5.7 Hydrology and Water Quality

BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis

5.7 HYDROLOGY AND WATER QUALITY This section of the Draft Environmental Impact Report (DEIR) evaluates the potential impacts to hydrology and water quality conditions from implementation of the Beach Boulevard Specific Plan (Proposed Project). Hydrology deals with the distribution and circulation of water, both on land and underground. Water quality deals with the quality of surface and groundwater. Surface water is on the surface of the land and includes lakes, rivers, streams, and creeks. Groundwater is below the surface of the earth.

The analysis in this section is based partly upon the Infrastructure Technical Report for Hydrology, Sewer, Water, & Water Quality for the Proposed Project completed by Fuscoe Engineering in September 2017. A complete copy of this report is included as Appendix G to this DEIR. Some additional information on groundwater was obtained from the Orange County Water District (OCWD) Groundwater Management Plan 2015 Update.

5.7.1 Environmental Setting 5.7.1.1 REGULATORY FRAMEWORK Clean Water Act Under the Clean Water Act (CWA) of 1977, the United States Environmental Protection Agency (EPA) seeks to restore and maintain the chemical, physical, and biological integrity of the nation’s waters. The statute employs a variety of regulatory and non-regulatory tools to reduce direct pollutant discharges into waterways, finance municipal wastewater treatment facilities, and manage polluted runoff. The CWA authorizes the EPA to implement water quality regulations. The National Pollutant Discharge Elimination System (NPDES) permit program under Section 402(p) of the CWA controls water pollution by regulating storm water discharges into the waters of the United States. California has an approved state NPDES program. The EPA has delegated authority for water permitting to the State Water Resources Control Board (SWRCB), which has nine regional boards. The Santa Ana Regional Water Quality Control Board (RWQCB - Region 8) regulates water quality in the Project Area.

Sections 401 and 404 of the CWA are administered through the Regulatory Program of the U.S. Army Corps of Engineers (ACOE) and regulate the water quality of all discharges of fill or dredged material into waters of the United States, including wetlands and intermittent stream channels. Section 401, Title 33, Section 1341 of the CWA sets water-quality certification requirements for “any applicant applying for a federal license or permit to conduct any activity including, but not limited to, the construction or operation of facilities, which may result in any discharge into the navigable waters.” If there are ephemeral drainages and wetlands identified in the Project Area, construction and other activities may require the acquisition of a permit from the ACOE under Section 404 of the CWA and water quality certification from the Santa Ana RWQCB under Section 401 of the CWA. Section 401 certification is required from the Santa Ana RWQCB prior to final issuance of Section 404 permits by the ACOE.

August 2018 Page 5.7-1 BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

Section 303(d) of the CWA requires that each state identify water bodies or segments of water bodies that are “impaired” (i.e., not meeting one or more of the water quality standards established by the state). These waters are identified in the Section 303(d) list as waters that are polluted and need further attention to support their beneficial uses. Once the water body or segment is listed, the state is required to establish a total maximum daily load (TMDL) for the pollutant causing the conditions of impairment. TMDL is the maximum amount of a pollutant that a water body can receive and still meet water quality standards. Typically, TMDL is the sum of the allowable loads of a single pollutant from all contributing point and non- point sources. The intent of the 303(d) list is to identify water bodies that require future development of a TMDL to maintain water quality. In accordance with Section 303(d), the RWQCB has identified impaired water bodies in its jurisdiction, and the pollutant or stressor responsible for impairing the water quality. The receiving waters for the Project Area are Carbon Creek, which passes through the Project Area; and Moody Creek, which originates about two miles west of the Project Area. Carbon Creek and Moody Creek both flow into Coyote Creek, which is tributary to the San Gabriel River Estuary. Those water bodies are listed on the Clean Water Act Section 303(d) List of Water Quality Limited Segments for the following pollutants:

. Carbon Creek  chloride

 sulfates

. Moody Creek: none

. Coyote Creek  ammonia

 diazinon

 bacteria

 pH

 toxicity

 copper

 lead

. San Gabriel River Estuary  dioxin

 nickel

 dissolved oxygen

 copper

Porter-Cologne Water Quality Act The Porter-Cologne Water Quality Act (Water Code sections 13000 et seq.) is the basic water quality control law for California. Under this Act, the SWRCB has ultimate control over state water rights and water quality policy. In California, the EPA has delegated authority to issue NPDES permits to the SWRCB. The state is

Page 5.7-2 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

divided into nine regions related to water quality and quantity characteristics. The SWRCB, through its nine RWQCBs, carries out the regulation, protection, and administration of water quality in each region. Each regional board is required to adopt a Water Quality Control Plan or Basin Plan that designates beneficial uses and water quality objectives for the region’s surface water and groundwater basins. The Santa Ana RWQCB’s Basin Plan covers the Project Area, which is primarily within the Santa Ana River Watershed. The Santa Ana Region Basin Plan was adopted in 1995 and subsequently revised in 2008 and 2011. This Basin Plan gives direction on the beneficial uses of the state waters in Region 8, describes the water quality that must be maintained to support such uses, and provides programs, projects, and other actions necessary to achieve the standards established in the Basin Plan. The Basin Plan also provides all relevant information necessary to carry out the state’s antidegradation policy for surface waters and groundwater, 303(d) listing of impaired waters, and related TMDLs.

5.7.1.2 APPLICABLE PLANS AND PROGRAMS National Pollutant Discharge Elimination System The NPDES permit program was established by the CWA to regulate municipal and industrial discharges to surface waters of the US from their municipal separate storm sewer systems (MS4s). Under the NPDES program, all facilities which discharge pollutants into waters of the US are required to obtain an NPDES permit. Requirements for storm water discharges are also regulated under this program.

Municipal Stormwater (MS4) Permit The Project Area lies within the jurisdiction of Santa Ana RWQCB (Region 8) and is subject to the waste discharge requirements of the North Orange County MS4 Permit (Order No. R8-2009-0030) and NPDES Permit No. CAS618030, as amended by Order No. R8-2010-0062. The County of Orange, incorporated cities of Orange County, and the Orange County Flood Control District are co-permittees under the MS4 Permit. Pursuant to the MS4 Permit, the co-permittees were required to develop and implement a drainage area management plan (DAMP) as well as local implementation plans (LIPs), which describe urban runoff management programs for the local jurisdictions. The City of Anaheim, as a Permittee under the General MS4 permit, has legal authority for enforcing the terms of the permit in its jurisdiction.

