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rl ] <br /> First Quarter 2004 Groundwater Monitoring Report <br /> Boyett Petroleum,419 5,Main,Manteca,CA <br /> Page 4 <br /> • TABLE 3: Laboratory Analytical Results arch 4, 2004 <br /> Oxygenates/Additives <br /> B T E X TPH-G <br /> MTBE Other Oxygenates/Additives <br /> Detection 0.5 0.5 0.5 1.0 0.05 0.5 0.5-5.0 <br /> Limits: µg/L Itg/L }tg/L µg/L mg/L. p,glL gg/L <br /> Analytical Method: 8260E 8260.8 8260B 82608 8015B 8260B 82608 <br /> ,Sample LD. <br /> 3761-MW2-314/04 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 3761-MW3-3/4104 <0.5 <0.5 <0.5 <1.0 <0.05 1.2 <0.5-5.0 <br /> 3761-MW4R-314/04 <0.5 <0.5 <0.5 <1-0 <0.05 34 <0.5--5.0 <br /> 3761-MW6-3/4/04 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 3761-MW7-314/04 <0.5 <0.5 <0.5 <1.0 <0,05 74 <0.5-5.0 <br /> 3761-MW8-3/4/04 <0.5 <0.5 <0.5 <1.0 <0.05 19 <0.5-5.0 <br /> 3761-MW9-3/4/04 <0.5 <0.5 <0.5 <1.0 <0.05 2.4 <0.5-5.0 <br /> 3761-MW10-3/4/04 <0.5 <0.5 <0.5 <1.0 <0.05 660 TAME-1.3 <br /> 3761-MW 11-3/4/04 <0.5 1 <0.5 <0.5 <1.0 <0.05 130 <0.5-5.0 <br /> <0.5 10 <0.05 53 <0.5-5.03761 W1- 4 0.5 <br /> Unit Conversions: Analytical <br /> µg/L:parts per billion(ppb). BTEX=benzene,toluene,ethyl benzene,and total xylenes. <br /> mg/L:parts per million(ppm). TPH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> MTBE=methyl tertiary-butyl ether. <br /> Other oxygenates/additives= ethanoi (EtOH),tertiary-butanol(TBA), di-isopropyl ether(D1PE), <br /> ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl ether ('CAME), 1,2-dichloroethane (1,2- <br /> DCA),and 1,2-dibromoethane(EDB). <br /> Laboratory analytical results indicate that BTEX constituents, gasoline oxygenates/additives other than <br /> MTBE and TAME, and TPH-G were not detected at or above the laboratory reported detection limits in <br /> the groundwater samples collected from the monitor wells. MTBE was detected in the groundwater <br /> samples collected from MW-2, MW-4R, MW-7 through MW-11, and EW-1. TAME was detected in the <br /> groundwater sample collected from MW-10. The concentration of MTBE in the groundwater samples <br /> collected from MW-3, MW-4R, MW-8, MW-10, and EW-1 increased relative to the previous sampling <br /> event conducted on December 31, 2003. The concentration of MTBE in the groundwater samples <br /> collected from MW-7, MW-9, and MW-11 decreased relative to the previous sampling event. <br /> FUTURE WORK/RECOMMENDATIONS <br /> In the Additional Groundwater Investigation, Monitor Well Destruction and Installation, and Interim <br /> Remediation Pump Test Report, dated January 30, 2004, Condor recommended the installation and <br /> operation of a groundwater pump and treat system using MW-11 as a groundwater extraction well to <br /> remediate contaminated groundwater at the site. Condor recommends continuation of quarterly <br /> groundwater monitoring at the site. <br /> LIMITATIONS <br /> MITATION,S <br /> This report was prepared under the direct supervision of a Registered Geologist in the State of California. <br /> The standard of care for all services performed or furnished by Condor is commensurate with the care and <br /> 1 <br /> ca CONDOR <br />