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!i fi <br /> First Quarter 2006 Groundwater Monitoring Report <br /> Boyett Petroleum,419 S.Main,Manteca,CA <br /> Page 3 <br /> • The laboratory analytical results for the first quarter 2006 quarterly groundwater monitoring event are <br /> presented in Table 3. A map presenting MTBE concentrations in groundwater is included as Figure 4, <br /> attached. <br /> Table 3: Laboratory Analytical Results arch 27 2006 <br /> Other <br /> B T E X TPH-G MTBE Oxygenates/ <br /> Additives <br /> Detection 0.5 0.5 0.5 1.0 0.05 0.5 0.5-5.0 <br /> Limits: ltg/L µg/L µg/L µg/L mg/L µg/L pg/L <br /> Analytical Method: 8260B 8260B 8260B 8260B 8015M 8260B 8260B <br /> Well I.D. <br /> MW-2 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-3 <0.5 <0.5 <0.5 <1.0 <0.05 <0,5 <0.5-<5.0 <br /> MW-4R <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-6 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-7 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-8 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-9 <0.5 <0.5 <0.5 <1.0 <0.05 1.0 <0.5-<5.0 <br /> • MW-10 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-11 <0.5 <0.5 <0.5 <1.0 <0.05 100 <0.5-<5.0 <br /> EW-1 <0.5 <0.5 <0.5 1 <1.0 <0.05 23 1 <0.5--<5.0 <br /> Unit Conversions: Analytical <br /> pg/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=ethanol(EtOH), tertiary-butanol(TBA),di-isopropyl ether(D1PE), <br /> ethyl tertiary-butyl ether(ETRE), tertiary-amyl methyl ether("TAME), 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 TPH-G were not detected at or above the laboratory reported detection limits in the <br /> groundwater samples collected from the monitoring wells. MTBE was detected in the groundwater <br /> samples collected from MW-9, MW-11, and EW-1. MTBE was not detected at or above the laboratory <br /> reported detection limit of 0.5 µg/L in the groundwater samples collected from MW-2, MW-3, MW-4R, <br /> MW-6, MW-7,MW-8, and MW-10. <br /> DISCUSSION AND RECOMMENDATIONS <br /> Laboratory analytical results for the groundwater samples collected from the site monitoring wells on <br /> March 27, 2006, indicate that MTBE was detected at a concentration below the California Department of <br /> Health Services Primary Maximum Contaminant Level (MCL) of 13 µg/L in the groundwater sample <br /> collected from MW-9, and above the MCL in the groundwater samples collected from MW-11 and EW-1. <br /> �1� CONDOR <br />