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Reporr <br /> ' Cronin Cusrom Homes <br /> lanuary 30, 1991 <br /> Pa;e i <br /> standards be reworkrsl at ihat [im:. The plann� ruiden[ial st:ucturu should have chei: ioundz[ions <br /> zxtend threv;h the fitl m the underlyin�medium dense naeive sails. <br /> SfL•EP SLOPE.�,\�L�IWSLIDE HAZARD <br /> T'he previous report dat�luly 31, 1990 st�ted tha[ihe on site slopes arz wnsidered stable with <br /> respec[ m deep seated landslidu. Some sloughing and erosion could exist, par[iculady if the slnpe <br /> ve;e[ation is disturbul during constmccion. I recommended tha[ a 10 ioa[ setback be useA betwzen <br /> slopes in excess ot 2:1 (horizontal:verticaq. Thz purpose of!his seeback is m allow ior maintenznce of <br /> the base of the stope. In my opinion, the s:ructuro could be cu[ into the slope withou[drseabilizing�he <br /> �:opa, however, I stitl recommznd ;hxc a 10 ioot widz bznch ba mns[mc[zd banveen tha sttucmra and <br /> the toe o[the slope ta allow ror future m�inr:r.ence. <br /> SHIS\IIC HAZ�IRD <br /> The Pu;tt Sounu ragion is classined as a zone 3 by the Uniiorm 6uildin;; Coda. Hazards <br /> :ssociat� «'im seismiciry ir,c!ede liquchction, ;raund movement attenuation and reduction of slope <br /> stzbiliry. Liqueiaction is cacsed by s rise in pora pressures in a loose sand deposi[. The po[tnei�l is <br /> based on the density of!he sand, and a water c�61e m,ust exisc wiehin the sand and the thic}:n.ss or ehe <br /> dzposit. �1y opinion, is thc: !he s.nd found helow ;he till is der.se enau;h co have a !ow risk oi <br /> liquciaccion. <br /> Ground ar,enu�cions a:a associa[zd wieh ,oit so:l depo:�Yes tha[ tend have a sziche :ypa :csponse <br /> :o szismic zv:na. Th:sz[ypes cr soils wtrt nut�ound in thz dtvelopmen[ama. <br /> The dense driic znd ;ill t�und in tho slone te eie •.cest hs a hi=h tacror o(saizty �vi;n czsp:c[to <br /> ;andslidas. T.�z s�ismic zvan:wou!d no[sig�ificar.;y lo�•var chis fac:or of safz;y. <br /> EROSION <br /> The onsice soils havz mcd¢ratc ro high z:osion potzntial when dismrcrA �nd esposed on slopes. <br /> All dismrbed or non-va�etatul siopzs should be �ompa.red and ve;e;sted to reduce zmsion. The use <br /> ot a covering ot hsy may ba :tquircd to rcduco tha e:osion uatif the vagztation is zstablished. It ehe <br /> slopes have not been vegetated ar.d heaw rxins are anticipa:ed, they should be covered with plutic ro . <br /> reduca the erosion hazard. 7'he va�:cation should be maintained znd repaired un[il it is est�blished. �. <br /> The areas ot concem (or this site are the seezp hillside to ehe west and �he existina fiil slape <br /> COUVRETTE GEOTECfL�ICdL EYCLYEER4YG <br />