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L <br /> `T ' TfIS AUG 0 2 zaoz; <br /> virzoNMENTA� i�C; w : . 3330 Cameron Park Drive, Ste 550 <br /> ENVIRONMENT HEALTH Cameron Park, California 95682 <br /> (530)676-6004-Fax:(530)676-6005 <br /> July 31, 2001 <br /> Project No. 2007-0065-01 <br /> Mr. Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Re: Second Quarter 2002 Groundwater Monitoring Report and Soil Vapor Extraction <br /> System Data for USA Station 65, 2500 West Lodi Avenue, Lodi, California <br /> Dear Mr. Knoll: <br /> On behalf of USA Gasoline Corporation (USA), Stratus Environmental, Inc. (Stratus) has <br /> prepared this report presenting results of the second quarter 2002 groundwater <br /> monitoring event conducted at USA Station 65, located at 2500 West Lodi Avenue, Lodi, <br /> California (Figure 1). Information regarding the operation of a soil vapor extraction <br /> • system (SVES) is also included in this report. <br /> BACKGROUND <br /> The majority of information provided in this section was gathered from a Remedial <br /> Action Plan (RAP) prepared by Pinnacle Environmental Solutions, Inc. (Pinnacle), a <br /> division of EMCON, dated January 26, 1999. <br /> A limited site investigation completed in March 1987 detected petroleum hydrocarbons <br /> in soil and groundwater beneath the site. The investigation included the drilling and <br /> sampling of four soil borings, two of which were completed as groundwater monitoring <br /> wells (S-1 and S-2). In August 1987, three additional groundwater monitoring wells <br /> were installed (MW-1, MW-2, and MW-3). Additional monitoring wells (MW-4, MW-5, <br /> MW-6, MW-7, and MW-8) were installed to assess the lateral extent of petroleum <br /> hydrocarbon impact to groundwater. Figure 2 presents the location of the monitoring <br /> wells. <br /> Three gasoline underground storage tanks (USTs) and associated piping were removed <br /> and replaced on October 6 and 7, 1987. Approximately 500 cubic yards of hydrocarbon- <br /> impacted soil were excavated and removed from the site during these remediation - <br /> activities. <br /> Pinnacle prepared and submitted a RAP in January 1999. The RAP recommended the <br /> construction, installation, and operation of a soil vapor extraction and air sparge system <br /> to mitigate the petroleum hydrocarbon impact to soil and groundwater. <br /> P:IUSA Gasoline100651Qtriy120021USA_65_2Q02.doc <br />