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l Loavnb C Bvuwn Jk <br /> Mnnmr.Rnowci r.; <br /> -�-' Mo <br /> I'll 101 <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board <br /> TO: File: New West Petroleum (AKA Flag City Shell) <br /> 6437 Banner Street <br /> Lodi, San Joaquin County <br /> FROM: Jim Barton4j) <br /> Engineering Geologist <br /> UST UNIT 2 <br /> DATE: 26 November 2012 <br /> SUBJECT: UST CASE CLOSURE, NEW WEST PETROLEUM #1003 <br /> (AKA FLAG CITY SHELL), 6437 BANNER STREET, LODI, <br /> SAN JOAQUIN COUNTY, CLEANUP AND ABATEMENT ORDER <br /> R5-2007-0709 (CASE 391163). <br /> Site Background <br /> New West Petroleum #1003 (Site) is currently a vehicle fueling station, convenience <br /> store, and restaurant located at 6437 Banner Street in the Flag City industrial park near <br /> the intersection of Interstate 5 and State Highway 12, approximately 10 miles west of <br /> Lodi (Attachment 1). Fueling operations at the Site began in 1996. The underground <br /> storage tank (UST) complex consists of two 10,000-gallon gasoline USTs and one <br /> 20,000-gallon diesel UST. <br /> During groundwater monitoring at the nearby Flag City Chevron station in March 2002, <br /> methyl tert-butyl ether (MtBE) was detected in an upgradient Chevron monitoring well <br /> (MW-8A) at 700 micrograms per Liter (Ng/L). MW-8A had been non-detect for MtBE for <br /> ten prior sampling events (seven quarters). Groundwater at MW-8A remained impacted <br /> after groundwater monitoring ceased for Chevron; however, MtBE concentrations had <br /> declined to 74 ug/L by December 2006. Four additional upgradient Chevron wells <br /> MW-19A/B (in Banner Street, south of the Site dispensers) and MW-20A/B (McDonalds <br /> restaurant parking lot), installed and sampled in May and December of 2004, reported <br /> MTBE up to 5,300 ug/L. <br /> In April 2005, the San Joaquin County Environmental Health Department (SJCEHD) <br /> issued an unauthorized release for the Site. Six monitoring wells (MW-1, MW-2, <br /> MW-3A, MW-313, MW-4A, and MW-4B) were installed onsite by August 2005. MtBE <br /> was detected at 56,000 pg/L in MW-3A, located 20' downgradient of the Site USTs and <br /> screened at 10' to 25' below ground surface (bgs) in the designated A zone. MtBE was <br /> also detected at 360 pg/L in MW-4B, located approximately 215' southeast of the Site <br /> KAR_ E. -omcLEv SCD, P.E.. cIWR I PAMELA C CREeoorr P.E.. ©CEL ExEcu.rvE oreiceR <br /> 11020 Sun Cerner❑rive rv290,Rancno Cordova.CA 95570 ww warerboartlsca.9ovmenvalvaliey <br /> t)r.L OVOl El'Ier Is <br />