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i • i <br /> TABLE 7 <br /> ESTIMATED MASS OF TPA-G REMAINING IN GROUNDWATER <br /> COLBERG 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 m Groundwater <br /> (fig/') (ftz) (ftz) (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 m Groundwater 0.238 <br /> Notes <br /> TPH-G-Total Petroleum Hydrocarbons as Gasoline <br /> (Pgll)-micrograms per liter <br /> "-Refer to isoconcentration map for contour interval(Based on 09/29/99 and 10/21199 sample results) <br /> **-Assumed effective porosity of 0 35 and aquifer ttuckness of 10 feet <br /> I <br />