrowest but typically 17 to 18 feet) which is less than the 20 foot minimum roadway width recommended in A Policy on Geometric Design of Highways and Streets (2004) published by the American Association of State Highway and Transportation Officials (AASHTO) and narrower than Butte County standards for new County roadways.

To provide a safe and efficient roadway with increased traffic, the applicant will provide a proportionate cost sharing contribution for widening of the pavement section on Stanley Avenue to a 20 foot width from Dayton Road to the project entry point. If the County requests the applicant to physically construct widening improvements in an dollar amount equal to the proportionate share, in lieu of paying the fee, it is our recommendation that the widen begin at Dayton Road and move east to the extent possible with the fee amount. The greatest widening benefit will be realized where traffic volumes are the highest, which is closest to Dayton Road.

Page 1 of 13 Traffic Impact Study Leen Subdivision February 20, 2018

LIST OF FIGURES

1. Study Area

2. Site Plan

3. Existing Traffic Volumes, Lane Configurations, and Controls

4. Project Trips

5. Existing Plus Project Traffic Volumes, Lane Configurations, and Controls

LIST OF APPENDICES

A. Traffic Volume Data

B. Existing Conditions LOS Calculations

C. Existing Plus Project Conditions LOS Calculations

Page 2 of 13 Traffic Impact Study Leen Subdivision February 20, 2018 INTRODUCTION

This report presents the findings of a Traffic Impact Study completed to assess the potential impacts on local roadways and intersections associated with development of the Leen Subdivision project. This Traffic Impact Study has been prepared to describe existing traffic conditions, quantify traffic volumes generated by the proposed project, identify potential impacts on all modes of travel, document findings, and make recommendations to mitigate impacts, if any are found.

Study Area and Evaluated Scenarios

The project is generally located on Stanley Avenue east of the Dayton Road / Stanley Avenue intersection in Butte County, CA. The following intersections and roadway segment were analyzed based on scoping discussions and correspondence with Butte County staff:

 Dayton Road / Stanley Avenue  Stanley Avenue / Street A (project access)  Stanley Avenue roadway segment – Dayton Road to the project site

The locations of these intersections and the study roadway segment are shown on Figure 1 and the project site plan is provided in Figure 2.

This study includes analysis of both the weekday AM and PM peak hours as these are the periods of time in which peak traffic conditions are anticipated to occur. The evaluated development scenarios are:

 Existing Conditions (no project)  Existing Plus Project Conditions

Analysis Methodology

Level of service (LOS) is a term commonly used by transportation practitioners to measure and describe the operational characteristics of intersections, roadway segments, and other facilities. This term equates seconds of delay per vehicle at intersections to letter grades “A” through “F” with “A” representing optimum conditions and “F” representing breakdown or over capacity flows.

The LOS for a Two‐Way STOP Control (TWSC) intersection is defined by the worst movement delay. Signal and All‐Way STOP Control (AWSC) LOS is reported for the overall intersection. The complete methodology is established in the Highway Capacity Manual (HCM), 2010, published by the Transportation Research Board. Table 1 presents the delay thresholds for each level of service grade at un‐signalized and signalized intersections.

Level of service calculations were performed for the study intersections using the Vistro 5.0 software package with analysis and results reported in accordance with the 2010 HCM methodology.

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Table 1: Level of Service Definition for Intersections

Un‐signalized Signalized Level of Brief Description Intersections Intersections Service (average delay/vehicle (average delay/vehicle in seconds) in seconds) A Free flow conditions. < 10 < 10 B Stable conditions with some 10 to 15 10 to 20 affect from other vehicles. C Stable conditions with 15 to 25 20 to 35 significant affect from other vehicles. D High density traffic conditions 25 to 35 35 to 55 still with stable flow. E At or near capacity flows. 35 to 50 55 to 80 F Over capacity conditions. > 50 > 80 Source: Highway Capacity Manual (2010), Chapters 16 and 17

The criteria for evaluating roadway LOS is outlined in the Butte County General Plan 2030. For the roadway segment LOS calculations, roadway capacity is determined by facility type, as shown in Table 2, and roadway volume based on peak hour segment volume. Roadway LOS was determined by comparing the observed and projected peak hour bi‐directional roadway volumes to the volumes shown in Table 2.

Table 2: Level of Service Criteria for Roadway Segments

Peak Hour LOS Capacity Threshold Facility Type A B C D E Minor 2‐lane Hwy 90 200 680 1,410 ≤1,740 Major 2‐lane Hwy/Exp 120 290 790 1,600 ≤2,050 4‐lane, Multi‐lane Hwy/Exp 1,070 1,760 2,530 3,280 ≤3,650 2‐lane Major Arterial ‐‐ ‐‐ 970 1,760 ≤1,870 4‐lane Major Arterial, Undivided ‐‐ ‐‐ 1,750 2,740 ≤2,890 4‐lane Major Arterial, Divided ‐‐ ‐‐ 1,920 3,540 ≤3,740 6‐lane Arterial, Divided ‐‐ ‐‐ 2,710 5,320 ≤5,600 3‐lane Arterial, One‐way Rd ‐‐ ‐‐ 1310 2,060 ≤2,170 2‐lane Freeway 1,110 2,010 2,880 3,570 ≤4,010 2‐lane Freeway + Aux Lane 1,410 2,550 3,640 4,490 ≤5,035 3‐lane Freeway 1,700 3,080 4,400 5,410 ≤6,060 3‐lane Freeway + Aux Lane 2,010 3,640 5,180 6,350 ≤7,100 4‐lane Freeway 2,320 4,200 5,950 7,280 ≤8,140 Major 2‐lane Collector ‐‐ ‐‐ 550 1,180 ≤1,520 * Source: Highway Capacity Manual 2000. Transportation Research Board, Washington, D.C. *Retrieved from Butte County General Plan 2030. Table CIR-2, pg. 181.

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Level of Service Policy

Butte County established county‐wide level of service criteria standards and thresholds in the Butte County General Plan 2030. Circulation Policy CIR‐P6.1 is most applicable to this project location.

Therefore, the trigger requiring traffic mitigation is crossing the threshold between LOS “C” and LOS “D”.

