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Date April 6, 2006 <br /> • <br /> USA GASOLINE QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 65 Address: 2500 West Lodi Avenue, Lodi, California <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 Coun Public Health Services 11356 <br /> WORK PERFORMED THIS QUARTER(First 2006): <br /> 1- Stratus measured groundwater elevations and collected groundwater samples from wells MW-1 <br /> through MW-4, MW-6 through MW-10, and S-2 on January 9, 2006. Well S-1 was dry. <br /> 2. Stratus visited the site six times to routine operation and maintenance, and to collect compliance <br /> verification discharge samples. <br /> 3. Stratus compiled and evaluated groundwater monitoring data. <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2006): <br /> 1. In a letter dated March 29, 2006, SJCEHD requested a work plan to perform confirmation soil and <br /> • groundwater sampling. Stratus will prepare and submit the requested work plan by April 28, 2006. <br /> 2. The next sampling event is tentatively scheduled for April 2006. Groundwater samples will be <br /> collected for laboratory analysis from wells MW-1 through MW-4, MW-6 through MWA 0, S-1, and S-2. <br /> 3. 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 tertiary butyl ether (MTBE), tertiary amyl methyl <br /> ether (TAME), ethyl tertiary butyl ether (ETBE), di-Isopropyl ether (DIPE), tertiary butyl alcohol (TBA), <br /> methanol, and ethanol by EPA Method SW8260B. <br /> 4. Because the influent concentrations to the SVE system have decreased to non-detect levels, Stratus <br /> will shut down the SVE system permanently. <br /> 5. Stratus will prepare and submit a work plan to collect compliance samples for closure. <br /> Current Phase of Project: Remediation 1 Monitoring <br /> Frequency of Groundwater Sampling: All Wells=Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Groundwater Sampling Date: January 9,2006 <br /> Is Free Product(FP) Present on Site: No <br /> FP Recovered This Quarter: NA <br /> Cumulative FP Recovered to Date: NA <br /> • Approximate Depth to Groundwater: 44.37 to 46.47 feet below top of well casing <br /> K:IUSA Gasoline100651Qtrly120061USA_65_IQ06.DOC Sr"TU5 <br />