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irE Table 1 Groundwater Elevation and Analytical Data Former ARCO Service Station No 4493 205 N Center Street, Stockton, CA TOG Depth to Water Level Ethyl- Total Well Date Pl Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtSE DO Dumber Sampled NP (feet msl) (feet bgs) (feet msl) (pg1L) (pg1L) (pg/L) (/uglL) (/ug/L) (/ug1L) (uglL) (mg/L) Comments MW-8M 12/5/2002 P 1276 1866 -590 <50 — <05 0 5 63 14 <0 5* 28 03/14/2003 P 12 76 1858 -582 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 37 06/09/2003 P 1276 1827 -551 <50 -- 17 J <1 0 UJ <1 0 UJ <1 0 UJ 3 7*J 57 09/25/2003 P 1276 1905 -629 640 -- 46 40 21 42 17* 21 12/24/2003 P 1276 1939 -663 1,600 -- 62 71 70 25 27* 21 03/0812004 P 1276 1826 -550 570 -- 40 <1 0 <1 0 <1 0 21* 21 MW-91) 6/12/2002 P 1300 1643 -345 460 -- 27 4 6 69 7 4 22* — 9/16/2002 P 1300 1705 -407 140 -- 57 <1 0 <1 0 <1 0 50* -- 1215/2002 P 1300 1826 -528 86 — 24 <1 0 <1 0 <1 0 15* 2 03/14/2003 P 1300 1 1828 -528 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 44 06/09/2003 P 1300 1763 -463 <50 — <10 <1 0 <1 0 <1 0 <1 0* 45 09/25/2003 P 1300 1832 -532 <50 -- <1 0 <1 0 <1 0 <1 0 <1 0* 18 12/23/2003 P 1300 1868 -568 <50 — <10 <1 0 <1 0 <1 0 <1 0* 48 0310812004 P 1300 1765 -465 <50 -- <1 0 <1 0 <1 0 <1 0 <10* 43 MW-9M 6/12/2002 P 1298 1924 -624 770 -- 37 77 110 94 44* -- 9/16/2002 P 1298 1692 -392 50 - 27 <1 0 24 <1 0 56* — 12/5/2002 P 1298 1825 -525 <50 — <05 <0 5 <0 5 <05 2 4* 21 03/14/2003 P 1298 1854 -556 <50 — <0 50 <0 50 <0 50 <0 50 0 63* 4 0 06/09/2003 P 12 98 1746 -448 <50 — <1 0 <1 0 <1 0 <1 0 1 1* 24 09/25/2003 P 1298 1855 -557 <50 -- <1 0 <1 0 <1 0 <1 0 21* 1 0 12!2312003 P 1298 1863 -565 <50 -- <1 0 <1 0 <1 0 <1 0 2 0* 37 03/08/2004 P 1298 1754 -456 <50 _ <1 0 <1 0 <1 0 <1 0 2 8* 36 MW-101) 6/12/2002 NP 1064 1421 -357 87 — 19 <0 5 <0 5 <0 5 31* — 9/16/2002 NP 1064 1465 -401 <50 -- <05 <0 5 <0 5 <0 5 1 6* -- 12/512002 P 1064 1596 -532 <50 -- <0 5 <0 5 1 1 <0 5 1. 23 03/14/2003 P 1064 1589 -525 <50 — <0 50 <0 50 <0 50 <0 50 0 64* 10 06/09/2003 P 1064 1535 -471 <50 -- <1 0 <1 0 <1 0 <1 0 <1 0* 14 09/25/2003 P 1064 1566 -502 <50 -- <10 <1 0 <1 0 <1 0 <1 0* 14 12/23/2003 P 1064 1633 -569 <50 — <10 <1 0 <1 0 <1 0 <1 0* 29 03108/2004 P 1064 1544 -480 <50 -- <1 0 <1 0 <1 0 <1 0 <10* 27 MW-10M 6/12/2002 P 1076 14 93 -417 430 -- 12 087 <0 50 12 58* -- 9/16/2002 P 1076 1481 4 05 <50 -- <10 <1 0 <1 0 <1 0 2 6* 1 -- 12/5/2002 P 1076 1602 -526 <50 — <1 0 <1 0 <1 0 <1 0 <1 0* 1 5 Report Date May 10,2004 Page 5 of 7