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• i • Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California, Stockton, CA TOC Depth to Water Level Ethyl- Total j Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pgll-) (pg/L) (pg/L) (mgll-) (pg/L) (pg/L) (pg/L) (mg/L) Comments MWA 0311112003 P 1465 4556 -3091 <5,000 - 360 <50 <50 <50 3,200[4] 1 06/09/2003 P 1465 4241 -2776 <2,500 79 <25 <25 <25 10,000[4] 27 09/17/2003 P 1465 5126 -3661 2,300 -- 230 <50 <50 <50 3,600[4] 296 12/1112003 P 1465 4540 -3075 12,000 — 970 860 1,000 3,900 3,200[4]J -- 03/10/2004 P 1465 4571 -3106 2 600 -- <120 <120 <120 <120 6,400[4]J 221 0 611 712 004 P 1462 4802 -3340 16,000 -- 1,100 J 420 1,000 4,000 3,100[4] 09 MW-2 9/25/1995 -- 1549 5901 -4352 <50 — <05 <0 5 <0 5 2 NA — No FP,No S 10/23/1995 — 1549 NM NM NA — NA NA NA NA NA -- Not observed 12/22/1995 -- 1549 5476 -3927 <50 — <05 <0 5 <0 5 <0 5 NA -- No FP,No S 2/16/1996 -- 1549 51 16 -3567 <50 -- <05 <0 5 <0 5 <0 5 NA -- No FP,No S 5/23/1996 -- 1549 4628 -3079 <50 - <0 5 <0 5 <0 5 <05 NA -- No FP,No S 9/19/1996 — 1549 5453 -3904 <50 -- <0 5 1 <05 <0 5 <0 5 <30 — INo FP,No S 11/27/1996 -- 1549 51 67 -3618 <50 -- <0 5 <05 <0 5 <0 5 <3 0 -- INo FP,No S 3/21/1997 — 1549 4316 -2767 <50 — <0 5 <0 5 <0 5 <0 5 <30 - jNo FP,No S 5/22/1997 — 1549 4481 -2932 <50 -- <05 <0 5 <05 <0 5 <30 -- No FP,No S 8/20/1997 -- 1549 5071 -3522 <50 - <05 <0 5 <0 5 <0 5 <30 — No FP,No S 11/20/1997 — 1549 5017 -3468 <50 -- <05 <0 5 <0 5 <0 5 <50 -- No FP,No S 2/17/1998 -- 1549 4530 -2981 <50 — <0 5 <05 <0 5 <0 5 <50 — No FP,No S 6/24/1998 -- 1549 3669 -21 20 <50 - <0 5 <0 5 <0 5 <0 5 <50 — No FP,No S 9/21/1998 - `15 49 4031 -2482 <50 <05 <05 <0 5 <05 <50 -- No FP,No S 12/14/1998 — 1549 3828 -2279 <50 -- <0 5 <05 <0 5 <0 5 <50 -- No FP,No S 3/3111999 -- 1549 3524 -1975 <50 — <05 0 781 <0 5 <0 5 <50 — No FP,No S 6/11/1999 — 1549 3514 -1965 <50 -- <0 5 <0 5 <0 5 0 796 <50 -- No FP,No S 9/10/1999 -- 1549 3937 -2388 <50 <05 <0 5 <0 5 <05 <50 — No FP,No S 12/3/1999 1549 3933 -2384 <50 -- <05 <0 5 <0 5 <0 5 <25 -- No FP,No S 4/3/2000 1549 3590 -2041 <50 <05 <0 5 <0 5 <0 5 <2 5 No FP,No S 6/22/2000 -- 1549 3608 -2059 <50 <20 <2 0 <20 216 <2 0[4] No FP,No S 9/27/2000 - 1549 41 38 -2589 <50 -- <0 5 <0 5 <0 5 <0 5 <2 0[4] - No FP,No S 10/19/2000 - 1549 4120 -2571 NA — NA NA NA NA NA -- Not observed 12/20/2000 - 1549 3923 -2374 <50 — <0 5 <05 <0 5 <0 5 <2 5 — No FP,No S 3/16/2001 1549 3814 -2265 <50 — <0 5 <0 5 <0 5 <0 5 <2 0[4] -- No FP,No S 6/21/2001 — 1549 4094 -2545 <50 -- <05 <0 5 <05 <0 5 <2 0[4] — No FP,No S 9/1312001 - 1549 4669 -3120 <50 - <0 5 <05 <05 <0 5 <2 0141 — No FP,No S Report Date August 2, 2004 Page 2 of 11