EXISTING TRANSPORTATION FACILITIES

Roadway Facilities

A brief description of the key roadways in the study area is provided below.

Dayton Road within the project area is a two‐lane roadway running generally north‐south with one lane in each direction. It is classified as a “Major Roadway” according to the Butte County General Plan 2030 (Figure CIR‐1). The City of Chico General Plan classifies Dayton Road as a “Major Arterial”. The posted speed limit is 45 miles per hour (mph) within the study area.

Stanley Avenue is an east‐west local roadway. The typical roadway width is 17.5 feet between Dayton Road and the project site with the narrowest measured width at 16 feet. It is classified as a “Local Road” in the Butte County General Plan 2030. The posted speed limit is 25 mph.

Alternative Travel Mode Facilities

No sidewalks or bicycle lanes are present on any of the roadways in the study area. There are approximately three to five foot wide paved shoulders on both sides of Dayton Road in the study area.

Currently there are no fixed route public transit services (B‐Line) available within the project area.

The project location is semi‐rural and therefore very few walking or biking trips are currently made from the existing neighborhood to the City of Chico urbanized area primarily due to the travel distance and secondarily because the connecting facilities have limited pedestrian or bicycle facilities.

Page 5 of 13 Traffic Impact Study Leen Subdivision February 20, 2018

EXISTING CONDITIONS

Existing Traffic Volumes

Existing traffic volumes were determined by collecting new turning movement counts during the AM and PM peak periods at the Dayton Road / Stanley Avenue intersection and 24‐hour roadway traffic volumes on Stanley Avenue on an average mid‐week day in January 2018 with local schools and Chico State University in regular session. Existing intersection lane configurations, controls, and peak hour traffic volumes are shown in Figure 3, attached, and 24‐hour roadway segment volumes are shown graphically in Exhibit 1.

Exhibit 1. Hourly Roadway Volumes on Stanley Avenue

50 PM Peak Hour, 46 45 40 AM Peak Hour, 36 35 30 25 Vehicles

# 20 15 10 5 0

Time

Westbound Volume Eastbound Volume Total Volume

As shown in Exhibit 1, the AM and PM peak hour traffic volumes on Stanley Avenue are 36 and 46 vehicles, respectively. In total, there were 424 vehicles counted on Stanley Avenue during the mid‐week 24 hour period. Complete 24‐hour roadway count data with volume, classification, and speed information is provided in Appendix A.

Page 6 of 13 Traffic Impact Study Leen Subdivision February 20, 2018

Existing Roadway Level of Service

Roadway Level of Service was determined by comparing existing peak hour bi‐directional roadway segment volumes to the thresholds shown in Table 2. The Stanley Avenue roadway segment Level of Service is shown in Table 3.

Table 3: Existing Conditions Roadway Level of Service Summary

Segment Classification Scenario Peak Hour Volume # of Lanes LOS Stanley Ave 2‐Lane Local Road Existing 46 2 A

As shown in Table 4, the Stanley Avenue roadway segment is operating at acceptable LOS “A” conditions during the peak hour. The peak hour volume on Stanley Avenue is extremely low and is approximately 1/10th of the volume needed to reach the LOS “C” threshold in Table 2. The roadway has significant surplus capacity.

Existing Intersection Level of Service Analysis

Intersection Level of service calculations were performed using the existing traffic volumes, lane configurations, and traffic controls. The results are presented in Table 4 and the calculation sheets are provided in Appendix B, attached.

Table 4: Existing Conditions Intersection Level of Service Summary

Existing AM Existing PM Intersection Control Delay1 LOS Delay1 LOS Dayton Road / Stanley Ave Side‐Street Westbound Approach A 9.9 B 11.33 STOP Southbound Left A 7.62 A 8.25 Notes: 1. Delay is reported in seconds per vehicle for the overall intersection for signalized intersections, and for the worst approaches/movements for side‐street stop controlled intersections.

As shown in Table 4, the existing study intersection currently operates at acceptable levels of service (LOS “B” or better).

Intersection Sight Distance

An intersection sight distance evaluation was performed for the side‐street (westbound) approach of the Dayton Road / Stanley Avenue intersection. No significant issues were identified as the sight distances were deemed to be essentially unlimited from the appropriate location 14 feet back from the edge of travel way in accordance with nationally accepted sight distance measurement criteria (A Policy on Geometric Design of Highways and Streets (2004) published by the American Association of State Highway and Transportation Officials (AASHTO)).

Page 7 of 13 Traffic Impact Study Leen Subdivision February 20, 2018

It is important to note that further vegetation growth adjacent to the sight lines looking in both directions (north and south) could impact the current available sight distance in the future. Butte County and adjacent property owners, as appropriate, should remove the vegetation potentially affecting sight lines on a regular basis to insure adequate intersection sight distance is maintained. No design feature or geometric changes are needed at the Dayton Road/Stanley Avenue intersection.

PROPOSED PROJECT

Project Description

The project site is located on two existing contiguous parcels with direct access to the south side of Stanley Avenue approximately 1,500 feet east of Dayton Road. The proposed project consists of 21 residential lots and Lot A which is to be preserved as Open Space pursuant to the Clustered Development Ordinance.

Parking

The project will provide on‐site parking in accordance with Butte County development standards.

Trip Generation

Trip generation rates for the proposed project were obtained from the Trip Generation Manual, 10th Edition, published by the Institute of Transportation Engineers (ITE). Table 5 provides the Daily, AM Peak Hour, and PM Peak Hour trip generation calculations for the proposed project.

Table 5: Trip Generation Estimates

A.M. Peak P.M. Peak Land Use (#) Size Daily Total Entry Exit Total Entry Exit Single‐Family Detached 21 Dwelling 198 16 4 12 21 13 8 Housing (210) Units Notes: ITE 10th Ed. Trip Generation Rates For Single‐Family Detached Housing (Per Dwelling) – Daily: 9.44, AM: 0.74, PM: 0.99

As shown in Table 5, applying the ITE Trip Generation Manual trip rates, the proposed project is anticipated to generate 198 total daily trips, 16 total AM peak hour trips, and 21 total PM peak hour trips.

