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Augic t 18. 2004 <br />h1r. Jini �Chomas <br />l)clvcd�_rc L�ris J2 and 33 <br />I,SA J��h N��. 4nU88 <br />Pagc 7 <br />CfOLOGI�' IIA7ARUS ' <br />I,:u�Jslidc IL�rirJs <br />l�hc ridge shclf aud Ihc stcep slapc (lanking it to the east arc fi�rmed with vcry dcnse Bsperancc <br />SanJ of finc lo coarsc sand at shallow dcpths. Thcsc soils arc of modcralcly high !o vcry high <br />shear slrength. "fherefore, the risk for c!cep-seated slopC ���ilures cuttiug into the very dense <br />f-.sperancc Sand deposits underling thc lots at rela(;��ely shallow dcpths should bc minimal. The <br />surficial wcaker soils mantling the stecp slope ma� slough off in the form of shallow, skimtypc, <br />mud(lows when overiy saturated. To allcviate such ha7ard, thc dense vegelation covcr over thc <br />sicep slopc should not bc dislurbcd. Stonnwatcr ovcr impervious� Sl1fGICCS. SUCII as roofs and <br />Jrivcways, should bc capturcd and draincd into a suitablc slcrmwater disposal facilily, such as <br />tlic cxisting stonn sewer undcr the streel. Concentra(ed stonmvater should not be discharged <br />onlu thc slccp slu�ic. <br />P;rusion Ilar.ard <br />Ihe surficial weaker soils manlling the steep slope can be easily eroded. 'Io abate the erosion <br />po�cnlial of thc slope, Ihe vegetatiun on thc slope shoidJ not be dislurbcd and disturbed, unpaved <br />gruund within lhe lols should bc re-vegelatcd. Concentrated slorm�valer sliould not be released <br />o��to thc grouncl within !hc sitc, including thc stc��p slopc withi❑ thc lo�s. Slorm runoff over <br />impervious surlaccs, such as raofs and drivcways should bc collcctcd with undcrground drain <br />linc systcros or catch basins, and tighUincd to discharged inlo a slorm scwcr or a suilablc <br />srornnvaler disnusal fi�rility. S�+oil soils and yardwastc should nut be disposed of onio the stecp <br />slupc. <br />Scismic Il:v.ard <br />l he Puget Sound regiun is classilicJ as Seismic "/_one 3 by the Uniform [3uilding Code (U'BC). <br />P,ccurJing to i hc densc �o vcry-dcns� lisperance Sand deposits undcrlying tlie sitc at relativeiy <br />LIU St ASSOCIATCS, INC. <br />