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a5 <br /> Mr.Harlin Knoll February 28,2002 <br /> 3rd Quarter 2001 QMR Project No. 2007-0065-01 <br /> Page 3 <br /> Groundwater elevations decreased by 1.01 feet to 3.40 feet in the monitoring wells since <br /> the previous sampling event (August 2001). <br /> SAMPLING, ANALYSIS, AND MONITORING PROGRAM RESULTS <br /> Groundwater samples were collected from 11 monitoring wells on October 27, 2001, and <br /> forwarded to Alpha Analytical, Inc. for chemical analysis. Groundwater samples were <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHG) using United States <br /> Environmental Protection Agency (USEPA) Method 8015B/DHS LUFT Manual, and for <br /> benzene, toluene, ethylbenzene, total xylenes (BTEX compounds), methyl tertiary butyl <br /> ether (MTBE), tertiary butyl alcohol (TBA), disopropyl ether (DIPE), tertiary amyl <br /> methyl ether (TAME), and ethyl tertiary butyl ether (ETBE) using USEPA Method <br /> 8260B. Certified Analytical Reports with chain-of-custody documentation are included <br /> in Appendix C. <br /> A summary of the groundwater analytical data is presented in Table 2 and Figure 3. The <br /> highest concentration of TPHG (9.4 milligrams per liter [mg/L]) was detected in the <br /> sample collected from well MW-3, and the highest concentration of MTBE (170 <br /> micrograms per liter [µg/L]) was detected in the samples collected from wells MW-3 and <br /> S-1. TPHG was also detected in samples collected from monitoring wells MW-4 and <br /> S-2. Benzene was detected only in the sample collected from monitoring well MW-3. <br /> Petroleum hydrocarbons and fuel oxygenates were reported below laboratory reporting <br /> limits in the samples collected from monitoring wells MW-1, MW-2, MW-6, MW-7, <br /> MW-9, and MW-10. These results are consistent with historical data. <br /> SOIL VAPOR EXTRACTION SYSTEM <br /> Stratus operated and maintained the SVES during fourth quarter 2001, under an authority <br /> to construct (ATC) permit issued by the SJVUAPCD. The system startup was conducted <br /> on August 15, 2000. The SVES consists of a 150 cubic feet per minute catalytic oxidizer <br /> with a 5 horsepower blower. Soil vapors are extracted from the subsurface using a <br /> blower and abated in a catalytic oxidizer before discharge to the atmosphere. <br /> Operating time, flow rates and analytical results of air samples, and the mass extraction <br /> and emission rates of the SVES are shown on tables 3, 4, and 5, respectively. Field data <br /> sheets are presented in Appendix B. Figure 4 presents changes in influent TPHG <br /> concentrations and cumulative mass removed since startup. <br /> During the fourth quarter 2001, five site visits were conducted to monitor, optimize <br /> system performance, and conduct maintenance. Influent and effluent air samples were <br /> collected on October 1, 2001, and November 5, 2001, and forwarded to Alpha Analytical <br /> PAUSA Gaso1ine100651Qtr[y1200I\USA-65-4QOl.doc 5rRATU5 <br />