Vehicle Miles Travelled (VMT) Estimation

With adoption of and implementation of California Senate Bill 743, Vehicle Miles Travelled (VMT) is an important consideration and a key metric of vehicular travel contributions to Green House Gas (GHG) emissions and energy consumption. VMT is typically expressed in miles per day and can simplistically be calculated by multiplying the number of daily project generated trips by the anticipated trip length. The average trip length and percentage of each type of home based trip in Butte County was obtained from the California Emissions Estimator Model (CalEEMod). Table 6 shows each home based trip type and the associated average trip length in Butte County.

Page 8 of 13 Traffic Impact Study Leen Subdivision February 20, 2018

Table 6. Project Vehicle Miles Travelled

Res H‐W Res H‐S Res H‐O Average Total VMT Res H‐W Res H‐S Res H‐O Trip Length Trip Length Trip Length Trip Length per day Trip % Trip % Trip % (miles) (miles) (miles) (miles) (198 Trips) 12.54 7.22 7.22 35 17 48 9.08 1,798

As shown in Table 6, the project is estimated to cause an increase in VMT of 1,798 miles per day. This is likely a very conservative estimate since the project is located closer to the core urban area than the Butte County average travel distances. Butte County currently does not have any specific thresholds or significance criteria related to VMT, but does have general goals of reducing VMT and GHG emissions.

Project Access

One access point is proposed for the project, located on Stanley Avenue, as shown on Figure 2. The access point is proposed as a full access intersection allowing for all possible movements with side‐street stop control (STOP sign on Street A). We understand secondary access is not required per Butte County standards based on the relatively small number of proposed homes and the proposed street design.

Field review of the access location indicated no notable issues for intersection sight distance. Adjacent parcels have large trees and other shrubs along Stanley Avenue but they are not anticipated to impact intersection sight distance at this time. As is common in most locations, vegetation along Stanley Avenue may have to be trimmed and properly maintained over time to maintain appropriate sight lines.

Trip Distribution and Assignment

Traffic generated by the project was distributed to the road network based on the location of the project and for consistency with existing local traffic patterns. The following trip distribution percentages were used for distributing the project traffic:

 75% travelling to/from the north via Dayton Road  25% travelling to/from the south via Dayton Road

100% of the project generated trips were assigned to/from the west on Stanley Avenue from the project site. A time travel comparison was conducted to compare the difference in travel time drivers would experience if they travelled either east or west from the site ultimately to Dayton Road. The travel time east through the neighborhood, using Diamond Avenue and McIntosh Avenue, was found to be twice that of simply using Stanley Avenue to Dayton Road. No notable number of drivers would choose a route that is twice as time consuming to reach the same destination. Review of the roadway network indicates that project traffic would not use Marian Avenue as there would be no benefit in doing so. It is clear that all project traffic should be assumed to choose the most direct route of Stanley Avenue to/from the west to Dayton Road.

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The Existing Plus Project intersection lane configurations and the project trip assignment are shown on Figure 4, attached.

EXISTING PLUS PROJECT CONDITIONS

Existing Plus Project Roadway Level of Service

Roadway Level of Service was calculated by comparing existing plus project peak hour bi‐directional roadway segment volumes to the thresholds shown in Table 2. The Stanley Avenue roadway segment Level of Service is shown in Table 7. Table 7: Existing Plus Project Conditions Roadway Level of Service Summary

Segment Classification Scenario Peak Hour Volume # of Lanes LOS Existing Stanley Ave 2‐Lane Local Road 67 2 A Plus Project

As shown in Table 7, the Stanley Avenue roadway segment is anticipated to operate at acceptable level of service (LOS “A”) conditions during the peak hour. The proposed project only adds 21 peak hour trips on Stanley Avenue and the roadway peak hour volume is still extremely low. The anticipated average daily traffic volume (ADT) under Existing Plus Project conditions is 622 vehicles per day.

Existing Plus Project Intersection Level of Service Analysis

Existing Plus Project traffic volumes were developed by adding the project generated trips (Figure 4) to the existing traffic volumes (Figure 3) and are shown on Figure 5, attached. Existing Plus Project condition Peak Hour Factors (PHF) and lane configurations were assumed to remain the same as existing conditions.

Table 8 presents the level of service analysis summary for the “Existing Plus Project” scenario. Detailed calculation sheets are provided in Appendix C, attached. Table 8: Existing Plus Project Conditions Intersection Level of Service Summary

Existing + Project AM Existing + Project PM Intersection Control Delay1 LOS Delay1 LOS Dayton Road / Stanley Ave Side‐Street Westbound Approach B 10.00 B 11.75 STOP Southbound Left A 7.63 A 8.30 Stanley Ave / Street A Side‐Street Northbound Approach A 8.77 A 8.78 STOP Westbound Left A 7.23 A 7.30 Notes: 1. Delay is reported in seconds per vehicle for the overall intersection for signalized intersections, and for the worst approaches/movements for side‐street stop controlled intersections.

With the addition of project traffic, both study intersections are projected to operate at acceptable level of service (LOS “B” or better) conditions during both the AM and PM peak hours. The proposed project would, on average, increase delay by less than one second per vehicle during the peak hours.

Page 10 of 13 Traffic Impact Study Leen Subdivision February 20, 2018 ROADWAY WIDTH

Stanley Avenue has a relatively narrow paved width (16 feet at the narrowest but typically 17 to 18 feet) which is less than the 20 foot roadway width recommended in A Policy on Geometric Design of Highways and Streets (2004) published by the American Association of State Highway and Transportation Officials (AASHTO). The existing roadway is also narrower than Butte County standards for new construction within the County.

Table 9 shows the recommended minimum width of traveled way, by roadway volume, for rural cross‐ sections as set forth by AASHTO. Table 8. Minimum Width of Traveled Way (AASHTO Exhibit 5‐5)

Minimum width of traveled way (ft) for specified design volume (veh/day) Design Speed under 400 to 1500 to over (mph) 400 1500 2000 2000 15 18 20 20 22 20 18 20 22 24 25 18 20 22 24 30 18 20 22 24 40 18 20 22 24 45 20 22 22 24 50 20 22 22 24 55 22 22 24 24 60 22 22 24 24 Width of graded shoulder on each side of the road (ft) All Speeds 2 5 6 8

As highlighted in Table 9, the minimum width of traveled way (paved width) on Stanley Avenue should be 20 feet. This value is the same with or without the project since the existing daily traffic volume is greater than 400 vehicles per day.