The General MS4 Permit requires that new development or significant redevelopment projects use best management practices (BMPs), including site design planning, source control, and treatment techniques, to ensure that the water quality of receiving waters is protected. These requirements are detailed in the Orange County Model Water Quality Management Plan (WQMP) and supplemental Technical Guidance Document, updated December 2013, which the City of Anaheim has incorporated into its project approval processes. In the Project Area, any new development project or significant redevelopment project (i.e., adding 5,000 or more square feet of impervious surface) is required to prepare a WQMP that specifies the BMPs and low- impact development (LID) measures that would be implemented to minimize the effects of the project on regional hydrology, runoff flow rates and/or velocities, and pollutant loads. LID is a stormwater management strategy that emphasizes conservation and use of existing site features integrated with distributed stormwater controls that are designed to more closely mimic natural hydrologic patterns of undeveloped sites than traditional stormwater management controls, and to minimize runoff by reducing the elements of

August 2018 Page 5.7-3 BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

development that produce runoff. An Operations and Maintenance Plan must also be included as part of the WQMP and must designate terms, conditions, and requirements for maintaining the BMPs in perpetuity.

County of Orange The County of Orange also regulates storm runoff and water quality as the Principal Permittee under the General MS4 Permit and the DAMP. The City of Anaheim is a co-permittee under the General MS4 Permit and has legal authority for enforcing the terms of the permit in its jurisdiction.

The DAMP includes a New Development and Significant Redevelopment Program. This program incorporates watershed protection and storm water quality management principles into the General Plan process, environmental review process, and development permit approval process. The New Development and Significant Redevelopment Program includes a Model WQMP that defines requirements for project- specific planning, selection, and incorporation of BMPs into new development or redevelopment projects.

City of Anaheim The City of Anaheim has adopted a LIP based upon the County’s DAMP, which includes the Model WQMP. Using the local LIP as a guide, the City approves project-specific WQMPs as part of the development plan and approval process prior to the issuance of permits. All applicants for new development or significant redevelopment projects in the City of Anaheim are required to prepare and submit a WQMP to the Department of Public Works that addresses:

. Regional or watershed programs . Source control BMPs . Site design BMPs . Low impact development BMPs . Treatment control BMPs . Mechanism by which long-term operation and maintenance of all structural BMPs would be maintained Storm Water Pollution Prevention Plans Pursuant to the CWA, in 2001 the SWRCB issued a statewide general NPDES Permit for storm water discharges from construction sites (NPDES No. CAS000002). The current Statewide General Construction Permit is SWRCB Order No. 2009-0009-DWQ, issued in 2009. Under this Statewide General Construction Activity permit, discharges of storm water from construction sites with a disturbed area of one or more acres are required to either obtain individual NPDES permits for storm water discharges or to be covered by the General Permit. Coverage by the General Permit is accomplished by completing and filing Permit Registration Documents with the SWRCB, which include a Notice of Intent (NOI), risk assessment, site map, Storm Water Pollution Prevention Plan (SWPPP), annual fee, and signed certification statement. The Permit Registration Documents are submitted electronically to the SWRCB via the Storm Water Multiple Application and Report Tracking System website. Each applicant under the General Construction Activity Permit must ensure that the SWPPP is prepared prior to grading and is implemented during construction. The SWPPP

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must list BMPs implemented on the construction site to protect storm water runoff and must contain a visual monitoring program; a chemical monitoring program for "non-visible" pollutants to be implemented based on the risk level of the site; and inspection, reporting, training, and recordkeeping requirements. In the Santa Ana Region, the SWRCB is the permitting agency, and the Santa Ana RWQCB provides local oversight and enforcement.

National Flood Insurance Program The National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973 mandate the Federal Emergency Management Agency (FEMA) to evaluate flood hazards. FEMA provides Flood Insurance Rate Maps (FIRMs) for local and regional planners to promote sound land use and floodplain development, identifying potential flood areas based on the current conditions. To delineate a FIRM, FEMA conducts engineering studies referred to as Flood Insurance Studies. The most recent FIRMs for the Project Area (FIRM No. 06059C0128J) were revised on December 3, 2009. Using information gathered in these studies, FEMA engineers and cartographers delineate Special Flood Hazard Areas on FIRMs.

The Flood Disaster Protection Act requires owners of all structures in identified Special Flood Hazard Areas to purchase and maintain flood insurance as a condition of receiving federal or federally related financial assistance, such as mortgage loans from federally insured lending institutions. Community members in designated areas are able to participate in the National Flood Insurance Program (NFIP) afforded by FEMA. The NFIP is required to offer federally subsidized flood insurance to property owners in communities that adopt and enforce floodplain management ordinances that meet minimum criteria established by FEMA. The National Flood Insurance Reform Act of 1994 further strengthened the NFIP by providing a grant program for state and community flood mitigation projects. The act also established the Community Rating System, a system for crediting communities that implement measures to protect the natural and beneficial functions of their floodplains, as well as managing erosion hazards.

The design standard for flood protection established by FEMA is the 100-year flood event, also described as a flood that has a 1-in-100 chance of occurring in any given year. Additionally, FEMA has developed requirements and procedures for evaluating earthen levee systems and mapping the areas affected by those systems. Levee systems are evaluated for their ability to provide protection from 100-year flood events, and the results of this evaluation are documented in the FEMA Levee Inventory System. Levee systems must meet minimum freeboard standards and must be maintained according to an officially adopted maintenance plan. Other FEMA levee system evaluation criteria include structural design and interior drainage.

