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Page 2 of 3 Table 1 Groundwater Elevation and Analytical Data — 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 MtBE Well Date Elevabon to Water Elevation Elevation TPHg (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (8020) (8260) DO Number Sampled ft,MSL ft,TOG) ft,MSL) Change(ft) (ppb) DHS LU 8260 DHS LU 8260 DHS LU 8260} DHS LUFT) (8260) (ppb) (ppb) (mg/-) MW-4 2/16/99 1219 1441 -2 22 — 15,000 503 — ND — 707 — 1,550 — 9,990 — - 310199 1361 -1 42 0 8 — — — — — — 6117199 1243 -024 118 10,800 230 — 177 -- 597 — 936 -- 766 — 9/24/99 N P 1272 -0 53 -0 29 4.880 173 -- <100 — 262 -- <10 — 670 — 4 9 12/16/99 N P 1517 -296 -2 45 7,830 260 — <100 -- 570 — 113 -- 1,310 — 1 9 3128100 P 1283 -064 2 34 5,330 298 — <20 0 — 318 — 443 -- 4,960 — 100 6119100 P 1244 -025 0 39 2,860 186 — <20 0 — 223 — 123 -- 3,790 <2 0 382 9119/00 P 1332 -1 13 -088 3,460 234 — <100 — 300 — 150 — 2,210 1,710 0 8 11/30/00 P 1444 -225 -1 12 3,640 219 177 <5 00 <5 00 499 389 39 0 270 — 427 0 73 9/13101 P 1226 -007 218 1,600 110 79 <10 <20 21 <20 11 24 — 680 072 12/31/01 P 1260 -0 41 -0 34 <50 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 — <0 50 — 3/13102 P 1826 -407 -366 960 27 15 <5 0 0 96 <5 0 3 5 <5 0 47 — 120 098 MW-5 6/19100 P 1203 1298 -0 95 — <50 275 — <0 500 — <0 500 — <0 500 — <2 50 <2 0 2 09 9/19/00 P 1365 -162 -067 <50 119 — <0 500 — <0 500 — <0 500 — <2 50 <2 0 0 6 11/30/00 P 1488 -2 85 -123 <50 0 0 694 — <0 500 — <0 500 — <0 500 — — <2 00 1 21 9113101 P 1598 -395 -1 10 <50 <0 50 <20 <0 50 <2 0 <0 50 <2 0 <0 50 <2 0 — <2 0 088 12/31/01 P NS — — — 54` 7 21 5 9 <0 50 <1 0 1 5 1 <0 50 <1 0 — 60 -- 3/13/02 P NS 1878 — — 370 32 27 067 0 51 39 40 31 2 4 — 200 046 MW-6 6/19100 P 1326 1381 -0 55 -- <50 1 87 — <0 500 — 0 523 — 234 — 171 144 1 83 9119/00 P 1456 -130 -075 <50 130 -- <0 500 — <0 500 — <0 500 — 119 102 0 7 11/30/00 P 1579 -253 -123 <50 0 <0 500 <0 500 <0 500 208 <0 500 <0 500 <0 500 800 — 412 064 9113101 P 1360 -0 34 219 <50 <0 50 <20 <0 50 <2 0 <0 50 <2 0 <0 50 <2 0 — <2 0 078 j 12/31/01 P 1463 -137 103 <50 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 <0 50 <1 0 -- <0 50 — 3/13/02 P 1681 -355 -218 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -CO 50 — 0 66 — MW-7 6/19/00 P 1107 1187 -0 80 — <50 <0 500 — <0 500 — <0 500 — <0 500 — <2 50 <2 0 1 78 9119/00 P 1259 -1 52 -072 <50 <0 500 — <0 500 — <0 500 — <0 500 — <2 50 <2 0 1 0 11/30/00 P 1383 -276 124 <50 0 <0 500 — <0 500 3 80 <0 500 — <0 500 8 96 -- 234 062 9113101 P 12 17 -1 10 166 <50 4 8 <2 0 <0 50 <2 0 <0 50 <2 0 <0 50 <2 0 — <2 0 1 09 12/31/01 P 1321 -214 -104 900 17 8 6 <0 50 <1 0 064 <1 0 6 0 4 4 — 9 9 — 3M3/02 P 1495 -3 88 -174 870 11 1 5 <0 50 <0 50 <0 50 <0 50 1 2 0 72 — 18 046 QCT8 3/1 — — — — <50 <0 50 — <0 50 — <0 50 — <0 50 — — — — I Projects/ARCO/4493/FieporLsJTables/gwtables4493 As