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s • • 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 P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (,pg/L) (mg/L) Comments SMW-1 10!711994 -- 5024 1286 3738 2,200 -- 250 110 <0 5 360 — — 12/16/1994 -- 5024 1254 3770 5,200 — 740 210 330 600 -- — ! 2/28/1995 — 5024 1240 37 84 8,300 -- 1,000 330 450 790 — - 4/26/1995 — 5024 1271 3753 5,100 — 470 110 270 480 -- — 7/27/1995 -- 5024 1300 3724 7,400 — 410 42 360 630 -- -- 10/26/1995 -- 5024 1303 — -- — — — — _ 10/27/1995 — 5024 -- - 7,600 -- 640 33 440 410 — 2/12/1996 -- 5024 1200 — 3 800 -- 390 <0 5 220 98 -- 4/18/1996 -- 5024 1258 -- 500 — 60 <0 5 20 74 — — 7118/1996 — 5024 1285 -- 3 400 — 200 <5 130 56 60 11/15/1996 -- 5024 1340 2,500 — 180 <2 5 62 21 590 — 3/14/1997 NP 5024 1335 -- 1,700 — 130 <05 <0 5 <0 5 230 013 6/4/1997 NP 5024 1273 -- 520 — 36 31 1 4 15 47 005 8/11/1997 -- 5024 -- — -- — — — — _ 11/17/1997 NP 5024 1296 - <50 — <0 5 <0 5 <0 5 <05 290 — 3/30/1998 NP 5024 1215 910 -- 46 <0 5 <0 5 1 1 110 1 6 6/25/1998 NP 5024 1270 -- 692 — 0 666 <0 5 <0 5 <0 5 765 1 6 9/1111998 NP 5024 1290 — <50 — <0 5 <0 5 <05 <0 5 290 1 7 12/15/1998 5024 -- — -- — — — -- — — -- After this sampling,Well no longer monitored or sampled T13-1 12/19/2001 -- 1 — -- <50 1 _ <0 50 <0 50 <0 50 <0 50 — - TEX-1 10/26/1995 — -- 1286 <350 — <5 <0 5 <0 5 <0 5 2/12/1996 -- — 1090 - -- — -_ — — — 4/18/1996 - -- 1135 — <50 -- <05 <05 <0 5 <0 5 — — 7/18/1996 — 1152 — -- 11/15/1996 - -- 1230 3/1411997 — -- -- 6/4/1997 8/11/1997 11/17/1997 -- -- 3/30/1998 -- 1100 — — — - — -- _ — Report Date March 21, 2005 Page 25 of 27