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" I <br /> i <br /> 1386 EAST BEAMER STREET <br /> { tl� WOODLAND CA 95776.6003 <br /> WI(03 (530) 668-5300, <br /> - FAX(530)662-0273 <br /> wege@mother.com <br /> WESTERN <br /> GEO-ENGINEERS <br /> CALIF.CONTRACTOR 4513857 <br /> REGISTERED GEOLOGISTS <br /> J Mr. Michael J. Infurna Jr. February 20, 2001 <br /> II Senior REHS <br /> Leaking Underground Fuel Storage Tank Program <br /> San Joaquin County Public Health <br /> Environmental Health Division(PHS-EHD) <br /> 304 East Weber Ave., Third Floor <br /> Stockton, CA. 95202 <br /> (209) 468-3454 <br /> RE: Workplan for defining the off-site TPHg plume laterally and vertically at former Regal Station <br /> R603 at 6425 Pacific Avenue, Stockton, California 95207. <br /> Dear Mr. Infiuna: <br /> INTRODUCTION <br /> This site is being considered for closure. Mr. Marty Hartzell of the California Regional Water <br /> Quality Control Board, Central Valley Region(CRWQCB-CVR) stated the following concerns: <br /> • The lateral and vertical extent of groundwater contamination has not been defined; <br /> • The groundwater has not been monitored for all fuel oxygenates and fuel additives; <br />{ • The status of a domestic water supply well southeast of the site has not been determined;and <br /> • The quarterly groundwater monitoring has not been conducted since January 1999. <br /> The following workplan has been developed to define the lateral and vertical extent of groundwater <br /> contamination east (downgradient) of MW12. The other three concerns are addressed and <br /> presented in Appendix B. <br /> i <br /> i <br />