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04117/2001 12:42 209498?433 FIFTH FLOOR �•� RAGE ,02 <br /> E.w$iaor Ave.Wrd Poor <br /> y P.O.BOX 388, Stockton,CA 95201-0369 <br /> Phone: (209)468-3420 <br /> { I <br /> V APProv <br /> ed�'; 33� Cara on rlc bri�a. Ste 550 <br /> ,�pproved With�� �a 95682 <br /> Fax;(530)675 <br /> Date By <br /> Mr.Harlin Knoll Approval of these dans extends only to that <br /> San Joaquin County Public Health Services �W lch is shown and described hereon but <br /> 1 Environmental Health Division does not authorize or approve any omission <br /> 304 East Weber Avenue, 3 Floor of deviation of requirements of State laws or <br /> Stockton, California 95202 Lirdincae. <br /> Re: Workplan to Install a r Soil Vapor Extraction Well at USA. Station No. 65, � <br /> 2500 West Lodi Avenue,Lodi, California <br /> hear 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 /> t 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 I <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 I <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 (MSV'-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 imderground 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 /> Pumacle prepared and submitted a RAY 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 /> N <br /> CAPrajec:NeSNUSA GasoliaeTG651Workplans\65-warnplan.doc <br /> - -- - -- �- <br />