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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 MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg1L) Comments MW-1 03/11/2003 P 1465 4556 -3091 <5 000 -- 360 <50 <50 <50 3,200[4] 097 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 12111/2003 P 14 65 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 06/17/2004 P 1462 4802 -3340 16,000 -- 1 100 J 420 1,000 4,000 3 100[4] 09 09/23/2004 P 1462 5435 -3973 1,400 -- 75 42 84 220 80[4] 01 12/21/2004 P 1462 4880 -3418 3 800 — 220 <12 220 790 340[4] 103 03130/2005 P 1462 44 65 -3003 6,200 -- 460 15 510 1,900 880[4] 199 MW-2 9/25/1995 — 1549 5901 -4352 <50 -- <0 5 <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 — <0 5 <0 5 <0 5 <0 5 NA -- No FP, No S 2/16/1996 — 1549 51 16 -3567 <50 -- <05 <0 5 <0 5 <05 NA — No FP,No S 5/23/1996 -- 15 49 4628 -3079 <50 <05 <0 5 <05 <0 5NA -- No FP,No S 9/19/1996 -- 1549 5453 -3904 <50 -- <0 5 <05 <05 <0 5 <30 — INo FP,No S 11/2711996 — 1549 5167 -3618 <50 — <0 5 <05 <0 5 <05 <3 0 — No FP,No S 3/21/1997 — 1549 4316 -2767 <50 — <05 <05 <05 <0 5 <30 -- No FP No S 5/22/1997 — 1549 4481 -2932 <50 - <0 5 <05 <0 5 <0 5 <3 0 -- No FP,No S 8/20/1997 — 1549 5071 -35 22 <50 — <05 <05 <0 5 <0 5 <3 0 — No FP,No S 11/20/1997 - 1549 5017 -3468 <50 — <0 5 <05 <0 5 <05 <50 -- No FP,No S 2/17/1998 — 1549 4530 -2981 <50 — <0 5 <05 <05 <05 <50 -- No FP,No S 6/24/1998 — 1549 3669 -2120 <50 - <0 5 <05 <05 <0 5 <50 -- No FP,No S 9/21/1998 - 1549 4031 -2482 <50 -- <0 5 <05 <0 5 <0 5 <50 -- No FP,No S 12/14/1998 -- 1549 3828 -2279 <50 -- <0 5 <0 5 <0 5 <0 5 <50 — No FP,No S 3/31/1999 -- 1549 3524 -1975 <50 — <0 5 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 <0 5 <50 — No FP, No S 12/3/1999 1549 3933 -2384 <50 -- <0 5 <0 5 <0 5 <0 5 <2 5 — No FP,No S 413/2000 -- 1549 3590 -2041 <50 -- <05 <05 <05 <0 5 <2 5 — No FP,No S 6/22/2000 — 1549 3608 -2059 <50 -- <2 0 <20 <20 216 <2 0[4] -- No FP, No S 9/27/2000 — 1549 4138 -2589 <50 -- <05 <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 1 3923 1 -2374 1 <50 — <05 1 <0 5 1 <0 5 <0 5 <2 5 -- No FP No S Report Date April 25, 2005 Page 2 of 12