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<br />- 3- <br /> <br />a screening plant or crushing plant was located in one area because of <br />the large number of fine, crushed particles of sand and gravel. In some <br />portions of the proposed disposal site a brown, highly cemented sandstone <br />is exposed on the surface. Over most of the site small irregular ridges of <br />the sand and gravel still remain. <br />SUBSURFACE CONDITIONS <br />We attempted to investigate subsurface conditions at the site with a <br />~, <br />small hydraulic backhoe on September 27, 1979. Several pigs were attempted <br />at random locations throughout the proposed disposal site area. ~ard, sand-~ <br />stone bedrock was encountered at depths ranging from the ground surface to c' <br />~, a maximum of 3 feet below the ground surface. The bedrock was sufficiently` <br />well cemented that it could not be excavated with the backhoe. The surficial <br />materials consisted of a loose mixture of sand and gravel and small cobbles, <br />which were quite well rounded, indicating a stream method of deposition.• <br />'de also encountered materials containing gravel and cobble which were quite <br />well cemented. It is possible that the deposit which was previously mined <br />from this site was a poor to moderately cemented conglomerate associated with <br />the sedimentary bedrocks common to this area. In the cut slopes below the <br />proposed disposal area shale and sandstone was exposed. <br />The surficial layer of sands and gravels was relatively clean and con- <br />4 <br />tained a wide assortment of sizes, as evidenced by the results of grain size <br />distribution tests presented on Figs. 3 and 4. <br />