CITY of RICHLAND Determination of Non-Significance Description of Proposal
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File No. EA2019-124 CITY OF RICHLAND Determination of Non-Significance Description of Proposal: Installation of approximately 2,500 lineal feet of 8” domestic water mainline. The project will initiate at the intersection of Leslie Road and Rachel Road and consists of approximately 890 lineal feet of directional boring under the West Fork Amon Creek across property owned by the City of Richland and within approximately 1,615 lineal feet of open trench located within the right of way of the proposed Center Parkway extending from the Clearwater Creek subdivision. Proponent: Hayden Homes. Location of Proposal: The project site is located east of the Leslie Road and Rachel Road intersection upon Assessor’s Parcel Numbers 101882000001003 and 101882000001002 within the West ½ of Section 1, Township 8 North, Range 28 East, W.M., Richland, WA. Lead Agency: City of Richland The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. ( ) There is no comment for the DNS. ( X ) This DNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for fourteen days from the date of issuance. ( ) This DNS is issued after using the optional DNS process in WAC 197-11-355. There is no further comment period on the DNS. Responsible Official: Mike Stevens Position/Title: Planning Manager Address: 625 Swift Blvd., MS #35, Richland, WA 99352 Date: August 27, 2019 Signature______________________________ MEMORANDUM DATE: July 25, 2019 TO: Hayden Homes LLC 2464 SW Glacier Place, Suite 100 Redmond, OR 97756 FROM: Brian Bieger, Senior Scientist/Project Manager PROJECT: Clearwater Creek Waterline Project, PBS Project 66192.000 REGARDING: Critical Areas Assessment – Wildlife Habitat Introduction PBS Engineering and Environmental Inc. (PBS) was contracted by Hayden Homes LLC to conduct a habitat assessment on a parcel within the City of Richland (City), Washington in anticipation of a municipal waterline installation project. The purpose of the habitat assessment was to identify any evaluate the occurrence of wetlands and fish and wildlife habitat areas along the project alignment as defined in Chapter 22.10 of the City of Richland Municipal Code (RMC). Following the background investigation, a site visit was completed on July 22, 2019 by Senior Scientist Brian Bieger. Mr. Bieger has over 15 years of professional experience in natural resource assessments. The details of the assessment are detailed below. Background Information The project site is located in the southwest portion of the City, immediately east of the intersection of Rachel Road and Leslie Road (Figure 1). Existing background information for the property was reviewed prior to completing a site visit. This included a review of WDFW Online Priority Habitat and Species (PHS) Map viewer, current and historic aerial photographs, National Wetland Inventory (NWI) maps, and USGS topographic maps. The site is located within the Pleistocene Lake Basin level IV ecoregion within the Columbia Plateau ecoregion. This area is characterized by level to undulating lake plain that historically contained Pleistocene lakes following flooding from glacier lakes Missoula and Columbia. This area is one of the driest climates within the Columbia Plateau with annual precipitation averaging between 7 to 10 inches. The present day landscape is characterized by sagebrush steppe grasslands in addition to irrigated agriculture lands and to a much smaller extent, developed urban lands. Aerial photographs show the project site as undeveloped. Surrounding land uses include high- density residential subdivisions and vacant lands. The topography of the site ranges from flat to sloping. The site gently slopes from the east and west towards the central portion of the site where Amon Creek and adjacent wetlands are located (Figure 2). The WDFW priority habitat and species maps indicate the following priority species and habitats mapped within the proximity of the project area: • Amon Creek • Wetlands • Shrub-steppe habitat 415 W 6TH STREET, SUITE 601 . VANCOUVER, WA 98660 . 360.695.3488 MAIN . 866.727.0140 FAX . PBSUSA.COM Hayden Homes LLC Habitat Assessment January 24, 2019 Page 2 • Ferruginous hawk breeding and nesting areas (both county scale data) • Townsend’s ground squirrel (mapped concentration) • Spring and Fall chinook occurrence/Migration • Burrowing owl • Ring-neck pheasant is not mapped but was auditorily identified during the field visit. NWI maps of the site indicate the presence of palustrine emergent and scrub-shrub wetlands in the central portions of the site (Figure 3). Aerial photographs confirm that there is a complex of wetlands and open water areas along the Amon Creek drainageway that runs north south through the central portion of the site. Methods A site visit was completed on July 22, 2019 in order to