From the parcel lines shown in the Butte County Online GIS program, there should be available right‐of‐ way to widen Stanley Avenue to meet AASHTO recommendations. This improvement may, however, restrict the informal parking that currently occurs on the shoulders along Stanley Avenue. The residential lots fronting Stanley Avenue are generally large with space to park more than two vehicles off‐street, therefore prohibiting parking along the widened roadway should not cause any significant parking impacts.

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With proportionate cost sharing for the widening, or by constructing equal value widening improvements, the project will offset/mitigate its impacts of increased traffic related to the width of Stanley Avenue.

The California Manual on Uniform Traffic Control Devices (CA MUTCD) states that “Center line markings should be placed on all rural arterials and collectors that have a traveled way of 18 feet or more in width and an ADT of 3,000 vehicles per day or greater. Center line markings should also be placed on other traveled ways where an engineering study indicates such a need.” The ADT on Stanley Avenue is well under 3,000 vehicles per day (622 ADT with the project) and we did not identify any special circumstances (horizontal or vertical curves, unusual conditions, etc.), therefore centerline striping is not justified at this time.

CONCLUSIONS & RECOMMENDATIONS

The following is a list of our key findings and recommendations:

Proposed Project: The project is a 21 unit single‐family detached housing subdivision. The project site is generally located on the south side of Stanley Avenue about 1,500 feet east of the Dayton Road / Stanley Avenue intersection in Butte County, CA.

Project Trips: The Leen Subdivision project is anticipated to generate 198 Daily trips, 16 AM peak hour trips, and 21 PM peak hour trips.

Project Access: One access point is proposed for the project, located on Stanley Avenue, as shown on Figure 2. The access point is proposed as a full access intersection allowing for all possible movements with side‐street stop control.

Existing Level of Service: All study intersections and roadway segments currently operate at acceptable level of service conditions (LOS “B” or better) during the AM and PM peak hours.

Existing Plus Project Level of Service: With the addition of project traffic, all study intersections and roadway segments are projected to continue operating at acceptable LOS conditions (LOS “B” or better) under the “Existing Plus Project” conditions during both the AM and PM peak hours. The project would have no notable operational impacts on local intersections or roadway segments.

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Summary of Proposed Improvements: To provide a safe and efficient roadway cross‐section on Stanley Avenue with increased traffic, the applicant will provide a proportionate cost sharing contribution for widening of the pavement section to a 20 foot width from Dayton Road to the project entry point. If the County requests the applicant to physically construct widening improvements in an dollar amount equal to the proportionate share, in lieu of paying the fee, it is our recommendation that the widen begin at Dayton Road and move east to the extent possible with the fee amount. The greatest widening benefit will be realized where traffic volumes are the highest, which is closest to Dayton Road.

Page 13 of 13 Study Locations 1 Dayton Rd / Stanley Ave 2 Stanley Ave / Street A

Dayton Rd

Traﬃc Volume Count Location Stanley Ave 1 2 Street A Street

Project Site

Figure 1 Leen Subdivision Traffic Impact Study NO SCALE Study Area 0 80 160 Feet

PARCEL 21 PARCEL 1 8,512.4 SF 8,913.2 SF 0.2 AC 0.2 AC (0.25 AC NET) (0.27 AC NET)

PARCEL 20 9,203.4 SF PARCEL 2 0.21 AC 8,939.1 SF (0.25 AC NET) 0.21 AC (0.25 AC NET)

PARCEL 3 8,965.0 SF 0.21 AC (0.25 AC NET) PARCEL 19 26,763.6 SF 0.61 AC PARCEL 4 (0.74 AC NET) 8,990.9 SF 0.21 AC (0.25 AC NET)

PARCEL 5 PARCEL 18 9,016.8 SF 9,549.3 SF 0.21 AC 0.22 AC (0.25 AC NET) (0.26 AC NET)

PARCEL 6 9,165.1 SF PARCEL 17 0.21 AC 9,528.4 SF (0.26 AC NET) 0.22 AC (0.26 AC NET)

PARCEL 16 PARCEL 7 9,507.4 SF 9,191.7 SF 0.22 AC 0.21 AC (0.26 AC NET) (0.26 AC NET)

PARCEL 15 PARCEL 8 9,486.4 SF 9,218.4 SF 0.22 AC 0.21 AC (0.26 AC NET) (0.26 AC NET)

PARCEL 14 9,465.4 SF PARCEL 9 0.22 AC 9,244.9 SF (0.26 AC NET) 0.21 AC (0.26 AC NET)

PARCEL 10 PARCEL 13 8,977.5 SF 9,431.4 SF 0.21 AC 0.22 AC (0.27 AC NET) (0.27 AC NET) PARCEL 11 32,717.1 SF PARCEL 12 0.75 AC WASTEWATER 8,253.3 SF (0.77 AC NET) DISPOSAL AREA 0.19 AC (0.23 AC NET)

WASTEWATER DISPOSAL AREA

LOT A 523,764.4 SF 12.02 AC (12.09 AC NET)

Figure 2 Leen Subdivision Traffic Impact Study Site Plan Dayton Rd

Stanley Ave 1

Project Site

Dayton Rd / Stanley Ave

1 174 (167) 5 (14)

25 (10) 8 (2) 177 (353) 0 (7)

AM Peak Hour Volume (PM Peak Hour Volume) Figure 3 Leen Subdivision Traffic Impact Study NO SCALE Existing Traffic Volumes, Lane Configurations, and Controls Dayton Rd

Stanley Ave 1 2 Street A Street

Project Site

Dayton Rd / Stanley Ave Stanley Ave / Street A

1 2 3 (10)

9 (6) 3 (2) (13) 4 12 (8) 1 (3)

AM Peak Hour Volume (PM Peak Hour Volume) Figure 4 Leen Subdivision Traffic Impact Study NO SCALE Project Trips Dayton Rd

