Laserfiche WebLink
H O H <br />A�]C <br />�Ht~u <br />H�H <br />�H7�d <br />oxo <br />'� N 'i1 <br />NN <br />x <br />��d <br />oH <br />�/��g <br />y�Y � <br />t"y� <br />HH <br />g�' <br />H <br />c� C7 [� <br />Q � <br />o� <br />� <br />1 <br />I �� <br />� <br />I � <br />' '� <br />„ <br />DAVID L NflL50N AND ASSOCIATES,INC. <br />Consulung Enginccring Gculogy <br />Febcuary 8, 1990 <br />P=oject No. 0890 <br />Page 3 <br />g=avelly silty sand, vith logs, ioots and some debris. <br />HYDROLOGIC CONDITIONS <br />Gcound vater vas encountezed vithin most of the test pits peifotmed on site. <br />We found qzound vatez to occuc vlthln the basal advance qlacial outva=h <br />deposits, genecally at about 9.5 to 10 feet belov gcade vithln the midslope <br />and upslope poction of the stte. (iithin the love= slope poctlon of the site <br />(see TP-3) the gcound vatec elevatton appeacs to be at az neaz surface grade <br />elevatton. This condition appears to cceate a"spzinq" type appeazance at <br />this location. Seepage vas also observed along the dovnslope cut areas to the <br />southeast and east. <br />We expect that ground vater levels vill fluctuate seasanally on site. <br />Although, the vet atea neac TP-3 indicates that the gcound vater elevation <br />cemains neac sucface most oE the yeac. Foc the putpose of planning <br />excavation cuts ve cecoemend that gcound vatec levels 2 to 3 feet higher than <br />those obsezved be consideced. He also Eeel that theze is a possibility Eor <br />pezched vater to exist above the dciEt deposlt duzing and shoctly aftez heavy <br />cainfall. <br />CONCLUDING OPINIONS <br />Genecal <br />In genexal, ve conclude that the evaluated site azea should be campatible <br />vith the proposed =esidential development usage. Foundations should extend [o <br />the medium dense to densz undexlying sand deposit. This may zequize deep <br />foundation excavations foc the dovn hill portion oE the stLuctuce. The <br />pcesence of gzound vatec vill gxeatly influencz the excavations, theiz <br />stahllity and the excava�ion technique used. pe strongly cecommend that a <br />site topography map be developed ard the building excavations be deteimined <br />based on site elevations and expected soil and gcound vatez conditlons. Ne <br />curxently do not expect that the steep slope on the east poction of the site <br />vill tnfluence the buildlnq design or stability. This may be bettec <br />detecmined from the topoqzaphic infoLmation. <br />