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Table 1 Groundwater Elevation and Analytical Data Former ARCO Service Station No 2168 441 W Charter Way, Stockton CA Top of Depth to Water Level Ethyl- Total Well Date P! Casing Water elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP Elevation (feet bgs) (feet msl) (pglL) (pg/L) (pg/L) (pg/L} (pg/L) (pg/L) (pglL) (mglL} Comments MW-8 6/13/2002 -- 935 1973 -1038 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 12 8122/2002 — 935 2078 -1143 76 — 23 0 52 5 6 44 <0 50 18 11/13/2002 -- 935 2085 -1150 <50 -- <0 50 <0 50 <0 50 <D 50 <0 50 — 02/12/2003 P 9 35 24 17 -14 82 <50 -- <0 50 <0 50 <0 50 <0 50 <0 5Q 2 66 05/29/2003 P 9 35 20 58 -11 23 <50 — <D 50 <0 50 <D 50 <0 50 <0 50 498 08/04/2003 P 935 20 81 1146 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50 2 9 11/03/2003 P 935 2121 -1186 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50 118 02/0912004 P 9 35 21 01 -1 i 66 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 244 MW-8B 8/30/2000 — 961 2027 -1066 1 130 — 425 496 106 108 <2 NA 11/21/2000 - 961 2088 -1127 924[4] — 241 23 4 52 5 10 9 <2 NA 2/15/2001 — 9 61 20 88 -11 27 811 [7] — 159 298 49 492 <2 13 5/17/2001 — 961 2024 -1063 137[5] -- 504 132 947 43 <2 25 8/16/2001 — 961 2164 -1203 63 -- 12 079 76 4 2 <2 1 8 12/6/2001 -- 961 2268 -1297 94[8] — 40 <050 55 1 7 <0 50 1 1 2/14/2002 — 961 21 06 1145 <50 -- 4 9 <0 50 <0 50 <0 50 1 1 16 6/13/2002 -- 961 21 34 -1173 <50 — 12[11] <0 50 1 3[11] 1 5[11] <0 50 33 <50 <650 <0 50 <0 50 <0 50 <0 50 3 2 8/22/2002 — 961 22 43 -12 82 ~ 11/13/2002 -- 961 2356 -1395 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50 -- 02/12/2003 P 9 61 24 01 -14 40 <50 - <0 50 <0 50 <0 50 <0 50 <0 50 1 91 05/2912003 P 9 61 21 89 -12 28 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 6 D4 08/04/2003 P 961 45 00 -35 39 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50 2 33 11/03/2003 P 961 2351 -1390 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 1 1 02109!2004 P 9 6i 23 27 -13 66 <50 -- <0 50 <0 50 <0 50 <D 50 0 68 212 MW-8C $130/2000 -- 9 01 21 21 -12 20 68 5 — 156 678 218 758 <2 NA 11/21/2000 -- 901 1919 -1018 <50 — 0 692 <05 <0 5 <05 <2 NA 2/15/2001 -- 901 2055 -11 54 <50 - 1 84 1 73 <50 194 <2 2 5/17/2001 -- 901 1995 -1094 <50 -- 0 861 <0 5 <05 <0 5 <2 2 8/16/2001 - 901 2141 12 40 <50 0 71 <D 5 <0 5 <0 5 <2 44 12/6/2001 -- 9 01 2228 -1327 150 — 47 12 12 4 5 <0 50 1 3 2!1412002 — 9 01 20 64 -11 63 <500[9] — 120[9] <5 0[9] 18[9] <5 0[9] 13 1 8 6/13/2002 — 9 D1 21 10 -1209 <50 — 68 <0 50 <0 50 062 054 18 8122/2002 -- 901 2213 1312 <50 — 0 56 <0 50 <0 50 <0 50 062 36 --- 11/1312002 -- 901 2303 -1402 <50 - 066 <0 50 <050 <0 50 072 - Page 10 of 12 Report Date April 21,2004 I