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E-2554 <br /> :verelt Land Association page 6 <br /> Fzbruary 27 , 1985 <br /> .ri <br /> F:xcavations hnd Slopes ' <br /> I 1 In no case shnuld a�cavation sloper, be greac�r than ttie limits <br /> specified in local, state and national yoverninen� safaty regula- <br /> i tions. Temporary cu�s greater than ti�ur ;.eeC in heighr should <br /> j have an inclination no Steepar than . 5 : 1 (I{�rizontal :Vertical ) in <br /> G glacially consolidated soils anc9 1 : 1 ( H:V) in other soils . <br /> 3 <br /> b Yermanent cut slopes in ylacially consc�lidated soils should be <br /> r inclined no steeper than 1 . 5: 1 (Ff:V) . Oth�r permanent cut and <br /> � fill slopes should be inclinetl no steeper than 2: 1 (N:V) . These <br /> recommendations are ap[�licable to slopes with a maximwn height of <br /> ten feet. We also recommend that all excavatetl slopes be examinecl <br /> by tarth Consultanls, Inc. to verity tnat conditions are as <br /> ancicipate�. supplementary r.ecommendations can then b� developed, <br /> if needed, to improve stability , includiny tlattenin � of slopes or <br /> installation of. surface or subs�r[acr drains. In a.iy case, water <br /> =hould not be allowed to flow unconCrol.led over t1e to}� of any <br /> slopes. <br /> All permanently exposed slo�es should be seeded with an <br /> appropriate species of vegetation to reduce erosion and improve <br /> stability of the surficial layer of soil. <br /> Site D_ r�e <br /> Groundwater wa^ encountered in our test pits aC depths ranging <br /> from zero to iive feet. However., it has been our experience that <br /> yroundwater lev�ls change significantly due to changes in rainfali <br /> amounts, surEace drainage or other factors. If seepage is <br /> � ,� �ountered in the excavation, the water should be drained away <br /> ;iom the site by use of drainage ditches, perforate�7 pipe or <br /> French drains, or by pumning from sump= inter.connected by sliallow <br /> connector trenches at the bottom of the excavation. , <br /> We suggest that appropriate locations of subsurface drains, if <br /> naeded, be established duriny grading o��erations by a represen- <br /> tative of Earth Consultants, Inc. , at which time the seepage <br /> areas, if present, may be more clearl/ defined. <br /> The excavati.on and site should be graded so that surface water <br /> is directed oEE the site and away from the tops of slo�es. WaL�- <br /> should _�t�e allowed to stand in any a Du�Rher�onstruction, 51 ose <br /> or .pavements.. are to_ be . constructed.._..__ __�' <br /> surfac�s should be sealed at night by compactiny the surYace soils <br /> to reduce the infiltration of rain into the soils. Final site <br /> grades should zllow for drainag� away from the building founda- <br /> tions. We sugyest that the ground tx sloped 3 percent for a <br />�' distance of at least ten feet away from the buildings except in <br /> areas that are to be paved. <br /> Eahh Consultants, Inc <br />