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Ta •Groundwater Analytical R Oxygenate Compounds <br /> Tosco(Circle K)Unit#01205 <br /> 16470 Cambridge Street <br /> Lathrop,California <br /> WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETBE TAME 1,2-DCA EDR <br /> (ppb) (ppb) (ppb) (PPb) (PPb) (Ppb) (Ppb) (Ppb) (111 10 <br /> MW-1 10/08/98 7,100 ND' 320 3,400 NDE ND' 22 <br /> 07/16199 -- ND' ND' 820 ND' NDND' <br /> 10/21/99 -- ND 250 ND ND ND -- -- <br /> 01/31/00 -- -- 440 2,200 ND ND 89 -- -- <br /> 04/10/00 ND' ND' 186 ND' ND' ND' <br /> 07/05/00 -- -- ND' NDE ND' ND' ND' <br /> 10/20/00 -- - ND 30 ND ND ND -01/08/01 -- ND ND 29 ND ND ND ND ND <br /> 04/26/01 -- NDE ND' 606 ND' ND' ND' ND' ND' <br /> 07/19/01 -- ND' ND' ND' ND' ND' ND' ND' ND' <br /> 10/25/01 -- <10,000 <400 <20 <20 <20 <20 <20 <20 <br /> 01/29/02 -- <5,000 <1,000 <20 <20 <20 <20 <20 <20 <br /> 04/29/02 - <2,500 <500 <10 <10 <10 <10 <10 <10 <br /> 07/29/02 -- <100,000 <20,000 <400 <400 <400 <400 <400 <400 <br /> MW-2 10/08/98 6,800 ND' 620 4,000 ND' ND' 76 -- -- <br /> 07/16/99 -- ND' ND' 560 ND' ND' ND' -- -- <br /> 10121/99 - -- ND 71 ND ND ND -- - <br /> 01/31/00 -- - 2,400 9,800 ND ND ND -- <br /> 04/10/00 -- ND' NDE 532 ND' ND' ND' - -- <br /> 07/05/00 - -- ND' 237 NO ND' ND' - -- <br /> 10/20/00 -- -- ND 44 ND ND ND -- -- <br /> 01/08/01 -- ND ND 28 ND ND ND ND ND <br /> 04/26/01 -- ND' ND' 367 NDE ND' ND' ND' ND' <br /> 07/19/01 -- ND ND 76 ND ND ND ND ND <br /> i <br /> 10/25/01 -- <500 25 24 <10 <10 <10 <10 <10 <br /> 01/29/02 -- <500 <100 53 <20 <2 0 <2 0 <2 0 <2 <br /> 04/29/02 - <500 110 62 <2 0 <2 0 <2 0 <2 0 <20 <br /> 07/29/02 -- <500 <100 26 <20 <20 <2 0 <2 0 <20 <br /> i <br /> 01205 x10180183 7 As of 07/29/02 <br />