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CRITICAL AREAS REVIEW TECHNICAL REPORT_Crystal Springs Road Short Plat_2023-0308Critical Areas Report Dolgovyazov Duplex Project 1 LAND SERVICES NORTHWEST 120 STATE AVE NE PMB 190 OLYMPIA, WA 98501 360-481-4208 3/8/2023 RE: CRITICIAL AREA REVIEW FOR PARCEL# 22719220113 INTRODUCTION This letter is the result of a critical area review conducted on January 31, 2023, at the 1.07 acre parcel # 22719220113 at 1001 Crystal Springs Road NW, Yelm, WA 98597 with the legal description of L Section 19 Township 17 Range 2E Quarter NW NW Testamentary Division LT 8 Document 4028308 located in Thurston County, Washington (Figure 1). Critical Areas Report Dolgovyazov Duplex Project 2 SITE CONDITIONS The site was visited on January 31, 2023. The day was relatively clear with light precipitation occurring in the week before. The temperature was about 42 degrees and the ground was bare, however the ground itself was not frozen. CURRENT CONDITIONS Parcel #22719220113 is a relatively flat parcel maintained as a grassy field with invasive scotch broom (Cytisus scoparius) that is bounded single family residences to the south and vacant parcel to the west, Crystal Springs Road to the east and a storage yard to the east . There is a slight grade to the west although most of the site is very flat (Figure 2). Critical Areas Report Dolgovyazov Duplex Project 3 EXISTING INFORMATION REVIEW In order to get a better understanding of the properties and their position of the landscape, the following information was reviewed: National Wetlands Inventory (NWI) Map (Appendix B) The US Fish and Wildlife Service wetland shapefile data does not show any wetlands within 300 feet of the property. Yelm Creek is approximately 500 feet to the west. Thurston County Area Soil Survey, Soil Conservation Service (U.S. Department of Agriculture, 1973) National Resource Conservation Service Shapefiles (NRCS Web Soil Survey, 2022) (Appendix C) The NRCS Soil Survey shows the property as containing: • Spanaway gravelly sandy loam 0-3% • Spanaway gravelly sandy loam 3-15% The Spanaway series consists of very deep, somewhat excessively drained soils that formed in glacial outwash. They are on terraces and plains. Slopes are 0 to 15 percent. The mean annual precipitation is about 1,270 millimeters. The mean annual temperature is about 10 degrees C. TAXONOMIC CLASS: Sandy-skeletal, isotic, mesic Typic Humixerepts TYPICAL PEDON: Spanaway gravelly sandy loam - fern-grass prairie. (Colors are for moist soil unless otherwise stated.) Oa--0 to 3 centimeters; black (10YR 2/1) highly decomposed plant material, very dark brown (10YR 2/2) dry; mostly from grass roots and moss. (0 to 4 centimeters thick) A--3 to 38 centimeters; black (10YR 2/1) gravelly sandy loam, very dark grayish brown (10YR 3/2) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many fine roots; very high in organic matter content, has mellow, sooty feel; 34 percent gravel; strongly acid (pH 5.4); clear smooth boundary. (25 to 50 centimeters thick) Bw--38 to 48 centimeters; dark grayish brown (10YR 4/2) very gravelly sandy loam, grayish brown (10YR 5/2) dry; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine roots; 45 percent gravel, 10 percent cobbles; moderately acid (pH 5.8); clear smooth boundary. (8 to 20 centimeters thick) RANGE IN CHARACTERISTICS: Solum thickness is 35 to 70 centimeters. The mean annual soil temperature is 9 to 12 degrees C. These soils are usually moist but are dry in the moisture control section for 75 to 90 consecutive days following summer solstice. The umbric epipedon is 25 to 50 centimeters thick. Rock fragments are 35 to 85 percent, with 35 to 60 percent gravel, 0 to 60 percent Critical Areas Report Dolgovyazov Duplex Project 4 cobbles and 0 to 5 percent stones The A horizon has hue of 10YR through 5YR, value of 2 to 4 dry, and chroma of 1 or 2 moist and dry. It has weak granular or blocky structure and is moderately acid or strongly acid. The Bw horizon has value of 4 or 5 dry and 3 or 4 moist. It is very gravelly sandy loam, very gravelly loam or extremely gravelly sandy loam. It has weak fine or medium blocky structure and is strongly acid to slightly acid. GEOGRAPHIC SETTING: Spanaway soils are on glacial outwash terraces and plains at elevations of about 30 to 150 meters. Slopes are 0 to 15 percent. These soils formed in glacial outwash. These soils are in a maritime climate