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I Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tracy Blvd,Tracy, 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) (,ug/L) (pg1L) Wg/L) (Ug1L) (pg/L) (pg1L) (pg/L) (mg/L) Comments ATR-2 10/26/1995 - 4922 1226 3696 <50 - <05 <05 <0 5 <0 5 — — 2l1211996 — 4922 1140 3782 <50 -- <0 5 <0 5 <0 5 <0 5 -- — 4/18/1996 — 4922 1190 3732 <250 <2 5 <25 <2 5 <2 5 — - 7/18/1996 -- 4922 1210 3712 <50 - <05 <0 5 <0 5 <0 5 500 — 11/15/1996 - 4922 1270 3652 <50 — <0 5 <0 5 <0 5 <05 750 — 3/14/1997 P 49 22 12 70 36 52 <5Q -- <0 5 <0 5 <0 5 <0 5 280 008 6/4/1997 NP 1 4922 1202 3720 <50 - 064 <05 <0 5 <0 5 480 006 8/11/1997 P 4922 1233 3689 <50 -- <0 5 <0 5 <0 5 <05 440 — 11/17/1997 P 4922 1226 3696 <50 - <0 5 <05 <0 5 <0 5 98 -- 3/30/1998 NP 49 22 11 82 37 40 <50 - <0 5 <0 5 <0 5 <0 5 18120" 12 6/25/1998 NP 4922 1205 3717 <50 - <0 5 <0 5 <0 5 <05 109 1 6 9/11/1998 NP 49 22 1212 3710 <50 -- <05 <05 <0 5 <0 5 250 167 1 2/1 511 998 NP 4922 1201 37 21 <50 — <0 5 <0 5 <0 5 <0 5 <50 1 5 3/17/1999 NP 49 22 1165 3757 <50 -- <0 5 <05 <0 5 <0 5 <50 23 --5114/1999 NP 49 22 1205 3717 <50 — <05 <0 5 <0 5 <0 5 <50 19 --6/1611999 NP 4922 1223 3699 <50 - <0 5 <05 <0 5 <0 5 <50 37 12/2211999 NP 49 22 1214 37 08 <50 — <0 5 <0 5 <0 5 <0 5 <2 50 7 43 2/29/2000 NP 49 22 11 50 37 72 <50 - <0 5 <0 5 <0 5 <05 4 83 51 6!112000 NP 49 22 12 11 37 11 <50 — <0 5 <0 5 <0 5 <0 5 126 -- 9/25/2000 NP 49 22 12 11 3711 <50 — <0 5 <0 5 <0 5 <0 5 141 03 12/29!2000 P 49 22 12 03 37 19 <50 0 — <0 500 <0 500 <0 500 <0 500 89" 56 3/27/2001 P 4922 1192 37 30 <50 0 — <0 500 <0 500 <0 500 <0 500 37 2* 41 6/20/2001 P 49 22 12 03 3719 <50 -- <0 50 <0 50 <0 50 <0 50 96* — 9/12/2001 P 4922 1218 3704 <500 <5 0 <50 <5 0 <5 0 500 29 12/19/2001 P 4922 1197 3725 <500 — <50 <50 <50 <50 250* 082 3/1412002 P 4922 1200 3722 <500 _ <5 0 <50 <5 0 <50 98* 082 6/28/2002 P 49 22 1212 37 10 170 <0 5 <0 5 <0 5 <0 5 300' 1 5 911112Q02 P 49 22 12 10 3712 54 — <0 5 <0 5 <0 5 <0 5 110* 1 9 12/17/2002 P 4922 1144 3778 <50 -- <0 5 <0 5 <0 5 <0 5 16' 14 03/31/2003 P 4922 1220 3702 <50 — <0 50 <0 50 <0 50 <0 50 50* 14 06/09/2003 P 49 22 11 92 37 30 <50 -- <D 50 <0 50 <0 50 <0 50 5 4" 17 09/18/20031 P 1 4922 1 11 99 3723 <50 -- <0 50 <0 50 <050 <0 50 94' 1 9 t--11M41200,31 P j 4922 1 11 86 37 36 <50 — <0 50 <0 S0 <0 50 <0 50 1 14' 23 Page 4 of 27 Report Date October 14,2004