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TABLE 1 Groundwater Monitoring and Analytical Data - Former ARCO Service Station No 2168 441 Charter Way Stockton, California Elevation Top of Static Groundwater Depth to Ethyl- Total Dissolved Well ID Casing Water Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MtBE Oxygen &Sample Date (feet msl) (feet bgs) (feet msl) (feet bgs) ug/L ug/L ug/L ug/L ug/L ug/L (mg/L) MW-8B 8/30/2000 9 61 2027 -1066 750 1,130 425 496 106 108 <2 NA 11/21/2000 2088 -1127 924[4] 241 23 4 525 109 <2 NA 2/15/2001 20 88 -1127 811 [7] 159 29 8 49 0 49 2 <2 1 3 5/17/2001 20 24 -1063 137[5] 504 1 32 947 4 3 <2 2 5 8/16/2001 21 64 -1203 63 12 0 79 7 6 4 2 <2 1 8 12/6/2001 2258 -1297 94[8] 40 <0 50 5 5 17 <0 50 1 1 2/14/2002 2106 -1145 <50 4 9 <0 50 <0 50 <0 50 1 1 1 6 6/13/2002 21 34 -11 73 <50 12[11] <0 50 1 3[11] 1 5[11 j <0 50 3 3 8/22/2002 2243 -1282 <50 <0 50 <0 50 <0 50 <0 50 <0 50 3 2 11/13/2002 23 56 -1395 <50 <0 50 <0 50 <0 50 <0 50 <0 50 - 2/12/2003 24 01 -1440 <50 <0 5 <0 5 <0 5 <0 5 -- 1 9 5/29/2003 21 89 -1228 <50 <0 5 <0 5 <0 5 <0 5 <0 5 8 0 MW-8C 8/30/2000 9 01 2121 -1220 1050 685 156 678 218 7 58 <2 NA 11/21/2000 1919 -1018 <50 0 692 <0 5 <0 5 <0 5 <2 NA 2/15/2001 20 55 -11 54 <50 1 84 173 <50 194 <2 2 0 05/17/01 1995 -10 94 <50 0 861 <0 5 <0 5 <0 5 <2 2 0 8/16/2001 21 41 -1240 <50 0 71 <0 5 <0 5 <0 5 <2 44 12/6/2001 2-228 -1327 150 47 1 2 12 4 5 <0 50 1 3 2/14/2002 20 64 -1163 <500[9] 120[9] <5 0[9] 18[9] <5 0[9] 1 3 1 8 6/13/2002 21 10 -1209 <50 6 8 <0 50 <0 50 082 0 54 1 8 8/22/2002 2213 -1312 <50 0 56 <0 50 <0 50 <0 50 0 62 3 6 11/13/2002 2303 -1402 <50 0 66 <0 50 <0 50 <0 50 072 -- 2/12/2003 2477 -1576 <50 <0 5 <0 5 <0 5 <0 5 078 1 8 5/29/2003 21 67 -1266 <50 <0 5 <0 5 <0 5 <0 5 0 85 5 1 K 1Wprocew\J5 BP ARC01D21681QuanerIy\2 QTR 0352168 QW MR 2003 9 of 10