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r Ir Page 28 of 35 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Dr,Stockton,CA II Well Depth Product Groundwater Groundwater Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene Ethylbenzene (total) ME DO Number Sampled (ft,MSL) (ft,TOG) lift,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (m9/L) BHD-1 3121194 1436 - -1378 0 87 8,600 83 14 480 360 (cont) 6127194 1430 -- -13 72 006 9,600 110 32 490 420 9129194 1546 -- -1488 1 16 7,200 170 12 460 340 -- 1218194 1499 -- -14 49 047 8,200 160 14 560 640 3/8/95 1281 -- -12 23 218 6,000 84 6 2 300 97 611/95 1129 -- -10 71 1 52 7,100 97 <5 370 250 - -- 9/11195 1321 -- -1263 -192 5,600 110 6 340 270 -- 12/5/95 1370 - -1312 -049 9,200 74 <10 470 410 - 3/18196 938 -- -8801 432 4,200 99 28 360 320 - 6/18/96 950 -8 92� 012 5,500 82 <10 430 300 <100 - 9/25196 1180 -- -1122 -2 30 4,600 75 5 5 280 160 <50 ` 121"6 1150 -1092 030 4,500 83 11 350 220 <50 -- 3/19/97 P 702 -6 44 448 2,300 54 <10 190 100 01 6/5197 NP 838 -- -7 8t7 -136 3,500 39 3 76 12 170 0 2 8119197 NP 998 -- -9 40 -160 440 7 9 0 94 <0 5 <0 5 360 02 11/25/97 NP 1042 - -9 84� -044 1,300 2 8 085 79 2 8 220 3120/98 P 44.5 -387 5 97 490 34 3 37 24 210 5 4 6/24/98 P 5 92 — -5341 -147 5,500 37 <10 170 46 580 30 9110/98 NP 812 -7541 -220 349 319 <0 500 0 542 <0 500 567 12/17/98 P 770 — -7121 042 1,000 252 <1 0 109 368 627 3110199 P 655 -- -597 1 15 432 102 <0 500 159 173 263 23 6127!99 NP 813 -- -756 -158 162 <0 5 <0 5 <0 5 <0 5 728 08 9/13199 NP 928 -- -870 -1 15 420 <0 5 <0 5 0 956 <0 5 1,410 1 2 12/16/98 Well box inaccessible 3/23100 P 465 -407 -- 559 <05 <0 5 137 0 627 <2 5 0 9 6121100 P 642 -- " -584 -1 77 89 5 133 <0 5 <0 5 <0 5 175 01 9/13/00 NP 837 -779 -195 176 4 98 0 806 1 10 1 17 1,010 20 12/15/00 P 7 93 -- -735 044 <50 0 <0 500 <0 500 <0 500 <0 500 505 0 73 3/2101 Well inaccessible 5/10/01 P 583 - -525 101 0 788 <0 500 133 125 639 14 8122/01 P 8 63 -- -805 -2 80 <500 <5 0 <5 0 <50 <5 0 850 1215101 P 808 -- -750 055 <500 <5 0 <5 0 <5 0 <5 0 470 184 3112102 P 605 - -547 203 <500 <5 0 <5 0 <5 0 <50 430 093 6/W02 P 703 — -645 -098 95• <0 50 <0 50 <0 50 <0 50 170 022 Projects&/2133/Reports/Tablesl - gwtabies2133 xis i .