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i <br /> Fourth Quarter 2005 Groundwater Monitoring Report <br /> Boyett Petroleum,419 S.Main,Manteca,CA <br /> Page 3 <br /> . tertiary-butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl <br /> ether(TAME), 1,2-dichloroethane(1,2-DCA), and 1,2-dibromoethane(EDB). <br /> The laboratory analytical results for the fourth quarter 2005 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 A alytical Results ecember 28 2005 <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: µg/L µg/L pg/L µg/L mg/L pg/L µg/L <br /> Analytical Method: 8260B 8260E 8260B 8260B 8015M 8260B 8260B <br /> Sample I.D. Well I.D. <br /> MW-2 MW-2 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-3 MW-3 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW4R MW-4R <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0- <br /> MW-6 MW-6 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-7 MW-7 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-8 MW-8 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> • MW-9 MW-9 <0.5 <0.5 <0.5 <1.0 <0.05 0.9 <0.5-<5.0 <br /> MW-10 MW-10 <0.5 <0.5 <0.5 <1.0 <0.05 0.8 <0.5-<5.0 <br /> MW-11 MW-11 <0.5 <0.5 <0.5 <1.0 <0.05 91 <0.5-<5.0 <br /> EW-1 EW-1 <0.5 <0.5 <0.5 <1.0 1 <0.05 25 <0.5-<5.0 <br /> Unit Cgnversions: 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 oxygenatesladditives=ethanol(EtOH),tertiary-butanol(TBA),di-isopropyl ether(DIPS), <br /> ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl ether(TAME), i,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-10, MW-11, and EW-1. MTBE was not detected at or above the <br /> laboratory reported detection limit of 0.5 µg/L in the groundwater samples collected from MW-2, MW-3, <br /> MW-4R, MW-6, MW-7, and MW-8. <br /> DISCUSSION AND RECOMMENDATIONS <br /> Laboratory analytical results for the groundwater samples collected from the site monitoring wells on <br /> nn nnnc -�:_�. ♦L F A Vrnu ,7..a.•..a-A �,s +.�+;r.,o t,ol.,.s.fl,n f'ei;4nr.�;o TlPn�rfmanf <br /> JJL'.{.:G111UG1 LU, LVVJ, LL1111lialV W1GL�1111 LL lwa:; YV�VV4V�+ua VV++V vaaw ueavaw vvlc rr •++v �+.+•+ice•+.+.+++��+.•••...�... <br /> of Health Services Primary Maximum Contaminant Level (MCL) of 13 µg/L in the groundwater samples <br /> 0 <br /> A %4t'. <br /> �s1� CONDOR <br />