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0 loge 2of5 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 (iota!) (8020) (8260) DO Number Sampled ft,MSL ft,TOC ft MSL Change(itu L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (m2/Q MW 3 12/16/1999 NP 1563 -302 -- <50 <05 <0 5 <0 5 <0 5 <2 5 4 1 (cont) 3/28/2000 P 1321 -0 7 232 <50 <05 <0 5 <0 5 <0 5 246 2 24 6/19/2000 P 1279 -028 042 <50 <05 <0 5 <0 5 <0 5 278 260 1 98 9/19/2000 P 1371 -120 0 92 767 0 512 <0 5 <0 5 <0 5 254 241 0 9 11130112000 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 -- 1,9002 60139* 8 7/<10* <5 0114` 30117* 150 3113/02 P 1661 410 -336 <50 <0 50/<O 50* <0 501<0 50* <0 501<O 50* <0 50/<0 50* 1 0 108 5/28/2002 P 14 46 -195 215 <500 <5 0 <5 0 0 8 <5 0 <0 5 1 1 9/16/2002 P 1306 1610 -204 -064 <50 <0 5 <0 5 <0 5 <0 5 0 69 - 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 309 036 <50 <0 5 <0 5 <0 5 <0 5 -- <0 5 1 8 6/9/2003 P 1566 -2 60 049 <50 <1 0 <1 0 <1 0 <1 0 -- <1 0 14 MW 4 2/16/1999 1219 14 41 -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 -0 29 4,880 173 <10 262 <10 670 - 4 9 12/16/1999 NP 1517 -2 98 -2 45 7,830 260 <10 570 113 1,310 1 9 3/28/2000 P 1283 -0 64 2 34 5,330 298 <20 318 443 4,960 10 6/19/2000 P 1244 -025 039 2,860 186 <20 223 123 3,790 <2 0 382 9/19/2000 P 1332 -1 13 0 88 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 2118 1,600 110!79* <10<20* 21/<20* 11124* - 680 072 12/31/2001 P 1260 -0 41 034 <50 <0 5/<1 0* <0 51<1 0' <0 5/<1 0* <0 5/<1 0* <0 5 -- 3/13/2002 P 1626 -407 366 960 27/25* <5 010 96* <5 013 5* <5 0/4 7* 120 0 98 6/28/2002 P 1466 -247 160 510 4 2 <0 5 2 8 1 9 130 1 2 9/16/2002 P 1259 1524 -265 -058 860 6 1 <2 5 2 8 2 8 150 -- 12/5/2002 P 1660 -4 01 136 1 400 23 6 4 <2 5 12 140 0 0 3/14/2003 P 1652 -393 008 2,100 76 19 12 28 -- 180 10 6/9/2003 P 1583 -324 0 69 3,900 60 <25 <25 32 -- 130 0 9 MW 5 6/19/2000 P 1203 1298 096 <50 275 <0 5 <0 5 <0 5 <2 50 <2 0 209 9/19/2000 P 1365 162 -067 <50 1 19 <0 5 <0 5 <0 5 <2 50 <2 0 0 6 11/30/2000 P 1488 -2 85 -123 <50 0 0 694 <0 5 <0 5 <0 5 -- <2 0 121 9/13/2001 P 1598 -3 95 -1 10 <50 <0 51<2 0* <0 5/<2 0* <0 5/<2 0* <0 51<2 0* - <2 0 088 12/31/2001 P NS - - 542 7 2115 9* <0 51<1 0* 15/10* <0 5/<1 0* 60 -- 311312002 P 1878 -676 370 32127* 0 67/0 51* 39140* 31/2 4* - 200 046 6/28/2002 P 1730 -527 148 460 15 <0 5 4 9 1 1 -- 1,100 0 9 9/16/2002 P 1799 -696 069 510 16 <10 140 140 750 -- K IWproce5sU5 SP AA00W44931Quarterh/+2 OTR 0314493 GW MR2QO3