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' lit Control Board <br /> California Regional Water Quality <br />' Central Valley Region <br /> -0 Robert Schneider,Chair <br /> n H. Hicicox Cray Davis <br /> ecrernr,for Sacramento Main Office Goveinor <br />' Environmental Internet Address http//www swrcb ca govtrwgcb5 <br /> Proiection 3443 Routier Road,Suite A,Sacramento,Calrfomia 95827 3003 <br /> Phone(916)255 3000•FAX(916)255-3015 <br /> TO- Brian Newman FROM. James Barton <br /> ' Senior WRC Engineer !!E >neenng Geologist <br /> file SIGNATURE. t <br /> r � T <br /> DATE- 12 August 2003 <br /> ' SUBJECT SECOND QUARTER 2003, QUARTERLY PROGRESS REPORT, CHEVRON STATION <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 momtonng from quarterly to semi-annually in monitoring wells MW-2, <br /> 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 /> (TPH-mo), benzene-tolune-ethylbenzene-xylenes (BTEX), volatile organic compounds (VOCs), <br /> ' including 1,2-dichlorethane, ethylene dibromide, and tnchloroethylene, 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 µg/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 12 gallons of MtBE since 2000. In the second quarter of 2003, the SVE system removed <br /> ' rnimmal contaminants (2 gallons of TPHg and no benzene or MtBE), and demonstrated no significant <br /> VE concentration rebound since the first quarter of 2003 I concur with SECOR's recommendation to <br /> ' California Environmental Protection Agency <br /> e Paper <br /> t The eaeigychalieage factrig GsLforrua is real EveryCaUorniaa needs to take urunedrate acuon to reduce energy consumption <br /> For a Im of sunple vans you can reduce demand and cut your eeergycosts,see our Web-sne at http//wwwswreb ca gov/rwgcb5 <br />