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w <br /> J. H. KLEINFELDER & ASSOCIATES File No. 5-2008-1 <br /> January 22, 1973 <br /> PAGE TWO <br /> locations are shown on Plate I . The borings were 6-inch <br /> diameter holes drilled with flight-auger type drilling <br /> equipment . The borings were drilled to a 25-foot depth. <br /> In general, the soil conditions at these boring locations <br /> are comparable to those in Boring 2 drilled previously. The <br /> surface soil is dark-brown to black plastic clay to a depth <br /> of approximately 2 feet . Below that depth, the soil consists <br /> of interbedded strata of silty clay and clayey silt to the <br /> depths explored. <br /> Groundwater was not encountered in either Boring 3 or <br /> Boring 4 . Groundwater was measured in Boring 2 , drilled <br /> previously, at a depth of 47 feet 10 inches . <br /> PERCOLATION TESTS <br /> Both Borings 3 and 4 were initially filled with water <br /> to presoak the soil prior to performing the percolation <br /> tests . Boring 3 caved before we were able to perform the <br /> percolation test . Therefore , the percolation tests were <br /> performed in Boring 4 only. <br /> The procedure for performing the percolation test was <br /> the same as that followed previously. The hole was filled <br /> with water and allowed to presoak. The hole was then filled <br /> with water to a fixed reference point and the water allowed <br /> to percolate„ The rate at which the water percolated into <br /> the soil was measured . The percolation test data are <br /> presented on Plate V . <br />