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Subsurface Exploration, Geologic Hazard,and <br /> Snohomish County YMCA Geotechnical Engineering Report <br /> Everett, Washington Geologic Hazards and Mitigations <br /> should be collected as close as possible to the source to minimize silt entrainment that could <br /> require treatment or detention prior to discharge. Timely implementation of permanent <br /> drainage control measures should also be a part of the project plans, and will help reduce <br /> erosion and generation of silty surface water onsite. <br /> Once infiltration facilities are constructed, the contractor must provide temporary protection <br /> of the facility subgrade to keep the subgrade free of water and fine-grained sediments. <br /> Uncontrolled runoff into the infiltration facility constitutes failure of the subgrade, requiring <br /> removal of all backfill materials and contaminated subgrade, and replacement with clean <br /> backfill materials. The infiltration facility must be kept isolated from influent flows until after <br /> the site has been stabilized, so that only clean water is introduced into the infiltration facility. <br /> February 26,2018 ASSOCIATED EARTH SCIENCES,INC. <br /> AWR/ms-170671E001-2-Projects120170671‘KE\WP Page 9 <br />