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i i • <br /> TABLE 8 <br /> ESTIMATED MASS OF BENZENE REMAINING IN GROUNDWATER <br /> COLBERG BOAT WORKS <br /> 401 NORTH STOCKTON STREET <br /> STOCKTON,CALIFORNIA <br /> Benzene Interval* Area of Benzene Interval Volume of Affected Groundwater" Estimated Mass in Groundwater <br /> (pg") (ft') (ftp) (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 /> (µg11)-micrograms per liter <br /> *-Refer to isoconcentration map for contour interval(Based on 09/29/99 and 10/21/99 sample results) <br /> �*-Assumed effective porosity of 35 and aquifer thickness of 10 feet <br />