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....-�. ..Si.`^..i c' ^!,' C;��i. ��:i,. <br />;�\.L i•. <br />dcposits, and elxial out�vash. Thc glacial till gcncrally consists of vcry densc, slighlly gravclly <br />to gravelly, silty sand. Advance ouhvash consists of very dense, slightly silty to silty sand anct <br />slightly claycy, sandy silt. The advance outwash has localized arcas that are slighdy gravelly to <br />gravclly. Thc glaciolacustrinc dcposits arc hard and vary from silty day/clayey silt to slightly <br />sandy, sli�htly claycy silt. Thcsc finc-graine:l deposits have scattered to numerous silty, fine <br />s.md partings/scams and slickcnsidcs. In somc arcas, scatt�.rcd scams of highly plastic day wcrc <br />notcd in thc glaciolacnstrinc dcposits. <br />A few borings ncar the garagc cncountercd nr.u� surface fill that was 3 to 3 fcet thick. Boring <br />R-1 I, loc:ded bet���ecn the proposed and existing Administration Buildings, encountered 28 fect <br />of vcry loosc fill, which ���as probabiy placcd during construction of thc cxisting Administration <br />13uilding. <br />'l.3 Grouncl��atcr <br />Groundwatcr conJitions wcrc evalu�tcd by obscrvations madc dwing drilling and by inst�lling <br />observation wells in borings B-9, B-I 1, [3-14, B-17, and I3-18. \Vet, caving soils were <br />cncountcrcd in borings B-12A, B-16A, and B-16B. Thc rccent mcasurcmcnts indicatc that thc <br />ground�vatcr clevations in the wclls rangc bchvccn about 106 and 126 fcct, or about 26 to 36 feet <br />bclow ground surfacc. Spccifically, groundwatcr cicvations in wclls B-9 :md Q-17 currcnUy <br />rc�ngc from about l06 to l lS fcct, whilc �eclls B-I 1, I3-14, and [3-IS arc at about l20 to l2G fcct. <br />AIIIIOU�'Il I70 b'fOUfl(I\4'BICI� \1�as obscn�cd during drilling of boring B-9, thc groundwatcr Icvcl was <br />suhsequcntly mcasured about 2S feet bclo�v ground surface in thc monitorin� well installed :u <br />that location. Bascd on boring I3-9, it is likcly that othcr Uoiings whcrc groimdwatcr was not <br />oUscrvcd during drilling may in fact be wet during :� morc cstcndcd exca��ation timc. It was <br />difficult ro otdain dcfinitc gmund�vater Ie��el obscrvations during drilling, cspccially where mud- <br />rotary drilling techriqucs wcrc uscd. IntcrUcds of �vatcr-bcaring sand and silt may bc <br />encountered ���ithin the glaciolacusuine deposits. O��erall, we anticipate that the ground���ater <br />gradicnt runs from wcst-southwest to cast-northcast. Ground���atcr lcvcls may fluctuatc <br />SC.15011.1I I y. <br />\1'hcre oUser�-ed, ground���uler �ras notcd during drilling and ground���ater Icvels in wells wcre <br />re.id scveral timcs. Both thc during-drillin� and most recent measurements of ground�vater <br />Ic��cls :uc nutcd on thc boring logs. <br />zi.i.m:a��4�sr.r„� i�a '_'1-I-096�1d-005 <br />