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4ge 1 of 3 Table 1 Groundwater Elevation and Analytical Data Former ARCO Service Station#4493 205 N Center St Stockion CA Well Depth Groundwater Groundwater Ethyl- Xylenes M1BE M1BE Well Date Elevation to Water Elevation Elevation TPHg Benzene Toluene benzene (total) (8020) (8260) DO Number Sampled tt MSL ft TOC ft MSL Chan e ft b b b b b b b m A- MW-1 2/16/1999 11 94 1335 1 41 231 135 NO 237 ND ND - 3/10/1999 1301 1 07 0 34 - - - - - 6/17/1999 11 89 005 1 12 <50 3 52 <0 5 <0 5 3 02 <2 0 - 9/24/1999 Well Inaccessible 12/16/1999 NP 1439 245 -- <50 2 35 <0 5 <0 5 3 02 <2 50 -- 2 9 3/28,02000 P 1212 -018 227 132 0 864 <0 5 <0 5 <0 5 <2 50 1 82 6/191'2000 P 11 63 0 31 049 <50 0 692 <0 500 <0 500 <0 500 206 <2 0 3 77 9/19/2000 P 1244 -0 50 -081 782 521 <0 500 <0 500 <0 500 <2 50 <2 0 1 5 11/30/2000 P 1362 1 68 1 18 909 0 698 <0 500 <0 500 <0 500%2 60' <2 00 062 9/132001 P It 64 030 1 96 140 2-5/<2 0" <0 50/<2 0- <0 50/<2 0' <0 50/<2 0 <2 0 172 12/31/011 P 1085 1 09 079 <50 <0 50/<1 0' <0 50/<1 0- <0 50/<1 0` <0 50/<1 0' <0 50 -- 3/13/02 P 1388 1 94 303 <50 0 62/<O 50- <0 50/<0 50' <0 50/<0 50- <0 50/<0 50' 0 71 1 13 6282002 P 1215 -0 21 1 73 <50 16 <0 5 4 5 <0 5 057 1 9 9/16/2002 NP 1122 1275 -153 -060 <50 <0 5 <04 <OS <0 5 -- <0Z - MW 2 2/16/1999 1243 1456 213 - ND ND ND ND NO ND - 3/10/1999 1370 -1 27 0 86 - -- - - - 6/17/1999 1252 -0 09 1 18 <50 <0 5 <0 5 <0 5 <0 5 <2 0 - - 924/1999 NP 1224 019 028 <50 <0 5 <0 5 <0 5 <0 5 <5 0 - 4 2 12/16/1999 NP 1529 286 305 <50 <0 5 <0 5 <0 5 <0 5 <2 50 4 3 3282000 P 1295 -0 52 234 52 2 <0 5 <0 5 <0 5 1 22 <2 50 2 88 6/19/2000 P 1257 -014 038 <50 <0 500 <0 500 <0 500 <0 500 <2 50 <2 0 212 9/192000 P 1233 010 024 <50 <0 500 <0 500 0 514 <0 500 <2 50 <2 0 1 8 11/30/2000 P 1460 217 227 138 <0 500 <0 500 <0 500 <0 500 - <2 00 1 58 9/132001 P 1268 -026 1 92 100 <0 50/110' <0 50/<2 0- <0 50/<2 0' <0 50/<2 0- -- <2 0 1 09 12/31/01J P 1325 -082 -057 83` <0 50/ 3/13/02 P 1573 -330 2 48 <50 <0 50/<1 0' <0 50/ 628/2002 P 1419 176 1 54 59 1 7 <0 5 1 9 1 1 -- 7 4 2 7 9/1 G/2002 NP 1206 1479 273 -060 <50 <2 5 <2X <2 5 <2S - 3 4 - MW 3 2/16/1999 1251 1464 213 - ND NO ND ND NO 7 06 - 3/10/1999 1399 1 48 065 - -- - - - - 6/17/1999 1297 -0 46 1 02 <50 <0 5 <0 5 <0 5 2 26 144 - - 924/1999 Well inaccessible 12/16/1999 NP 1553 -302 - <50 <0 5 <0 5 <0 5 <0 5 <2 50 - 41 3282000 P 1321 .07 2 32 <60 <0 5 <0 5 <0 5 <0 5 246 - 224 6!192000 P 1279 -028 042 <50 <0 500 <0 500 <0 500 <0 500 278 260 1 98 9/192000 P 1971 1 20 -0 92 75 7 0 512 <0 500 <0 500 <0 500 254 241 0 9 11/30/'2000 P 1487 2 36 -1 is 81 1 0 674 <0 500 <0 500 1 15 - 195 0 76 9/13/2001 P Well filled with sediment 12/31/2001 P 1325 -074 - 1,900` 60/39' 8 7/<10' <5 0/14` 30/17- - 150 -- 3/13/02 P 16 61 -410 3196 <50 <0 50/<0 50' <0 50/<0 50' <0 50/<O 50` <0 50/<0 50' - 1 0 1 08 628/2002 P 1446 -195 215 <500 <5 <5 0 6 <5 <0 5 1 1 9/16t2002 P 1306 1510 -204 -064 <5O <0 5 <0 5 <0 5 <0 5 - 0 69 -- j kUbSP ARoM4r=Quarlerll LQTR 021Teble 12-3