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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 5450 1617 W. Fremont Street, Stockton, 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) (prg/L) WL) WL) (p91L) (Erg1L) (ug1L) (Pg1L) (mg/L) Comments MW-2 9/11/2002 P 8.67 11.37 -2.70 98 -- <0.50 <0.50 <0.50 <0.50 62 11/27/2002 P 8.67 10.90 -2.23 <50 - <0.50 <0.50 <0.50 <0.50 43 2.2 03/14/2003 P 8.67 10.60 -1.93 <50 -- <0.50 <0.50 <0.50 <0.50 28* 5.2 04/24/2003 P 8.67 10.72 -2.05 <50 -- <0.50 <0.50 <0.50 <0.50 30* 2.4 08/14/2003 P 8.67 11.30 -2.63 <50 <0.50 <0.50 <0.50 <0.50 18* 2.3 11/06/2003 P 8.67 11.68 -3.01 <50 <2.5 <2.5 <2.5 <2.5 36* 2.2 02/26/2004 P 8.67 10.62 -1.95 <50 -- <0.50 <0.50 <0.50 <0.50 19* 2.8 0 511 1 12 0 04 P 8.67 12.80 -4.13 <50 -- <0.50 <0.50 <0.50 <0.50 4.2* -- 08/31/2004 P 8.67 11.46 -2.79 <50 - <0.50 <0.50 <0.50 0.52 2.6* 1.4 11/22/2004 P 8.67 11.18 -2.51 <50 UJ - <0.50 <0.50 <0.50 <0.50 21' 1.84 03101/2005 P 8.67 9.14 -0.47 <50 UJ -- <0.50 <0.50 . <0.50 <0.50 14* 1.8 i MW-3 9/11/2002 P 8.77 11.35 -2.58 <50 <0.50 <0.50 <0.50 <0.50 0.77 11/27/2002 P 8.77 11.17 -2.40 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50 1.8 03/14/2003 P 8.77 10.48 -1.71 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* 0.5 04/24/2003 P 8.77 10.50 -1.73 <50 - <0.50 <0.50 <0.50 <0.50 <0.50* 2.8 08/14/2003 P 8.77 11.23 -2.46 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* 2.1 11/0612003 P 8.77 11.56 -2.79 <50 - <0.50 <0.50 <0.50 <0.50 <0.50* 1.9 02/26/2004 P 8.77 9.45 -0.68 <50 - <0.50 <0.50 <0.50 <0.50 <0.50* 2.2 05!11/2004 P 8.77 10.73 -1.96 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* 3.0 08/31/2004 P 8.77 91.58 -2.81 <50 - <0.50 <0.50 <0.50 <0.50 <0.50* 0.7 1112212004 P 8.77 11.52 -2.75 <50 UJ - <0.50 <0.50 <0.50 <0.50 <0.50* 1.94 03/01/2005 P 8.77 8.54 0.23 <50 UJ - <0.50 <0.50 <0.50 <0.50 <0.50* 2.0 MW4 9/11/2002 P 8.66 11.34 -2.68 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50 11/27/2002 P 8.66 11.19 -2.53 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50 1.1 03/14/2003 P 8.66 10.60 -1.94 <50 - <0.50 <0.50 <0.50 <0.50 0.69* 1.5 04/24/2003 P 8.66 10.77 -2.11 <50 <0.50 <0.50 <0.50 <0.50 0.66* 2.7 08/14/2003 P 8.66 11.28 -2.62 <50 <0.50 <0.50 <0.50 <0.50 1.5* 2.6 11/06/2003 P 8.66 11.46 -2.80 <50 -- <0.50 <0.50 <0.50 <0.50 1.4* 2.7 02/26/2004 P 8.66 9.82 -1.16 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* -- 05/11/2004 P 8.66 10.76 -2.10 <50 - <0.50 <0.50 <0.50 <0.50 0.54* 3.0 08131/2004 P 8.66 11.61 -2.95 <50 -- <0.50 <0.50 <0.50 <0.50 3.1` 1.6 11/22/2004 P 8.66 11.22 -2.56 <50 UJ - <0.50 <0.50 <0.50 <0.50 <0.50* 1.86 Report Date:March 28,2005 Pagel of 3