5.7.1.3 EXISTING CONDITIONS Regional Drainage The Project Area is in the San Gabriel River Watershed (Watershed); most of the part of the Watershed in Orange County is under the jurisdiction of the Santa Ana RWQCB (OCWD 2013). The San Gabriel River originates in the San Gabriel Mountains and travels approximately 58 miles south to the Pacific Ocean in the City of Long Beach. The Watershed spans 689 square miles in Los Angeles, Orange, and San Bernardino counties (see Figure 5.7-1, Regional Drainage). The flow in the river is regulated by the Whittier Narrows Dam

August 2018 Page 5.7-5 BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

and Santa Fe Dam in the Los Angeles Basin and the Morris Dam, San Gabriel Dam, and Cogswell Dam in the San Gabriel Mountains. The Project Area is in the Coyote/Carbon Creek Watershed Management Area of the San Gabriel River Watershed.

Carbon Creek is regulated by Carbon Canyon Dam in the City of Brea. The segment of Carbon Creek in the Project Area is an engineered trapezoidal channel eight feet wide at the bottom and 16.5 feet high and lined with riprap.

Project Area Drainage Most of the Project Area is in Carbon Creek Drainage Basins 1, 2, and 3. The northwest part of the Project Area is in Drainage Basin 1; the northeast and central parts are in Drainage Basin 2; and the southern part is in Drainage Basin 3 (see Figure 5.7-2, Local Drainage). The northernmost part of the Project Area is in the Moody Creek drainage area.

The drainage pattern in the part of the Project Area in the Carbon Creek drainage area is north or south to Carbon Creek. The drainage pattern in the portion of the Project Area in the Moody Creek drainage area is northwest into the City of Buena Park.

The storm drain system in the Project Area consists of Carbon Creek Channel, operated and maintained by the Orange County Flood Control District (OCFCD), and City of Anaheim storm drain pipes—mostly reinforced concrete pipe and ranging from 18 to 60 inches diameter (see Figure 5.7-3, Existing Storm Drainage System).

Planned Storm Drainage Improvements

OCFCD Carbon Creek Channel was built to convey runoff from a 25-year storm event and does not meet the current OCFCD requirement for conveying stormwater from a 100-year flood. OCFCD plans to expand an approximately 1.1-mile segment of Carbon Creek Channel from Western Avenue on the west to Dale Avenue on the east, an including the segment of the channel in the Project Area, to convey a 100-year flood; work is scheduled for fiscal year 2019-2020.

Page 5.7-6 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM Figure 5.7-1 - Regional Drainage 5. Environmental Analysis Bell Gardens Pico Rivera Chino Hills Whittier South Gate

Downey La Habra Brea

Norwalk La Mirada

Paramount

Bellflower Fullerton Yorba Linda

Placentia

Coyote Creek Cerritos Subarea

Buena Park Lakewood

Anaheim Anaheim

Long Beach Cypress

Orange Signal Hill Stanton Los Alamitos

Garden Grove

Tustin Seal Beach Westminster Santa Ana

Pacific Ocean Huntington Beach Esri, USDA Farm Service Agency

Specific Plan Boundary - 282.8 ac San Gabriel River Watershed 0 1 BeachCoyote Boulevard Creek Water Subarea Specific Plan Figure 11 - Regional Watershed Scale (Feet) Source:City ofFuscoe, Anaheim 2018 5/4/2017 Specific Plan Boundary - 282.8 ac San Gabriel River Watershed PlaceWorks Coyote Creek Water Subarea Feet 0 9,000 18,000

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\\CHERON\Projects\AnaheimCaCityOf\381357\GIS\Maps January 22, 2010 BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

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Page 5.7-10 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM Figure 5.7-3 - Storm Drainage System 5. Environmental Analysis

BEACHBEACH BLVDBLVD

A A

DALEAVE

T DALEAVE

W 39" RCP 39"

42"RCP 36"RCP 24" RCP 54" RCP LINCOLNLINCOLN AVEAVE 48"RCP LINCOLNLINCOLN AVEAVE

3 42"

0 6 C a r b o n C r e e k

DELANO ST

96"

C P 24"RCP RCP

R 30"

R RCP

8 4 Carbon Creek ORANGE AVE ORANGE AVE

30" RCP

5 P 1

C " R P

C C

P R

HAYWARD ST HAYWARD

2 C 4 " R

R " C P

P C

5 C R

63"RCP 3 60"RCP 57" RCP BALL RD BALL RD BALLBALL RDRD

WESTERN AVE

BEACH BLVD BEACH

DALE AVE DALE DALE AVE DALE

Specific Plan Boundary - 282.8 ac Storm Drain Lines Aerial Date: 09/23/2016 0 600 BeachCatch Basins BoulevardStorm Specific Drain Manholes Plan City of Anaheim Storm Drain Lines Figure 4 - Existing Storm Drain Scale (Feet) Source: Fuscoe,City of 2018 Anaheim OCFCD Storm Drain Line (Carbon Creek) 8/4/2017 Specific Plan Boundary - 282.8 ac Storm Drain Lines Catch Basins City of Anaheim Storm Drain Lines PlaceWorks Feet Storm Drain Manholes OCFCD Storm Drain Line (Carbon Creek) 0 600 1,200

X:\Projects\511\24\01\MXD\Exhibits\SpecificPlan\Fig4_BeachBlvdSP_ExStormDrain_170123.mxd BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

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Page 5.7-12 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

City of Anaheim The City of Anaheim completed master plans of storm drainage for Carbon Creek and Moody Creek tributary areas in 2010. The master plans identified three priority levels for improvements:

. Priority 1: Proposed new storm drain in roadway where there is no existing storm drain providing 10- year to 100-year flood protection levels.

. Priority 2: Proposed parallel or replacement storm drain in roadway to achieve 100-year flood protection.

. Priority 3: Proposed new storm drain in a local street where 100-year flood protection is currently met through sheet flow in the street; however, the storm drain is needed to achieve 10-year flood protection level.

The master plans identified seven Priority One segments next to the Project Area, four Priority Two segments in the Project Area, and one Priority Three segment next to the Project Area. The Priority One and Two segments are all in the Carbon Creek Master Plan area, and the Priority Three segment is in the Moody Creek master plan area. Recommended storm drains range in size from a 24-inch reinforced concrete pipe to a 10- by-8-foot box.

The planned improvements are listed in Table 4 of the Infrastructure Technical Report (see Appendix G to this DEIR) and are mapped on Figure 5.7-4, Existing Storm Drain Deficiencies.