Stanley Ave 1 2 Street A Street

Project Site

Dayton Rd / Stanley Ave Stanley Ave / Street A

1 2 174 (167) 8 (24)

34 (16) (21) 5 33 (12) 11 (4) (13) 4 0 (0) 177 (353) 1 (10) 12 (8) 0 (0)

AM Peak Hour Volume (PM Peak Hour Volume) Figure 5 Leen Subdivision Traffic Impact Study NO SCALE Existing Plus Project Traffic Volumes, Lane Configurations, and Controls

Appendix A Traffic Volume Data

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Daily Vehicle Volume Report

Study Date: Tuesday, 01/30/2018 / Wednesday, 01/31/2018 Unit ID: TW #5 Location: Stanley Ave Comments:

Westbound Eastbound Total Volume Volume Volume 16:00 - 16:59 24 22 46 17:00 - 17:59 15 19 34 18:00 - 18:59 11 18 29 19:00 - 19:59 9 22 31 20:00 - 20:59 6 12 18 21:00 - 21:59 1 7 8 22:00 - 22:59 1 2 3 23:00 - 23:59 1 4 5 00:00 - 00:59 1 0 1 01:00 - 01:59 3 0 3 02:00 - 02:59 0 0 0 03:00 - 03:59 0 1 1 04:00 - 04:59 1 0 1 05:00 - 05:59 2 2 4 06:00 - 06:59 4 1 5 07:00 - 07:59 6 5 11 08:00 - 08:59 27 9 36 09:00 - 09:59 20 8 28 10:00 - 10:59 13 7 20 11:00 - 11:59 11 9 20 12:00 - 12:59 15 15 30 13:00 - 13:59 16 14 30 14:00 - 14:59 15 10 25 15:00 - 15:59 18 17 35 Totals 220 204 424 AM Peak Time 08:02 - 09:01 10:36 - 11:35 08:02 - 09:01 AM Peak Volume 30 11 39 PM Peak Time 16:03 - 17:02 18:29 - 19:28 16:00 - 16:59 PM Peak Volume 25 29 46

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Daily Total Classes Report

Study Date: Tuesday, 01/30/2018 / Wednesday, 01/31/2018 Unit ID: TW #5 Location: Stanley Ave Comments:

#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 Total 16:00 - 16:59 0 23 15 0 8 0 0 0 0 0 0 0 0 46 17:00 - 17:59 0 26 6 0 2 0 0 0 0 0 0 0 0 34 18:00 - 18:59 0 21 5 0 3 0 0 0 0 0 0 0 0 29 19:00 - 19:59 0 23 5 0 3 0 0 0 0 0 0 0 0 31 20:00 - 20:59 0 14 4 0 0 0 0 0 0 0 0 0 0 18 21:00 - 21:59 0 8 0 0 0 0 0 0 0 0 0 0 0 8 22:00 - 22:59 0 1 1 0 1 0 0 0 0 0 0 0 0 3 23:00 - 23:59 0 2 1 0 2 0 0 0 0 0 0 0 0 5 00:00 - 00:59 0 1 0 0 0 0 0 0 0 0 0 0 0 1 01:00 - 01:59 0 3 0 0 0 0 0 0 0 0 0 0 0 3 02:00 - 02:59 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03:00 - 03:59 0 1 0 0 0 0 0 0 0 0 0 0 0 1 04:00 - 04:59 0 1 0 0 0 0 0 0 0 0 0 0 0 1 05:00 - 05:59 0 4 0 0 0 0 0 0 0 0 0 0 0 4 06:00 - 06:59 0 3 2 0 0 0 0 0 0 0 0 0 0 5 07:00 - 07:59 0 9 2 0 0 0 0 0 0 0 0 0 0 11 08:00 - 08:59 0 25 5 0 6 0 0 0 0 0 0 0 0 36 09:00 - 09:59 0 17 7 0 4 0 0 0 0 0 0 0 0 28 10:00 - 10:59 0 12 2 0 6 0 0 0 0 0 0 0 0 20 11:00 - 11:59 0 11 5 0 4 0 0 0 0 0 0 0 0 20 12:00 - 12:59 0 24 3 0 3 0 0 0 0 0 0 0 0 30 13:00 - 13:59 0 18 5 0 7 0 0 0 0 0 0 0 0 30 14:00 - 14:59 0 11 6 0 6 2 0 0 0 0 0 0 0 25 15:00 - 15:59 0 21 9 0 5 0 0 0 0 0 0 0 0 35 Totals 0 279 83 0 60 2 0 0 0 0 0 0 0 424 Percent of Total 0.0 65.8 19.6 0.0 14.2 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 100 Percent of AM 0.0 66.9 17.7 0.0 15.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 100 Percent of PM 0.0 65.3 20.4 0.0 13.6 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 100 Truck Summary: Total Trucks:62 % Trucks: 14.6 AM % Trucks: 15.4 PM % Trucks: 14.3

Classification Scheme: FHWA (ID: 1)

#1 Motorcycles - 2 Axles #6 Single Unit Truck - 3 Axles #11 Multi-Unit - 5 Axles or Less #2 Passenger Cars - 2 Axles #7 Single Unit - 4 Axles #12 Multi-Unit - 6 Axles #3 Pickup Trucks, Vans - 2 Axles #8 Single Unit - 4 Axles or Less #13 Multi-Unit - 7 Axles or More #4 Buses #9 Double Unit - 5 Axles #5 Single Unit - 2 Axles, 6 Tires #10 Double Unit - 6 Axles or More

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Daily Total Speeds (MPH)

Study Date: Tuesday, 01/30/2018 / Wednesday, 01/31/2018 Unit ID: TW #5 Location: Stanley Ave Posted Speed: 25 Comments:

