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L <br /> 0 California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> �Viustoa H.Hlcko: Gray Davi <br /> Secretar}-for Sacramento Main Office <br /> Governor <br /> Erie rronnlenral Internet Address http//wwwsv.-rcbcagoy/rwqcb5 <br /> Prareerron 3443 Rouuer Road Suite A Sacramento Cahlornta 95827 3003 <br /> Phone(916)255 3000 FAX(916)255 3015 <br /> e� <br /> TO. Bnan Newman FROM James Barton <br /> Senior WRC Engineer E ineenng Geologist <br /> file SIGNATURE { <br /> DATE: 12 August 2003 <br /> SUBJECT SECOND QUARTER 2003. QUARTERLY PROGRESS REPORT, CHEVRONSTATION <br /> #9-5775, 301 WEST KETTLEMAN LANE, LODI, SANJOAQUIN COUNTY, REGIONAL BOARD <br /> CLEANUP AND ABATEMENT ORDER NO 5-00-704 <br /> I reviewed the Second Quarter 2003, Quarterly Progress Report, Chevron Station #9-5775, <br /> 301 West Kettleman Lane, Lodi, San Joaquin County, Cleanup and Abatement Order No 5-00-704 <br /> (Report); dated 14 July 2003, submitted on Chevron's behalf by SECOR International Incorporated <br /> (SECOR) The Report provides the analytical results of the April 2003 quarterly groundwater <br /> monitoring event, evaluates the effectiveness of the groundwater extraction(GWE) and soil vapor <br /> extraction(SVE) remedial systems, and states that SVE and GWE influent concentrations show <br /> asymptotic levels have been reached by both remediation systems The Report recommends shutting off <br /> the SVE system,continuing the groundwater pump and treat remediation for hydraulic control, and <br /> reducing groundwater monitoring from quarterly to semi-annually in monitoring wells MW-2, <br /> i MW-11A, MW-11B, MW-12A, MW-12B, MW-13, MW-20A, and MW-20B <br /> Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline('TPHg), and motor oil <br /> JCMH-mo); benzene-tolune-ethylbenzene-xylenes(BTEX); volatile organic compounds(VOCs), <br /> including 1,2-dichlorethane, ethylene dibromide, and trichloroethylene; and fuel oxygenates, including <br /> methyl tert-butyl ether(MtBE). MtBE was the only contaminant detected in all monitoring wells during <br /> April 2003 (maximum concentration, 15 gg/L) TPHg (maximum concentration 1.2 parts per million by <br /> volume) was the only contaminant detected in the SVE system influent gas Two gallons of TPHg were <br /> removed by SVE during the second quarter of 2003. MtBE(maximum concentration 17 µg/L) was the <br /> only contaminant detected in the GWE system influent <br /> Comments: <br /> 1) Regional Board Cleanup and Abatement Order No 5-00-704 requires that the SVE system be <br /> operated continuously The SVE system has removed 676 9 gallons of TPHg and 11 7 gallons of <br /> benzene, and 12 gallons of MtBE since 2000 In the second quarter of 2003, the SVE system removed <br /> minimal contaminants (2 gallons of TPHg and no benzene or MtBE), and demonstrated no significant <br /> . SVE concentration rebound since the first quarter of 2003 1 concur with SECOR's recommendation to <br /> California Environmental Protection Agency <br /> Recycied Paper <br />' The energychalknge fw-R C:aUonw n real Every Californian needs to take immediate action to reduce energy consurnpuon <br /> T or,Ins, of s,n ok,vs ecru c in reduce derrund and nn wur energs cases sec nun Web-sae at http sssTrh ca gnv/rw2lch5 <br />