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1 <br /> • Petroleum Hydrocarbons as diesel (TPHd), Total Petroleum Hydrocarbons as gasoline <br /> 1 (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 Kiff Analytical of Davis, California, a Department of Health Services <br /> (DHS)-certified laboratory <br /> 30 LABORATORY ANALYTICAL RESULTS <br /> 1 <br /> The highest detection of MTBE encountered was 2,800 ppb found in groundwater <br /> monitoring well MW-1 located in the former tank farm excavation The second highest <br /> detection was in MW-2, located northeast of the former tank pit on the northern <br /> boundary of the subject property The level of MTBE found in MW-2 was 290 ppb <br /> 1 Tert-butanol and TAME were also detected in wells MW-3 and MW-2 Diesel was <br /> detected in four of the six monitoring wells, however, Kiff Analytical indicated that the <br /> detection of diesel MW-2 and MW-3 do not fit the typical chromatograph pattern of <br /> diesel fuels The following table shows the detections in this last monitoring event and <br /> the previous monitoring event <br /> 1 <br /> TABLE I <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS <br /> TOTAL PETROLEUM HYDROCARBONS BTEX and MTBE <br /> • ALL RESULTS ARE IN ug/L <br /> 1 <br /> MonHwing Dale TOTAL PETROLEUM AROMATIC VOLATILE ORCANK AND OXYGEA MATES <br /> well CD 1poed HYDROCARBONS <br /> GASOLINE UIESEL BENZENE TOLUENE ETkiYi XYLENE TAME TertAurand MTBE 1 Z DCA and EDB <br /> BENZENE <br /> FT200 440 120 31 ND 051 L11 16 170 240 ND <br /> 00 NO NO ND NO ND NO 2 S 61 0 2 8Q0 NO <br /> MW-2 2/12/00 ND ND ND ND ND ND 15 0 130 1,800 ND <br /> 4!28100 ND 64 ND ND ND ND 16 84 290 ND <br /> MW 3 2112100 NO ND ND ND ND ND ND ND 1 6 ND <br /> 1 <br /> 4128100 NO 140 NO NO NO NO NO NO 4 3 ND <br /> MW-4 2112/00 ND ND ND ND ND ND ND NO 3 8 ND <br /> 4!28/00 NO 960 ND NO ND NO ND ND 39 NO <br /> MW-5 2112100 ND ND ND ND ND ND ND ND ND ND <br /> 1 4/28!00 NO ND ND NO ND ND NO ND ND ND <br /> MW-I5 2/12/00 ND ND ND ND ND ND ND ND ND ND <br /> 4!28100 NO NO NO NO NO NO ND NO NO NO <br /> Note ND — Not Defected at Method Detection Limits <br /> NA — Not Analyzed <br /> Detection Limits EPA Method 8020 varies most are — 5 0 ppb <br /> • EPA Method 8015 — 0 5 mg/kg or 500 ppb <br /> YWAvalon Environmental Consultants Protect# 9627-001-3 <br /> )oes Truck Plaza 15600 South Harlan Road <br /> May 20, 2000 2 Lathrop, California <br />