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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> 4 www atc-enviro com <br /> 209 579 2221 <br /> 1'T 01 P," Fax 209 579 2225 <br /> A S S O C I A T E S I N C <br /> n NOV <br /> October 31, 2003 <br /> 54 25912 0003 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report - Second Quarter 2003, USA Gasoline Station #110, 2132 <br /> East Manposa Road, Stockton, California <br /> Dear Mr Knoll <br /> This report presents the results of quarterly groundwater moiutonng and sampling performed on <br /> May 28, 2003 by ATC Associates Inc at USA Gasoline Station#110 This work was performed <br /> on behalf of USA Petroleum Corporation The site is located at 2132 East Manposa Road, <br /> • Stockton, California (Figure 1) Sampling was performed to monitor the distribution of <br /> petroleum hydrocarbons in groundwater at the site and to determine the hydraulic gradient <br /> direction and magnitude in the uppermost aquifer <br /> SITE HISTORY <br /> The following site history information was obtained from GHH Engineering reports dated <br /> December 1997 and February 2000 In March 1987, PEG excavated four soil borings at the site, <br /> one of which was completed as a groundwater-monitoring well Total petroleum hydrocarbons as <br /> gasoline (TPHg) and benzene, toluene, ethylbenzene, and total xylenes (BTEX) were detected in <br /> the soil samples collected from the borings BTEX constituents were detected in the water <br /> sample collected from the monitoring well <br /> In October 1987, Applied Geo Systems installed two groundwater-momtonng wells at the site <br /> and collected groundwater samples Petroleum hydrocarbons were detected in the water samples <br /> collected from the wells and the hydraulic gradient was towards the northwest <br /> In September 1992, Park Corporation installed three groundwater-morutonng wells and one <br /> vapor extraction well A vapor extraction treatability study was performed and the groundwater <br /> quality was monitored In October 1995, Park Corporation installed three additional wells at the <br /> site Park Corporation performed quarterly monitonng and sampling until May 1997 <br /> s lenvwonmenta112591210003-StocktonlQuadlyl2QR 2003 doe 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />