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Limited Geotechnical Engineering Study <br /> View Ridge Elementary School Portable Classroom Installation <br /> Everett, Washington and Downspout Infiltration Feasibility <br /> • Import Aggregate: The free-draining backfill materials will need to be protected from <br /> siltation and sand by proper temporary erosion and sedimentation control (TESC) <br /> practices and management of the imported materials stockpile. Contaminated backfill <br /> materials cannot be used in the infiltration trenches and will be rejected by AESI. <br /> • Facility Protection: The infiltration system must remain off-line during construction to <br /> avoid siltation. Stormwater runoff must not be routed to the infiltration facility until the <br /> site is stabilized and runoff is clear.All construction site stormwater should be directed to <br /> a suitable location as specified on the approved TESC plan. <br /> • Construction Observation: AESI should be contacted at the time the infiltration facility is <br /> constructed to monitor the subgrade conditions encountered and compare them to the <br /> conditions observed during our explorations. <br /> • Due to natural variability of the subsurface conditions, the potential for field adjustments <br /> should be anticipated based on actual conditions encountered during construction. <br /> Depending on the season the infiltration facility is constructed, perched water may be <br /> present. The contractor should be prepared to handle the perched water. <br /> CLOSURE <br /> We are available to provide geotechnical engineering and monitoring services during <br /> construction if required. The integrity of the foundation system depends on proper site <br /> preparation and construction procedures. In addition, engineering decisions may have to be <br /> made in the field in the event that variations in subsurface conditions become apparent. <br /> July 12,2023 ASSOCIATED EARTH SCIENCES,INC. <br /> Bcr/Id-20100255E004-002 Page 10 <br />