determine and record the wetland boundaries within the project area and document the existing conditions of the site in terms of vegetation, wildlife observed, and other noteworthy observations. Wetland boundaries were determined using the routine approach of the US Army Corps of Engineers (USACE) Wetlands Delineation Manual (Environmental Laboratory, 1987) and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region Supplement (Version 2.0) (Supplement) (US Army Corps of Engineers, 2010). Soils, vegetation, and indicators of hydrology were recorded at sample plot locations on standard wetland determination data forms in areas where wetlands were suspected. Wetland plant ratings were assigned based on the 2016 National Wetland Plant List (Lichvar et al., 2016). No modification of the standard methodologies was necessary during the assessment. In addition to identification of and recording of wetland boundaries, the ordinary high watermark (OHWM) of Amon Creek was identified and mapped in the field. Positions of these features were recorded in the field with a Trimble Geo7X handheld GPS unit. This unit has sub-meter accuracy when the data is post processed. General notes on vegetation, landscape features, and conditions on the site were recorded. Results The project site comprises a long skinny corridor that extends east from the stub out of Rachel Road (Figure 1). The proposed waterline project will extend further east outside of the study area but all of the identified critical areas are concentrated within the project area defined in this report. The project area crosses the Amon Creek Nature Preserve which contains unimproved walking trails along the east side of the Amon Creek riparian area. Vegetation across the site is fairly homogenous except for the areas within the wetland and riparian corridors. Dominant vegetation includes big sagebrush (Artemisia tridentata), cheatgrass (Bromus tectorum) and rush skeletonweed (Chondrilla juncea). Other observed vegetation includes sand sagebrush (Artemisia filifolia), thistle (Cardus sp.), diffuse knapweed (Centaurea diffusa), cereal rye (Secale cereal), and shepard’s purse (Capsella bursa- pastoris). Wetlands An emergent wetland was identified in the central portion of the project area. The boundaries of the wetland are clearly defined by steep slopes that lead down to the waters of Amon Creek and the saturated and inundated soils of the wetland. Dominant vegetation in the wetland includes soft rush (Juncus effuses), hardstem bulrush ( Schoenoplectus acutus) cattail (Typha latifolia), and coyote willow (salix exigua). Positive indicators of wetland hydrology included saturation to the surface and areas of inundation. Positive indicators of wetland soils include low soil chroma colors and the presence of redoximorphic features. Wetland boundaries as mapped in the field are shown in Figure 4. 66192.000 Hayden Homes LLC Habitat Assessment January 24, 2019 Page 3 A previous wetland delineation that was completed as part of the Rachel Road Alignment study indicated that the wetland was rated as Category II wetland with a total score of 19 points (JUB 2017). This seems like the appropriate wetland category based on the observed conditions of the wetland and surrounding areas. That said, upon review of the rating form, it seems that the wetland should have a habitat rating score of 8 and not 7. This is based on the fact that the wetland does have aquatic bed vegetation in the form of cattail and hard stem bulrush within inundated areas. Therefore, question H1.1 of the wetland rating form would score 3 points. This would translate to a high rating for habitat site potential and a final wetland habitat score of 8 points. As per Table 22.10.110 (D) of the RMC, Category II wetlands with a habitat score of 8 or 9 have a buffer width of 100 feet for low intensity developments (Figure 4). Table 22.10.110 (C) lists utility corridors without a maintenance road and little to no vegetation management as a low intensity land use. Riparian Habitat Amon Creek (also known as Amon wasteway) flows north through the central portion of the project area (Figure 4). The creek meanders through a prominent depression. At the time of the site visit flow within the creek was barely observable and most of the surface water existed as smaller ponded areas. The lack of flow is likely due to a low rate of discharge, low slope, and dense vegetation. The ordinary high water mark of the stream was identified at the approximate toe of the slope in most areas as it appears that the stream likely overtops the banks of the observed channel during heavy precipitation events. Section 22.10.210 (J) RMC states: Width of riparian corridors shall be in accordance with buffer widths suggested by BAS, including WDFW publication Riparian Ecosystems, Volume 2: Management Recommendations, May 2018, or as revised. Amon Creek is fish or Type F stream.