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ATTACHMENT <br /> TABLE 4.2 <br /> HISTORICAL GROUNDWATER MONITORING DATA AND ANALYTICAL RESULTS <br /> BEGINNING DECEMBER 1,2010 <br /> Former Texaco Service Station <br /> Chevron Site 11)309075 <br /> 3978 South Highway 99 <br /> Stockton,California <br /> MTBE TBA DIPE ETBE TAME 1,2-DCA EDB Ethanol Methanol <br /> Well ID Dab (P91L) (g►L) (P91L) IMP (g/L) (Ig/L) (P91L) (g/L) (Ng/L) <br /> MW-1 12/1/2010 <0.5 20 <0.5 <0.5 <0.5 100 <0.5 <50 <200 <br /> 4(712011 <0.5 10 <0.5 <0.5 <0.5 660 <0.5 <50 <200 t` <br /> 10/14/2011 <0.5 16 <0.5 <0.5 <0.5 200 <0.5 <50 <200 <br /> I <br /> MW-2 12/1/2010 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 4(7/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 10/14/2011 <0.5 <2 1 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> MW-3 12/1/2010 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 4!7/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <60 <200 <br /> 10/14/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> MW-4 12/1/2010 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 4/7/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 10/14/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 260 <br /> MWS 12/1/2010 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 4/7/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 10/14/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> MW-6 12/1/2010 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 47/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 10/14/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> MW-6D 12/1/2010 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 4/7/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> 10/14/2011 <0.5 <2 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <200 <br /> Nobs: <br /> MTBE Methyl tertiary butyl ether. <br /> TBA Tertiary butyl alcohol. <br /> DIPE DWsopropyl ether. <br /> ETBE Ethyl tertiary butyl ether. <br /> TAME Tertiary amyl methyl ether. <br /> 1,2-DCA 1,2-dicholoroethane. <br /> EDB Ethylene dibromide,also known as 1,2-dibromoethane. <br /> K& Microgram per liter. <br /> < Not detected at or above the laboratory method detection limit shown. <br /> G:%ProJedlENV%CHEVR0M3M7516 DelverableslPerWc Monitodng\201112SA111TempPDFlAttachmerft%ttachment F-Table 4.xlsx 1 Of 1 <br /> I <br />