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' Groundwater Investigation,Monitor Well Destruction and Installation,and Interim Remediation Pucrip Test Report Boyett Petroleum,419 S.Main SL,Manteca,CA January 30,2004 Page 15 treated by filtration through coconut shell granulated activated carbon canisters prior to discharge to the ' City sanitary sewer system. .Pour water samples were collected during the pump test: two at the beginning and two at the end. ! Samples were collected from the influent port before the first carbon canister and from the discharge port ' after the final carbon canister following on-site treatment. All groundwater sample containers were sealed, labeled, and placed in a cooler chilled with ice and delivered under chain-of-custody procedures to Argon for analyses. The samples were analyzed using U.S. EPA and California-approved methods. 5.3 LABORATORY ANALYSES The groundwater samples collected during the pump test were analyzed for BTEX and selected gasoline ' oxygenates/additives by EPA Method 8260B, and TPH-G by Method 8015B. The selected oxygenates/additives included MTBE, EtOH, TBA, DIPE, ETBE, TAME, 1,2-DCA, and EDB. The analytical methods and analytical detection limits are presented in Table 7, below. ' Table 7 ump Test Laboratory Analytical Results November 18 and 21, 2003 Constituent: Benzene Toluene Ethyl Total Benzene Xylenes TPH-i MTBE Other Oxygenates Detection Limit: 0.5 0.5 0.5 1.0 50 0.5 0.5-5.0 Sample 1D µg/L µ€/L Ag/l µ!'/L µg/L µ/'IL "g/L* 3761E-In-11/18/03 <0.5 <0.5 Q.5 <1.0 <50 360 0.8 TAME 3761E-Out-11/18/03 <0.5 <0.5 <0.5 <1.0 <50 <0.5 <0,5-5.0 ' 3761B-In-11/21/03 <0.5 <0.5 <0.5 <1.0 <50 870 1.2 TAME 3761 B-Out-11/21/03 <0.5 <0.5 <0.5 <1.0 <50 <0.5 <0.5-5.0 *=See laboratory reports in Appendix F for actual laboratory reported detection limits. Other Oxygenates=MTBE,TBA,DI PE,ETBE,TAME,1,2-DCA,and EDB Unit Conversions: lig/l_=micrograms per liter= parts per billion(ppb) ' Laboratory analytical results for the groundwater sample collected from the influent port on November 18, 2003, indicate that TPH-G, BTEX, and gasoline oxygenates/additives, with the exception of MTBE ' and TAME, were not detected at or above the laboratory reported detection limits; MTBE and TAME were detected at concentrations of 360 µg/L and 0.8 µg/L, respectively. Laboratory analytical results for the groundwater sample collected from the influent port on November 21, 2003, indicate that TPH-G, BTEX, and gasoline oxygenates/additives, with the exception of MTBE and TAME, were not detected at ' or above the laboratory reported detection limits; MTBE and TAME were detected at concentrations of 870 tig/L and 1.2 }tg/L, respectively. Laboratory analytical results indicate that petroleum hydrocarbon constituents were not detected at or above the laboratory reported detection limits in either of the ' groundwater samples collected from the discharge port. Laboratory analytical results indicate that the treated groundwater met the requirements of the IWDP prior to discharge to the City sanitary sewer. 5.4 DISCUSSION Graphs in Appendix C show the response of the pumped well, MW-11, and the observation wells, MW-9 and EW-1, to the pumping rate of 8.7 gallons per minute {gpm) used during the pump test. Water level responses i to the drawdown at MWA 1 were observed at both observation wells. Unfortunately, the transducer at MW-9 . malfunctioned late in the active pumping period At the end of the three-day active pumping period, the pump was turned off and water level responses to the recovery were observed at MW-11 and EW-1 for a period of ' three days. 1 ' �� CONDOR