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Oskar Property Deck Limited CAO,Everett,WA Materials Testing&Consulting,Inc. <br /> July 17,2019 1913182 <br /> Additional resistance to lateral loads may be calculated by multiplying vertical dead load on the base of <br /> the footing by sliding resistance. For foundations placed as recommended directly over dense or hard <br /> native glacial till or advance outwash subgrade, or on properly compacted imported structural fill used to <br /> level foundation grades, we recommend a friction coefficient of 0.35 be applied. <br /> For structural backfills against foundations and for restoration of local overexcavations, if required, we <br /> recommend backfilling in horizontal lifts with compacted structural fill. Activities should be restricted to <br /> within the constrained development footprint on the upland portion of the site. Fills should not be placed <br /> above or on any portions of the critical area slope. Structural fills should be installed in 8- to 10-inch <br /> maximum loose lifts and compacted to a dense and unyielding condition to at minimum 95%of optimum <br /> dry density based on results of modified laboratory proctor per ASTM D1557. Lesser lifts should be <br /> used as needed to achieve compaction with smaller hand-operated or walk-behind equipment. For <br /> general use, we recommend imported structural fill conform to "Gravel Borrow" per WSDOT Standard <br /> Specification 9-03.14(1), or appropriate equal substitution. <br /> MTC recommends that we be contacted to review foundation plans and specifications once available, to <br /> ensure they are consistent with the intent of the recommendations provided herein. MTC may be <br /> contacted to consult on foundation placement options and review or provide additional recommendations <br /> for proposed construction specifications. In addition, MTC recommends that we be retained for <br /> construction phase testing, observation, and engineering consultation services if needed. Such services <br /> may include but are not limited to earthwork support consulting, subgrade verification, compaction <br /> testing of structural fills, laboratory materials analysis, and special inspections if required. If conditions <br /> differ from those interpreted herein, MTC recommends that we be contacted to provide supplemental <br /> recommendations for site and foundation construction. We recommend that a qualified MTC soils <br /> engineering representative be present during foundation preparations, to observe and verify subgrade <br /> suitability and to confirm adherence to recommended site preparations. <br /> Erosion Controls and Vegetation Enhancement <br /> Properly implementing erosion control measures and practices during site preparations is necessary to <br /> limit the effects of construction on the critical area slope and crest areas. Standard recommendations for <br /> construction-phase erosion control are presented below. In addition,the slopeward clearing limit barriers <br /> must be adequately established and maintained. It is the responsibility of the contractor to ensure suitable <br /> protective measures are in place as needed throughout the project. Stockpiling of excavated tailings is <br /> also prohibited near the slope face. Tailings should be removed directly from the uphill side of the <br /> project site and only stored in small amounts for reuse or transport within the upland gently sloping part <br /> of the property at the improvement location. Finally, earthwork disturbance of grounds and existing <br /> 8 c:)(1 <br />