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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments VW-9 12/10/2003 - - -- -- -- -- -- -- - -- - Well Dry 03/08/2004 -- - - - - - - -- - -- - Well Dry 06/23/2004 NP -- -- -- -- - - -- - -- -- Weil Dry,Not Sampled 09/20/2004 -- -- -- - - - -- - -- Well Dry,Not Sampled 12/20/2004 -- -- -- - -- -- -- -- - -- - -- Not Sampled,Well Dry 03/28/2005 - - - - -- - -- - - -- - Well Dry,Not Sampled 06/19/2005 - - - -- - - - -- -- - - Dry 09/1112005 -- I IWell Dry,Not Sampled VW-10 12/19/2002 - I - 41.59 - 14,000 -- 2,800 890 890 3,600 <10.0[2] - 03l06l2003 P - 39.13 -- 20,000 -- 2,600 260 1,300 4,900 <50[2] 2.30 06/11/2003 P - 38.66 - 14,000 - 1,600 39 1,100 3,300 <25[2] 3.92 09/24/2003 P - 42.70 - 2,800 -- 180 7.4 270 480 <5.0[2] -- 12/10/2003 P - 41.61 -- 20,000 -- 3,200 J 720 J 2,100 J 6,800 J <5.0[2] - 03/08/2004 P -- 39.19 - 1,500 - 110 <2.5 62 <2.5 <2.5[2] 2.76 06/24/2004 NP -- 44.02 -- 150 -- <2.5 <2.5 <2.5 <2.5 2.812] - Water levels taken on 6123104 09/20/2004 P _ 48.15 - 640 - 84 76 37 140 <2.512] 0.80 12/21/20G4 P -- 44.57 - 34,000 - 2,600 J 4,400 J 2,300 J 7,000 J <50[2]UJ 0.30 Water Level Data 12/20/04 03/27/2005 P - 41.42 - 12,000 - 2,600 1,100 1,500 2,600 <50[2] 0.60 06119/20051 P - 41.72 - 10,000 J - 700 J 1,100 700 J 1,700 <12[2] 0.50 09/11/2005 P - 46.43 -- 4,000 -- 300 260 470 520 <12[2] 0.40 VW-11 12/19/2002 -- - 41.28 - 55 5.1 <0.50 0.64 <0.50 0.98[2] - 03/06/2003 P -- 39.04 - 110 - 1,2 <0.50 0.51 1.8 <0.50[2] 1.80 06/11/2003 P - 38.57 -- <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.96 09/24/2003 P -- 42.61 -- 74 -- <0.50 <0.50 <0.50 <0.50 8.0[2] -- 12/10/2003 P -- 41.32 180 - 1.3 <0.50 2.1 1.3 12[2] - 03/08/2004 P - 39.11 -- 460 - 0.55 J <0.50 1.6 J 9.0 J 20[2]J 2.51 06/23/2004 P -- 44.00 - <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.41 09/2012004 P 48.16 - 420 -- 27 <0.50 32 13 0.63121 1.0 12/20/2004 P - 45.27 -- 1,000 J - 48 J <0.50 120 J 55 0.69[2] 1.99 03/28/2005 P -- 42.25 - <50 - 0.75 <0.50 1.6 <0.50 <0.50[21 3.0 06/20/2005 P - 42.58 - <50 2.4 J <0.50 4.3 J <0.50 <0.50[2] 1.90 Water level taken 6119105 Report Date:October 21, 2005 Page 22 of 24