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TAS
<br /> HISTORICAL.GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton,Callfomla
<br /> Elevation
<br /> Top of Static Water Water Depth to Ethyl- 7 otal Dissolved
<br /> Well ID Casing(feet Level Elevation Screen 1 PHG Benzene Toluene benzene Xylenes MTBE Oxygen
<br /> &Sample Date tnsl) (feet bgs) (feet ms]) (feet bgs) µg/L gg1L pg/L µBIL ltg/L µg/L (ppm) Observations
<br /> Mw-1C 8/30100 1021 22 19 -1198 1050 537 63 <2 <2 406 <2 NA No FP,No S,Yes O
<br /> 11/21/00 2169 -1148 62 3[4] 5 69 121 0 999 351 <2 NA No FP,No S,Yes 0
<br /> 2/15/01 2180 -1159 <50 988 142 164 259 <2 08 No FP,No S,O=NE
<br /> 5/17101 2123 -1102 <50 909 0 708 1 57 1 18 <2 1 1 No FP,No S,Yes O
<br /> 8116101 2266 -1245 <50 42 065 <0 5 083 <2 24 No FP,No S,No 0
<br /> 12/6/01 23 57 -1336 <50 93 <0 50 1 4 072 <0 50 13 No FP,No S,Yes 0
<br /> i
<br /> MW-2 53 2/16195 1083 3748 -2665 330 36,000 6,300 4,600 610 2,700 NA NA No FP,No S,O=NE
<br /> 5/17/95 Well Inaccessible
<br /> 53 8115/95 3245 -2162 20,000 3,500 2,000 280 1,300 NA NA No FP,No S,Yes 0
<br /> 53 11/29/95 3262 -2179 30,000 3,800 2,700 380 1,800 NA NA No FP,No S,Yes 0
<br /> 2/27196 2987 -1904 Well not sampled
<br /> 53 5/15/96 28 16 -1733 16,000 2,600 1,000 210 910 <200**[1] NA No FP,No S,Yes 0
<br /> 53 8/22/96 2876 -1793 34,000 5,900 2,500 560 2,300 <300**[1] NA No FP,No S,Yes 0
<br /> 11/25/96 2895 -18 12 26,000 4,000 2,000 390 1,800 <300*[1] NA No FP,No S,Yes 0
<br /> 2/24/97 2495 -14 12 22,000 3,100 1,300 340 1,400 <500**[ll NA No FP,No S,Yes 0
<br /> 5/19/97 2484 44 01 28,000 4,700 1,900 480 2,200 <300*[I] NA No FP,No S,Yes 0
<br /> 52 8121/97 2592 -1509 15,000 3,000 1,200 320 1,200 <500**[I] NA No FP,No S,Yes 0
<br /> 53 11/17/97 2694 -16 11 2,200 510 120 44 130 <100**[1] NA No FP,No S,No O
<br /> 53 219198 2433 -1350 15,000 3,700 790 440 1,000 <500**[1] NA No FP,No S,Yes 0
<br /> 52 5121198 2038 -955 10,200 2,220 562 238 628 <100 NA No FP,No S,Yes 0
<br /> 52 8/12198 2057 974 1,100 234 390 23 8 494 <2 NA No FP,No S,Yes 0
<br /> 52 1119198 2167 -1094 4,420 1,050 212 116 278 <2 NA No FP,No S,Yes 0
<br /> 52 2/17/99 2099 -10 15 8,450 1,790 332 266 499 <2 NA No FP,No S,Yes 0
<br /> 52 5/25/99 2028 -945 1,720 469 479 578 764 <2 NA No FP,No S,Yes 0
<br /> 52 8/18/99 2140 -1057 8,870 2,610 176 316 411 <2 NA No FP,No S,Yes 0
<br /> 52 12/17/99[2] 2224 -1141 1,090 309 796 128 5 <2 NA No I-P,No S,O=NE
<br /> 52 2/22100 2137 -1054 4,510 1,500 138 151 207 <2 NA No rP,No S,Yes 0
<br /> 53 6/22100 20 19 -936 735 141 17 12 22 <2 NA No UP,No S,Yes 0
<br /> 8130/00 2239 -1156 8,200 2,310 204 259 322 <2 NA No r P,No S,Yes O
<br /> 11/21/00 2196 -11 13 1,140[41 210 174 23 3 51 5 <2 NA No FP,No S,Yes O
<br /> 2/15/01 2189 -11 06 1,240[6] 161 <5 0 522 11 1 <2 10 No 1 P,No S,O=NE
<br /> 5117101 2127 -1044 389[5] 289 <2 5 456 <2 5 <2 1 5 No FP,No S,Yes 0
<br /> 8/16101 2257 -1174 470 73 <0 5 34 40 <2 29 No FP,No S,Yes 0
<br /> 1216101 23 55 -1272 <2,000 26 <20 <20 <20 <5 0* 1 3 No FP,No S,Yes 0
<br /> Arco2168_Quarterly_Data As_ 2 of8 Delta
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