5- 15- 20- 25- 30- 35- 40- 45- 50- 55- 60- 65- 70- 75- 80- 14 19 24 29 34 39 44 49 54 59 64 69 74 79 99 Total 16:00 - 16:59 6 5 12 11 8 3 1 0 0 0 0 0 0 0 0 46 17:00 - 17:59 4 8 9 7 3 3 0 0 0 0 0 0 0 0 0 34 18:00 - 18:59 6 1 7 12 3 0 0 0 0 0 0 0 0 0 0 29 19:00 - 19:59 3 8 7 10 2 1 0 0 0 0 0 0 0 0 0 31 20:00 - 20:59 1 2 5 6 4 0 0 0 0 0 0 0 0 0 0 18 21:00 - 21:59 0 0 5 3 0 0 0 0 0 0 0 0 0 0 0 8 22:00 - 22:59 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 3 23:00 - 23:59 0 0 2 1 0 0 1 1 0 0 0 0 0 0 0 5 00:00 - 00:59 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 01:00 - 01:59 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 3 02:00 - 02:59 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03:00 - 03:59 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 04:00 - 04:59 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 05:00 - 05:59 0 2 1 1 0 0 0 0 0 0 0 0 0 0 0 4 06:00 - 06:59 0 1 2 1 1 0 0 0 0 0 0 0 0 0 0 5 07:00 - 07:59 0 4 3 2 1 1 0 0 0 0 0 0 0 0 0 11 08:00 - 08:59 0 4 9 17 4 2 0 0 0 0 0 0 0 0 0 36 09:00 - 09:59 4 0 6 10 7 1 0 0 0 0 0 0 0 0 0 28 10:00 - 10:59 2 1 3 8 5 0 0 1 0 0 0 0 0 0 0 20 11:00 - 11:59 3 3 4 8 2 0 0 0 0 0 0 0 0 0 0 20 12:00 - 12:59 3 4 15 6 1 1 0 0 0 0 0 0 0 0 0 30 13:00 - 13:59 2 1 11 11 3 2 0 0 0 0 0 0 0 0 0 30 14:00 - 14:59 2 0 13 5 4 1 0 0 0 0 0 0 0 0 0 25 15:00 - 15:59 2 3 6 15 6 3 0 0 0 0 0 0 0 0 0 35 Totals 38 48 122 138 55 19 2 2 0 0 0 0 0 0 0 424 Percent of Total 9.0 11.3 28.8 32.5 13.0 4.5 0.5 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 100 Percent of AM 6.9 12.3 22.3 38.5 15.4 3.8 0.0 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 100 Percent of PM 9.9 10.9 31.6 29.9 11.9 4.8 0.7 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 100 Standard Deviation: 7.1 MPH Ten Mile Pace: 20 to 29 MPH 85th Percentile: 31.3 MPH Mean Speed: 24.6 MPH Percent in Ten Mile Pace: 61.3% Median Speed: 25.1 MPH 15th Percentile: 17.6 MPH Modal Speed: 27.5 MPH 90th Percentile: 33.2 MPH 95th Percentile: 35.3 MPH

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Appendix B Existing Conditions LOS Calculations

Generated with Leen Subdivision TIA Version 5.00-00 Existing AM LOS Intersection Level Of Service Report Intersection 1: Dayton Rd / Stanley Ave Control Type: Two-way stop Delay (sec / veh): 11.2 Analysis Method: HCM 6th Edition Level Of Service: B Analysis Period: 15 minutes Volume to Capacity (v/c): 0.015

Intersection Setup

Name Dayton Rd Dayton Rd Stanley Ave Approach Northbound Southbound Westbound

Lane Configuration

Turning Movement Thru Right Left Thru Left Right Lane Width [ft] 12.00 12.00 12.00 12.00 8.00 8.00 No. of Lanes in Pocket 0 0 0 0 0 0 Pocket Length [ft] 100.00 100.00 100.00 100.00 100.00 100.00 Speed [mph] 35.00 35.00 25.00 Grade [%] 0.00 0.00 0.00 Crosswalk No No No

Volumes

Name Dayton Rd Dayton Rd Stanley Ave Base Volume Input [veh/h] 177 0 5 174 8 25 Base Volume Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Heavy Vehicles Percentage [%] 2.00 2.00 2.00 2.00 2.00 2.00 Growth Rate 1.00 1.00 1.00 1.00 1.00 1.00 In-Process Volume [veh/h] 0 0 0 0 0 0 Site-Generated Trips [veh/h] 0 0 0 0 0 0 Diverted Trips [veh/h] 0 0 0 0 0 0 Pass-by Trips [veh/h] 0 0 0 0 0 0 Existing Site Adjustment Volume [veh/h] 0 0 0 0 0 0 Other Volume [veh/h] 0 0 0 0 0 0 Total Hourly Volume [veh/h] 177 0 5 174 8 25 Peak Hour Factor 0.9110 0.9110 0.9110 0.9110 0.9110 0.9110 Other Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Total 15-Minute Volume [veh/h] 49 0 1 48 2 7 Total Analysis Volume [veh/h] 194 0 5 191 9 27 Pedestrian Volume [ped/h] 0 0 0 Generated with Leen Subdivision TIA Version 5.00-00 Existing AM LOS

Intersection Settings

Priority Scheme Free Free Stop Flared Lane No Storage Area [veh] 0 0 0 Two-Stage Gap Acceptance No Number of Storage Spaces in Median 0 0 0

Movement, Approach, & Intersection Results

V/C, Movement V/C Ratio 0.00 0.00 0.00 0.00 0.01 0.03 d_M, Delay for Movement [s/veh] 0.00 0.00 7.62 0.00 11.16 9.48 Movement LOS A A A A B A 95th-Percentile Queue Length [veh] 0.00 0.00 0.50 0.50 0.15 0.15 95th-Percentile Queue Length [ft] 0.00 0.00 12.38 12.38 3.67 3.67 d_A, Approach Delay [s/veh] 0.00 0.19 9.90 Approach LOS A A A d_I, Intersection Delay [s/veh] 0.93 Intersection LOS B Generated with Leen Subdivision TIA Version 5.00-00 Existing PM Intersection Level Of Service Report Intersection 1: Dayton Rd / Stanley Ave Control Type: Two-way stop Delay (sec / veh): 13.8 Analysis Method: HCM 6th Edition Level Of Service: B Analysis Period: 15 minutes Volume to Capacity (v/c): 0.005

