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ar y <br /> Fourth Quarter 2004 Groundwater Monitoring Report <br /> Boyett Petroleum,419 S.Main,Manteca,CA <br /> Page 4 <br /> Table 3: LaboratoryAnal tical Results (December 29, 2004) <br /> Other <br /> 13 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: }tg/L µg/L pg/L pg/L mg/L pg/L µg/L <br /> Analytical Method: 8260E 8260B 8260B 8260E 8015M 8260B 8260B <br /> Sample I.D. Well T.D. <br /> 3761C-MW2-12/29/04 MW-2 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 3761C-MW3-12/29/04 MW-3 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 3761C-MW4R-12/29104 MW4R <0.5 <0.5 <0.5 <1.0 <0.05 11 <0.5-5.0 <br /> 3761C-MW6-12/29/04 MW-6 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 3761GMW7-12/29/04 MW-7 <05 <0.5 <0.5 <1.0 <0.05 310 <0.5--5.0 <br /> 3761C-MW8-12/29104 MW-8 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 <br /> 37610-MW9-12/29/04 MW-9 <0.5 <0.5 <0.5 <1.0 1 <0.05 0.7 <0.5-5.0 <br /> 37610-MW 10-12/29/04 MW-10 <0.5 <0.5 <0.5 <1.0 <0.05 15 <0.5-5.0 <br /> 3761C-MW11-12/29/04 MW-1 I <0.5 1 <0.5 <0.5 <1.0 <0.05 1 420 <0.5-5.0 <br /> 3761C-EW I-12/29/04 EW-I <0.5 1 <0.5 <0.5 <1.0 <0.05 58 1 <0.5-5.0 <br /> • UnitConversions: Anal ical <br /> pp/L:parts per billion(ppb). BTEX=benzene,toluene,ethyl benzene,and total xylenes. <br /> mg/L:parts per million(ppm). TPH-C,=total petroleum hydrocarbons,quantified as gasoline. <br /> MTBE=methyl tertiary-butyl ether. <br /> Other oxygenates/additives=ethanol(EtOH),tertiary-butanol(TSA),di-isopropyl ether(D1PE), <br /> ethyl tertiary-butyl ether(ETRE),tertiary-amy! methyl ether(TAME), 1,2-dichloromethane (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-4R, MW-7, MW-9, MW-10, MW-11, and EW-1. MTBE was not detected at <br /> or above the laboratory reported detection limit of 0.5 iig/L in the groundwater samples collected from <br /> MW-2, MW-3, MW-6, and MW-8. <br /> RECOMMENDATIONS <br /> Condor recommends continuation of quarterly groundwater monitoring at the Site. <br /> LIMITATIONS <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 /> skill ordinarily used by a member of the environmental profession practicing under similar conditions at <br /> the same time in the same locality. Condor is not responsible for the accuracy and completeness of <br /> information collected and developed by others. <br /> +i1� CONDOR <br />