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Table 1 Groundwater Elevation and Analytical Data Former ARCO Service Station No 4493 205 N Center Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) W/L) W/L) (Erg/L) Wg/L) WIL) WgIL) W/L) (mglL) Comments MW-4 6/19/2000 P 1219 1244 -025 2,860 -- 186 <20 223 123 3,790/<2 0* 382 9/19/2000 P 1219 1332 -1 13 3,460 -- 234 <10 300 150 2,21011,710* 08 11/30/2000 P 1219 1444 -225 3,640 — 219/177* <50 4991389* 39127* 427* 073 9/13/2001 P 1219 1226 -007 1,600 — 110179* <10<20* 211<20* 11124* 680* 072 12/31/2001 P 1219 1260 -041 <50 — <0 5/<1 0* <0 51<1 0* <0 51<l 0* <0 5/<1 0* <0 5* — 3/13/2002 P 1219 1626 -407 960 -- 27/25* <5 010 96* <5 013 5* <5 014 7* 120* 098 6/28/2002 P 1219 1466 -247 510 — 42 <05 28 19 130* 1 2 9/16/2002 P 1259 1524 -265 860 — 61 <25 28 28 150* -- 12/5/2002 P 1259 1660 -401 1,400 — 23 64 <2 5 12 140* 0 03/14/2003 P 1259 1652 -393 2,100 76 19 12 28 180* 1 0 06/09/2003 P 1259 1583 -324 3,900 -- 60 <25 <25 32 130* 090 09/25/2003 P 1259 1611 -352 430 — <50 <50 <5 0 <50 93* 030 12/2312003 P 1259 1701 -442 1,600 — 28 <10 <10 <10 81* 1 8 03/08/2004 P 1259 1595 -336 960 56 <50 <50 <50 74* 090 MW-5 6/19/2000 P 1203 1298 -095 <50 — 275 <05 <0 5 <05 <2 50/<2 0* 209 9/19/2000 P 1203 1365 -162 <50 - 119 <05 <0 5 <05 <2 501<2 0* 06 11/30/2000 P 1203 1488 -285 <50 0 - 0 694 <0 5 <0 5 <0 5 <2 0* 121 9/13/2001 P 1203 1598 -395 <50 — <0 51<2 0* <0 5/<2 0* <0 51<2 0* <0 5/<2 0* <2 0* 088 12/31/2001 P 1203 NS — 54[2] — 7 2115 9* <0 5/<1 0* 1 5110* <0 5/<1 0* 60* -- 3/13/2002 P 1203 1878 -675 370 — 32/27* 0 6710 51* 39140* 3 112 4* 200* 046 6/28/2002 P 1203 1730 -527 460 — 15 <0 5 49 1 1 1,100* 09 9/16/2002 P 1203 1799 -596 510 16 <10 140 140 750* — 12/5/2002 P 1443 1928 -485 510 — 14 <10 19 17 180* 13 03/14/2003 P 1443 1925 -482 380 — 35 <2 5 <2 5 <2 5 190* 50 06/09/2003 P 1443 1858 -415 140 R -- <5 0 UJ <5 0 UJ <5 0 UJ <5 0 UJ 130*J 090 09/25/2003 P 1443 18 98 -455 <50 — <20 <2 0 <20 <20 49* 13 12/23/2003 P 1443 1980 -537 82 -- <50 <50 <50 <50 26* 1 1 03108/2004 P 1443 1871 -428 88 -- <50 <50 <50 <50 58* 12 MW-6 6/19/2000 P 1326 1381 -055 <50 -- 1 87 <0 5 0 523 234 1711144* 183 9/19/2000 P 1326 1456 -130 <50 — 13 <0 5 <0 5 <0 5 1191102* 07 11/30/2000 P 1326 1579 -253 <50 -- <05 <0 512 08* <0 5 <0 5/8 0* 412* 064 9/13/2001 P 1326 1360 -034 <50 -- <0 51<2 0* <0 51<2 0* <0 5/<2 0* <0 5/<2 0* <2 0* 078 12/31/2001 P 1326 1463 -137 <50 — <0 5K1 0* <0 51<1 0* <0 51<1 0* <0 5/ Report Date May 10,2004 Page 3 of 7