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<br /> iGroundwater Monstorin to and Analytical Results
<br /> Former Tosco(Unocal)Service Station#6981
<br /> 4707 Pacific Avenue
<br /> Stockton,California
<br /> WELL ID/ DATE DTW S.I. GWE TPH-G B T E X MTBE
<br /> TOC"'(A) (ft) (ftbgs) (ft) (ppb) (PPB) (ppb) (ppb) (ppb) (ppb)
<br /> 07/21/98 2853 2,5009 97 <0 50 <0 50 57 <5 0/<2 06
<br /> 10/14/98 2954 -- 14,0009 <50 <50 120 370 <250/<666
<br /> 01125-26199 2874 20,00012 <50 100 <50 440 <250/156
<br /> 04/19-20/99 2623 -- 14,000 <50 <50 82 170 <250/15'
<br /> 07/15-16199 2754 -- 17,000 <50 <50 <50 <50 <250/196
<br /> 10/25-26199 2936 -- 22,00013 <50 <50 70 290 <250/276
<br /> 01/27-28/00 2885 -- 19,00013 66 <50 190 1,300 431516
<br /> 06/26-27/00 2609 -- 3,47014 <5 00 <5 00 <5 00 43 2 683/1,1106
<br /> 1176 09/22-23/00 2865 -1689 12,00013 <100 <100 <100 200 2,800/1606
<br /> 12/26-27/00 2858 -1682 11,10014 <12 5 <12 5 275 167 140/1726
<br /> 03/07-08/01 2827 -1651 12,70014 128 <100 794 413 350/3216
<br /> 06/26-27101 2932 -1756 17,00014 <20 <20 27 170 230/3306
<br /> 09/12-13/01 31 20 -1944 6,90014 88 <5 0 62 230 240/3106
<br /> 12/12-13101 3147 -1971 7,00014 24 <10 200 64 220/2706
<br /> 03120-21/02 3021 -1845 17014 <0 50 <0 50 <0 50 24 27/366
<br /> 06/06-07/0217 3067 -1891 <50 <0 50 <0 50 050 39 --/406
<br /> 09/30/02 DRY -- -- -- --
<br /> VW-4 12130-31102 DRY 25 5-505 -- -- -- -- -- -- --
<br /> (cont) 03129-30103'8 3174 -1998 <50 <0 50 <0 50 <0 50 <1 0 <2 0
<br /> 06125-26/03 3208 -2032 NOT SAMPLED DUE TO INSUFFICIENT WATER -- --
<br /> VW-7
<br /> NA 08/21/99 2857 55 0-60 0 -- 37,000 2,500 6,100 610 7,000 <250/5106
<br /> 10/25-26/99 2954 33,00013 2,900 6,800 680 7,800 <500/4 76
<br /> 01/27-28/00 2902 -- 23,00013 2,000 5,600 860 9,900 1201756
<br /> 06126-27/00 2627 28,700" 1,560 3,800 <50 0 8,310 <500/41 46
<br /> 1167 09/22-23100 2843 -1676 8,50013 610 2,200 12 4,900 3001356
<br /> 12/26-27100 2834 -1667 37,90013 I,420 3,330 328 10,000 <500/<1006
<br /> 03/07-08/01 2803 -1636 34,40013 853 2,750 394 8,900 <500/<40 06
<br /> 06126-27/01 2908 -1741 31,00013 660 2,100 150 7,900 <500/<506
<br /> 09/12-13101 3094 -1927 34,00014 870 1,800 780 7,900 <l,0oo/<506
<br /> 6981 xis/#180138 23 As of 06/26/03
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