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August 27 , 1980 <br /> Project No. 4080 <br /> Page three <br /> Proposed Conditions <br /> Development is anticipated to consist of a single family residence. <br /> Placement of the structure is to be into the slope, to achieve <br /> a relatively level condition. This will require excavation into <br /> the upslope portion, and extention of foundations along the slope <br /> face. A swimming pooi is px•oposed, as well as outboard decks . <br /> Conclusions and Recommendations <br /> Based upon the conditions encountered and proposed development <br /> as anticipated, we believe that residence construction as proposed <br /> should be adequately stable , so long as recommendations as pre- <br /> sented herein are utilized for development. <br /> Initially, we suggest that foundations be placed into the basal <br /> soils a minimum of three feet to achieve maximum allowable soil <br /> pressure of 1500 psf. Within +.he upslope excavation area, this <br /> penetration will have been achieved; however, within the downslope <br /> area, additional excavation may be required. Where excavations <br /> are les� than three feet into the natural basal soils , overexcava- <br /> tion to achieve the depth should be performed. This can be per- <br /> formed through trenching or piers , denending upon finish grade <br /> elevation. A minimum of 18 �.nches for conventior.al foundations <br /> within the excavated upslope portion, should be expected for <br /> footing depthi whereas , the downsl.ope footings will probably be <br /> much dee�er depending upon finish grade elevation. <br /> The upslope excavation will require adequate retainage to maintain <br /> existing stability. This is understood to consist of a foundation/ <br /> retaining wall system, where the upslope structural walls are to <br /> act as retaining walls . We believe this system to be adequate <br /> for slope staY,ility, using the maximum allowable soil pressure and <br /> an equivalent fluid pressure of 45 Pcf. <br /> Adequate drainage should be anticipated, consisting of foundation <br /> znd roof drains , independantly directed away from the building <br /> area. The upslope retaining wall areas should u�ilize a basal <br /> drain system, connected to w washed aggregate backfill behind the <br />