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TABLE 6 <br /> ESTIMATED MASS OF MTBE REMAINING IN GROUNDWATER <br /> Colberg Boat Works <br /> 401 North Stockton Street <br /> Stockton, California <br /> MTBE Interval* Area of MTBE Interval Volume of Affected Groundwater*" Estimated Mass in Groundwater <br /> (ug/L) yt ) (ft) (lbs) <br /> 0-25 2,989 10,462 0 016 <br /> 25-50 2,010 7,035 0 022 <br /> 50-75 1,526 5,341 0 025 <br /> 75- 100 943 3,301 0 021 <br /> 100- 125 634 2,219 0 017 <br /> 125- 150 498 1743 0 016 <br /> 150- 175 355 1243 0 014 <br /> 175-200 308 1078 0 013 <br /> 200-225 82 287 10 004 <br /> Total Estimated Mass Remaining in Groundwater 0 149 <br /> Notes <br /> MTBE -Methyl Tertiary Butyl Ether <br /> 4 ug/L -micrograms per Liter <br /> t <br /> -Refer to isoconcentration map for contour interval(Based on 9129199 and 10/21/99 sample results) <br /> Assumed effective porosity of 0 35 and aquifer thickness of 10 feet <br /> APEX ENVIROTECH,INC <br /> GROUNDWATER MASS ESTIMATION <br /> Page 1 of 1 C01-01 001 <br />