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1 <br /> ' 1444 MARIPOSA ROAD <br /> • WKA No 2938 06 <br /> September 6, 2000 <br /> ' Page 13 <br /> SUMMARY OF WELL SURVEY DATA <br /> 17111 <br /> s■ <br /> i <br /> .41F 1 <br /> : i Ma <br /> ' NA 2118 East Charter 1 NA 500 feet northwest <br /> NA 2150 East Charter 1 NA 500 feet northeast <br /> Mormon Slough North of the site surface -- 500 feet north of the site <br /> water <br /> Offsite well locations and surface water are presented on Plate No 2 Copies of available Water <br /> 1 Well Drillers Reports, State well numbers,boring logs and well construction details are provided <br /> in August 20, 1999 Report of Findings for Additional Subsurface Soil and Groundwater <br /> 1 Investigation presented to San Joaquin County Public Health Services <br /> Mass Balance Calculations <br /> In addition to the above-mentioned activities,we also performed detailed mass balance <br /> 1 calculations to evaluate the volume of contaminants remaining potentially in soil and <br /> groundwater beneath the property The calculations were completed using EPA accepted <br /> ' weighted statistical analyses methods (U S EPA, 1992) The assumptions used to estimate the <br /> volume of contamination in subsurface soil and groundwater are highly conservative and <br /> 1 included the following <br /> ' Impacted area <br /> • approximately 4,650 square feet(372,000 ft)of contaminated soil in the vicinity of the <br /> ' former USTs <br /> • an eighty foot soil column was impacted <br /> • an average contaminant concentration was used throughout the entire impacted area <br /> • subsurface soils are primarily homogenous <br /> 1 Data <br /> • results of laboratory analysis of soil samples obtained from soil bonngs <br /> 1 I <br /> � o <br /> 1 <br /> DDD <br /> WALLACE KUHL <br /> Headed Paper &ASSOCIATES INC <br />