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approximatcl�� 5 fecL I landauger refusal ���as encnuntered �u rclaii��cly �halh���� de;nhs due to <br /> increased soil dcnsit�� and Era��el aiment ��ithin the atl��ance out�cash. I:xpluration logs <br /> docutncnting ihc subsurfacc conditions cncuwllcrcd ���iUiin our hand-augcr cxplorations arc <br /> auached ���ith this letter. - <br /> \Vc reviewed gcologic data fur Ihc siic. b:iScJ on �he United Stalcs Gcoloeical Sur��cy (JSGS) <br /> Dlsrribrrtlon nnr! Des��ripliun o/ Geuln�,�rr Urri�s in !he Ereren �undrnngle, R'c�.cltington Uy <br /> Min.u'd, dated 1981. This map inJicates that the ncar-strcface sediment in the site vicinity <br /> consisls of aJ��ancc nut��:ish dcposits. Associatcd farth Scicnccs, Inc.'s (AL-SI's) geologic <br /> liudings arc in gcncral agrccmcnt �vith thosc uf thc USGS. <br /> Ground �eatcr was not cncoumcrcd in any of our cxploration borings. Graund watcr conditiuns <br /> should be expected to vary in response to changes in scasnn. amount uf precipiiation, on- ;in� <br /> off-sitc land usagc, and othcr factors. <br /> Sl.OI'1; IIA"J.�UiDS ANU RI'sC011n1I'sNDLD A11'1'IGr1TION <br /> fhc nc:u'-surl'acc, ad��ancc out���ash soils arc claciallp consolidatcd, mcdium dcnsc to ccry dcnse. <br /> :md not t���ic:dly pronc to landslidc mo��cmcnt in thc abscncc of giaund ���:dcr. 'Chcsc propertirs <br /> makr it resisiant to lan�sii�ine umler the iopographic conditions present at the si�e. <br /> According to thc li��erett �9miicip:d Code (L�iC) 'I'itle 19, Chapter 37. Section 37.090A1, in our <br /> urinion, lhc slupc along Ihe rast pruperll' hound,uy woul� hc classilicd as a ntcdium risk lan�slidc <br /> hazard duc to ihc inclination of�30 �icrccnt ur grc:ucr in thc height uf IS fcct. 't'hcsc slopcs �coul� <br /> alsu dassify as a high crosion hazard :ura per Section 37A90A3. <br /> 13ascd on our sitc visit, wc diJ not uhs�n�c i�bvious inJications of pasl or presc»I shallo��� or decp- <br /> seatcJ �lope movenunL Sile gencrated storm ���aler and fuoting Jr.iins should he tightlincJ to an <br /> appropriate sturm water com�cyancc system or tu the buttom of tlte siope. Provided the <br /> raunmicndaiions providcd in this Icucr and suund cunsuvction practiccs arc implcmentcd, in uur <br /> ��pinion, the ��roposrd Jevelopment ���ill nut ad��erscly iropact the stahility of thc adjacent slope. <br /> � c recummend tliat the garagc posts he anchorcd to a colunm iboting extending throueh thc <br /> -rsistin� till ar.d inti� n:edit:tn dense tu ��er}' d:nse ad�:ance out�e•�sh soils. i=urthennore. ��c <br /> rccoiumend that the footings tix tl'�c gar:ige be set back frum the top of the slope a dislance cyual <br /> �o thc hcicht uf thc slopc (cstimatcd to hc ,+hout 15 fcet) or, il the footings are placed dosrr ihan <br /> IS icct tu thc top of thc slopc, decpcnal suliicicntly so that a 21I:IV Q{orizuntal:Vcrtical) linc <br /> cxicndcd don�n�r'arJ from thc cdgcs of thc Ibo�incs ��'ill pa:s bclow thc loe of thc slopc. <br /> I'o miligatc and reduc� ihr crusinn h:v;inl and potential ti�r ol1-site scdimcnt transpnrt. ���c <br /> rcci�nmrenJ thc follo��'ing: <br /> I . Surfacc watcr shnulJ not hc allu�ccJ tu 110��' acros� thc sitc occr unprutcctc� sm'faccti. <br /> 2. :\II storm n�ater fiom impermcablc sm'faces, induding dri��c�v:p's and rools. shnuld hc <br /> ii�.!htlined �o a suitable tem��orary siorm �carer collection system or tighUineJ do���n the <br /> cnlire hcig,ht of Ihc stccp sli�pc, to an appropriate discharg� poini. <br /> � ���l <br />