7500 HARDESON RD 7 ELEVEN 2024-02-29

4.2 100-Year Flood Analysis The site is not mapped as a floodplain per the FEMA National Flood Hazard Layer FIRMette, effective September 16, 2005. Refer to Appendix A-6 for the FEMA Flood Map. 4.3 Adjacent Areas The site is bounded by 751h Street SW to the north, Hardeson Road to the east, an existing wetland to the southeast, the recently constructed Mtorres warehouse development to the south, an office building to the southwest, and a wetland directly to the west. 5.0 Critical Areas Several wetlands are located near the site. The wetland to the southeast was partially mitigated as part of the Mtorres development to the south, and it is separated from our site with a recently constructed grass -lined channel. There is another wetland located offsite to the west, and another wetland located to the northeast across Hardeson Road. There are no landslide or erosion hazard areas located onsite. The site is mapped outside of the area of potential seismic hazard. The liquefaction susceptibility of the site is mapped very low to low. There are no fish and wildlife habitat conservation areas within the site or immediately adjacent. Refer to Appendix A-5 for the Critical Areas Maps. 6.0 Soils South Sound Geotechnical Consulting prepared a geotechnical report for the site dated September 18, 2018. Five test pits were completed for the site ranging from 12 to 21 feet below the existing grade. A layer of fill was found in all of the test pits, which varies in depth across the site. The deepest layer of fill was on the eastern edge of the site, where the fill extended to a depth of 20.5 feet below existing grade. The north/central portion of the site had between 11 to 15 feet of fill, and the southwest portion of the site had between 1 to 3 feet of fill. A 1-foot layer of topsoil was found in the test pit near the south property line. The native soil found in all test pits consisted of silty sand with gravel and variable cobbles and clay. Most of the native soils were medium dense to dense and were interpreted as glacial till. Groundwater was only found in the test pit near the south central portion of the site at a depth of 17.5 feet below existing grade (elevation 483.5). Refer to Appendix E for the full Geotechnical Report. 7.0 Erosion and Sediment Control Minimum Requirements The purpose of this section is to describe how each of the 13 Erosion and Sediment Control Minimum Requirements has been addressed and to identify the type and location of BMPs used to satisfy the requirement. If a requirement is not applicable to the project, a reason is provided. Refer to Appendix A-4 for the Temporary Erosion and Sedimentation Control (TESC) Plan. 7.1 Preserve Vegetation/Mark Clearing Limits Prior to beginning land disturbing activities, clearing limits will be marked with flagging, high visibility plastic, or metal fence (BMP C103). The native soil and natural vegetation shall remain in an undisturbed state to the maximum extent feasible (BMP C101). Construction StPollution Prevention Plan 101000 Everett 7-Eleven Parking Expansion 3 2180309.11