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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) (pg1L) (pg1L) (pg1L) (pg1L) (pg/L) (pg/L) W91L) (mglL) Comments MW-3 6/24/1998 - 1455 3559 -2104 <50 <0 5 <0 5 <05 <0 5 <50 — No FP,No S 9/21/1998 -- 1455 3907 -2452 <50 — <0 5 <0 5 <05 <05 <50 -- No FP,No S 12/14/1998 — 14 55 3714 -2259 <50 -- <0 5 <0 5 <05 <05 <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 -- <0 5 <0 5 <05 <05 <50 — No FP,No S 9/10/1999 -- 1455 3810 -2355 <50 — <05 <05 <0 5 <0 5 <50 — No FP,No S 1213!1999 — 1455 3812 -2357 <50 -- <0 5 <05 <0 5 <0 5 <25 -- No FP,No S 413!2000 -- 1455 3485 -2030 <50 — <0 5 <05 <0 5 <0 5 <50 — No FP,No S 6122/2000 - 1455 3490 -2035 _ ,_ <50 -- <20 <2 0 <2 0 <2 0 F- <2 0[4] -- No FP,No S S' 9/27/2000 — 14 55 4007 -2552-- <50 -- <05 <05 <0 5 <0 5 _ 4 98[4] -- No FP No S 10/19/2000 — 1455 3996 -2541 NA -- NA NA NA NA NA — Not observed 12/20/2000 -- 1455 3811 -2356 <50 - <05 <0 5 <0 5 <0 5 <2 5 -- No FP,No S 3/16/2001 — 1455 3703 -2248 <50 - <05 <0 5 <0 5 <0 5 <2 0[4] -- No FP,No S 6/21/2001 — 1455 3970 -2515 <50 -- <05 <0 5 <0 5 <0 5 <2 0[4] — No FP,No S 9/13/2001 -- 1455 4540 -3085 <50 — <05 <05 <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 — <0 50 <0 50 <0 50 <0 50 <0 50[4] — No FP No S 9/12/2002 -- 1455 4878 -3423 <50 -- <0 5 <0 5 <05 <0 5 <4 5 — No FP,No S 12/3/2002 - 1455 4597 -3142 <50 -- <0 5 <0 5 <05 <0 5 <0 5 — No FP No S 03/11/2003 P 1455 4639 -3184 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 096 06/09/2003 P 1455 4318 -2863 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] 380 09116/2003 P 1455 5086 -3631 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 148 12/11/2003 P 1455 4620 -3165 <50 — <050 <0 50 <0 50 084 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 50 <0 50 <0 50 <0 50[4] 250 09/23/2004 P 1453 5385 -3932 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] 460 12/21/2004 P 14 53 4862 -3409 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 420 03/30/2005 P 1453 4445 -2992 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 586 06113/2005 P 14 53 4245 -2792 <50 — <0 50 <0 50 <0 50 050 <0 50[4] 349 09/0812005 P 1453 1 4858 1 -3405 1 <50 — <0 50 1 <0 50 1 <0 50 1 <0 50 1 <0 50[4] 1 459 MW-4 11/20/1997 — 1383 4836 -34 53 89 — 1 1 1 063 2 11 INo FP,No S 2117/1998 — 1383 4355 -2972 180 -- 057 <0 5 <0 5 059 29 INo FP,No S Report Date October 17,2005 Page 4 of 13