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Depths of Material <br /> ' Topsoil-Overburden <br /> Topsoil and overburden depths vary from 0 . 5 feet to 7 feet with an <br /> ' average depth of about 2 . 5 feet . See Exhibit I for a list of soils <br /> occurring on the site . <br /> Sand and Gravel <br /> Depending on the thickness of topsoil-overburden, sand and gravel <br /> deposits vary from 16-20 feet . The maximum depth to aggregate and <br /> mining is 20 feet . <br /> Shale-Bedrock <br /> ' The stratum immediately beneath the sand and gravel is the Pierre <br /> Shale . <br /> 1 <br /> D-4 <br />