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Table 1 Groundwater Elevation and Analytical Data Former ARCO Service Station No 2168 441 W Charter Way, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) UtgIL) (Erg1L) (pg1L) WL) (P9/L (pg1L) UVIL) (mg/L) Comments MW-8B 5/17/2001 -- 961 2024 -1063 137[5] — 504 1 32 947 43 <2 25 8/16/2001 — 961 2164 -1203 63 -- 12 079 76 42 <2 18 12/6/2001 -- 961 2258 -1297 94[8) — 40 <0 50 55 17 <0 50 11 2/14/2002 — 961 2106 -1145 <50 — 4 9 <0 50 <0 50 <0 50 1 1 16 6/13/2002 — 961 2134 -1173 <50 — 12[11] <0 50 1 3[11] 1 5[11] <0 50 33 8!2212002 — 1 961 2243 -1282 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 32 11/13/2002 -- 961 2356 -13 95 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 — 02/12/2003 P 961 2401 -1440 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 191 i 05/29/2003 P 961 21 89 -1228 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 604 08/04/2003 P 961 4500 -3539 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 233 11/03/2003 P 961 2351 -1390 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 1 1 02/09/2004 P 961 2327 -1366 <50 — <0 50 <0 50 <0 50 <0 50 0 68 212 05/10/2004 P 961 2237 -1276 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50 133 08/0912004 P 961 2363 -1402 <50 -- <0 50 <0 50 <0 50 <0 50 1 <0 50 69 MW-8C 8/30/2000 -- 901 2121 -1220 68 5 — 156 678 218 758 <2 NA 11/21/2000 — 901 1919 -1018 <50 — 0 692 <0 5 <0 5 <0 5 <2 NA 2/15/2001 — 901 2055 -11 54 <50 — 184 173 <50 194 <2 2 5/17/2001 — 901 1995 -10 94 <50 -- 0 861 <0 5 <0 5 <0 5 <2 2 8/16/2001 -- 901 2141 -1240 <50 — 071 <05 <0 5 <0 5 <2 44 12/612001 -- 901 2228 -1327 150 -- 47 1 2 12 45 <0 50 1 3 2/14/2002 -- 901 2064 -1163 <500[9] — 120[9] <5 0[9] 18[9] <5 0[9] 13 18 6/13/2002 — 901 21 10 -1209 <50 — 68 <0 50 <0 50 062 054 18 8/22/2002 -- 901 2213 -1312 <50 — 056 <0 50 <0 50 <0 50 062 3 6 11/13/2002 -- 901 2303 -1402 <50 — 066 <050 <0 50 <0 50 072 — 02/12/2003 P 901 2477 -1576 <50 — <0 50 <0 50 UJ <0 50 <0 50 078 175 05/29/2003 P 901 2167 -1266 <50 — <0 50 <0 50 <0 50 <0 50 085 514 08/04/2003 P 901 2215 -1314 <50 — <0 50 <0 50 <0 50 <0 50 0 79 247 11/03/2003 P 901 2338 -1437 <50 — <0 50 <0 50 <0 50 <0 50 0 69 1 02/09/2004 P 901 2314 -1413 <50 -- <0 50 <0 50 <0 50 <0 50 068 13 05/10/2004 P 901 2214 -1313 <50 -- <0 50 <0 50 <0 50 <0 50 065 204 08109/2004 P 9 01 2340 4439 <50 -- <0 50 <0 50 1 <0 50 <0 50 <0 50 53 I Report Date September 24,2004 Page 11 of 12