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r y. California Regional Water Quality Control Board Central Valley Region Robert Schneider, Chair Sacramento Main Office Interned Address: http://www.swrcb.ca.gov/nvgcb5 3443 Routier Road, Suite A, Sacramento, Calit'ornia 95827-3003 Phone (916) 255-3000 - FAX (916) 255-3015 �!inston H. Hickox Secrruaryfor _. Enrirnnmenml I'rorecrron TO: DATE: Brian Newman FROM: James Barton Senior WRC Engineer E ineering Geologist file SIGNATURE: 12 2003 August u t ✓ T SUBJECT: SECOND QUARTER 2003, QUARTERLY PROGRESS REPORT, CHEI/RONSTATION #9-5775,301 WEST KETTLEMAN LANE, LODI, SANJOAQUIN COUNTY, REGIONAL BOARD CLEANUP AND ABATEMENT ORDER NO. 5-00-704 I reviewed the Second Quarter 2003, 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 monitoring 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 monitoring from quarterly to semi-annually in monitoring wells MW -2, MW -11A, MW -11B, MW -12A, MW -12B, MW -13, MW -20A, and MW -20B. r 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 trichloroethylene; 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 Ag/L). TPHg (maximum concentration I.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 Ag/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 benzene, and 1.2 gallons of MtBE since 2000. In the second quarter of 2003, the SVE system removed minimal contaminants (2 gallons of TPHg and no benzene or MtBE), and demonstrated no significant % SVE concentration rebound since the first quarter of 2003. 1 concur with SECOR's recommendation to California Environmental Protection Agency �y Recycled aper The energychalknge facing California is real. Every Caldornian needs to tike immediate action to reduce energy consumption. Fnr 2 list of simnle onus v U can reduce demand 2nd cut wur enert;vcosts, see our Website 2t hrtp://www.swrcb.c2.gov/rwgcb5