Groundwater The Project Area lies in the Orange County Groundwater Basin (OC Basin), which underlies the northern half of Orange County, covering approximately 350 square miles (OCWD 2015) (see Figure 5.7-5, Orange County Groundwater Basin). The OC Basin is bordered by the Coyote and Chino Hills to the north, the Santa Ana Mountains to the northeast, and the Pacific Ocean to the southwest and terminates near the Orange County boundary to the northwest, where it connects to the Central Basin of the Los Angeles Groundwater Basin. The hydrogeology of the OC Basin is characterized by a deep structural alluvial basin containing a thick accumulation of interbedded sand, silt, and clay. The California Department of Water Resources has divided the Basin into two zones, the Forebay and the Pressure areas. The Project Area is in the Pressure Area, where large quantities of surface water and near-surface groundwater is impeded from percolating into the major producible aquifers by clay and silt layers at shallow depths (upper 50 feet) (OCWD 2015).

Groundwater in the OC Basin is managed by OCWD. Groundwater is extracted from more than 500 production wells in the basin. The water supply system also includes 800 monitoring wells, more than 1,000 acres of recharge ponds, two seawater intrusion barriers, three desalters, the Groundwater Replenishment System, the Prado wetlands, and Prado Dam (OCWD 2015). Groundwater levels under the Project Area in 2013 and 2014 were about 30 feet below mean sea level—that is, about 100 to 105 feet below ground surface (OCWD 2015). There are no groundwater recharge facilities in or next to the Project Area.

August 2018 Page 5.7-13 BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

Water Quality As previously discussed, the Project Area is in the San Gabriel River Watershed. More specifically, runoff from development in the area would eventually discharge to Carbon Creek and Moody Creek, both of which are tributary to Coyote Creek and thence to the San Gabriel River. The Santa Ana RWQCB adopted the Water Quality Control Plan for the Santa Ana River Basin (Basin Plan) in 1995, with the latest revision in 2011 that lists potential and beneficial uses for surface waters and groundwater in the region. There are listings for one surface water in the Project Area: Carbon Creek. For groundwater, the Lower Santa Ana River Basin, Orange Groundwater Management Zone is listed. The potential and beneficial uses for these surface and groundwater bodies are summarized in Table 5.7-1.

Table 5.7-1 Designated Beneficial Uses of Water Bodies Water Body Designated Beneficial Use Surface Water Carbon Creek MUN, GWR, RARE, REC-1, REC-2, WARM, WILD, RARE Groundwater Lower Santa Ana River Basin (Orange) MUN, AGR, IND, PROC Source: Fuscoe 2017.

The potential and existing beneficial uses are:

. AGR – Agricultural supply . RARE – Preservation of rare and endangered species . GWR – Groundwater recharge . REC-1 – Water contact recreation2 . IND – Industrial service supply . REC-2 – Non-contact water recreation . MUN – Municipal and domestic supply1 . WARM – Warm freshwater habitat . PROC – Industrial process supply . WILD – Wildlife habitat . RARE – Habitat for threatened or endangered species In accordance with Section 303(d) of the CWA, the state must present EPA with a list of impaired water bodies that do not meet water quality standards. The only impaired water body in the Project Area is Carbon Creek, which was listed as impaired for chloride and sulfates in 2010. Once a water body has been placed on the 303(d) list of impaired waters, states are required to develop a TMDL to address each pollutant causing impairment. A TMDL defines how much of a pollutant a water body can tolerate and still meet water quality standards. TMDLs for Carbon Creek are planned to be issued in 2019 to 2021.

The Basin Plan also contains water quality criteria for groundwater (Santa Ana RWQCB 2011). The Project Area is in the Lower Santa Ana River Sub-basin of the Orange County Groundwater Basin.

1 Industrial service supply consists of industrial uses not dependent on water quality, such as cooling water and hydraulic conveyance. Industrial process supply consists of industrial uses dependent on water quality, such as food processing. 2 Water contact recreation is activities involving body contact with water where ingestion of water is reasonably possible, such as swimming, wading, and fishing.

Page 5.7-14 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM Figure 5.7-4 - Existing Storm Drainage Deficiencies 5. Environmental Analysis

BEACHBEACH BLVDBLVD

A A

DALEAVE

T DALEAVE

S S City Priority 3 E

W InstallW New 30-36" SD

City Priority 1 Install New 36" SD 39" RCP 39"

42"RCP 36"RCP 24" RCP 54" RCP LINCOLNLINCOLN AVEAVE 48"RCP LINCOLNLINCOLN AVEAVE

City Priority 1 9

3 42" Install New 24" SD P

0 6 C a r b o n C r e e k

DELANO ST

96"

C P 24"RCP RCP

" City Priority 1

4 City Priority 2 Install New 42" SD Add Parallel 30" SD

R 30"

OCFCD Planned Project C

R RCP FY 2019 - 2020 "

8 4 Carbon Creek ORANGE AVE ORANGE AVE

City Priority 1 Install New 54" SD City Priority 1 Install New 30" SD

30" RCP

5 P 1

C " R P

C C

P R

HAYWARD ST HAYWARD

2 C 4 " R

R " C P

P C

5 C R

63"RCP 3 60"RCP 57" RCP BALL RD BALL RD BALLBALL RDRD

City Priority 2 Upsize to 66"-96" SD or

9'x6'-10'x8' box C

WESTERN AVE

BEACH BLVD BEACH

DALE AVE DALE DALE AVE DALE

Storm Drain Lines City Priority 1 OCFCD Carbon Creek 2019-2020 Specific Plan Boundary - 282.8 ac Aerial Date: 09/23/2016 City of Anaheim New Storm Drains Improvements Storm Drain Storm Drain Lines 0 600 BeachCatch Basins Boulevard Specific Plan City PriorityFigure 2 6 - ExistingCity Priority Storm 3 Drain Deficiencies Manholes OCFCD Storm Drain Line Storm Drains Scale (Feet) Source: Fuscoe,City of 2018 Anaheim Specific Plan Boundary - Storm Drain Lines New Storm Drains 8/7/2017 282.8 ac (Carbon Creek) City Priority 1 Improvements OCFCD Carbon Creek City of Anaheim Storm New Storm Drains 2019-2020 Improvements Catch Basins Drain Lines PlaceWorks City Priority 2 City Priority 3 Feet Storm Drain Manholes OCFCD Storm Drain Line Storm Drain 0 600 1,200 (Carbon Creek) Improvements New Storm Drains