with cool, dry summers and mild, wet winters. The mean annual precipitation is 890 to 1650 millimeters. The mean annual temperature is about 10.5 degrees C. The frost-free season is 150 to 200 days DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat excessively drained; slow runoff; high saturated hydraulic conductivity. Thurston County Geodata Wetland, Stream and Waterbody Inventory (Appendix D) Thurston County maintains a geodatabase of wetland stream and waterbody features. These shapefiles did not show any wetlands streams or waterbodies within 315 feet of the subject properties. USGS 7.5 Minute Quadrangle Topographic Maps (Appendix E) The USGS maintains topographic maps which show natural and man-made features. This map does not show any hydrologic features within 300 feet of the subject properties. Yelm Creek lies beyond this distance. to the west. Washington Department of Natural Resources Stream Type Map (Appendix F) The WA Dept of Natural Resources has a map that shows stream types in accordance with the WAC 222- 16-31. This map does not show any streams or wetlands within 300 feet of the subject property. Washington Department of Fish and Wildlife Priority Habitats and Species Database (Appendix G). The Washington Department of Fish and Wildlife Priority Habitats and Species Mapper shows the Townsend's Big-eared Bat and Yuma myotis. These are general polygons. The bats may feed on macroinvertabrates in the area, or rest in the attics of the garage or the single-family homes, however no guano or other signs of bats were found on the site during the visits. Critical Areas Report Dolgovyazov Duplex Project 5 These are general inventories of information gathered by remote sensing and a site visit was necessary to verify the information. RECONNAISSANCE METHODS Land Services Northwest personnel surveyed the property on January 31, 2023, looking at plant communities, slopes, drainage patterns while paying special attention to swales and low spots where water might collect. We had previously conducted a Mazama pocket gopher study during the 2022 season, so we were somewhat familiar with this property Land Services Northwest based its wetland evaluation on the routine on-site determination method published in the 1987 Wetland Identification and Delineation Manual (Environmental Laboratory, 1987) and the Western Mountains Valleys and Coast Region (Version 2.0) (USACE, 2010). The Wetland- adapted plant species (hydrophytes) were evaluated as indicators of soil saturation and inundation. Soils were excavated to 18 – 24 inches below the surface within representative test pits to evaluate soil characteristics and hydrological conditions. The subject areas were evaluated for wetland hydrology, including pooling, ponding, and soil saturation. Hydrological conditions were observed through surface or soil indicators. Wetlands were rated using the current version of the Wetland Rating System for Western Washington (Hruby, 2014). No water or signs of water were found on site. Streams were classified using WAC 222-12-32 Forest Practices and Yelm Municipal Code. FINDINGS No wetlands or other suspicious areas which warranted further exploration were found onsite No streams were found on site with a bed and bank or sorted gravels signs of water flow. No Floodways are found onsite or within 300 feet of the site. Yelm Creek is located offsite beyond the 315 foot study limits and did not warrant further study. No other suspicious areas were found in the vicinity of the subject property; however, we were limited to what we could see from the property line, and aerials as we did not have permission to visit the adjacent properties. PROPOSED PROJECT The project is to build three duplexes with a road, driveways and associated infrastructure “Proposed development of the site will consist of 3 duplexes with associated roadways, utilities, stormwater management, and open space. Stormwater management and runoff treatment for the site are proposed to be addressed through the implementation of a bioretention facility in the northwestern portion of the site. The subject properties drainage facilities were designed using the guidelines and requirements established in the 2019 DOE Stormwater Management Manual for Western Washington (2019 SWMMWW) as indicated by the City of Yelm Municipal Code. The project is located within a critical aquifer recharge area. In order to protect groundwater from