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ENVlRVNMtNIALnr-mmn uivi4nn. <br /> '2r4 E.Weber Ave.Third Poor <br /> p.0.,._ ;x 388, Stockton,CA 96201-0383 <br /> Phone: (209)468-3420 <br /> STRAT5 AMroved <br /> ENVSROf+iMENTAL, INC. �-� 330 Cam ron Park Drive, Ste 550 <br /> FJApproved with��l�l�,ft$ a 95682 <br /> Ois+ roved: SW%470j"-Fax;(530)676-6005 <br /> mdrks �"J D <br /> -- <br /> -Urafe rIQa- 9t�i-�6fr�-6 r--�-- <br /> Daie By <br /> Mr. Harlin Knoll Approval of these dans extends only to that <br /> San Joaquin County Public Health Services which is shown and descfted hereon but <br /> Environmental Health Division door not a�lithorize or approve any omission <br /> 304 East Weber Avenue, 3rd Floor cr eke via'don of requirements of State laws or <br /> Stockton, California 95202 Lwa1 Ordinances. <br /> Re: Workplan to Install a Soil Vapor Extraction Well at USA Station No. 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 workplan to install a soil vapor extraction (SVE) well at USA Station <br /> No. 65, located at 2500 West Lodi Avenue, Lodi, California (Figure 1). Stratus proposes <br /> to install and connect the new vapor extraction well to the existing SVE system. The <br /> proposed new SVE well will be screened in the vadose zone beneath the UST complex to <br /> address the petroleum hydrocarbon impact to soil and increase air flow rates from the <br /> subsurface. <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 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 /> CAProject FileslUSA Gasoline100651Workplans165-workplan.doc <br />