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5.0 INVESTIGATION RESULTS <br /> 5.1 Geology and Hydrogeology <br /> advancement of borings SB-01 I <br /> As indicated on the lithologic logs developed from the a'} <br /> through SB-04, soil encountered beneath the Property predominantly consists of a clayey silt <br /> to silty clay unit, which contains occasional fine sand to sandysilt stringers (from 6- to <br /> 1$-inches thick). This unit is generally olive brown to brown in color (although blue gray <br /> color was observed at SB-01 at depths greater than 16 feet bgs), is dry to saturated, of low to <br /> i <br /> medium plasticity and soft to medium stiff. A saturatedlsilty sand was encountered in boring <br /> SB-03 at approximately 22 feet bgs and extended to,the total depth of the boring at 25 feet <br /> bgs. However, moisture in the soil cores was first encountered at 11.5 feet bgs in SB-03, at <br /> iE d <br /> f. 13.5 feet in SB-01, and at 17.5 feet in SB-02; but the lithology between each boring was not <br /> consistent. Therefore, the borings were advanced to 25 feet bgs and were screened for <br /> sampling purposes from 25 to 15 feet bgs. �� + <br /> Yl} <br /> As discussed in Section 4.3, ground water levels were allowed ao stabilize in each of the <br /> boreholes within the well casing) and depth to round water measurements were then <br /> ( g) P g <br /> recorded. Surface elevations of each boring were surveyed on April 21, 1997, to allow for <br /> the calculation ofround water elevations at SB-01 SB-02 and SB-03 relative to mean sea <br /> g , <br /> v r <br /> L <br /> level (MSL). Ground water elevation calculations are rovided m Table 1• a round water <br /> { ) P . g <br /> elevation contour map is shown on Figure 3. As indicated on Figure 3, the ground water <br /> flow direction beneath the Property is to the north-northeast, with an approximate hydraulic <br /> gradient (dh/dl) of 0.02. <br /> 808-001.rpt104-29-971u/key dataf repo ns 12 <br /> t _ y <br /> j <br />