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Boyett Petroleum,Manteca <br /> Third Quarter 2002 Groundwater Monitoring Report <br /> Page 5 <br /> 4.4 LABORATORY ANALYTICAL RESULTS <br /> 1 The laboratory analytical results indicate that BTEX constituents and TPH-G were not detected at or above the <br /> laboratory reported detection limits in the groundwater samples collected from MW-1, MW-2, MW-3, MW-6, <br /> MW-7, MW-8, and MW-9. The selected gasoline oxygenates/additives were not detected at or above the <br /> 1 laboratory reported detection limits in the groundwater samples collected from. MW-3, MW-6, and MW-8. <br /> MTBE was detected in the groundwater samples collected from MW-1, MW-2, MW-7, and MW-9 at <br /> concentrations of 1,700 µg/L, 330 µg/L, 12,000 µg/L, and 0.8 gg/L, respectively. TAME was detected in the <br /> groundwater samples collected from MW-1 and MW-7 at concentrations of 2.7 gg/L and 42 pg/L, respectively. <br /> The laboratory analytical results for the third quarter 2002 quarterly groundwater monitoring event are presented <br /> to Table 2, below. Historical groundwater monitoring data are presented in Appendix C. The laboratory <br /> 1 certificates of analyses and chain-of-custody record are included in Appendix D. <br /> TABLE 2 <br /> Laboratory Analytical Results (September 26, 2002) <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: pg/L gg/L pg/L pg/L mg/L pg/L pg/L <br /> I Analytical Method: 8260B 8260B 8260E 8260B 8015M 8260B 8260B <br /> Sample I.D. <br /> 3761-MW1-9126102 <0.5 <0.5 <0.5 <1.0 <0.05 1,700 2.7 TAME <br /> 3761-MW2-9/26/02 <0.5 <0.5 <0.5 <1.0 <0.05 330 <0.5-5.0 <br /> 3761-MW3-9126102 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5A <br /> 3761-MW6-9130102 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 3761-MW7-9/26/02 <0.5 <0.5 <0.5 <1,0 <0.05 12,000 42 TAME <br /> 3761-MW8-9126/02 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 3761-MW9-9126/02 <0.5 <0.5 <0.5 <1.0 <0.05 0.8 <0.5-5.0 <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 /> EtOH=ethanol <br /> TBA=tertiary-butanol <br /> DIPE di-isopropyl ether <br /> ETBE=ethyl tertiary-butyl ether <br /> TAME=tertiary-amyl methyl ether <br /> 1,2-DCA=1,2-dichloroethane <br /> EDB= 1,2-Dibromoethane <br /> 5.0 SENSITIVE RECEPTOR SURVEY <br /> t-onaor conducted a sensitive receptor survey within a 2,uuu-loot radius (study area) of the site on November <br /> 20, 2002, to identify potential areas of groundwater recharge or discharge (surface water bodies), schools, and <br /> potential water well users that could be impacted by migration of groundwater from the site (Figure 5, <br /> Appendix A). The sensitive receptor survey consisted of inquiries to the California Department of Water <br /> N . <br /> �1� CONDOR <br />