pollution during construction, pollutants will be handles with care and disposed of through approved methods only per the requirements of the 2019 SWMMMWW. Maintenance, fueling, and/or repair of Critical Areas Report Dolgovyazov Duplex Project 6 heavy equipment and vehicles is not anticipated to occur on site. Bulk cement and new concrete washing or curing waters are anticipated to be present on site as pH-modifying sources. In order to protect groundwater from these pollutants, BMP C252 (Treating and Disposing of High pH Water) of the 2019 SWMMWW will be implemented to ensure no discharge to groundwater. Additionally, concrete trucks will not be washed out onto the grounds, or into storm drains, open ditches, streets, or streams. Excess concrete must not be dumped on-site, except in the designated concrete washout areas with appropriate BMPs installed. In order to protect onsite soils from siltation, a lined temporary sediment pond will be located upstream of the bioretention facility to allow for sediment to settle out of the construction runoff prior to discharge. Insert Site Plan Figure 3 CRYSTAL SPRINGS ST NWSEC. 19, T17N., R02W., W.M.JOB NO:DRAWING FILE NO:DATE:DESIGNER:BYDATEREVISIONSDRAWN BY:SHEET TITLE:OFDRAWING NO:SHEET NO:PROJECT NAME:SEAL:APPROVED BY:CRYSTAL SPRINGS STREET NWYELM, WA 98597ZNGMARCH, 202322-0009771CRYSTAL SPRINGS ROAD SHORT PLAT8730 TALLON LANE NE, SUITE 200, LACEY, WA 98516P: 360.352.1465SCJALLIANCE.COMZNGSITE PLAN EXHIBITSETBACK NOTES: Critical Areas Report Dolgovyazov Duplex Project 7 REGULATORY REVIEW The City of Yelm is in an Aquifer Recharge area covered by YMC 18.21.070 Critical aquifer recharge areas which is covered with comments referring to the proposed development below (Comment in Italics). A. Critical Aquifer Recharge Areas Designation. Critical aquifer recharge areas are those areas with a critical recharging effect on aquifers used for potable water as defined by WAC 365-190- 030(2). A critical aquifer recharge area has prevailing geologic conditions associated with infiltration rates that create a high potential for contamination of ground water resources or contribute significantly to the replenishment of ground water. Noted. B. Designation of Critical Aquifer Recharge Areas. The entire city of Yelm and its urban growth area is identified as a highly susceptible critical aquifer recharge area. Noted. C. Performance Standards – General Requirements.. 1. Activities may only be permitted in a critical aquifer recharge area if the applicant can show that the proposed activity will not cause contaminants to enter the aquifer and that the proposed activity will not adversely affect the recharging of the aquifer. The activities that will be permitted in this area would be consistent with typical residential activities. No commercial activity is planned or expected to be associated with the residences except for typical home based office activity business that are common these days. No automotive repair businesses or businesses that use commercial cleaning chemicals will be used and disposal of wastes generated by the single or multifamily residences will use typical waste collection services. The construction of the site will use construction bmp’s such as silt fences, straw wattles and other stormwater BMP’s to prevent discharge of turbid waters to waters of the state using the most recent accepted City of Yelm Stormwater Manual. 2. The proposed activity must comply with the water source protection requirements and recommendations of the U.S. Environmental Protection Agency, Washington State Department of Health, and the Thurston County environmental health division. All activites that are proposed will be compliant with the water source protection requirements and the recommendations of the US Environmental Protection Agency, Washington State Department of Health and the Thurston County Environmental Health Division. Critical Areas Report Dolgovyazov Duplex Project 8 3. All new development, redevelopment, and small parcel development shall meet the water quality requirements of the stormwater manual as adopted by the city of Yelm. A Stormwater Pollution Prevention Plan will be developed that will be consistent with the most recently adopted stormwater water quality manual adopted by the City of Yelm. A memo is attached outlining many of those features. D. Performance Standards – Specific Uses. 1. Storage Tanks. All storage tanks proposed