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TABLE 9 <br /> ESTIMATED MASS OF MTBE REMAINING IN GROUNDWATER <br /> I <br /> COLBERG BOAT WORKS <br /> 401 NORTH STOCKTON STREET <br /> STOCKTON,CALIFORNIA <br /> I <br /> MTBE Interval* Area of MTBE Interval Volume of Affected Groundwater" Estimated Mass in Groundwater <br /> (11 1) <br /> (ft) at) (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 1,743 0 016 <br /> 150-175 355 1,243 0 014 <br /> 175-200 308 1,078 0 013 <br /> 200-225 82 287 0 004 <br /> Total Estimated Mass Remaing in Groundwate 0 149 <br /> Notes <br /> MTBE-Methyl Tertiary Butyl Ether <br /> (pgll)-micrograms per liter <br /> * - Defer to isoconcentration map for contour interval(Based on 09/29/99 and 10/21/99 sample results) <br /> **-Assumed effective porosity of 0 35 and aquifer thickness of 10 feet <br />