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i� 3330 Cameron Park Drive, Ste 550 <br /> Cameron Park, California 95682 <br /> rt (530)676-6004-Fax:(530)676-6005 <br /> February 2, 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: Fourth Quarter 2000 Groundwater Monitoring Report for USA Station 65, <br /> 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 2000 groundwater <br /> monitoring event conducted at USA Station 65, located at 2500 West Lodi Avenue, Lodi, <br /> California (Figure 1). Also included in this report is data collected during the operation <br /> of a soul vapor extraction system (SVES), which began operation during the third quarter <br /> 2000. <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). 7n 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 all monitoring wells. <br /> Three gasoline underground storage tanks (USTs) and associated piping were removed <br /> and replaced on October 6 and 7, 1997, Approximately 500 cubic yards of hydrocarbon- <br /> impacted soil were excavated and removed from the site during these 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 to <br /> mitigate the petroleum hydrocarbon impact to soil and groundwater. <br /> i <br /> CAProject FileslUSA Gasohne100651Qtr1y14Q00.doe <br />