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Date April 2, 2003 <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, Inc./Gown 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 2003): <br /> 1. Stratus measured groundwater elevations and collected groundwater samples from wells MW-1 <br /> through MW-4, MW-6, MW-7, MW-9, and MW-10 on January 17, 2003. Well S-1 was dry. <br /> 2. Stratus compiled and evaluated groundwater monitoring data. <br /> 3. Stratus prepared and submitted a permit application package to San Joaquin Valley Unified Air <br /> Pollution Control District (SJVUACD)to abate and discharge soil vapors using activated carbon. <br /> 4. Stratus prepared and submitted a work plan for vertical assessment of groundwater impact. <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2003): <br /> 1. The next sampling event is tentatively scheduled for April 2003. Groundwater samples will be <br /> collected for laboratory analysis from wells S-1, S-2, MW-1 through MW-4, 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 (DIPE), and tertiary butyl alcohol <br /> (TBA) by EPA Method SW8260B. <br /> 3. Stratus will redevelop wells (3-1, S-2, and MW-8) used in the remediation of the site. <br /> Current Phase of Project: Remediation <br /> Frequency of Groundwater Sampling: All Wells=Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Groundwater Sampling Date: January 17, 2003 <br /> Is Free Product(FP)Present on Site: No <br /> FP Recovered This Quarter: No <br /> Cumulative FP Recovered to Date: NA <br /> Approximate Depth to Groundwater: 42.20 to 44.62 feet below top of well casing <br /> Groundwater Flow Direction: South-Southeast <br /> P:IUSA Gasolinel00651Qtriy120031USA_65_1Q03.DOC 5TRA TU5 <br />