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Gcotcchnical �nginec�ing Rcport <br /> Sirglc-Family Rcsidcncc <br /> � Lverett, Washington <br /> Deccmber 9, 20U� <br /> CG Filc t�o. 2017 <br /> � Pagc 9 <br /> � We recommend that cut slope� he protccted from erusion. :�teasures taken m�y inclade cocerine cut <br /> slopes with plastic shceting and diverting surface runoCf away from the top of cut slopes. We do not <br /> l recommend �•ertical slopes Yor r,uts deeper than 4 fect, if worker access is necessary. \Ve rccommend that <br /> "� cut slopc heights and inclinations conform to local and WISIIrU'r1SHA standards. <br /> 1 Final slopc inclinations for structural fill and the cuts in thc nativc soils should bc no stccper dian 21 i:l\%. <br /> Llghtly compactcd nlls or common fills shuuld bc no stceper than 3H:1 V. Common Glls arc detincd as <br /> � fill material with some organics that arc "trackrollcd" into place. "Ihey ��'ould not mect tL•e compaction <br /> d <br /> specification of swctural fill. Pin�l slopes should be ��cgetated and co�crcd �tiidi stra�v orjutc netting. <br /> � The vegetation should be maintaincd uniil it is est�blished. <br /> � 51ope Protection <br /> Protection of the setback and stecp slopc arcas should be performed as required. I[ should be understood <br /> � that the closcr the site disturbance and development are to the slope, the mom risl therc is of affcctine <br /> slope stability. Care should be taken to minimize disturbancc to the slope face. <br /> � Prom a geotechnical standpoint, selective prmiing and thinning of ��egetation should he acceptable. <br /> Cutting and pruning of trccs located on the slope can be ncrformcd, if allo�l�cd by the Ciry, but certain <br /> q precautions should he taken. Wc rccommend that the root bundle/stump of fallen hecs be 1cR in place. <br /> � Ynmed materials and debris should be removed from the arca and not allowed to remain on the slope. <br /> � Any disturbed arcas should be immcdiatel� rc-stabilized through vegetation planting or other approced <br /> � means. Soil, sod,clippings or other matter should not be placed on the slop�. <br /> I Of great importancc to the long-temi stabiliry oF the slope is the control of wrf.icc :md n�,�rvsurf�cc ��,atcr. <br /> and erosion protection. We recommend that all drains, including foundation, roof and yard drains, bc <br /> directed away from the top of slope and outf:ill at an arproved area. Surface drainage o�er the slope <br /> should not be permiucd. <br /> Foundntions <br /> General: Thc fowidations consisting of concentional tootings or drillcd picrs should e�tcnd to a deplh <br /> n�here a 25-Toot horizontal "effectiee sctback" is estaUlished. SVe expect this �vill be 10 to 1� feet below <br /> the existing ground surficc. <br /> ! <br /> i Cornerstone Geotechnical, Inc. !�; <br /> 9 ,��� <br />