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• Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes Mt9E DO Number Sampled NP (feet mal) (feet bgs) (feet msl) (pg/L) Wg/L) WIL) (pglL) (pg1L) (pgIL) (pg1L) (mg/L) Comments VW-38 5/22/1997 -- 1501 4428 -2927 240 — <0 5 <05 <0 5 <0 5 <3 0 — No FP,No S 8/20/1997 — 1501 5021 -3520 200 — <05 <05 <05 <0 5 <50 -- No FP,No S 11/20/1997 — 1501 4946 -3445 160 — 46 44 26 67 <50 — No FP,No S 2/17/1998 — 15 01 4472 -2971 93 -- <05 <05 <0 5 <0 5 <50 — No FP,No S 6/24/1998 — 15 01 3628 -2127 <50 — <0 5 <05 <0 5 <0 5 <50 -- No FP,No S 9/21/1998 - 15 01 3969 -2468 227 -- 4 56 <0 5 222 324 159 — No FP,No S 12/14/1998 — 1501 3790 -2289 571 — <0 5 <0 5 <0 5 105 <50 — No FP,No S 3/31/1999 -- 1501 3581 -2080 <50 » <0 5 <0 5 <0 5 <0 5 <50 — No FP,No S 6/11/1999 -- 1501 3460 -1959 152 » 19 <05 699 162 186 — No FP,No S 9/10/1999 -- 1501 3877 -2376 1,210 -- 546 <0 5 545 137 1,590 — No FP,No S 12/3/1999 — 1501 3876 -2375 804 — <05 <05 <05 <0 5 149 — No FP,No S 4/3/2000 - 15 01 3545 -2044 <50 -- 338 <05 186 562 296 — No FP,No S 6/22/2000 -- 1501 3551 -2050 1,690 — 848 384 227 432 3,180[4] -- No FP,No S 9/27/2000 — 1501 4081 -2580 NS — NS NS NS NS NS — No FP,No S 10/19/2000 — 1501 4064 -2563 NS — NS NS NS NS NS — No FP,No S 12/20/2000 - 1501 3871 -2370 <50 -- <05 <05 <05 <0 5 26 5[4] — No FP,No S 3/16/2001 -- 1501 3760 -22 59 <50 — <05 <0 5 <05 <0 5 912[4] — No FP,No S 6/21/2001 — 11501 4043 -2542 <1,000" — 97 53 290 750 5,000(4] — No FP,No S 9/13/2001 — 1501 4619 -3118 <50 -- <05 <0 5 <05 <0 5 90[4] -- [8],No FP,No S 12/11/2001 -- 1501 4341 -2840 <50 — <0 50 <0 50 <0 50 <0 50 200[4] — No FP,No S 3/14/2002 — 1501 4037 -2536 <50 — <050 <050 <0 50 <0 50 26[4] — No FP,No S 6/19/2002 » 1501 4271 -2770 460[7] — <0 50 <0 50 <0 50 <0 50 1,500[4] — No FP,No S 9/12/2002 — 1501 4960 -3459 320 — <2 5 <25 <25 <2 5 140 — No FP,No S 12/3/2002 - 1501 4660 -31 59 <500 — <50 <50 <50 <50 69 -- No FP,No S 03/11/2003 P 1501 4651 -31 50 380 J — <25 <2 5 <25 <2 5 370[4] 095 06/09/2003 P 1501 4239 -2738 2 600 — <10 <10 <10 <10 6,900[4] 286 09/17/2003 P 1501 51 62 -3661 110 R — <50 <50 <50 <50 210141 1 88 12/11/2003 P 1501 4638 -31 37 16,000 — 1 100 930 1,100 4,300 3,500[4] — 03/10/2004 P 1501 4667 -3166 76 — <10 <10 <10 <10 240[4]J 1 94 06/17/2004 P 1398 4843 -34 45 <50 -- <25 <2 5 <2 5 <2 5 180[4] 09 09/23/2004 P 1398 5455 -4057 94 — 18 19 061 12 45[4] 12 112/21/2004 P 13 98 4906 .3508 320 -- <12 <12 <12 66 250[4] 1 3i VW-4 06/17/2004 -- 1471 1 -- INot Sampled,Well pry Report Date January 18,2005 Page 10 of 12 I