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r <br /> California Regional Water Quality Control Board <br /> Central Valley Regfon <br /> Robert Schneider,Chair <br /> Madon H.Hickox Cray Dav <br /> ' Secrernryjar Sacramento Main office Governor <br /> overnor <br /> Environmental Internet Address h11p Nwww swrcb ca gov/rwgcb5 <br /> Protection 3443 Rowier Road,Suite A,Sacramento California 95827 3003 <br /> Phone(916)255 3000 FAX(916)255 3015 <br /> w <br /> TO: Brian Newman FROM. James Barton <br /> Senior WRC Engineer E ineering Geologist <br /> file SIGNATURE <br /> DATE- 12 August 2003 <br /> SUBJECT. SECOND QUARTER 2003, QUAR TERL Y PROGRESS REPORT, CHEVRON STA TION <br /> #9-5775, 301 WEST KETTLEMAN LANE. LODI, SANJOAQUIN COUNTY, REGIONAL BOARD <br /> CLEANUP AND ABATEMENT ORDER NO 5-00-704 <br /> 1 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 /> l (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 /> j MW-1 IA, MW-1 IB, 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 /> (TPH-mo); benzene-tolune-ethylbenzene-xylenes (BTEX); volatile organic compounds(VOCs), <br /> mcluding 1,2-dichlorethane, ethylene dibromide, and trichloroethylene, and fuel oxygenates, including <br /> methyl tert-butyl ether(M(BE). MtBE was the only contaminant detected in all monitoring wells during <br /> April 2003 (maximum concentration, 15 gg/L) TPHg(maximum concentration 12 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 gg/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 1.2 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 /> r SVE concentration rebound since the first quarter of 2003 1 concur with SECOR's recommendation to <br /> California Environmental Protection Agency <br /> The energyclu&nge facusg CaUwt ra is real. $veryCahfonaun needs to Ulm unrnedrare acaon to induce energy cons urydon <br />'' I For a lut of sunple 4+ays vvu cut reduce demand and cut your energy costs see our Web-sae at http//wwwswmb a gov/rwgcb5 <br />