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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 PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msI) (feet bgs) (feet msl) (pg1L) (pg/L) (pglL) (ug1L) (,vg/L) (pg1L) (pg/L) (mg1L) Comments MW-2 92/20/2000 -- 1549 3923 -2374 <50 — <0 5 <0 5 <0 5 <0 5 <25 -- No FP,No S 3/16/2001 -- 15 49 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 — <0 5 <0 5 <05 <0 5 <2 0[4] — No FP,No S 9/13/2001 -- 1549 4669 -3120 <50 -- <0 5 <0 5 <0 5 <0 5 <2 0[4] — INo FP,No S 12/11/2001 -- 1549 4400 -2851 <50 -- <0 50 <0 50 <0 50 <0 50 2 2[4] — No FP,No S 3/14/2002 -- 1549 4090 -2541 <50 — <0 50 <0 50 <0 50 <0 50 1 9[4] -- No FP,No S 6/19/2002 -- 1549 4311 -2762 <50 — <0 50 <050 <0 50 <0 50 2 0[41 -- No FP,No S 9/12/2002 -- 1549 5015 -3466 <50 -- <0 5 <0 5 <0 5 <05 <05 -- No FP,No S 12/3/2002 — 1549 4717 -3168 <50 -- 064 054 081 25 068 — No FP,No S 03/11/2003 P 1549 4701 -3152 <50 -- <0 50 <0 50 <0 50 <0 50 0 57[4] 089 06/09/2003 P 1549 4436 -2887 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 386 09/16/2003 P 1549 5215 -3666 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 301 12/11/2003 P 1549 4684 -3135 <50 — 085 <0 50 <0 50 064 057141 — 03/10/2004 P 1549 4717 -3168 <50 -- <0 50 <050 <0 50 <0 50 <0 50[4] 304 06/17/2004 P 1550 4891 -3341 <50 — <0 50 <0 50 <0 50 055 <0 50[4] 110 09/23/2004 P 1550 5510 -3960 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 210 12/21/2004 P 1550 5000 -3450 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 316 03/30/2005 P 1550 4556 -3006 <50 -- <0 50 <0 50 <0 50 093 <0 50[4] 379 06/1312005 P 1550 4360 -2810 <50 -- <0 50 <0 50 <0 50 050 <0 50[4] 157 MW-3 9/25/1995 — 1455 5790 -4335 <50 — <0 5 <0 5 <0 5 <05 NA -- No FP,No S 10/23/1995 -- 1455 NM NM NA -- NA NA NA NA NA — Not observed 12/22/1995 — 1455 5359 -3904 <50 — <0 5 <0 5 <0 5 <0 5 NA — No FP,No S 2/16/1996 -- 1455 4999 -3544 <50 -- <05 <0 5 <0 5 <0 5 NA — No FP,No S 5/23/1996 -- 1455 4519 -3064 <50 - <0 5 <05 <0 5 <0 5 <3 0 -- No FP,No S 9/19/1996 — 1455 5326 -3871 <50 — <0 5 <05 <0 5 <0 5 <30 -- No FP,No S 11/27/1996 -- 1455 5051 -3596 <50 -- <0 5 <05 <0 5 <0 5 <30 -- No FP,No S 3/21/1997 -- 1455 4197 -2742 <50 — <0 5 <05 <0 5 <0 5 <30 -- No FP,No S 5/22/1997 — 1455 4361 -2906 <50 — <0 5 <05 <0 5 <0 5 <30 -- No FP,No S 8/20/1997 -- 1455 4943 -3488 <50 — <0 5 <05 <0 5 <0 5 <50 -- No FP,No S 11/20/1997 -- 1455 4882 -3427 <50 — <0 5 <05 <0 5 <0 5 <50 -- No FP,No S 2/17/1998 -- 1455 4418 -2963 <50 -- <0 5 <05 <0 5 <0 5 <50 — No FP No S 6/24/1998 -- 1455 3559 -2104 <50 <0 5 <05 <0 5 1 <0 5 <50 — INo FP,No S 9121/1998 — 1455 39 07 .2452 <50 — <0 5 <0 5 <0 5 <05 <50 -- INo FP,No S Report Date July 21,2005 Page 3 of 13