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Page 5.7-16 PlaceWorks Section 3 Basin Hydrogeology encompasses most of the cities of Anaheim, Fullerton, and Villa Park and portions of the cities of Orange and Yorba Linda. The Pressure Area is generally defined as the area of the basin where large quantities of surface water and near-surface groundwater is impeded from percolating into the major producible aquifers by clay and silt layers at shallow depths (upper 50 feet). The Principal and BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR Deep Aquifers in this area are under “confined” conditions (under hydrostatic pressure);CITY OF ANAHEIM the water levels of wells penetrating these aquifers exhibit large seasonal variations. Most of the central and coastal portions of the basin fall Figurewithin the5.7-5 Pressure - Orange Area. County Groundwater Basin 5. Environmental Analysis

Site

Sub-Basin Boundary Forebay/Pressure Line DWR Groundwater Basins (Bulletin 118) OCWD Boundary Aquifer Condition Unconfined Confined

Figure 3-3: Orange County Groundwater Basin

OCWD Groundwater Management Plan 2015 Update 3-4

0 4 Scale (Miles) Source: Orange County Water District, 2015 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

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Page 5.7-18 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

Salinity is a significant water quality problem in many parts of southern California, including Orange County. Salinity is a measure of the dissolved minerals in water including both total dissolved solids (TDS) and nitrates. The portions of the groundwater basin with the highest levels are generally in the cities of Irvine, Tustin, Yorba Linda, Anaheim, Placentia, and Fullerton. OCWD continually monitors the levels of TDS in wells throughout the OC Basin. The TDS concentration in the OC Basin is expected to decrease over time as recycled water is used to recharge the OC Basin through the Groundwater Replenishment System.

Nitrates are one of the most common and widespread contaminants in groundwater supplies, originating from fertilizer use, animal feedlots, wastewater disposal systems, and other sources. The maximum contaminant level for nitrate in drinking water is 10 mg/L. OCWD regularly monitors nitrate levels in groundwater and works with producers to treat wells that have exceeded safe levels of nitrate concentrations. OCWD manages the nitrate concentration of water recharged by its facilities to reduce nitrate concentrations in groundwater.

Other contaminants that OCWD monitors within the OC Basin include:

. Methyl Tertiary Butyl Ether . Volatile Organic Compounds . NDMA . 1-4-Dioxane . Perchlorate . Selenium . Constituents of Emerging Concern Flood Hazards Designated Flood Zones FEMA determines floodplain zones in an effort to assist cities in mitigating flooding hazards through land use planning. FEMA also outlines specific regulations for any construction in a 100-year floodplain. The 100- year floodplain is defined as an area that has a 1 percent chance of being inundated during a 12-month period. This has been established as the base flood for purposes of floodplain management measures. FEMA also prepares maps for 500-year floods, which mean that in any given year, the risk of flooding in the designated area is 0.2 percent. The FIRM for the Project Area, No. 06059C0128J, was prepared in 2009.

Carbon Creek is a designated 100-year flood zone (Zone A). Approximately 0.8 acre next to the west boundary of the Project Area in Twila Reid Park is designated Zone AO, that is, a 100-year flood zone with average flood depths ranging from one to three feet (see Figure 5.7-6, Flood Zones).

5.7.2 Thresholds of Significance According to Appendix G of the CEQA Guidelines and the City of Anaheim’s CEQA thresholds, a project would normally have a significant effect on the environment if the project would:

August 2018 Page 5.7-19 BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

HYD-1 Violate any water quality standards or waste discharge requirements.

HYD-2 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 pre-existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted.

HYD-3 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 a substantial erosion or siltation on- or off-site.

HYD-4 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.

HYD-5 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.

HYD-6 Otherwise substantially degrade water quality.

HYD-7 Place housing within a 100-year flood hazard area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood hazard delineation map.

HYD-8 Place within a 100-year flood hazard area structures which would impede or redirect flood flows.

HYD-9 Expose people or structures to a significant risk of loss, injury or death involving flooding, including flooding as a result of the failure of a levee or dam.

HYD-10 Be subject to inundation by seiche, tsunami, or mudflow.

HYD-11 Substantially degrade water quality by contributing pollutants from areas of material storage, vehicle or equipment fueling, vehicle or equipment maintenance (including washing), waste handling, hazardous materials handling, or storage, delivery areas, loading docks or other outdoor work areas.

HYD-12 Substantially degrade water quality by discharge which affects the beneficial uses (i.e., swimming, fishing, etc.) of the receiving or downstream waters.

HYD-13 Potentially impact stormwater runoff from construction activities.

HYD-14 Potentially impact stormwater runoff from post-construction activities.

HYD-15 Create the potential for significant changes in the flow velocity or volume of stormwater runoff to cause environmental harm.

HYD-16 Create significant increases in erosion of the Project Area or surrounding areas.

Page 5.7-20 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM Figure 5.7-6 - Flood Zones 5. Environmental Analysis

BEACHBEACH BLVDBLVD

A A

DALEAVE

T DALEAVE

LINCOLNLINCOLN AVEAVE LINCOLNLINCOLN AVEAVE

AH X A C a r b o n C r e e k

DELANO ST

AO Carbon Creek ORANGE AVE ORANGE AVE

A AO

X X X

HAYWARD ST HAYWARD

BALL RD BALL RD BALLBALL RDRD

WESTERN AVE

BEACH BLVD BEACH

DALE AVE DALE DALE AVE DALE

Specific Plan Boundary - 282.8 ac FEMA Flood Zone Aerial Date: 09/23/2016 Beach Boulevard Specific PlanZone A Zone AO Figure 7 - Flood0 Zone600 Map Scale (Feet) Source: Fuscoe,City of 2018 Anaheim Zone AH Zone X 2/27/2017 Specific Plan Boundary - 282.8 ac FEMA Flood Zone Zone AH Zone X Zone A PlaceWorks Zone AO Feet 0 600 1,200

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Page 5.7-22 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

The Initial Study included as Appendix A to this DEIR substantiates that impacts associated with the following thresholds would be less than significant: HYD-9, HYD-10, and HYD-11. These impacts will not be addressed in the following impact analysis.

