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Tat Page of 31 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Dr,Stockton,Cahtomia Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness, Elevation Elevation change TPH G Benzene Toluene Ethylbenzene Xylenes MtBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mg/1 BHD-1 3/18/96 938 -- -880 432 4,200 99 28 360 320 - (cont) 6/18196 950 -- -892 -012 5,500 82 <10 430 300 <100 9/25196 1180 -1122 -230 4,600 75 55 280 160 <50 1214196 11 50 -- -1092 030 4,500 83 11 350 220 <50 3/19/97 P 7 02 -644 448 2,300 54 <10 190 100 - 01 6/5/97 NP 838 -- -780 -136 3,500 39 3 76 12 170 02 8/19/97 NP 998 - -940 -160 440 7 9 0 94 <0 5 <0 5 360 0 2 11/25/97 NP 1042 -- -984 -044 1,300 28 0 85 7 9 2 8 220 3120/98 P 445 -- -387 597 490 34 3 37 24 210 5 4 6/24/98 P 592 -534 -147 5,500 37 <10 170 46 580 3 0 9/10198 NP 812 -- -754 -220 349 3 19 <0 500 0 542 <0 500 567 12/17/98 P 770 - -712 0 42 1,000 25 2 <1 0 109 368 627 - 3110/99 P 655 -- -597 1 15 432 102 <0 500 1 59 17 3 263 2 3 6/22/99 NP 813 -- -7 55 -158 162 <0 5 <0 5 <0 5 <0 5 728 0 8 9/13199 NP 928 - -870 1 15 420 <0 5 <0 5 0 956 <0 5 1 410 1 2 12/16/99 - Well Box Inaccessible -- - - -- - -- - 3/23/00 P 465 -4 07 -- 559 <0 5 <0 5 137 0 627 <2 5 0 9 6/21100 P 642 -- -584 -177 895 133 <0 5 <0 5 <0 5 175 0 1 9/13100 NP 837 - -779 -195 176 498 0 806 1 10 1 17 1,010 20 12/15/00 P 793 -- -735 044 <50 0 <0 500 <0 500 <0 500 <0 500 505 073 3/2/01 Well Inaccessible BHD 2 8/26188 073 - -- -- -- - - 11/28/88 - -- " - - 2/27189 -. - - - 5/30/89 -- -- - - - 8/22/89 -- -- -- - <0 5 <0 5 <0 5 <0 5 12/4189 - -- '- - - - 1/4/90 1622 -- -1549 -- . 2/1/90 - -- - -- 2/15190 -- -- . 2/22/90 -- -- -- -- - - 3/8/90 1578 -1505 -- <0 5 <0 5 <0 5 <0 5 415/90 1585 1512 -007 -- - -- 4119l90 1592 - -1519 -007 - 5/10/90 1657 -- -1584 -065 5/24/90 1654 -1581 003 -