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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (pg/L) (pg1L) (mg1L) Comments MW-7 11/03/2003 P 888 2250 -1362 320 J - <2 5 UJ <2 5 UJ <2 5 UJ <2 5 UJ <2 5 UJ 196 02/09/2004 P 888 2234 -1346 290 — 55 <2 5 <2 5 68 <2 5 238 45!1012004 P 1 888 2140 -12525< 0 -- <0 5C <0 50 <0 50 —<050 <0 50 1 7 MW-8 8/30/2000 — 935 1885 -950 115 -- <2 <2 <2 <2 <2 NA 11121!2000 - 9 35 19 30 -9 95 <50 -- <0 5 <0 5 <05 <0 5 <2 NA 2/15/2001 -- 9 35 1883 -948 <50 -- <0 5 <0 5 <4 5 <0 5 <2 1 2 5/17/2001 — 935 1890 -955 <50 - <0 5 <0 5 <0 5 <0 5 <2 26 8/16/2001 -- 9 35 2012 -10 77 <50 -- <D 5 <0 5 <0 5 <0 5 <2 0 9 1216!2001 - 9 35 18 29 -8 94 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50 6 2/14/2002 -- 9 35 19 27 -992 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 31 6/13/2002 — 935 1973 -10 38 <50 — <4 50 <0 50 <0 50 <0 5D <0 50 1 2 8/22/2002 -- 9 35 20 78 -11 43 76 -- 23 052 56 44 <0 50 18 11/13/2002 — 935 2085 -11 50 <50 — <050 <0 50 <0 50 <0 50 <0 50 -- 02/2 2120 0 3 P 9 35 2417 -1482 <50 -- <050 <0 50 <0 50 <0 50 <0 50 266 05/29/2003 P --6-3-5— 20 58 -11 23 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 498 08/04/2003 P 9 35 20 81 -11 46 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 2 9 11/03/2003 P 9 35 21 21 -11 86 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 1 18 02109!2004 P 9 35 21 01 -11 66 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 2 44 05110!2004 P 9 35 20 76 -11 41 <50 -- <050 <D 50 <0 50 <0 50 <0 50 196 MW-83 8/30/2000 - 961 2027 -1066 1,130 -- 425 496 106 108 <2 NA 11/21/2000 — 9 61 20$8 -11 27 924[4] — 241 234 525 109 <2 NA 2/1512001 -- 9 61 2088 -11 27 811 [7] -- 159 298 49 492 <2 13 5/17/2001 — 9 61 20 24 -10 63 137[5] — 50 4 1 32 947 4 3 <2 2 5 8/16/2001 -- 961 21 64 -1203 63 12 079 76 42 <2 18 12/6/2001 961 2258 -1297 94[8] — 40 <0 50 55 1 7 <0 50 11 2/14/2002 -- 961 2106 -1145 <50 -- 49 <0 50 <0 50 <0 50 11 1 6 6/13/2002 — 9 61 21 34 -11 73 <50 — 12[11] <D 50 1 3[11j 1 5[11j <0 50 3 3 8/22/2002 — 9 61 2243 -1282 <50 - <0 50 <0 50 <0 50 <0 50 <050 32 11/13/2002 — 961 2356 -1395 <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 05129!2003 P 9 61 21 89 -1228 <50 -- <0 50 <0 50 <0 50 <D 50 <0 50 604 08/04/2003 P 9 fit 45 QO -3539 <50 <0 50 <0 50 <0 50 2 33 i Page 10 of 12 Report Date July 15,2004