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�<.,:, <br /> K <br /> � � ro <br /> � <br /> b 5 <br /> � y y P�;,Ott <br /> y � N Cronin Cusrom Homes <br /> � January 30, 1991 <br /> o m o Pa;`' 4 <br /> � M �+7 <br /> N H <br /> LC+1 O � <br /> o N ° standards be rework� at that r.me. The planneci residential structura should hava their ioundations <br /> � � � zxtend through the fill �o the undzrlyin; medium dense native soils. <br /> z H � <br /> � '" y STLEP SLOPE .1,\D L�:\�SLID� H�ZARD <br /> c °e �' The previous rzoorc da[ed 7uly 3l, 1990 sca[ed tha[ the on si[z s�opes a�e �onsidercd stsblz ��'i�h <br />� � y N rzspect ro dzep seated landslides. Some sloughing and erosion could exist, paruculady if the slenc <br /> H O V1 <br /> ve;eca[ion is disturbed during const:uction. I recommended th2� a 10 foot setback bz used enveea <br /> slopes in excess of 2:1 (horizontaLverical). Thz purpose ot this se:back is ro allow for mainterence oi <br /> �he base of the slope. In my opinion, �he s;ruc[ure could ba cu[ inro che slope wichoc� das�abi�izin; �he <br /> slopa, however, I still racommend dtzt a !0 fou[ �,vid� ba.^.cii 'oa cons[rucczd be:,�'�ar, the structura ar.ti <br /> the to�of the slope ro allo`�� fur fumre m�incanenc�. <br /> S�IS�IIC HAZ:�RD <br /> The Pu;at Sound re;ion is classitied as a zone 3 by the i;niform Buildin�, Code. Hazards <br /> i!�` �ssocia[ed wi[h seismicity ir.duda liquefac[ion, ,ound movement �[tenua[ion and rzduccion of slope <br /> �.s..° srbiliry. LiquzPaction is �aused by = rise .n pora pressurzs in a loose sand dzposic. The potential is <br /> 1 based on cha dznsiy of ch� sand, and : �:�a:e< <ab�z mus� =c�5� `°���n the sand and tha thic.l•ness ot the <br /> �... deposit. �fy opinion, is thz[ tha sard Pound bzlo�v [he :ill is dzrsa enou;h ro have a !ow risk ot <br /> �' liqueiac[ion. <br /> Ground attenu��ions are associated wi[n soit soil deposits [ha: tend have a sziche type respo�se <br /> �, �� to szsmic avens. These c;:pes oP soiis �azr not ;ound in [ha da�,e(opmenc area. <br /> Tha dense dritt ar.d til( found in the slope ro the wzst has a hi_�n tactor of satzry witn rzsoect to <br /> pm) � ;ar.dslides. The sais:nic avea[ �,coulci no[ si;niticandy lowzr [his facror or safa[y. <br /> � L'ROSIO`7 <br /> �,� . <br /> The onsi[e soils nave modera�a �o hi;h zrosion po�enral �a'hen disturbeci and e�pos�d on slo�es. <br /> P.11 dis[urozci or non-va;etated slopes should be compacted :md va;e�ated to rzduce erosion. The us� <br /> ��i� oT a coverir.g ot hay m�y ba raa:iired to r:diix ;ha erosion uncil cha �zgzcacion is eseablished. It e <br /> w <br /> slop�s have not been veg�tated and heaw r�ins are an[icinared, diey should be covered �vrth plastic ro <br /> recluce tha erosion h;:zard. Tha va�e:a[ion s ould be main[ained �nd re,aired uncil i[ is estaolished. <br /> The arzss of concern tor ;his si[z are ;ha s[�ep hillsida :o the uesc and the existing :ill slope <br /> COtiVi2LTTE G�OTGCEL`7IC.1L L\GI\TL•RL`�G <br />