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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL1171 DATE DTW ST GWE TPH-O B T E X MTBE POC*(ft) ON. (ft bo (ppb)__ (Ppb) (Ppb) (Ppb) (Ppb) (ppb) VW-1 01125-26199 2819 24 5-49 5 -- <50 <0 50 <0 50 <0 50 <0 50 <2 512 56 (cont) 04/19-20/99 2576 -- <50 <0 50 <0 50 <0 50 <0'1 50 5 213 0� 07/15-16199 2709 -- <50 <0 50 <0 50 <0 50 <6'50 <2 5/<2 06 10125-26/99 2875 -- <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0' 01/27-28/00 2829 -- <50 095 <0 50 <0 50 0'63 10/4 6's 06126-27100 2147 -- <50 0 <0 500 1 13 <0 500 128 <5 00/2 776 1090 09122-23/00 2743 -1653 <50 <0 50 <0 50 <0 50 <0 50 87169" 12/26-27100 2743 -1653 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 00� 03/07-08/01 2718 -1628 <50 0 <0 500 <0 500 <0 500 <0 500 <5 001<2 006 1 06126-27/01 2806 -1716 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 0'` 09112-13101 3001 -1911 <50 <0 50 <0 50 <0 50 <0 X50 <5 0/<2 e 1 12/12-13/01 3032 -1942 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<10'1 i VW-2 NA 07/24/96 3867 25 5-505 -- 78,000 510 3,100 540 24,000 720/560' 10/15/96 DRY -- -- - -- -- -- -- -- SAMPLED SEMI-ANNUALLY -- -- -- 10/23/96 -- -- 01/20/97 3707 -- NOT SAMPLED DUE TO INSUFFICIENT WATER -- -- 07/16/97 DRY -- -- -- -- -- -- - 12/08/97 WELL CONNECTED TO VES -- -- -- -- -` 03/05/98 DRY -- -- -- "" -- -" 05/27/98 DRY -- -- -- -- -- -- 07/21/98 DRY -- -- -- -- "" 10/14/98 DRY -- -- -- -- "" - 01/25-26199 DRY 04119-20199 2634 -- 3,400 <10 <10 <10 53 781496 07/15-16199 2779 -- NOT SAMPLED DUE TO INSUFFICIENT WATER - -- 10/25-26/99 DRY -- -- - -- -- -- 01/27-28/00 DRY -- -- -- -- -- '- 06/26-27/00 2617 1,94014 <2 50 358 614 51118 360/486's 71 1166 09122-23100 DRY -- - -- -- �- -- 6981 xis/ T80138 0 A&13/01