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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE 00 Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (pg/L) (mg/L) Comments MW-7 9/1/1998 -- 1416 4042 -2626 <50 — <05 <0 5 <0 5 <0 5 <5 _ 12/2/1998 — 1416 3770 -2354 <50 -- <05 <0 5 <0 5 <0 5 <5 -- 3/31/1999 — 1416 3416 -2000 <50 — 1 11 1 06 0 932 273 <5 — 6/4/1999 — 1416 3549 -2133 <50 — <0 5 <05 <05 <05 <5 -- 9/2/1999 — 1416 4002 -2586 <50 - <0 5 <0 5 <0 5 <0 5 <5 11/2911999 — 1416 3821 -2405 <50 -- <05 <0 5 <0 5 <0 5 <2 5 3/16/2000 — 1416 3414 -1998 <50 — <0 5 <05 <0 5 <0 5 <2 5 — 6/26/2000 — 1416 3678 -2262 <50 — <05 <05 <0 5 <0 5 <2[2] — 9/28/2000 -- 1416 4102 -2686 <50 — <05 <05 <0 5 <0 5 <2[2] -- 12/19/2000 -- 1416 3663 -2247 <50 — <05 <0 5 <0 5 <0 5 <2 5 — 3/15/2001 1416 3450 -2034 <50 — <2[4] <2[4] <2[4] <214] <2[2] .. 6/20/2001 — 1416 3779 -2363 <50 — <2[4] <2[4] <2141 <2[4] <2[2] 9/12/2001 — 1416 4200 -2784 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] .. 12/12/2001 — 1416 3885 -2469 <50 -- <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] -- 3/13/2002 — 1416 3593 -2177 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] — 6/18/2002 - 1416 3818 -2402 <50 — <0 50 <050 <0 50 <0 50 <0 50[2] — 9/11/2002 — 1416 4328 -2912 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 12/18/2002 -- 1416 4070 -2654 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 03/06/2003 P 1416 3831 -2415 <50 -- <050 <0 50 <0 50 <0 50 <0 50[2] 456 06111/2003 P 1416 3755 -2339 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] 197 09/23/2003 P 1416 41 57 -2741 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 12/09/2003 P 1416 4075 -2659 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] — 03/09/2004 P 1416 3838 .2422 67 -- <0 50 <0 50 1 <0 50 <050 <0 50[2] 145 06/23/2004 P 1416 4349 -2933 <50 -- 079 <0 50 <0 50 061 <0 50[2] 303 09/20/2004 P 1416 4729 -3313 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] 392 12/20/2004 P 1416 4375 -2959 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] 450 03/28/2005 P 1416 4065 -2649 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] 470 '106/19/2005 P 1416 4099 -2683 <50 -- <050 <0 50 <0 50 <0 50 <0 50[2] 330 MW-8 11/29/1993 — 1416 5886 4440 69 — <05 <0 5 <0 5 <0 5 NA — No FP,No S 3/23/1994 — 1416 5361 3945 340 — 57 66 93 42 NA -- No FP,No S 6/22/1994 — 1416 5375 3959 <10 — <0 3 <03 <0 3 <0 3 NA -- No FP,No S 9/28/1994 — 1416 5741 4325 <50 - <0 5 <0 5 <0 5 <0 5 NA -- No FP,No S 12/1/1994 — 1416 5312 3896 60 — 27 13 0 8 13 NA — No FP,No S Report Date July 27, 2005 Page 15 of 23 I