to be located in a critical aquifer recharge area must comply with local building code requirements and must conform to the following requirements: a. Underground Tanks. All new underground storage facilities proposed for use in the storage of hazardous substances or hazardous wastes shall be designed and constructed so as to: i. Prevent releases due to corrosion or structural failure for the operational life of the tank; ii. Be protected against corrosion, constructed of noncorrosive material, steel clad with a noncorrosive material, or designed to include a secondary containment system to prevent the release or threatened release of any stored substances; and iii. Use material in the construction or lining of the tank that is compatible with the substance to be stored. No underground tanks will be installed for use in the storage of hazardous substances or hazardous wastes. No generators of toxic or hazardous wastes are expected as the applicant proposes single family residences or multifamily residences which do not create hazardous wastes that would need to be stored in tanks. b. Aboveground Tanks. All new aboveground storage facilities proposed for use in the storage of hazardous substances or hazardous wastes shall be designed and constructed so as to: i. Not allow the release of a hazardous substance to the ground, ground waters, or surface waters; Hazardous substances will be disposed of in an environmentally responsible manner and would not allow the release of a hazardous substance to the ground, ground waters, or surface waters; Critical Areas Report Dolgovyazov Duplex Project 9 ii. Have a primary containment area enclosing or underlying the tank or part thereof; and It is not expected that any of this would be needed. No containment area would be required as no hazardous wastes will be generated beyond the small amounts that could be associated with a single-family residence iii. A secondary containment system either built into the tank structure or a dike system built outside the tank for all tanks. No above ground tanks will be installed on site to hold or release any hazardous substance to the ground, ground waters, or surface waters; 2. Vehicle Repair and Servicing. a. Vehicle repair and servicing must be conducted over impermeable pads and within a covered structure capable of withstanding normally expected weather conditions. Chemicals used in the process of vehicle repair and servicing must be stored in a manner that protects them from weather and provides containment should leaks occur. It is not expected that vehicle repair or servicing would be done at any of the newly created residences as it is not a typical residential activity, b. No dry wells shall be allowed in critical aquifer recharge areas on sites used for vehicle repair and servicing. Dry wells existing on the site prior to facility establishment must be abandoned using techniques approved by the state Department of Ecology prior to commencement of the proposed activity. No Vehicle repair or servicing will be conducted onsite. No dry wells for vehicle repair or servicing will be required for these activities. No known dry wells are onsite. If any are found they will be abandoned using techniques approved by the WA State Department of Ecology 3. Use of Reclaimed Water for Surface Percolation or Direct Recharge. Water reuse projects for reclaimed water must be in accordance with the adopted water or sewer comprehensive plans that have been approved by the State Departments of Ecology and Health. a. Use of reclaimed water for surface percolation must meet the ground water recharge criteria given in RCW 90.46.010(10) and 90.46.080(1). The State Department Critical Areas Report Dolgovyazov Duplex Project 10 of Ecology may establish additional discharge limits in accordance with RCW 90.46.080(2). No reclaim water for surface percolation will be done or generated onsite. b. Direct injection must be in accordance with the standards developed by authority of RCW 90.46.042. (Ord. 995 § 12 (Exh. A), 2015). No direct injection will be conducted on site. If for some reason direct injection would be necessary, it would be done in accordance with the standards developed by authority of RCW 90.46.042. CONCLUSION The subject properties were reviewed using the onsite determination method for wetlands looking for hydrologic features or signs of wetlands. No wetlands, streams, floodways, steep slopes, or