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Mr.Harlin Knoll3 rd November 2, 2001 Page 3 Quarter 2001 QMR Project No. 2007-0065-01 influence of the SVE system) is consistent with previous monitoring events. Groundwater elevations decreased by approximately 1.5 feet in all monitoring wells except at MW-8, S-1, and S-2. SAMPLING, ANALYSIS, AND MONITORING PROGRAM RESULTS Groundwater samples were collected from 11 monitoring wells on August 8, 2001, and forwarded to Alpha Analytical, Inc. for chemical analysis. Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHG) using United States Environmental Protection Agency (USEPA) Method 8015B/DHS LUFT Manual, and for benzene, toluene, ethylbenzene, total xylenes (BTEX compounds), methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), disopropyl ether (DIPE), tertiary amyl methyl ether (TAME), and ethyl tertiary butyl ether (ETBE) using USEPA Method 8260B. Certified Analytical Reports with chain-of-custody documentation are included in Appendix C. A summary of the groundwater analytical data is presented in Table 2 and Figure 3. Benzene was detected in the groundwater samples collected from wells MW-8 (2.1 µg/l) • and S-2 (12 4g/l). The highest concentration of TPHG (9.2 mg/L) was detected in the sample collected from well MW-3, and the highest concentration of MTBE (2,600 µg/1) was detected in the sample collected from well S-2. Petroleum hydrocarbons and fuel oxygenates were reported below laboratory reporting limits in the samples collected from monitoring wells MW-1, MW-2, MW-6, MW-7, MW-9, and MW-10. These results are consistent with historical data. SOIL VAPOR EXTRACTION SYSTEM Stratus operated and maintained the SVES during third quarter 2001, under an authority to construct (ATC) issued by the SJVUAPCD. The system startup was conducted on August 15, 2000. The SVES consists of a 150 cubic feet per minute catalytic oxidizer with a 5 horsepower blower. Soil vapors are extracted from the subsurface using a blower and abated in a catalytic oxidizer before discharge to the atmosphere. Operating time, flow rates, and analytical results of air samples and the mass extraction and emission rates of the SVES, are shown on tables 3, 4, and 5, respectively. Field data sheets are presented in Appendix B. Figure 4 presents changes in influent TPHG concentrations and cumulative mass removed since startup. During the third quarter 2001, six site visits were conducted to monitor, optimize system performance, and conduct maintenance. Influent and effluent air samples were collected • on July 23, 2001, August 6, 2001, and September 5, 2001, and forwarded to Alpha PAUSA Gaso]ine100651Qtrly1200]\USA-65-3Q01.doe STRAW6