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1 <br /> iPetroleum Hydrocarbons as diesel (TPHd), Total Petroleum Hydrocarbons as gasoline <br /> (TPHg), Benzene, Toluene, Ethyl benzene and Xylene (BTEX), Lead scavengers (1,2- <br /> DCA and EDB), and Oxygenates including Ethanol and Methanol Samples were <br /> analyzed by Klff Analytical of Davis, California, a Department of Health Services <br /> (DHS)-certified laboratory <br /> 3.0 LABORATORY ANALYTICAL RESULTS <br /> 1 ' <br /> The highest detection of MTBE encountered was 980 ppb found In MW-2, located <br /> northeast of the former tank pit on the northern boundary of the subject property The <br /> second highest detection of MTBE was 160 ppb found In groundwater monitoring well <br /> MW-1 located in the former tank farm excavation Tert-butanol and TAME were also <br /> 1 detected in wells MW-1 and MW-2 The following table shows the detections In this <br /> monitoring event and the previous monitoring events Ethanol at 5 1 ppb and <br /> Methanol at 470 ppb were detected In two of the wells MW-3 and MW-4, respectively <br /> The source of these detections Is not known at this time <br /> 1 TABLE I <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS <br /> TOTAL PETROLEUM HYDROCARBONS BTEX and MTBE <br /> II ALL RESULTS ARE IN ug/L <br /> Mautonng [lata TOTAL PETRpLEUM AA MATIC VOLATILE ORGANIC AND OXYMNATES <br /> well Collected FtYOROCAELMNS <br /> GASOLINE DIESEL BENZENE TOLUENE ETHYL XYLENE TAME Ted Butanol ABBE F 2 nCA <br /> BENZFNE Ethanal and EDB <br /> MMhanol <br /> MW-1 2/12/00 440 120 31 NO 051 110 1 6 170 240 NO <br /> 4/28/00 NO NO NO NO NO NO 2 S 610 2,800 ND <br /> 9/20/00 NO ND ND ND ND ND 10 16 160 ND <br /> ,MW-2 2/12/00 NO NO ND ND NO NO 150 130 1,800 NO <br /> 4128/00 NO 64 ND ND NO NO 16 84 290 NO <br />` 9120!00 NO ND ND NO ND NO 73 28 980 ND <br /> MW-3 2/12/00 NO NO NO ND NO NO NO NO 16 NO <br /> 4128/00 ND 140 ND ND NO NO ND NO 43 NO <br /> 9/20/00 NO ND ND ND ND ND ND ND 15 ND <br /> Ethanol 5.1 <br /> I! MWA 2/12100 ND ND ND NO ND NO ND NO 38 NO <br /> 4/28/00 NO 960 ND NO ND NO ND NO 39 NO <br /> 9120/00 NO ND ND ND ND ND ND ND i 1 ND <br /> Methanol 470 <br /> MW-52112100 NO NO ND NO NO NO NO NO NO NO <br /> I •� 4128/00 NO NO NO ND NO NO NO NO NO NO <br /> Avalon Environmental Consultants Project 4 9627-001-4 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> October 11, 2000 2 Lathrop, California <br /> I <br />