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Fage 2 of 6 Table 1 Groundwater Elevation and Analytical Data Former ARCO Station No 4493 205 North Center Street,Stockton,California 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(ft) (f►g1L) (pglL) (pg/L) (frg/L) 44/L) 91) (I1gIL) (mg/!-) MW-3 2/16/1999 1251 1464 213 -- ND ND ND ND ND 706 3/10/1999 1399 -148 065 -- -- -- -- -- -- 6/17/1999 1297 -0 46 1 02 <50 <0 5 <0 5 <0 5 226 144 - -- 9/24/1999 Well Inaccessible 12/1611999 N P 15 53 302 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 41 3/2812000 P 1321 -0 7 2 32 <50 <0 5 <0 5 <0 5 <0 5 246 224 6/19/2000 P 1279 -028 0 42 <50 <0 5 <0 5 <0 5 <0 5 278 260 198 9/19/2000 P 1371 -120 -0 92 75 7 0 512 <0 5 <0 5 <0 5 254 241 0 9 11/30/2000 P 1487 -236 -1 16 81 1 0 674 <0 5 <0 5 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 0114" 30117` - 150 -- 3/13/02 P 1661 -410 -336 <50 <0 50/<0 50' <0 50/<0 50' <0 501<0 50' <0 501<0 50' -- 1 0 1 08 6/28/2002 P 1446 -195 215 <500 <5 0 <5 0 08 <5 0 <0 5 1 1 9/16/2002 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 3/14/2003 P 1615 -309 0 35 <50 <0 5 <0 5 <0 5 <0 5 <0 5 1 8 6/9/2003 P 1566 -260 0 49 <50 <1 0 <1 0 <1 0 <1 0 <1 0 1 4 9/25/2003 P 1597 -291 -031 <50 <1 0 <1 0 <1 0 <1 0 -- <1 0 0 9 12!23/2003 P 1671 -365 -074 <50 <1 0 <1 0 <1 0 <2 0 -- <1 0 1 4 MW-4 2/16/1999 1219 1441 -222 -- 15,000 503 ND 707 1,550 9,990 -- 3/10/1999 1361 -142 0 8 -- -- -- -- -- -- -- -- 6/17/1999 1243 -024 1 18 10,800 230 17 7 597 936 766 -- 9/24/1999 NP 1272 -053 -029 4,880 173 <10 262 <10 670 49 12/16/1999 NP 1517 -298 -245 7,830 260 <10 570 113 1,310 1 9 3/28/2000 P 1283 -064 2 34 5,330 298 <20 318 443 4,960 -- 1 0 6/19/2000 P 12 44 -025 0 39 2,860 186 <20 223 123 3,790 <2 0 382 9/19/2000 P 1332 -1 13 -088 3,460 234 <10 300 150 2,210 1,710 0 8 11/30/2000 P 1444 -225 -1 12 3,640 2191177' <5 0 499/389' 39127' -- 427 073 9/13/2001 P 1226 -007 218 1,600 110179" <10<20' 211<20' 11/24' 680 072 12/3112001 P 1260 -0 41 -0 34 <50 <0 51<1 0' <0 5/<l 0' <0 51<1 0' <0 5/<1 0' <0 5 -- 3/13/2002 P 1626 -407 -366 960 27125' <5 0/0 96' <5 0/3 5' <5 014 7' 120 0 98 6/28/2002 P 1466 -2 47 1 60 510 42 <0 5 2 8 1 9 -- 130 1 2 9/16/2002 P 1259 1524 -2 65 -058 860 61 <2 5 2 8 2 8 150 -- 12/5/2002 P 1660 -401 -1 36 1,400 23 6 4 <2 5 12 140 00 3/14/2003 P 16 52 -393 008 2,100 76 19 12 28 180 1 0 6/9/2003 P 1583 -324 0 69 3,900 60 <25 <25 32 -- 130 0 9 9/25/2003 P 1611 -352 -028 430 <5 0 <5 0 <50 <50 93 0 3 12/23/2003 P 1701 -442 -090 1,600 28 <10 <10 <10 -- 81 1 8 KAWproxms J5 SPARC0544MMMInstaIM493GWMR40133