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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) (ug1L) (pgIL) (ugIL) (Erg1L) (ugll-) (pg/L) (pg/L) (mg1L) I Comments MW-2 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 <0 50 <0 50 <0 50 2 0[4] No FP,No S 9/12/2002 - 1549 5015 -3466 <50 — <0 5 <0 5 <0 5 <0 5 <0 5 No FP,No S 12/3/2002 — 1549 4717 -31 68 <50 - 064 0 54 081 25 068 INo FP,No S 03111/2003 P 1549 4701 -3152 <50 — <0 50 <0 50 <0 50 <0 50 0 57[4] 09 06/09/2003 P 1549 44 36 -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 -31 35 <50 -- 0 85 <0 50 <0 50 064 0 57[4] -- 03/10/2004 P 1549 4717 -3168 <50 <0 50 <0 50 <0 50 <0 50 <0 50[4] 304 06/17/2004 P 1550 4891 -3341 <50 -- <0 50 <0 50 <0 50 055 1 <0 50[4] 1 1 MW-3 9/25/1995 — 1455 5790 -4335 <50 — <05 <0 5 <0 5 <0 5 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 — <05 <0 5 <0 5 <0 5 NA -- No FP,No S 2/16/1996 -- 1455 4999 -3544 <50 -- <0 5 <0 5 <0 5 <0 5 NA — No FP No S 5/23/1996 — 1455 4519 -3064 <50 <0 5 <0 5 <0 5 <0 5 <30 — No FP,No S 9/19/1996 1455 5326 -3871 <50 — <0 5 <0 5 <0 5 <0 5 <30 -- No FP No S 11/27/1996 — 1455 5051 -3596 <50 — <0 5 <0 5 <0 5 <0 5 <3 0 — No FP, No S 3/21/1997 — 1455 41 97 -2742 <50 -- <0 5 <0 5 <0 5 <0 5 <30 No FP No S 5/22/1997 -- 1455 4361 -2906 <50 - <0 5 <0 5 <0 5 <0 5 <3 0 -- No FP,No S 8/20/1997 - 14 55 4943 -3488 <50 -- <0 5 <0 5 <0 5 <0 5 <50 — No FP, No S 11/20/1997 — 1455 4882 -34 27 <50 -- <0 5 <0 5 <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 -- 14 55 3559 -21 04 <50 — <0 5 <0 5 <0 5 <0 5 <50 - No FP No S 9/21/1998 14 55 3907 -2452 <50 -- <0 5 <0 5 <0 5 <0 5 <50 -- No FP,No S 12/14/1998 - 1455 3714 -2259 <50 -- <0 5 <0 5 <0 5 <0 5 <50 -- No FP No S 3/31/1999 — 1455 3422 -1967 <50 -- <0 5 <0 5 <0 5 <0 5 <50 -- No FP,No S 6/11/1999 -- 1455 3401 -1946 <50 — <05 <0 5 <0 5 <0 5 <50 — No FP,No S 9/10/1999 — 1455 3810 -2355 <50 — <05 <0 5 <0 5 <0 5 <50 -- No FP, No S 12/3/1999 - 1455 3812 -2357 <50 <05 <0 5 <0 5 <0 5 <2 5 — No FP, No S 4/3/2000 1465 34 85 -2030 <50 <0 5 <0 5 <0 5 <0 5 <50 - No FP, No S 6122/2006 -- 1455 1 34 90 1 -2035 <50 — <20 <2 0 <2 0 <2 0 <2 0[4] — No FP,No S 9/2712000 - 1455 1 4007 1 -25 52 <50 -- <05 <0 5 1 <0 5 <0 5 4 98[41 -- INo FP No S Report Date August 2,2004 Page 3 of 11