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T I S
<br /> HISTORICAL GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton,California
<br /> Elevation
<br /> Top of Static Water Water Depth to Ethyl- Total Dissolved
<br /> Well ID Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MTBE Oxygen
<br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) pg/L µg/L pg/L pg/L pg/L pg/L (ppm) Observations
<br /> MW-1C 08/30/00 1021 22 19 -1198 1050 53 7 6 3 <2 <2 406 <2 NA No FP,No S,Yes O
<br /> 11/21/00 1021 2169 -1148 62 3 [4] 569 121 0 999 3 51 <2 NA No FP,No S,Yes 0
<br /> 02/15/01 1021 21 80 -1159 <50 9 88 142 164 259 <2 08 No FP,No S,O=NE
<br /> 05/17/01 1021 2123 -1102 <50 909 0 708 157 1 18 <2 1 l No FP,No S,Yes 0
<br /> MW-2 53 02/16/95 1083 3748 -2665 330 36,000 6,300 4,600 610 2,700 NA NA No FP,No S,O=NE
<br /> 05/17/95 Wei[Inaccessible
<br /> 53 08/15/95 1083 3245 -2162 20,000 3,500 2,000 280 1,300 NA NA No FP,No S,Yes 0
<br /> 53 11/29/95 1083 3262 -21 79 30,000 3,800 2,700 380 1,800 NA NA No FP,No S,Yes O
<br /> 02/27/96 1083 2987 -1904 Well not sampled
<br /> 53 05/15/96 1083 28 16 -1733 16,000 2,600 1,000 210 910 <200**[1] NA No FP,No S,Yes 0
<br /> 53 08/22/96 1083 2876 -1793 34,000 5,900 2,500 560 2,300 <300**[I] NA No FP,No S,Yes 0
<br /> 11/25/96 1083 2895 -18 12 26,000 4,000 2,000 390 1,800 <300*[1] NA No FP,No S,Yes 0
<br /> 02/24/97 10 83 2495 -14 12 22,000 3,100 1,300 340 1,400 <500**[1] NA No FP,No S,Yes 0
<br /> 05/19/97 1083 2484 -1401 28,000 4,700 1,900 480 2,200 <300*[I] NA No FP,No S,Yes O
<br /> 52 08/21/97 1083 2592 -1509 15,000 3,000 1,200 320 1,200 <500**[1] NA No FP,No S,Yes 0
<br /> 53 11/17/97 1083 2694 -16 11 2,200 510 120 44 130 <100**[I] NA No FP,No S,No 0
<br /> 53 02/09/98 1083 2433 -1350 15,000 3,700 790 440 1,000 <500**[I] NA No FP,No S,Yes 0
<br /> 52 05/21/98 1083 2038 -955 10,200 2,220 562 238 628 <100 NA No FP,No S,Yes 0
<br /> 52 08/12/98 1083 2057 -974 1,100 234 390 23 8 494 <2 NA No FP,No S,Yes 0
<br /> 52 11/09/98 1083 2167 -1084 4,420 1,050 212 116 278 <2 NA No FP,No S,Yes 0
<br /> 52 02/17/99 1083 2098 -1015 8,450 1,790 332 266 499 <2 NA No FP,No S,Yes 0
<br /> 52 05/25/99 1083 2028 -945 1,720 469 479 57 8 764 <2 NA No FP,No S,Yes 0
<br /> 52 08/18/99 1083 2140 -1057 8,870 2,610 176 316 411 <2 NA No FP,No S,Yes 0
<br /> 52 12/17199[2] 1083 2224 -1141 1,090 309 796 12 8 5 <2 NA No FP,No S,O=NE
<br /> 52 02/22/00 1083 2137 -1054 4,510 1,500 138 151 207 <2 NA No FP,No S,Yes 0
<br /> 53 06/22/00 10 83 20 19 -936 735 141 17 12 22 <2 NA No FP,No S,Yes 0
<br /> 08/30/00 10 83 2239 -1156 8,200 2,310 204 259 322 <2 NA No FP,No S,Yes 0
<br /> 11/21/00 10 83 2196 -11 13 1,140[4] 210 174 233 515 <2 NA No FP,No S,Yes O
<br /> 02/15/01 1083 21 89 -1106 1,240[6] 161 <5 0 522 11 1 <2 10 No FP,No S,O=NE
<br /> 05/17/01 1083 21 27 -1044 389(51 289 , <25 456 <2 5 <2 15 No FP,No S,Yes O
<br /> C%ARC0121681QTRLYkrASLE51Arco2l68 QUARTERLY DATA
<br /> 2 of 8 Delta 7118/01
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