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TABLE 2-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING USING EPA METHOD 8260 ANALYSIS BP OIL COMPANY SERVICE STATION NO.11195 16500 SOUTH INTERSTATE 5,LATHROP,CALIFORNIA ALISTO PROJECT NO.10-151 WELL DATE OF B T E x MTBE DIPE ETBE TBA TAME LAB ID SAMPLING/ (ugll) (ug/1) (ugA) (ugA) (u0/1) (ug/1) (ugA) (ugA) (ugll) MONITORING i MW-1 05/07/98 ND<5 ND<5 ND<5 ND<5 2900 ND<10 ND<10 ND<50o ND<10 SPL MW-1 09/03/98 --- -- 15000 ND<10 ND<10 ND<500 89 SPL MW-2 05/07/98 ND<5 ND<5 ND<5 ND<5 93000 ND<lo ND<10 ND<500 470 SPL MW-2 09/03/98 -- — --- 37000 ND<W ND<10 ND<500 190 SPL MW-3 05/07/98 6 ND<5 240 380 50000 ND<10 ND<10 ND<5W 210 SPL OC-1 (e) 05107!98 5 ND<5 250 380 50000 ND<10 ND<10 ND<500 220 SPL MW-3 09/03/98 -- -- --- --- 82000 ND<10 ND<10 ND<500 710 SPL MW-4 05/07/98 ND<5 ND<5 15 ND<5 880 ND<10 ND<10 ND<500 ND<10 SPL MW-4 09!03!98 -- ... --- — 1100 ND<10 ND<lo ND<500 ND<10 SPL MW-5 05/07/98 ND<5 ND<5 ND<5 ND<5 5400 ND<10 ND<10 ND<500 ND<10 SPL MW-5 09/03/96 --- -- — ... 6800 ND<10 ND<lo ND<500 53 SPL MW-6 05/07/98 ND<5 ND<5 ND<5 ND<5 1800 ND<10 ND<10 ND<500 ND<10 SPL MW-6 09/03198 — -- — 23 ND<10 ND<10 ND<500 ND<10 SPL 09103/98 --- -- 23 ND<l0 ND<10 ND<500 ND<10 SPL i MW-9 09/03/98 --- — — --- ND<10 ND<10 ND<10 ND<500 ND<10 SPL r 09/03/98 — --- --- — 270 ND<10 ND<10 ND<500 ND<10 SPL MW-11 09/03/98 ... -- ND<10 ND<10 ND<lo ND<500 ND<10 SPL MW-12 09/03/98 --- --- ND<10 ND<10 ND<10 ND<500 ND<10 SPL ABBREVIATIONS: B Benzene T Toluene E Ethylbenzene x Total xylenes MTBE Methyl lert butyl ether DIPE Di-isopropyl ether ETBE Ethyl t-butyl ether TBA I-butyl ether TAME tert-amyl melhyl ether ugA Micrograms per liter NO Not detected above reported detection rimil SPL Southern Petroleum Laboratories F%1\1 0-1 51\1 0.151 EC.W02 17-Nov-98 Page 1