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Mr. Harlan Knoll February 2, 2001 Page 3 Project No. 2007-0065-01 SAMPLING, ANALYSIS, AND MONITORING PROGRAM RESULTS Groundwater samples were collected from 11 monitoring wells on December 6, 2000 and forwarded to Alpha Analytical, Inc. for analysis. 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, and total xylenes (BTEX compounds) and five oxygenates (methyl tertiary butyl ether [MTBE], tertiary butyl alcohol [TBA], diisopropyl 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. Petroleum hydrocarbons and fuel oxygenates were not detected above laboratory reporting limits in the samples collected from monitoring wells MW-1, MW-2, MW-6, MW-9, and MW-10. The highest concentration of TPHG, benzene and MTBE were detected in well S-1 at 12 milligram per liter (mg/L), 42 microgram per liter (µg/Q, and 10,000 pg/L respectively. MTBE was detected in monitoring well MW-7 at 1.6 pg/l. . TBA was detected in the samples collected from monitoring wells MW-8, S-1, and S-2 at concentrations of 720, 8,000 and 190 µg/1, respectively. TAME was detected in the samples collected from monitoring wells MW-3, MW-8, and S-2 at concentrations of 4.3, 28, and 24 µg/l, respectively. SOIL VAPOR EXTRACTION SYSTEM Stratus oversaw the construction and installation of a SVES in July and August 2000 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 by the blower and abated in a catalytic oxidizer before discharge to the atmosphere. Tables 3, 4, and 5 show the operating time, air sample analytical results, and the destruction efficiency of the SVES, respectively. Field data sheets are presented in Appendix B. Figure 4 presents changes in influent TPHG concentrations since startup. During the fourth quarter 2000, 10 site visits were conducted to monitor, optimize system performance and conduct maintenance. Influent and effluent air samples were collected on October 19, and November 28, 2000 and forwarded to Alpha Analytical for analysis. Certified analytical reports and chain-of-custody documentation for air samples are included in Appendix C. CAProject Files\USA Gaso1ine100651Qtr1y14Q00.doc 5TRArus