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Ta e 1 Groundwater Elevation and Analytical Data Page i of 2 Former ARCO Service Station#4493 205 N Center St,Stockton,CA Well Depth Groundwater Groundwater Ethyl- Xylenes MtBE MtBE Well Date Elevatron to Water Bevabon Elevation TPHg Benzene Toluene benzene (total) (8020) (8260) DO Number Sampled (ft,MSL) (ft,TOC) (ft:MSL_) Change Lftj ., (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (MNL) MW-1 2116199 11 X94 1335 -141 -- 231 135 ND 237 ND ND -- -- 3/10199 1301 -107 034 -- 6/17/99 11 89 005 1 12 <50 352 <05 <0 6 302 <2 0 -- - 9/24/99 Well Inaccessible 12/15/99 NP 1439 -2 45 -- <50 235 <0 6 <05 302 <2 50 -- 2 9 3128/00 P 1212 -018 227 132 0 864 <0 5 <0 6 <0 5 <2 50 -- 182 6119/00 P 1163 0 31 049 <50 0 692 <0 500 <0 600 <0 500 206 <2 0 377 9/19/00 P 1244 -0 50 -0 81 782 5 21 <0 500 <0 500 <0 600 <2 50 <2 0 1 5 11/30/00 P 1362 -168 -1 18 909 0 698 <0 500 <0 500 <0 50012 80* -- <2 00 062 9113/01 P 1164 030 198 140 2-5A2 0* <0 50/Q 0* <0 50/d 0* <0 50/<2 0* — Q.0 172 MW-2 2116/99 1243 1456 -213 -- ND ND ND ND ND ND -- -- 3/10/99 1370 -127 086 -- -- -- _ -- -- - 6/17/99 1252 -009 118 <50 <0 5 <0 5 <0 5 <0 6 <2 0 -- 9/24199 NP 1224 019 028 <50 <0 5 <0 5 <0 5 <0 5 <5 0 -- 4 2 12/16/99 NP 1529 -2 86 -306 <50 <0 5 <0 5 <0 5 <0 5 <2 60 -- 43 3128/00 P 1295 -052 2 34 622 <0 5 <0 5 <0 5 122 <2 50 -- 288 6/19/00 P 12 57 -014 038 <50 <0 500 <0 500 <0 500 <0 500 <2 50 <2 0 212 9/19/00 P 12 33 010 024 <50 <0 500 <0 500 0 514 <0 500 <2 50 <2 0 18 11/30/00 P 1460 -217 -227 138 <0 500 <0 500 <0 500 <0 500 -- <2 00 168 9113101 P 1268 -0 25 192 100 <0 501<2 0* <0 50/4 0* <0 50/<2 0* <0 501<2 0* — &a 109 MW-3 2116(99 1261 1464 -213 -- ND ND ND ND ND 7 06 -- -- 3/10/99 1399 -148 066 -- -- .- __ 6117/99 12 97 -046 102 <50 <0 5 <0 5 <05 226 144 -- -- 9124199 Well inaccessible 12/16/99 NP 1553 -302 -- <50 <0 5 <0 5 <0 5 <0 5 <2 50 -- 4 1 W28(00 P 1321 -0 7 2 32 <50 <0 5 <0 5 <0 5 <0 5 246 ._ 224 6/19100 P 1279 -028 042 <50 <0 500 <0 500 <0 500 <0 500 278 260 198 9119/00 P 1371 -120 -092 75 7 0 512 <0 500 <0 500 <0 500 254 241 0 9 11/30/00 P 1487 -236 -1 16 81 1 0 674 <0 500 <0 500 115 -- 195 076 9113101 P Well filled with dirt MW-4 2116199 1219 1441 222 15,000 503 ND 707 1,550 9,990 3/10/99 1361 -142 0 8 -- -- 6/17/99 1243 -024 1 18 10,800 230 177 597 936 766 -- -- 9/24199 NP 1272 -063 -0 29 4,880 173 <100 262 <10 670 4 9 12/16/99 NP 1517 -2 98 -2 46 7,830 260 <100 570 113 1,310 -- 19 3/28/00 P 1283 -064 2 34 5,330 298 <20 0 318 443 4,960 -- 100 6/19100 P 1244 -025 039 2,860 186 <20 0 223 123 3,790 <2 0 882 9/19100 P 1332 -1 13 -088 3,460 234 <100 300 150 2,210 1,710 08 11/30/00 P 1444 -226 -112 3,640 2191177* <6 00 499/389* 39 0/27 0* -- 427 073 9/13/01 P 1226 -007 218 1,600 110/79* <10<20* 21/<20* 11124* — 680 072 ProJects/ARCO/4493/Reporte/Tables/gwtables4493xAs