5.7.3 Environmental Impacts The applicable thresholds are identified in brackets after the impact statement.

Impact 5.7-1: Development pursuant to the Proposed Project could increase the amount of impervious surfaces in the Project Area and could therefore increase surface water flows and the potential for erosion and siltation and for exceeding the capacity of existing or planned storm drain systems. [Thresholds HYD-3, HYD-4, HYD-5, HYD-15, HYD-16]

Impact Analysis:

Impervious Surfaces, Surface Water Flows, and Storm Drainage Under existing conditions the Project Area is 60 percent impervious north of Carbon Creek Channel and 69 percent impervious south of the channel. At buildout of the Proposed Project, the Project Area would be 75 to 82 percent impervious north of the channel and 60 to 65 percent impervious south of the channel. Using the upper ranges of estimates of percent impervious area at buildout of the Proposed Project, buildout is estimated to cause a net increase of about 24 acres of impervious areas, as shown in Table 5.7-2.

Table 5.7-2 Net Increase in Impervious Area, acres Percent Impervious Net Increase in Proposed Project Net Increase Impervious Area, Portion of Site Acres Buildout Existing (worst-case scenario) acres North of Carbon Creek 136 75-82% 60% 22% 29.9 Channel South of Carbon Creek 147 60-65% 69% -4% -5.9 Channel Total 283 — — — 24.0 Source: Fuscoe 2017.

This could result in an increase in storm water runoff, higher peak discharges to drainage channels, and the potential to cause erosion or sedimentation in drainage swales and streams. Increased runoff volumes and velocities could create nuisance flooding in areas without adequate drainage facilities.

The County of Orange and City of Anaheim require as a standard condition of approval that all new development or significant redevelopment projects complete drainage and hydrology analyses to ensure that on-site and off-site drainage facilities can accommodate increased storm water flows. Implementation of these provisions, which include LID design, BMPs, and possibly on-site retention basins, would minimize increases in peak flow rates or runoff volumes. All new development or significant redevelopment project applicants would also be required to prepare a WQMP for submittal to the City of Anaheim’s Department of

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Public Works that describes the BMPs and site design measures that would be implemented to minimize storm runoff. As part of the WQMP, treatment control BMPs are required that would infiltrate and/or treat the runoff produced from a rainfall intensity of 0.2 inch/hour. This requirement would reduce any net increase in stormwater flows due to buildout of the Proposed Project.

New development or redevelopment projects would need to construct adequately sized storm drainage systems to convey on-site storm water runoff to existing storm drain facilities. The City of Anaheim Department of Public Works has an ongoing storm drainage master planning program that includes the Project Area. The drainage master plans for Carbon Creek Channel and Moody Creek Channel were completed in 2010. Several storm drains with inadequate capacity for 100-year flood flows were identified; several other roadway segments were identified without existing storm drains providing 10-year or greater flood protection levels; and one roadway segment was identified next to the Project Area where the street has capacity to convey 100-year flood flows but a storm drain with capacity for a 10-year flood is needed. Storm drain improvements on and next to the Project Area recommended in the two master plans are shown on Figure 5.9-4. The infrastructure technical report recommends construction of the identified improvements as funding becomes available.

Drainage Impacts in Specific Parts of the Project Area The Infrastructure Technical Report includes assessment of drainage impacts of development of some specific portions of the Project Area.

. Westgate Property: Approximately 30 acres in total of vacant land in the northeast corner of the Project Area: Five new drainage systems and a parkway culvert would be needed in the Project Area; the new infrastructure would connect to existing storm drains. No needed improvements to existing storm drains downstream of the property were identified.

. Other vacant land north of Carbon Creek Channel: There are three other areas of vacant land totaling about five acres in the Project Area north of Carbon Creek Channel. The City may require developers of projects in these areas to implement detention systems to control proposed flows from a certain storm event frequency to match existing flows. Detention systems are typically designed to handle the ten-year storm event, but the City could require a larger event like a 25-year storm event for detention design, depending on site conditions.

. Vacant land along Cheryllyn Lane and redevelopment of seven single-family residences at Beach Boulevard and Stonybrook Drive, both south of Carbon Creek Channel: Project buildout would involve development of approximately one acre of vacant land north of Cheryllyn Lane and redevelopment of seven single-family houses next to the intersection of Beach Boulevard at Stonybrook Drive; both areas are south of Carbon Creek Channel. The storm drain lines that serve these areas do not have any deficiencies and have sufficient capacity to accommodate minor increases in storm water runoff due to increases in imperviousness. In addition, LID BMPs would be required for this type of development and all other redevelopment that has the potential to retain stormwater flows on site and reduce runoff. Per Orange County Public Works, if a proposed project has the potential to improve on-

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site drainage conditions that shift flooding potential elsewhere, including outside the project area, on-site detention systems may be required.

Storm drainage impacts would be less than significant after construction of the needed storm drainage improvements identified for the Westgate Property and implementation of BMPs required by the County and the City of Anaheim.

Erosion and Siltation Project Design County and City requirements for new development or redevelopment projects would include site design BMPs and LID BMPs. Site design BMPs include minimizing impervious areas and directly connected impervious areas, and inclusion of infiltration basins and detention or retention basins in project designs. LID BMPs also include infiltration; storm water harvest and use; and bioretention and biofiltration. The use of site design and LID BMPs would reduce runoff, thus reducing erosion, and filter some sediment out of storm water.

