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Date Range Feet Layer <br /> 1 -15 0-6 6 Soil <br /> 6-25 19 Fire Sand <br /> 25-70 45 Medium Sand <br /> 70-100 30 Fine/Medium Sand <br /> 100-120 20 Clad' <br /> 120-160 40 Coarse Sand <br /> 160-170 10 Clay <br /> 170-260 90 Coarse Sand. <br />