Intersection Setup

Name Dayton Rd Dayton Rd Stanley Ave Approach Northbound Southbound Westbound

Lane Configuration

Volumes

Name Dayton Rd Dayton Rd Stanley Ave Base Volume Input [veh/h] 353 7 14 167 2 10 Base Volume Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Heavy Vehicles Percentage [%] 2.00 2.00 2.00 2.00 2.00 2.00 Growth Rate 1.00 1.00 1.00 1.00 1.00 1.00 In-Process Volume [veh/h] 0 0 0 0 0 0 Site-Generated Trips [veh/h] 0 0 0 0 0 0 Diverted Trips [veh/h] 0 0 0 0 0 0 Pass-by Trips [veh/h] 0 0 0 0 0 0 Existing Site Adjustment Volume [veh/h] 0 0 0 0 0 0 Other Volume [veh/h] 0 0 0 0 0 0 Total Hourly Volume [veh/h] 353 7 14 167 2 10 Peak Hour Factor 0.8270 0.8270 0.8270 0.8270 0.8270 0.8270 Other Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Total 15-Minute Volume [veh/h] 107 2 4 50 1 3 Total Analysis Volume [veh/h] 427 8 17 202 2 12 Pedestrian Volume [ped/h] 0 0 0 Generated with Leen Subdivision TIA Version 5.00-00 Existing PM

Intersection Settings

Priority Scheme Free Free Stop Flared Lane No Storage Area [veh] 0 0 0 Two-Stage Gap Acceptance No Number of Storage Spaces in Median 0 0 0

Movement, Approach, & Intersection Results

V/C, Movement V/C Ratio 0.00 0.00 0.02 0.00 0.00 0.02 d_M, Delay for Movement [s/veh] 0.00 0.00 8.25 0.00 13.79 10.92 Movement LOS A A A A B B 95th-Percentile Queue Length [veh] 0.00 0.00 0.72 0.72 0.07 0.07 95th-Percentile Queue Length [ft] 0.00 0.00 18.02 18.02 1.84 1.84 d_A, Approach Delay [s/veh] 0.00 0.64 11.33 Approach LOS A A B d_I, Intersection Delay [s/veh] 0.45 Intersection LOS B

Appendix C Existing Plus Project Conditions

LOS Calculations

Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project AM LOS Intersection Level Of Service Report Intersection 1: Dayton Rd / Stanley Ave Control Type: Two-way stop Delay (sec / veh): 11.3 Analysis Method: HCM 6th Edition Level Of Service: B Analysis Period: 15 minutes Volume to Capacity (v/c): 0.020

Intersection Setup

Name Dayton Rd Dayton Rd Stanley Ave Approach Northbound Southbound Westbound

Lane Configuration

Volumes

Name Dayton Rd Dayton Rd Stanley Ave Base Volume Input [veh/h] 177 0 5 174 8 25 Base Volume Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Heavy Vehicles Percentage [%] 2.00 2.00 2.00 2.00 2.00 2.00 Growth Rate 1.00 1.00 1.00 1.00 1.00 1.00 In-Process Volume [veh/h] 0 0 0 0 0 0 Site-Generated Trips [veh/h] 0 1 3 0 3 9 Diverted Trips [veh/h] 0 0 0 0 0 0 Pass-by Trips [veh/h] 0 0 0 0 0 0 Existing Site Adjustment Volume [veh/h] 0 0 0 0 0 0 Other Volume [veh/h] 0 0 0 0 0 0 Total Hourly Volume [veh/h] 177 1 8 174 11 34 Peak Hour Factor 0.9110 0.9110 0.9110 0.9110 0.9110 0.9110 Other Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Total 15-Minute Volume [veh/h] 49 0 2 48 3 9 Total Analysis Volume [veh/h] 194 1 9 191 12 37 Pedestrian Volume [ped/h] 0 0 0 Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project AM LOS

Intersection Settings

Priority Scheme Free Free Stop Flared Lane No Storage Area [veh] 0 0 0 Two-Stage Gap Acceptance No Number of Storage Spaces in Median 0 0 0

Movement, Approach, & Intersection Results

V/C, Movement V/C Ratio 0.00 0.00 0.01 0.00 0.02 0.04 d_M, Delay for Movement [s/veh] 0.00 0.00 7.63 0.00 11.33 9.57 Movement LOS A A A A B A 95th-Percentile Queue Length [veh] 0.00 0.00 0.51 0.51 0.20 0.20 95th-Percentile Queue Length [ft] 0.00 0.00 12.69 12.69 5.09 5.09 d_A, Approach Delay [s/veh] 0.00 0.34 10.00 Approach LOS A A B d_I, Intersection Delay [s/veh] 1.26 Intersection LOS B Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project AM LOS Intersection Level Of Service Report Intersection 2: Stanley Ave / Street A Control Type: Two-way stop Delay (sec / veh): 8.8 Analysis Method: HCM 6th Edition Level Of Service: A Analysis Period: 15 minutes Volume to Capacity (v/c): 0.013

Intersection Setup

Name Street A Stanley Ave Stanley Ave Approach Northbound Eastbound Westbound

Lane Configuration

Turning Movement Left Right Thru Right Left Thru Lane Width [ft] 18.00 18.00 8.00 8.00 8.00 8.00 No. of Lanes in Pocket 0 0 0 0 0 0 Pocket Length [ft] 100.00 100.00 100.00 100.00 100.00 100.00 Speed [mph] 25.00 25.00 25.00 Grade [%] 0.00 0.00 0.00 Crosswalk No No No

Volumes

Name Street A Stanley Ave Stanley Ave Base Volume Input [veh/h] 0 0 5 0 0 33 Base Volume Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Heavy Vehicles Percentage [%] 2.00 2.00 2.00 2.00 2.00 2.00 Growth Rate 1.00 1.00 1.00 1.00 1.00 1.00 In-Process Volume [veh/h] 0 0 0 0 0 0 Site-Generated Trips [veh/h] 12 0 0 4 0 0 Diverted Trips [veh/h] 0 0 0 0 0 0 Pass-by Trips [veh/h] 0 0 0 0 0 0 Existing Site Adjustment Volume [veh/h] 0 0 0 0 0 0 Other Volume [veh/h] 0 0 0 0 0 0 Total Hourly Volume [veh/h] 12 0 5 4 0 33 Peak Hour Factor 0.9110 0.9110 0.9110 0.9110 0.9110 0.9110 Other Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Total 15-Minute Volume [veh/h] 3 0 1 1 0 9 Total Analysis Volume [veh/h] 13 0 5 4 0 36 Pedestrian Volume [ped/h] 0 0 0 Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project AM LOS

