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California Regional Water Quality Control Board 14, Central Valley Region (a tom H. Nlckox Robert Schneider, Chair Gray Davis Seer,faryfor Sacramento Main Office Governor Ent iionmenta! Internet Address http//www swrcb ca gov/rwgcb5 !'rotection 3443 Routicr Road,Suite A Sacramento California 95627 3003 Phone(916)255 3000 FAX(916)255-3015 TO: Brian Newman FROM. Jaynes Barton Senior WRC Engineer E ineering Geologist file SIGNATURE V DATE 12 August 2003 ' SUBJECT SECOND QUARTER 2003, QUARTERLY PROGRESS REPORT, CHEVRON STATION #9-5775, 301 WEST KETTLEMAN LANE, LODI, SANJOAQUIN COUNTY, REGIONAL BOARD ' CLEANUP AND ABATEMENT ORDER NO 5-00-704 I reviewed the Second Quarter 1003, Quarterly Progress Report, Chevron Station #9-5775, ' 301 West Kettleman Lane, Lodi, San Joaquin County, Cleanup and Abatement Order No 5-00-704 (Report), dated 14 July 2003, submitted on Chevron's behalf by SECOR International Incorporated (SECOR) The Report provides the analytical results of the April 2003 quarterly groundwater ' incrutonng event, evaluates the effectiveness of the groundwater extraction(GWE) and soil vapor extraction (SVE) remedial systems, and states that SVE and GWE influent concentrations show ' asymptotic levels have been reached by both remediation systems The Report recommends shutting off the SVE system,continuing the groundwater pump and treat remediation for hydraulic control, and reducing groundwater monitonng from quarterly to semi,-annually m monitoring wells MW-2, ' MW-11A, MW-I IB, MW-12A, MW-12B, MW-13, MW-20A, and MW-20B Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline(TPHg), and motor oil (TPH-mo), benzene-tolune-ethylbenzene-xylenes (BTEX), volatile organic compounds (VOCs), including 1,2-dichlorethane, ethylene dibromide, and tnehloroethylene, and fuel oxygenates, including methyl tert-butyl ether(MtBE) MtBE was the only contaminant detected in all monitoring wells during April 2003 (maximum concentration, 15 gg/L) TPHg(maximum concentration 1.2 parts per million by volume) was the only contaminant detected in the SVE system influent gas Two gallons of TPHg were removed by SVE during the second quarter of 2003 MtBE(maximum concentration 17 gg/L) was the only contaminant detected in the GWE system influent Comments: 1) Regional Board Cleanup and Abatement Order No 5-00-704 requires that the SVE system be operated continuously The SVE system has removed 676 9 gallons of TPHg and 11 7 gallons of F benzene, and 12 gallons of MtBE since 2000 In the second quarter of 2003, the SVE system removed mal r MtB contaminants (2 gallons of TPHg and no benzene oE), and demonstrated no significan inimt iSVE concentration rebound since the first quarter of 2003 I concur with SECOR's recommendation to California Environmental Protection Agency -std-11 1 uper 1 ' Thsimple energy challenge facu2g California is real. Every Udomsan needs to take immediate action to reduce energy consurnption 4 or a int of sple ant's you can reduce demand and cut your energy costs,see our Web stte at htt Fp//wwwswrcb ca gov/rwgcb5 i