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•� California Regional Water Quality Control Board <br />' Central Valley Region (a <br /> inston H Hickox Robert Schneider, Chair Gray Davis <br /> Secrc tarp for <br /> Ensnaatoenrnl Sacramento Main Office Governor <br /> Internet Address http Nwww swrcb ca gov/rwgcb5 <br /> Proteclron 3443 Rouuer Road Suite A Sacramento CahlOrnta 95927-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br />' TO Brian Newman FROM James Barton <br /> Senior WRC Engineer fE >neenng Geologist <br /> file SIGNATURE ` ,r <br />' DATE- 12 August 2003 <br /> SUBJECT SECOND QUARTER 2003, QUARTERLY PROGRESS REPORT, CHEVRON STATION <br /> #9-5775, 301 WEST KETTLEMAN LANE, LODI, SAN JOA QUIN COUNTY, REGIONAL BOARD <br /> CLEANUP AND ABATEMENT ORDER NO 5-00-704 <br />' I reviewed the Second Quarter 2003, Quarte?ly 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 /> 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 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 ggIL) 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 /> CP Recycled aper <br />' 7}te energy chaiienge facuig Ca forms is real Every needs to tike utunedute action to reduce energycomumpuon <br /> For 2 lice of stmote gnus sno can reduce denund and cut vour eners;v costs see our Wel,sae at http//wwwswmb ca gov/rwgcb5 <br />