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TABLE 4 <br /> ESTIMATED MASS OF TPH-G REMAINING IN GROUNDWATER <br /> Co[berg Boat Works <br /> 401 North Stockton Street <br /> Stockton, California <br /> TPH-G Interval* Area of TPH-G Interval Volume of Affected Groundwater** Estimated Mass in Groundwater <br /> (ug[L) (ftp) (ft) (Ibs) <br /> 0-100 1,541 5,394 0 034 <br /> 100-200 948 3,318 0 041 <br /> 200-300 593 2,076 0 039 <br /> 300-400 395 1,383 0 035 <br /> 400-500 255 893 0 028 <br /> 500-600 178 623 0 023 <br /> 600-700 117 410 0 018 <br /> 700-800 71 249 0 012 <br /> 800-900 34 119 0 007 <br /> 900-960 5 18 0 001 <br /> Total Estimated Mass Remaining in Groundwater 0 238 <br /> Notes <br /> TPN-G -Total Petroleum Hydrocarbons as Gasoline <br /> u91L-micrograms per liter <br /> -Refer to isoconcentration map for contour interval(Based on 9129199 and 10/21/99 sample results) <br /> *• -Assumed effective porosity of 35 and aquifer thickness of 10 feet <br /> APEX ENWROTECH INC <br /> GROUNDWATER MASS ESTIMATION <br /> Page i of 1 COL01 001 <br />