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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 msl) (feet bgs) (feet msl) (pg1L) (pglL) (pglL) (pg1L) (pg1L) (pg/L) (Pg/L) (mg1L) Comments MW-3 6/11/1999 — 1455 3401 -1946 <50 — <05 <05 <0 5 <0 5 <50 -- No FP,No S 9/10/1999 1455 3810 -2355 <50 -- <05 <05 <0 5 <0 5 <50 -- No FP,No S 12/3/1999 — 1455 3812 .2357 <50 — <05 <05 <0 5 <0 5 <25 -- No FP No S 4/3/2000 1455 3485 -2030 <50 — <0 5 <05 <0 5 <0 5 <50 -- No FP,No S 6/22/2000 -- 1455 3490 -2035 <50 -- <20 <20 <2 0 <2 0 <2 0[4] -- No FP,No S 9/27/2000 1455 4007 -2552 <50 <0 5 <05 <0 5 <0 5 4 98[4] -- No FP,No S 10/19/2000 — 14 55 3996 -2541 NA — NA NA NA NA NA — Not observed 12/20/2000 -- 1455 3811 -2356 <50 -- <05 <05 <0 5 <0 5 <25 — No FP,No S 3/16/2001 -- 1455 3703 -2248 <50 - <05 <05 <0 5 <0 5 <2 0(4] -- No FP,No S 6/21/2001 -- 1455 3970 -2515 <50 -- <05 <05 <0 5 <0 5 <2 0[4] -- No FP,No S 9/13/2001 — 1455 4540 -3085 <50 — <0 5 <0 5 <0 5 <0 5 <2 0[4] -- No FP,No S 12/11/2001 -- 1455 4281 -2826 <50 -- <0 50 <0 50 <050 <0 50 <2 0[4] -- No FP,No S 3/14/2002 — 1455 3976 -2521 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] — No FP,No S 6/19/2002 -- 1455 4197 -2742 <50 -- <050 <0 50 <0 50 <0 50 <0 50[4] — No FP,No S 9/12/2002 — 1455 4878 -3423 <50 -- <0 5 <05 <0 5 <0 5 <05 — No FP,No S 12/3/2002 -- 1455 4597 -3142 <50 -- <0 5 <05 <0 5 <0 5 <05 -- No FP,No S 03/11/2003 P 1455 4639 -3184 <50 — <0 50 <0 50 <0 50 <050 <0 50[4] 096 06/09/2003 P 1455 4318 -2863 <50 — <0 50 <0 50 <050 <0 50 <0 50[4] 38 09116/2003 P 1455 5086 -3631 <50 -- <0 50 <0 50 <050 <0 50 <0 50[4] 148 12/11/2003 P 1455 4620 -3165 <50 — <0 50 <0 50 <050 084 0 81[4] -- 03/10/2004 P 1455 4654 -3199 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 196 06/17/2004 P 1453 4762 -3309 <50 — <0 50 <0 54 <0 50 <0 50 <0 50[4] 25 09/23/2004 P 14 53 5385 -3932 <50 - <0 50 <050 <0 50 <050 <0 50[4] 46 12/21/2004 P 1453 4862 -3409 <50 - <0 50 <0 50 <050 <0 50 <0 50[4] 42 03130/2005 P 1 1453 1 4445 1 -2992 1 <50 -- <0 50 <0 50 <0 50 <0 50 <0.50[41 586 MW-4 11120/1997 -- 1383 4836 -3453 89 — 1 11 063 2 11 -- No FP,No S 2/17/1998 — '13 83 4355 -2972 180 — 057 <0 5 <0 5 059 29 — No FP,No S 6/24/1998 -- 1383 3506 -2123 <50 — <05 <0 5 <05 <0 5 162 No FP, No S 9/21/1998 1383 3867 -2484 131 — <0 5 <0 5 1 15 167 262 -- No FP,No S 12/14/1998 - 1383 3661 -2278 1 136 -- 108 <0 5 <0 5 <0 5 291 — No FP,No S 3/31/1999 1383 3385 -2002 <50 -- <0 5 <0 5 <0 5 <0 5 796 — No FP,No S 6/11/1999 - 1383 3347 -1964 194 - <05 <05 <0 5 <0 5 41 — No FP,No S 9/10/1999 — 1383 3772 -2389 213 -- 148 <05 <0 5 <0 5 1,100 -- No FP,No S Report Date April 25, 2005 Page 4 of 12