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3330 Cameron Park Drive, Ste 550 <br /> Cameron Park, California 95682 <br /> 0{�2 P�i (530)676-6004--Fax:(530)676-6005 <br /> U 1:rstt <br /> February 28, 2002 <br /> Project No. 2007-0065-01 <br /> Mr. Marlin 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: Fourth Quarter 2001 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 the results of the fourth quarter 2001 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. A limited site investigation completed in <br /> March 1987 detected petroleum hydrocarbons in soil and groundwater beneath the site. <br /> The investigation included the drilling and sampling of four soil borings, two of which <br /> were completed as groundwater monitoring wells (S-1 and S-2). In August 1987, three <br /> additional groundwater monitoring wells were installed (MW-1, MW-2, and MW-3). <br /> Additional monitoring wells (MW-4, MW-5, MW-6, MW-7, and MW-8) were installed <br /> to assess the lateral extent of petroleum hydrocarbon impact to groundwater. Figure 2 <br /> presents the location of the monitoring 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 over-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 /> s� <br /> P:IUSA Gasoline100651Qtrly120011USA-65-4Q01,doe <br />