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• Silty to clayey alluvial sediments: 10- 15 ft bgs <br /> • Sand- 15 -25 ft bgs <br /> • Clay layer: 25-30 ft bgs <br /> • Silty-to-coarse grained sand: 30-40 ft bgs <br /> • Clay layer: 40-50 ft bgs <br /> • Depth to groundwater at present: —20 ft bgs <br /> • Fuel leak occured when groundwater was 10-15 ft lower <br /> 0 Most hydrocarbons occur 30-40 ft bgs, in saturated zone <br />