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0Page 1 of 4 Table 1 Groundwater Elevation and Analytical Data Former ARCO Service Station#4493 205 N Center St,Stockton,CA Well Depth Groundwater Groundwater Ethyl Xylenes MtBE MtBE Well Date Elevation to Water Elevation Elevation TPHg Benzene Toluene benzene (total) (8020) (8260) DO Number Sampled (ft MSL) (ft TOC) (ft,MSL) Change(it) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) MW 1 2/16/1999 11 94 1335 1 41 — 231 1 35 ND 237 ND ND 3/10/1999 1301 1 07 034 -- -- — — 6/17/1999 11 89 005 1 12 <50 352 <0 5 <0 5 302 <2 0 — 9/24/1999 Well inaccessible 12/16/1999 NP 1439 2 45 <50 235 <0 5 <G 5 302 <2 5 29 3/26/2000 P 1212 018 227 132 0 864 <0 5 <0 5 <0 5 <2 5 1 82 6/192000 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 78 2 5 21 <0 500 <0 500 <0 500 <2 5 <2 0 1 5 11/30/2000 P 1362 -1 68 1 18 909 0 698 <0 500 <0 500 <0 500/2 80' -- <2 0 062 9/13/2001 P 1164 030 1 98 140 2 5/<2 0' <0 50/<2 0' <0 50/<2 0' <0 50/<2 0' -- <2 0 1 72 12/31/011 P 1085 109 079 <50 <0 50/<1 0' <0 50/<1 0' <0 50/<1 0' <0 50/<1 0' -- <0 5 3/13/02 P 1388 1 94 -303 <50 0 62/<0 50' <0 50/<0 50' <0 50/<0 50' <0 50/<0 50' 0 71 1 13 6/28/2002 P 1215 0 21 1 73 <50 1 6 <0 5 <0 5 <0 5 057 1 9 9/16/2002 NP 11 22 1275 -153 050 <50 <0 5 <0 5 <0 5 <0 5 — <0 5 — 12/5/2002 P 1402 280 1 27 <50 <0 5 <0 5 <0 5 <0 5 — <0 5 3 0 3/14/2003 P 1400 -293 -013 <50 058 <G S <0 5 <0 5 — <0 5 1 2 MW 2 2/16/1999 1243 1466 213 -- ND ND ND ND ND ND — — 3/10/1999 1370 1 27 086 -- -- — — — — — 6/17/1999 12 52 0 09 1 18 <50 <0 5 <0 5 <0 5 <0 5 <2 0 — 9/24/1999 NP 1224 019 028 <60 <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 3/28/2000 P 1295 0 52 2 34 522 <0 5 <05 <0 5 1 22 <2 50 2 88 6/19/2000 P 1257 014 0 38 <50 <0 500 <0 500 <0 500 <0 500 <2 50 <2 0 212 9/19/2000 P 12 33 010 024 <50 <0 500 <0 500 0 514 <0 500 <2 50 <2 0 1 8 11130/2000 P 1460 -217 227 138 <0 500 <0 500 <0 500 <0 500 — <2 00 1 58 9/1312001 P 1268 025 1 92 100 <0 50/<2 0' <0 50/<2 0' <0 501<2 0' <0 50/<2 0' <2 0 1 09 12131/01, P 1325 -082 0 57 83` <0 5G/ 3/13/02 P 1573 3 30 2 48 <50 <0 50/<1 0' <0 50/<1 0' <0 50/<1 0' <0 501<1 0' — 51 2 26 6/28/2002 P 1419 1 76 164 59 1 7 <0 5 19 1 1 -- 7 4 2 7 9A 612002 NP 12 06 1479 273 060 <50 <2 5 <2 5 <2 5 <2 5 — 3 4 — 12/5/2002 P 1614 4 08 1 35 51 <2 0 <2 0 <2 0 <2 0 — 31 0 0 3/14/2003 P 1614 -408 000 <100 <1 0 <1 0 <1 0 <1 0 -- 17 1 2 MW 3 2/16/1999 1251 1464 213 — ND ND ND ND ND 7 06 — — 3/10/1999 1399 1 48 065 -- -- -- -- 6/17/1999 1297 -046 1 02 <50 <0 5 <0 5 <0 5 2 26 144 -- 924/1999 Well inaccessible 12/18/1999 NP 15 53 302 — <50 <0 5 <0 5 <0 5 <0 5 <2 50 — 41 3/282000 P 1321 0 7 2 32 <50 <0 5 <0 5 <0 5 <0 5 246 — 224 6/19/2000 P 1279 028 042 <50 <0 500 <0 500 <0 500 <0 500 278 260 1 98 9/192000 P 13 71 1 20 -0 92 75 7 0 512 <0 500 <0 500 <0 500 254 241 0 9 11/30/2000 P 1487 236 1 16 81 1 0 674 <0 500 <0 500 1 15 195 0 76 9/132001 P Well filled with sediment 12/312001 P 1325 074 -- 1,900` 60/39' 8 7/ 3/13/02 P 11361 410 -336 <50 <0 50/<0 50' <0 501<0 50' <0 50/<0 50' <0 50/<0 50' — 1 0 1 08 6/28!2002 P 1446 1 95 215 <500 <5 <5 0 8 <5 <0 5 1 1 9/162002 P 1306 1510 204 -064 <50 <0 5 <0 5 <0 5 <0 5 069 12/5/2002 P 1650 344 140 <50 <0 5 <0 5 <0 5 <0 5 — <0 5 0 5 311412003 P 1615 -309 D35 <50 <05 <0 5 K Mproce WS 6P ARC0%0440MQU8rt0rhAI OTF109V4493 CWMRIC03