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Table 1 Groundwater Elevation and Analytical Data Former ARCO Service Station No 4493 - 205 N Center Street, Stockton, CA Measured Calc TOC Depth to Ethyl- P! ProductThi GW GRO Benzene Toluene Xylenes MTBE DO Well No Date Elevation Water benzene pH Comments NP ($MSL) (ft BGS) ckness Elev {p91L} (P4�} (N9�} (U91L) iN9�} ip9�1 {m5n.} (feet} (ft MSL) MW-4 11912000 P 1219 1332 -1 13 350 230 <10 3000 150 ?210/1710 1 9!24!1999 NP 1272 -053 4 900 170 <10 260 <10 670 5 2!1611999 14 41 -2 22 15 000 500 ND 710 1 600 10 000 - 3110I1999 1361 142 - - - 6I1711999 1243 0 24 111000 230 18 6000 940 770 - ".611912000 169 NP 1517 -298 7800 260 <10 570 110 1 300 23/28/2000 P 12 83 -064 5,300 300 <20 320 440 5000 1 P 1244 025 2 900 190 <20 220 120 3 790!<2 0' 4 11/30/2000 P 14 44 -225 3 600 2191177' <50 4991389' 39127" 427* 1 9!13/2001 P 1226 -007 1 600 110!79' <10<20* 211<20* 11124" 680' 1 12!3112001 P 1260 -041 <50 <0 5141 0* <0 51<1 0* <0 51<1 0* <0 51<1 0* <0 5* - 311312002 P 1626 4 07 960 27125' <5 010 96• <5 013 5* <5 014 7* 120' 1 612612002 P 1466 -247 510 4 <05 2 8 2 130' 1 911 612 00 2 P 1259 1524 -265 860 6 <2 5 28 280 150' - 12J5/2002 P 1660 -401 1400 23 640 <2 5 1200 140* 0 - 03/1412003 P 1652 -393 2 100 760 19 12 28 180' 1 68 0610912003 P 1583 324 3 900 60 <25 <25 32 130' 1 70 0912512003 P 1611 352 430 <50 <5 0 <5 0 <50 93* 0 69 12!2312003 P 1701 -442 1 600 280 <10 <10 <10 81* 2 80 03108!2004 P 1595 -336 960 56 <50 <50 <50 74* 1 6 8 06/09/2004 P 1605 -346 350 <5 0 <5 0 <5 0 <5 0 75* 1 68 Water levels taken an 60M 09129!2004 P 1734 4 75 450 <50 <50 <5 0 <5 0 61* 1 70 12/21/2004 P 1889 -630 630 <50 <5 0 <50 <50 58 2 71 0310712005 P 1682 -423 800 180 <10 <10 <10 65* 1 7 0 0 611 612 00 5 P 1611 -352 1 800 23 22 8 50 71* 1 71 09109/2005 P 16 20 361 3 000 21 27 <50 57 110* 2 70 1211312005 P 17 98 -539 6100 85 43 14 210 89*J 2 71 03/09/2006 P 1524 -265 2 300 35J 111 <5 0 UJI 44 J 81*J 1 69 4493-Table 1 Page 4 of 12 SECOR