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i <br /> F <br /> Date April 27, 2004 <br /> USA GASOLINE QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 65 Address: 2500 West Lodi Avenue, Lodi, California <br /> } <br /> USA Gasoline Project Supervisor: . Charles Miller <br /> Consulting Co./Contact Person: . Stratus Environmental, Incl Gowri S. Kowtha, P.E. <br /> Consultant Project No: 2007-0065-01 <br /> Primary`'Agency/Regulatory ID No: Mr. Harlin Knoll, San Joaquin County Public Health Services 11356 <br /> WORK PERFORMED THIS QUARTER(First 2004): t <br /> 1. Stratus measured groundwater elevations and collected groundwater samples from wells MW-1 <br /> through MW-4, and MW-6 through MW-10 on January 7, 2004. Wells S-1 and S-2 were dry. <br /> 2. The SVE system was shutdown on February 11, 2004, to facilitate carbon change out. After 1 <br /> collecting verification samples,-the system was restarted on February 19, 2004. The system was <br /> shutdown on March 12, 2004, after detecting breakthrough in carbon. <br /> } 3. Stratus conducted seven site visits to restart the SVE system, to conduct operation and maintenance <br /> of SVE system, collect the compliance air samples and to shut down SVE system. <br /> i <br /> 4. Stratus compiled and evaluated groundwater monitoring data. <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2004): t <br /> i <br /> 1. The next sampling event is tentatively scheduled for April 2004. Groundwater samples will be <br /> collected for laboratory analysis from wells S-1, S-2, MW-1 through MW4, and MW-6 through <br /> MW-10. <br /> 2. Groundwater samples will be analyzed at a state-certified analytical laboratory for total petroleum <br /> hydrocarbons as gasoline (TPHG) by EPA Method SW8015BIDHS LUFT Manual, and for benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX), methyl tert-butyl ether (MTBE), tertiary amyl methyl <br /> ether(TAME), ethyl tertiary butyl ether (ETBE), di-isopropyl ether(DIPS), tertiary butyl alcohol (TBA), <br /> methanol, and ethanol by EPA Method SW8260B, <br /> 3. Stratus proposes to reinstall a 100 cfm catalytic oxidizer to extract and abate residual petroleum 1 <br /> hydrocarbons in the vadose zone. <br /> I Current Phase of Project: Remediation 1 Monitoring <br /> i <br /> Frequency of Groundwater Sampling: All Wells=Quarterly <br /> :E , <br /> Frequency of Groundwater Monitoring: Quarterly i <br /> l Groundwater Sampling Date: January 7, 2004 x <br /> } Is Free Product(FP) Present on Site: No <br /> FP Recovered This Quarter: No <br /> 1= <br /> i Cumulative FP Recovered to Date: NA <br /> Approximate Depth to Groundwater: 42.86 to 44.97 feet below top of well casing _ <br /> 6 PXSA Gasoline100651Qtrly120041USA_65_IQ04.DOC 51RATU5 <br /> ,l , <br /> I o <br /> i .I 9 <br />