Project Construction Future development in the Project Area would involve construction activities that could increase the potential for erosion and/or siltation. However, none of the future development would alter the course of an existing stream or river. The Proposed Project would designate Carbon Creek Channel as Flood Control Channel. The channel is owned by OCFCD, is required for flood control, and is not available for development with other land uses. The channel does not currently have a zoning designation. Standard erosion control measures would be implemented as part of the SWPPP for any proposed project disturbing greater than one acre, to minimize the risk of erosion or sedimentation during construction; all other construction projects permitted by the City are required to implement applicable BMPs. The SWPPP must include an erosion control plan that prescribes measures—such as phasing of grading, limiting areas of disturbance, designation of restricted-entry zones, diversion of runoff away from disturbed areas, protective measures for sensitive areas, outlet protection, and provisions for revegetation or mulching. The erosion control plan would also include treatment measures to trap sediment once it has been mobilized, including inlet protection, straw bale barriers, straw mulching, straw wattles, silt fencing, check dams, terracing, and siltation or sediment ponds. With implementation of these measures during construction, any erosion or siltation impacts would be less than significant.

Project Operation Once projects in the Project Area have been constructed, the county and City requirements for new development or redevelopment would include source control measures and treatment control measures that address storm water runoff and would reduce the potential for erosion or siltation. Impacts would be less than significant after implementation of such requirements.

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Impact 5.7-2: Development pursuant to the Proposed Project would increase the amount of impervious surfaces in the Project Area and would impact opportunities for groundwater recharge. [Threshold HYD-2]

Impact Analysis: Future development in the Project Area is anticipated to result in a net increase of about 24 acres of impervious surfaces. Such increase would reduce infiltration, which could lead to reduced groundwater recharge. Applicants for new development or significant redevelopment would be required to implement site design measures, LID, and BMPs, including infiltration features that would contribute to groundwater recharge and minimize storm water runoff. In addition, future development would not interfere with groundwater recharge that takes place in OCWD recharge basins east of the Project Area. There are no recharge basins in the Project Area.

Depths to groundwater under the Project Area range from about 100 to 105 feet below ground surface. Therefore, it is not expected that construction activities would encounter groundwater and require dewatering.

The City of Anaheim owns and operates a network of groundwater wells to supply potable water to their users (Anaheim 2004). The City receives approximately 79 percent of its water supply from groundwater and 21 percent from imported water. Buildout of the Proposed Project could lead to an increased demand for water, which could lead to an increase in groundwater pumping. However, in accordance with the Orange County Water District Act, the City pays the OCWD a replenishment assessment for the amount of groundwater extracted. This is used by OCWD for various groundwater replenishment programs to ensure that no overdraft of local groundwater resources occurs. Thus, water demand from maximum buildout in the Project Area would not deplete groundwater resources.

Impact 5.7-3: During implementation of the Proposed Project, there is the potential for short-term unquantifiable increases in pollutant concentrations from the Project Area. After project development, the quality of storm runoff (sediment, nutrients, metals, pesticides, pathogens, and hydrocarbons) may be altered. [Thresholds HYD-1, HYD-6, HYD-12, HYD-13, and HYD-14]

Impact Analysis:

Construction Buildout of the Proposed Project could result in changes to storm water runoff and water quality during construction activities. Storm water runoff could contain pollutants such as soil and sediments that are released during grading and excavation activities, and petroleum-related pollutants due to spills or leaks from heavy equipment and machinery. Other common pollutants that can result from construction activities include solid or liquid chemical spills; concrete and related cutting or curing residues; wastes from paints, stains, sealants, solvents, detergents, flues, acids, lime, plaster, and cleaning agents; and heavy metals from equipment. The storm water runoff flows into storm drain inlets in the Project Area and eventually discharges into Carbon Creek, Coyote Creek, the Santa Gabriel River, and Pacific Ocean. All four of those water bodies are considered impaired, and pollutants in storm water could further degrade water quality.

Page 5.7-26 PlaceWorks BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis HYDROLOGY AND WATER QUALITY

However, all projects in the Project Area that involve construction activities that disturb one or more acres of land would be required to obtain a NPDES permit from the SWRCB, including submittal of an NOI and preparation of a SWPPP. The SWPPP includes BMPs to reduce water quality impacts, including various measures to control on-site erosion; to reduce sediment flows into storm water; to control wind erosion; to reduce tracking of soil and debris into adjacent roadways and off-site areas; and to manage wastes, materials, wastewater, liquids, hazardous materials, stockpiles, equipment, and other site conditions to prevent pollutants from entering the storm drain system. Inspections, reporting, and storm water sampling and analysis are also required to ensure that visible and non-visible pollutants are not discharged off-site.

Implementation of the provisions of the NPDES permit and compliance with City grading requirements would minimize construction impacts from future development in the Project Area through the implementation of BMPs that reduce construction-related pollutants. This would ensure that any impacts to downstream waters resulting from construction activities associated with new development or significant redevelopment would be less than significant. In addition to the requirements of the NPDES permit, grading and building permit requirements include the reduction of erosion and sedimentation impacts during construction. Full compliance with applicable local, state, and federal regulations would reduce water quality impacts associated with construction to a less than significant level.

Operational Potential pollutants that could be generated by maximum buildout of the Proposed Project include bacteria/viruses, heavy metals, nutrients, pesticides, organic compounds, sediment, trash and debris, oxygen- demanding substances, and oil and grease. Specific pollutants would depend on the type of land use and site improvements proposed by individual projects.

All applicants for future new development and significant redevelopment in the Project Area would be required to prepare an individual WQMP that identifies (1) potential pollutants of concern that would be generated by the project, and (2) the site and hydrologic conditions of concern at downstream locations. The WQMP would identify permanent site design, source-control, and treatment-control BMPs that would be implemented as part of the project, including maintenance responsibilities and funding sources, and would provide a long-term commitment to implementation. Preparation and implementation of WQMPs for new development and redevelopment projects would satisfy MS4 permit requirements and would ensure that the City complies with water quality regulations for storm water runoff.

Future development in the Project Area would also need to comply with the City’s NPDES ordinance that prohibits the discharge of certain pollutants into storm water; prohibits illicit connections to the storm drain system; requires implementation of permanent BMPs; and requires local discharge permits for non-storm water discharges into the storm drain system.

