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TO Page 10(2 Groundwater Elevation and Analytical Data • a Former ARCO Service Station#4493 205 North Center Street Stockton,California Well Depth Groundwater Change in TPH as Ethyl- Well Dans Elevation to Water Elevation Groundwater Gasoltne Benzene Toluene benzene Xylenes MtBE MtBE(8260) DO Number Sampled (feet,MSL) (fast,TOC) (tees,MSL) (feet,MSL) _ (ppb) (ppb) (Ppb) (ppb) (ppb) (ppb) (ppb) MO MW-1 2/16(1999 1194 1335 -141 — 231 135 ND 2 37 ND ND - -- 3l10/1999 1301 -107 0 34 -- -- -- -- - -- -- - 06/17/99 1189 005 1 12 <50 352 <0 5 <0 5 302 <2 0 - -- 09/24/99 --_-_--..-----_--------Well l naccessable---------------------------- -- 12/16(99 NP 14 39 -2 45 — <50 235 <0 5 <0 5 302 <2 50 - 2 9 03128/00 P 1212 -018 227 132 0 864 <0 5 <0 5 <0 5 <2 50 -- 182 06/19/00 P 1163 031 049 <50 0 692 <0 500 <0 500 <0 500 206 <2 0 377 09/19/00 P 1244 -050 -081 78 2 5 21 <0 500 <0 500 <0 500 <2 50 <2 0 15 11/30/00 P 1362 -168 -118 909 0 698 <0 500 <0 500 <0 500/2 80* — <2 00 062 MW-2 2/16/1999 1243 1456 -213 -- ND ND ND ND ND ND - 3(10/1999 1370 -127 086 -- -- -- -- - -- 06/17199 -06/17199 1252 -009 1 18 <50 <0 5 <0 5 <0 5 <0 5 <2 0 - 09/24/99 NP 1224 019 0 28 <50 <0 5 <0 5 <0 5 <0 5 <5 0 42 12J 16199 N P 1529 -286 -306 <50 <0 5 <0 5 <0 5 <0 5 <2 50 -- 4 3 03128/00 P 1295 -052 2 34 522 <0 5 <0 5 <0 5 122 <2 50 -- 2 88 06/19/00 P 1257 -014 038 <50 <0 500 <0 500 <0 500 <0 500 <2 50 <20 212 09/19/00 P 1233 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 1S8 MW-3 2/16/1999 1251 1464 -213 -- ND ND ND ND ND 706 -- 3110/1999 1399 -148 0 65 -- -- -- -- - -- -- -- 06117/99 1297 -046 102 <50 <0 5 <0 5 <0 5 2 26 144 -- 09/24/99 ------------------------—Well Inaocessable-------—-------------------- -- - 12/16/99 NP 1553 -302 -- <50 <0 5 <0 5 <0 5 <0 5 <2 50 -- 41 03/28/00 P 1321 -07 232 <50 <0 5 <0 5 <0 5 <05 246 -- 224 06/19/00 P 1279 -028 042 <50 <0 500 <0 500 <0 500 <0 500 278 260 198 091119100 P 1371 -120 -092 75 7 0 512 <0 500 <0 500 <0 500 254 241 0 9 11/30/00 P 1487 -2.36 -116 811 0 674 <0 500 <0 500 115 — 195 0 76 MW-4 2/16/1999 1219 1441 -222 -- 15,000 503 ND 707 1,550 9 990 3/10/1999 1361 -142 08 -- -- -- -- -- -- -- 6(1711999 1243 -024 1 18 10,800 230 177 597 936 766 09/24/99 NP 1272 -063 -029 4,880 173 <100 262 <10 670 - 4 9 12/16(99 NP 1517 -298 -245 7,830 260 <10 0 570 113 1,310 19 03128/00 P 1283 -064 2 34 5,330 298 <20 0 318 443 4,960 -- 100 06(19/00 P 1244 -026 039 2,860 186 <20 0 223 123 3,790 <2 0 382 09/19/00 P 1332 -113 -088 3,460 234 <10 0 300 150 2,210 1,710 08 11/30/00 P 1444 -2.25 -112 3,640 219/177'' <5 00 4991389* 39 0127 0* — 427 0 73