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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California, 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) (rg/L) ({rg/L) (pg/L) (pg/L) (pg1L) (pg]L) (ug/L) (mg1L) Comments VW-36 5/23/1996 -- 1501 4576 -3075 290 — <0 5 <0 5 <0 5 <0 5 <30 — No FP,No S 9/19/1996 — 1501 5402 -3901 310 -- <0 5 <0 5 <0 5 <0 5 <30 -- No FP, No S 11/2711996 -- 1501 5115 -3614 280 - <05 <05 <0 5 <0 5 <30 — No FP,No S 3/21/1997 — 1501 4249 -2748 180 - <0 5 <05 <0 5 <0 5 <30 -- No FP,No S 5/22/1997 -- 1501 4428 -2927 240 - <0 5 <05 <0 5 <0 5 <30 -- No FP,No S 8/20/1997 — 1501 5021 -3520 200 -- <0 5 <0 5 <0 5 <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 -- 1501 44 72 -2971 93 -- <0 5 <05 <0 5 <0 5 <50 -- No FP,No S 6/24/1998 — 1501 3628 -21 27 <50 — <05 <05 <0 5 <0 5 <50 — No FP No S 9/21/1998 -- 1501 3969 1 -2468 227 456 <0 5 222 324 159 — No FP No S 12/14/1998 -- 1501 3790 -2289 571 <05 <05 <0 5 105 <50 — No FP, No S 3/31/1999 -- 1501 3581 -2080 <50 - <05 <05 <0 5 <0 5 <50 -- No FP,No S 6/11/1999 - 1501 3460 -1959 152 - 1 9 <05 699 16 2 186 — No FP,No S 9/10/1999 -- 1501 3877 -2376 1,210 -- 546 <0 5 545 137 1,590 -- INo FP,No S 12/3/1999 — 1501 3876 -2375 804 — <0 5 <05 <0 5 <0 5 149 No FP,No S 4/3/2000 -- 1501 3545 -2044 <50 -- 338 <0 5 186 562 296 INo FP,No S 6/22/2000 - 1501 3551 1 -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 — <0 5 <0 5 <0 5 <0 5 26 5[4] -- No FP,No S 3116//2001 — 1501 3760 -2269 <50 - <0 5 <0 5 <05 <0 5 9 12[4] — No FP,No S 6/21/2001 1501 4043 -2542 <1,000" -- 97 53 290 750 5,000[4] -- No FP,No S 9/13/2001 -- 1501 4619 -31 18 <50 <05 <0 5 <0 5 <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] -- <050 <0 50 <0 50 <0 50 1,500[4] -- No FP, No S 9/12/2002 — 1501 4960 -3459 320 -- <2 5 <2 5 <2 5 <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 -3150 380 J - <2 5 <2 5 <2 5 <2 5 370[4] 1 06/09/2003 P 1501 4239 -2738 2,600 — <10 <10 <10 <10 6,900[4] 286 09117/2003 P 1501 5162 -3661 110 R — <50 <50 <50 <50 210(4) 188 12/1112003 P 1501 4638 -31 37 16,000 — 1 100 930 1 100 4,300 3,500[4] — 03/10/2004 P 1501 4667 -31 66 76 -- <10 <10 <10 <10 240[4)J 1 94 Report Date August 2,2404 Page 9 of 11