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-9- <br />to be stiff to very stiff in consistency and the sands are generally <br />• medi~un dense. These soils are dry, light brown in color and are <br /> porous in places above a depth of approximately 7 feet. <br />Bedrock: Bedrock encountered beneath the site consists of claystone, <br />sandstone and siltstone. The fine rained bedrocks consist <br />predominantly of clay and silt particles with a minor percentage of <br />fine sand. Bedrock at the site appears to have been highly <br />overconsolidated by a combination of desiccation arc] a considerable <br />depth of overburden which has been subsequently removed by erosion. <br />The materials do not appear to be highly cemented and derive muds of <br />their strength from tight packing and bonding of the clay particles. <br />The bedrocks are generally interbedded. <br />Bedrock was encountered at depths varying from 4 to 30 feet <br />beneath the overburden soils, and bedrock was not encountered in <br />• Holes RP-2,3, R-4 and R-5. In general terms, it appears the <br />overburden soils are deepest near the valley bottoms and becane more <br />shallow along the higher portions of the valley sides. However, this <br />pattern is not uniformly consistent across the site. <br />Ground Water: Ground water levels were not encountered in the <br />exploratory test holes at the time of drilling and within several days <br />after drilling. <br />Percolation Tests: The location of four percolation tests conducted <br />in the area of Sediment Rids RP-1 and RP-2,3 are shown on Fig. 3. <br />The percolation test results are presented in Table II. Based on the <br />information obtained, it appears that the sandy to very sandy clays <br />and clayey cards at the site have percolation results that are <br />r 1 <br />U <br />