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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tracy Blvd, Tracy, CA TO 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) (pg/L) (pg/L) (pg1L) (pg/L) (pg1L) (pglL) (mg1L) Comments ATR-3 2/28/1995 - 4993 1205 3790 -- -- - - - -- -- - ^,0 03 ft free product present 4/26/1995 - 4993 1232 3761 - - -- - - - - -- Sheen 7/27/1995 - 4993 1251 3742 10/26/1995 -- - 1297 - 2/12/1996 - -- 1210 -- 1,500 - 89 <0 5 43 150 -- -- 4/18/1996 - -- 1260 - - - -- -- - - - 7/18/1996 -- - 1260 - 1,600 -- 26 52 70 51 1 800 -- 11/15/1996 - - 1340 - - - - - -- -- - - 3/14/1997 NP -- 13 34 - 1,200 - 10 <0 5 43 19 620 005 6/4/1997 -- - 1270 -- -- - - - - -- - 015 8/11/1997 NP - 1272 - 3,400 -- 20 1 <10 160 110 <50 - 11/17/1997 - - 1293 - - - - - - - - 3/30/1998 NP - 1218 -- 8,400 - <2 5 <25 100 52 120 0 8 6/25/1998 - - 1241 -- - - -. - - - - - 9/11/1998 NP - 1284 - 1,100 - 61 <05 25 22 41 123 12/15/1998 - -- 1160 - - -- - - - - - 21 3117/1999 NP - 1241 - 652 - 141 <05 117 729 164 7 8 5/14/1999 -- - 1270 - - -- - - -- -- - 12 9/1611999 NP - 1279 -- 2,800 - 175 <50 499 151 523 19 12/22/1999 -- - 1276 -- - - - - -- -- - 037 2/29/2000 NP -- 1210 - 405 235 <1 00 515 118 2160 36 6/7/2000 NP - 1281 - - - - -. - - - 9/25/2000 NP - 1301 - 2,350 - <2 50 565 269 84 464 06 12/29/2000 -- - 1147 - -- - - - - -- - 42 3/27/2001 P - 1249 - <50 0 - <0 500 <0 500 <0 500 <0 500 526* 32 6/20/2001 - -- 1265 - - - - - - - - - 9/12/2001 P - 1271 -- 54 - 053 1 056 25 8 3 25 12/19/2001 -- - 1256 - - -- -- - - - - - 3/14/2002 P - 1257 -- 2,300 - <10 10 <10 <10 <5 0* 128 6/28/2002 9/11/2002 P - 1278 - 51 -- <05 <0 5 <05 <05 <0 5* 29 12/17/2002 Report Date February 22,2005 Page 6 of 27