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TABLE 5 <br /> ESTIMATED MASS OF BENZENE REMAINING IN GROUNDWATER <br /> Colberg Boat Warks <br /> 401 North Stockton Street <br /> Stockton, California <br /> Benzene Interval* Area of Benzene Interval Volume of Affected Groundwater" Estimated Mass in Groundwater <br /> (ug/l-) ( ) (ft) (lbs) <br /> 0-30 '1,380 4,830 0 009 <br /> 30-60 1,077 3,770 0 014 <br /> 60-90 522 1,827 0 010 <br /> 90-120 359 1,257 0 009 <br /> 120-150 218 763 0 007 <br /> 150-180 135 473 0 005 <br /> 180-210 70 245 0 003 <br /> 210-240 22 77 0 001 <br /> Total Estimated Mass Remaining in Groundwater 0 060 <br /> Notes <br /> ug1L -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 0 35 and aquifer thickness of 10 feet <br /> APEX ENVIROTECH INC <br /> GROUNDWATER MASS ESTIMATION <br /> Page 1 of 1 COL01 001 <br />