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Crow-Western E-2708 <br />August 14, 1985 Page 3 <br />logs, Plates 4 through 10, for a detailed description of the <br />coniitions encountered at each location exploreG. A description <br />of the field exploration methods and labcraLory testing program is <br />included in tliis report followiny the Discussion and <br />Recommendations section. The following is a c�eneralized <br />description of the subsurface conditions encountered. <br />Generally the site is immediately underlain by two to three <br />feet oE lcose sands and sandy silts. Beneath this surficial <br />mantle, our test pits encounLered dense sandy "till" soils. <br />The exception to this description was encountered in Teat Pits <br />TP-1 through TP-3 where from one to six feet of loose to medium <br />dense Eill soils were encounCered. Beneath the fills, Test Pits <br />TP-1 and 1'P-2 encountered one to two Eeet of organic soils, <br />respectively. All of these test pits were terminated within dense <br />native till soils. Additional shallow fills were encountered in <br />Test Pit TP-13. <br />Groundwater <br />The groundwaCer seepage levels observed while excavatiny are <br />shown on the test pit lor�s. Gr�undwater seepaye was enco�ntered <br />in Test Pits TP-2 and 'I'Y-9 through TP-6. Generally, on sites such <br />as this which are underlain at relatively shallow depths by dense <br />fill soils, "perche�i" water tahles Eorm during the winter. These <br />perched groundwater conditions iorm when water inEiltral-es through <br />the more permeable near-surEace soils and subsequently becomes <br />"perct�ed" above the nearby impecmeable till soils. The <br />groundwaCer seapage level is not sl:atic, thus one may expect <br />fluctu,srions in the level depending on the amount oE rainEall, <br />surEace wal-er runoff, and otl�er factors. Generally tl�a water <br />level is higher in the weCter winL-er months. <br />DISCUSSION AND RECOl�MEliUATIONS <br />General <br />The three salient geoCachnical aspects uf this site are: <br />1) the loose uncontrolled fills present on portions of. the <br />site <br />2) the fine grained moisture sensitive nature oE the site <br />suils <br />3) the low relieE and near surface perche�9 gcoundwater tables <br />The loose fills are not. capahle of. supporting the proposed <br />struclures without excessive ciifEerenlial settlements. Tn order <br />ticnh Consultants, In- <br />