other critical areas were found during the literature review or onsite survey. The area lies in a Critical Aquafer Recharge area. BMP’s and project design will maintain water quality and no discharges of untreated water to waters of the state are expected. LIMITATIONS This report was created with care and best professional judgment using the current best available science, but the report is subject to interpretation by local state and federal regulators who have the final regulatory authority on critical areas and their boundaries. No recommendations or suggestions should be undertaken without regulatory approval of this report. Critical Areas Report Dolgovyazov Duplex Project 11 Appendix A – PHOTOGRAPHS Critical Areas Report Dolgovyazov Duplex Project 12 Critical Areas Report Dolgovyazov Duplex Project 13 Critical Areas Report Dolgovyazov Duplex Project 14 Critical Areas Report Dolgovyazov Duplex Project 15 Critical Areas Report Dolgovyazov Duplex Project 16 Appendix B – USFWS NATIONAL WETLAND INVENTORY Critical Areas Report Dolgovyazov Duplex Project 17 APPENDIX C – NRCS SOIL SURVEY FOR THURSTON COUNTY Critical Areas Report Dolgovyazov Duplex Project 18 Critical Areas Report Dolgovyazov Duplex Project 19 APPENDIX D – THURSTON COUNTY WETLAND, STREAM AND WATERBODY SHAPEFILES Critical Areas Report Dolgovyazov Duplex Project 20 APPENDIX E – USGS TOPOGRAPHIC MAP Critical Areas Report Dolgovyazov Duplex Project 21 APPENDIX F – WADNR FOREST PRACTICES STREAM TYPE MAP Critical Areas Report Dolgovyazov Duplex Project 22 APPENDIX G – WASHINGTON DEPARTMENT OF FISH AND WILDLIFE PRIORITY HABITATS AND SPECIES MAP Critical Areas Report Dolgovyazov Duplex Project 23 Critical Areas Report Dolgovyazov Duplex Project 24 Critical Areas Report Dolgovyazov Duplex Project 25 Critical Areas Report Dolgovyazov Duplex Project 26 Appendix H – Thurston County FEMA Floodway Map Critical Areas Report Dolgovyazov Duplex Project 27 Appendix I – SCJ Ground and Surface Water Protection Memo MEMORANDUM Date: March 23, 2023 To: Alex Callendar, Land Services NW From: Bill Dunning, PE Re: Crystal Springs Road Plat Stormwater Management Water Quality Project #22-000977 The Dolgovyasov Short Subdivision project is located at 1001 Crystal Springs Road SE in Yelm, Washington on a single parcel. The total project site area is 46,609.2 square feet (1.07 acres). Residential properties are to the south with a storage yard to the north and a vacant lot to the west and Crystal Springs Road SE to the East. Proposed development of the site will consist of three duplex buildings on three separate parcels with associated roadway, utility, stormwater management, and open space improvements as required by code. Stormwater management and runoff treatment for the site are proposed to be addressed through the implementation of a vegetated filter strip for water quality and an underground infiltration facility located in the back yard of each duplex building. The subject property's drainage facilities were designed using the guidelines and requirements established in the 2019 DOE Stormwater Management Manual for Western Washington (2019 SWMMWW) as indicated by the City of Yelm Municipal Code. The project is located within a critical aquifer recharge area. In order to protect groundwater from pollution during construction, pollutants will be managed with care and disposed of through approved methods only per the requirements of the 2019 SWMMMWW. Maintenance, fueling, and/or repair of heavy equipment and vehicles is not anticipated to occur on site. Bulk cement and new concrete washing or curing waters are anticipated to be present on site as pH-modifying sources. In order to protect groundwater from these pollutants, BMP C252 (Treating and Disposing of High pH Water) of the 2019 SWMMWW will be implemented to ensure no discharge to groundwater. Additionally, concrete trucks will not be washed out onto the ground, or into storm drains, open ditches, streets, or streams. Excess concrete must not be dumped on-site, except in the designated concrete washout areas with appropriate BMPs installed. In order to protect onsite soils from siltation, a lined temporary sediment pond will be located upstream of the bioretention facility to allow for sediment to settle out of the construction runoff prior to discharge. Add any other considerations such as primary use expected and how that will not discharge to waters of the state (Groundwater).