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Page 1 of 3 Table 1 Groundwater Elevation and Analytical Data t Former ARCO Service Station/!4493 205 N Center St,Stockton,CA Ethyl- Ethyl- Xylenes Xylenes Well Depth Groundwater Groundwater Benzene Benzene Toluene Toluene benzene benzene (total) (total) MtBE ME Well Date Eievaton to Water Elevation Elevabon TPHg (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (8020) (8260) DO Number Sampled (ft,MSL) (ft,TOC) (tt,MSL) Change(M (ppb) (DHS LUFT) (8260) (DHS LUFT) (8260) (DHS LUFT) (8260) (DHS LUED (8260) (ppb) (ppb) (nig/L) MW-1 2/16/99 11 94 1335 -141 -- 231 1 35 -- NO — 2 37 — NO — ND — 3110199 13 01 -1 07 0 34 — — — -- — -- — — 6117/99 11 89 0 05 1 12 <50 3 52 — <0 5 — <0 5 — 302 — <2 0 -- 9124/99 Well inaccessible 12/16/99 NP 1439 -2 45 — <50 235 — <0 5 -- <0 5 — 302 <2 50 — 2 9 3/28/00 P 1212 -018 227 132 0 864 — <0 5 — <0 5 — <0 5 — <2 50 — 182 6119/00 P 11 63 0 31 049 <50 0 692 -- <0 500 — <0 500 — <0 500 — 206 <2 0 3 77 9/19/00 P 1244 -0 50 -081 78 2 5 21 — <0 500 — <0 500 — <0 500 — <2 50 <2 0 1 5 11/30/00 P 1362 -1 68 -1 18 909 0 698 — <0 500 -- <0 500 — <0 500 2 8 — <2 00 062 9113101 P 11 64 0 30 1 98 140 2 5 <2 0 <0 50 <2 0 <0 50 <2 0 <0 50 <2 0 — <2 0 1 72 12131101' P 1085 1 09 0 79 <50 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 -- <0 50 — 3/13/02 P 1388 -194 -303 <50 0 61 062 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 — 0 71 1 13 MW-2 2116/99 1243 1456 -213 -- ND ND NO NO NO ND NO ND NO ND — — 3/10199 1370 -127 086 -- — — — — — — - 6/17/99 1252 -0 09 1 18 <50 <05 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <2 0 -- -- 9/24/99 NP 1224 019 0 28 <50 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <50 — 4 2 12/16/99 NP 1529 -2 86 -305 <50 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <2 50 -- 4 3 3128100 P 12 95 -052 234 522 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 1 22 1 22 <2 50 — 288 6119100 P 12 57 -014 0 38 <50 <0 500 <0 500 <0 500 <0 500 <0 500 <0 500 <0 500 <0 500 <2 50 <2 0 212 9119/00 P 12 33 010 024 <50 <0 500 <0 500 <0 500 <0 500 0 514 0 514 <0 500 <0 500 <2 50 <2 0 1 8 11/30/00 P 1460 -217 -227 138 <0 500 <0 500 <0 500 <0 500 <0 500 <0 500 <0 500 <0 500 — <2 00 1 58 9/13/01 P 1268 -025 1 92 100 <0 50 <2 0 <0 50 <2 0 <0 50 <2 0 <0 50 <2 0 — <2 0 1 09 12131/01' P 1325 -082 -0 57 83` <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 — 1 6 — 3113/02 P 1573 -330 -2 48 <50 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 — 51 226 I MW-3 2/16(99 1251 14 64 -213 — NO ND — ND — ND — ND — 706 — -- 3/10/99 13 99 -1 48 0 65 — -- _ _ — - 6/17199 1297 -046 102 <50 <0 5 — <0 5 — <0 5 — 2 26 — 144 — — 9/24/99 Well inaccessible 12/16/99 NP 1553 -302 — <50 <0 5 — <0 5 — <05 — <0 5 — <2 50 — 41 3/28/00 P 1321 -0 7 232 <50 <0 5 -- <0 5 — <0 5 — <0 5 — 246 — 2 24 6/19/00 P 1279 -0 28 042 <50 <0 500 — <0 500 — <0 500 — <0 500 — 278 260 198 9/19/00 P 1371 -120 -0 92 75 7 0 512 -- <0 500 — <0 500 — <0 500 -- 254 241 0 9 11/30/00 P 1487 -236 -1 16 811 0 674 — <0 500 — <0 500 -- 1 15 -- -- 195 0 76 9/13101 P Well filled with dirt 12/31/01 P 1325 -074 -- 1,900` 60 39 8 7 <10 <50 14 30 17 — 150 — 3113/02 P 1661 -410 -336 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 — 1 0 1 08 Pro)ecWARCO/4493/ReportsiTables/gwtables4493xls