The Santa Ana RWQCB also requires industrial projects and land uses that generate storm water or discharges that can directly affect water courses or water bodies to obtain individual Waste Discharge Permits (WDRs) and/or water quality certifications. Compliance with WDR conditions of approval and/or water quality certifications would prevent the violation of water quality standards.

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Implementation of these programs and regulatory requirements would reduce storm water pollutants that could affect water quality in the Santa Ana River and/or the Pacific Ocean, thus reducing impacts related to storm water pollution and water quality to less than significant levels.

Impact 5.7-4: The Proposed Project would not result in any flooding safety impacts due to placing structures within a 100-year flood (one percent chance of flooding) hazard area. [Thresholds HYD-7 and HYD-8]

Portions of the Project Area within the 100-year floodplain are Carbon Creek Channel and approximately 0.8 acre in Twila Reid Park next to the west Project Area boundary. Twila Reid Park would be retained under the Proposed Project and designated a Public-Recreational development area. Thus, buildout of the Proposed Project would not involve development of land uses in Twila Reid Park that would pose substantial flood hazards to people or structures. Carbon Creek Channel would remain a flood control channel under the Proposed Project. Implementation of the Proposed Project would not involve development of structures that would impede or redirect flood flows. Impacts would be less than significant.

5.7.4 Cumulative Impacts Surface Water, Drainage, and Flood Hazards The cumulative study area with regard to surface water, drainage, and flood hazards is the San Gabriel River Watershed. The part of the Watershed outside of the Santa Ana RWQCB’s jurisdiction is in the jurisdiction of the Los Angeles RWQCB. Other projects would increase the amount of impervious area in the Watershed, potentially increasing runoff, drainage volumes, and contributing to flood hazards. Other projects would be required to implement site design, LID, and treatment control BMPs pursuant to MS4 permits of the two relevant RWQCBs. Implementation of such BMPs would reduce impervious areas on development sites, and would involve infiltration, stormwater harvest and reuse, bioretention, and biofiltration. Runoff from development and redevelopment sites from storms of specified intensities would be limited to no greater than predevelopment runoff rates or volumes. Jurisdictions in the Watershed regulate development within 100-year flood zones to minimize hazards to public safety and alterations of flood flows. With regard to the existing storm drain system, compliance with local, state, and federal regulations to minimize storm water runoff from individual projects in conjunction with the City’s ongoing storm drainage master planning program and capital improvements would ensure that adequate storm drain infrastructure is constructed to serve existing and future developments. Cumulative impacts to surface water, drainage, and flood hazards would be less than significant, and project impacts would not be cumulatively considerable.

Groundwater The cumulative study area respecting groundwater is the Orange County Groundwater Basin (OC Basin). Other projects in the OC Basin would increase the amount of impervious area and thus could reduce groundwater recharge. Other projects would also increase total land use intensity and therefore would increase water demands. Other projects would involve implementation of the categories of BMPs described above, thus minimizing impacts to groundwater recharge. Other projects would comply with laws and policies requiring water conservation, thus limiting increases to water demands. Payment of the replenishment

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assessment to the OCWD by the City and other agencies that extract groundwater from the Basin would allow the OCWD to continue its program to protect groundwater resources and to recharge the local aquifers in order to prevent overdraft. No significant cumulative impact would occur.

Water Quality The cumulative study area for water quality is the part of Orange County in the jurisdiction of the Santa Ana RWQCB. Other projects could result in a cumulatively considerable impact to water quality due to construction activities and increases in post-development runoff. All construction projects that involve the disturbance of one or more acres of land are subject to the NPDES Construction Permit requirements for implementation of individual SWPPPs, which outline erosion control, sediment control, wind erosion control, tracking control, non-storm water management and waste management, and materials pollution control BMPs. Additionally, new development and significant redevelopment projects are required to prepare and implement WQMPs for long-term implementation and maintenance of source-control, site design, and treatment-control BMPs to ensure compliance with water quality goals and compliance with the City’s NPDES ordinance. Thus, pollutants generated in the Project Area and cumulative projects in the Basin would be mitigated during construction activities and project operation. Compliance with the Santa Ana RWQCB’s requirements for WDRs and/or water quality certifications would also prevent long-term storm water quality impacts. No significant cumulative impact would occur.

5.7.5 Existing Regulations and Standard Conditions State

. NPDES General Construction Permit. NOI and SWPPP Requirements . SWRCB General Industrial Activities Storm Water Permit Regional

. Santa Ana RWCB Waste Discharge Permits (WDRs) and Water Quality Certifications . Orange County MS4 Permit . Orange County Model Water Quality Management Plan (WQMP) and Technical Guidance Document . Orange County Drainage Area Management Plan (DAMP). New Development/Significant Redevelopment Program

. Orange County Hydrology Manual and 1996 Addendum . Orange County Water District (OCWD) Groundwater Replenishment Program . Orange County and City of Anaheim Local Implementation Plan (LIP)

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City of Anaheim

. City of Anaheim General Plan, Public Services and Facilities Element . City of Anaheim General Plan, Green Element . City of Anaheim General Plan, Safety Element . City of Anaheim Municipal Code, Chapter 10.09, NPDES Program . City of Anaheim Municipal Code, Chapter 10.20, Construction and Destruction of Wells . City of Anaheim Municipal Code, Chapter 17.04, Grading Permits . City of Anaheim Municipal Code, Chapter 17.28, Flood Hazard Reduction 5.7.6 Level of Significance Before Mitigation Upon implementation of regulatory requirements and standard conditions of approval, the following impacts would be less than significant: 5.7-1 through 5.7-4.

5.7.7 Mitigation Measures No mitigation measures are necessary.

5.7.8 Level of Significance After Mitigation The existing regulations and standard conditions would reduce potential impacts associated with hydrology and water quality to a level that is less than significant without mitigation. Therefore, there are no significant unavoidable adverse impacts relating to hydrology.

5.7.9 References Corpuz, Ariel (Senior Civil Engineer). 2017, June 28. Phone call. OC Public Works.

Orange County Public Works (OCPW). 2017b, June 14. Santa Ana River Project: Project Cost and Schedule. http://www.ocflood.com/sarp/cost.

———. 2017a, November 15. Seven Oaks Dam. http://www.ocflood.com/sarp/7oaks.

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