Intersection Settings

Priority Scheme Stop Free Free Flared Lane No Storage Area [veh] 0 0 0 Two-Stage Gap Acceptance No Number of Storage Spaces in Median 0 0 0

Movement, Approach, & Intersection Results

V/C, Movement V/C Ratio 0.01 0.00 0.00 0.00 0.00 0.00 d_M, Delay for Movement [s/veh] 8.77 8.40 0.00 0.00 7.23 0.00 Movement LOS A A A A A A 95th-Percentile Queue Length [veh] 0.04 0.04 0.00 0.00 0.00 0.00 95th-Percentile Queue Length [ft] 1.02 1.02 0.00 0.00 0.00 0.00 d_A, Approach Delay [s/veh] 8.77 0.00 0.00 Approach LOS A A A d_I, Intersection Delay [s/veh] 1.97 Intersection LOS A Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project PM LOS Intersection Level Of Service Report Intersection 1: Dayton Rd / Stanley Ave Control Type: Two-way stop Delay (sec / veh): 14.3 Analysis Method: HCM 6th Edition Level Of Service: B Analysis Period: 15 minutes Volume to Capacity (v/c): 0.013

Intersection Setup

Name Dayton Rd Dayton Rd Stanley Ave Approach Northbound Southbound Westbound

Lane Configuration

Volumes

Name Dayton Rd Dayton Rd Stanley Ave Base Volume Input [veh/h] 353 7 14 167 2 10 Base Volume Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Heavy Vehicles Percentage [%] 2.00 2.00 2.00 2.00 2.00 2.00 Growth Rate 1.00 1.00 1.00 1.00 1.00 1.00 In-Process Volume [veh/h] 0 0 0 0 0 0 Site-Generated Trips [veh/h] 0 3 10 0 2 6 Diverted Trips [veh/h] 0 0 0 0 0 0 Pass-by Trips [veh/h] 0 0 0 0 0 0 Existing Site Adjustment Volume [veh/h] 0 0 0 0 0 0 Other Volume [veh/h] 0 0 0 0 0 0 Total Hourly Volume [veh/h] 353 10 24 167 4 16 Peak Hour Factor 0.8270 0.8270 0.8270 0.8270 0.8270 0.8270 Other Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Total 15-Minute Volume [veh/h] 107 3 7 50 1 5 Total Analysis Volume [veh/h] 427 12 29 202 5 19 Pedestrian Volume [ped/h] 0 0 0 Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project PM LOS

Intersection Settings

Priority Scheme Free Free Stop Flared Lane No Storage Area [veh] 0 0 0 Two-Stage Gap Acceptance No Number of Storage Spaces in Median 0 0 0

Movement, Approach, & Intersection Results

V/C, Movement V/C Ratio 0.00 0.00 0.03 0.00 0.01 0.03 d_M, Delay for Movement [s/veh] 0.00 0.00 8.30 0.00 14.35 11.07 Movement LOS A A A A B B 95th-Percentile Queue Length [veh] 0.00 0.00 0.77 0.77 0.13 0.13 95th-Percentile Queue Length [ft] 0.00 0.00 19.33 19.33 3.37 3.37 d_A, Approach Delay [s/veh] 0.00 1.04 11.75 Approach LOS A A B d_I, Intersection Delay [s/veh] 0.75 Intersection LOS B Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project PM LOS Intersection Level Of Service Report Intersection 2: Stanley Ave / Street A Control Type: Two-way stop Delay (sec / veh): 8.8 Analysis Method: HCM 6th Edition Level Of Service: A Analysis Period: 15 minutes Volume to Capacity (v/c): 0.010

Intersection Setup

Name Street A Stanley Ave Stanley Ave Approach Northbound Eastbound Westbound

Lane Configuration

Volumes

Name Street A Stanley Ave Stanley Ave Base Volume Input [veh/h] 0 0 21 0 0 12 Base Volume Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Heavy Vehicles Percentage [%] 2.00 2.00 2.00 2.00 2.00 2.00 Growth Rate 1.00 1.00 1.00 1.00 1.00 1.00 In-Process Volume [veh/h] 0 0 0 0 0 0 Site-Generated Trips [veh/h] 8 0 0 13 0 0 Diverted Trips [veh/h] 0 0 0 0 0 0 Pass-by Trips [veh/h] 0 0 0 0 0 0 Existing Site Adjustment Volume [veh/h] 0 0 0 0 0 0 Other Volume [veh/h] 0 0 0 0 0 0 Total Hourly Volume [veh/h] 8 0 21 13 0 12 Peak Hour Factor 0.8270 0.8270 0.8270 0.8270 0.8270 0.8270 Other Adjustment Factor 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Total 15-Minute Volume [veh/h] 2 0 6 4 0 4 Total Analysis Volume [veh/h] 10 0 25 16 0 15 Pedestrian Volume [ped/h] 0 0 0 Generated with Leen Subdivision TIA Version 5.00-00 Existing Plus Project PM LOS

Intersection Settings

Priority Scheme Stop Free Free Flared Lane No Storage Area [veh] 0 0 0 Two-Stage Gap Acceptance No Number of Storage Spaces in Median 0 0 0

Movement, Approach, & Intersection Results

V/C, Movement V/C Ratio 0.01 0.00 0.00 0.00 0.00 0.00 d_M, Delay for Movement [s/veh] 8.78 8.50 0.00 0.00 7.30 0.00 Movement LOS A A A A A A 95th-Percentile Queue Length [veh] 0.03 0.03 0.00 0.00 0.00 0.00 95th-Percentile Queue Length [ft] 0.79 0.79 0.00 0.00 0.00 0.00 d_A, Approach Delay [s/veh] 8.78 0.00 0.00 Approach LOS A A A d_I, Intersection Delay [s/veh] 1.33 Intersection LOS A