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C C Table I 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) (pg1L) (pg1L) (prg/L) (pgll-) (Ng/L) WL) (mg/L) Comments VW-8 12/2/1998 - - 38.69 -- NA -- NA NA NA NA NA - 3/31/1999 -- -- 37.50 -- NA - NA NA NA NA NA - 6/4/1999 -- - 36.56 - NA - NA NA NA NA NA -- 9/2/1999 - -- 40.99 -- NA - NA NA NA NA NA 11/29/1999 -- - 39.14 - NA - NA NA NA NA NA -- 3l16/2000 - - 35.24 .- NA - NA NA NA NA NA 6/26/2000 - - 37.80 - NA -- NA NA NA NA NA - 9/28/2000 - -- 42.03 -- NA - NA NA NA NA NA - 12/19/2002 - -- 41.57 -- 290 - 46 1.4 12 3.1 <1.0 03/06/2003 P - 39.27 -- 930 -- 150 J 1.6 68 1.4 1.0[2] 1.2 06/11/2003 P - 38.17 -- 530 - 81 1.9 J 23 1.3 <2.5[2] A2.17Water 09/24/2003 P 42.29 - 1,900 - 140 <5.0 200 270 <5.0[2)12110/2003 P - 41.60 - 81 - 1.1 <0.50 <0.50 <0.50 4.9[2] 03/08/2004 P -- 39.36 -- 1,500 - 120 <2.5 64 <2.5 <2.5[2] 06/24/2004 NP - 44.11 - 130 - 2.6 <2.5 <2.5 <2.5 2.8[2] levels taken on4 09/20/2004 P -- 48.40 - 51,000 J - 2,400 110 340 200 <50[2) 0.4 12/21/2004 P 44.90 - 15,000 -- 1,200 J 64 440 450 <5.0[2] 0.5 Water Level Data 12/20/04 03/27/2005 P 1 41.65 -- 4,100 -- 1,200 120 320 250 <25[2] 1.0 VW-9 03/06/2003 -- -- - - - - - -- - - - 12/10/2003 - -- -- - - -- - - -- - =Sampled, 03/08/2004 - -- -- - - - - - - - -- 06/23/2004 NP - - - - -- - _ - -- Sampled 09/20/2004 - - - - - - -- -- - - - Sampled 12/20/2004 -- - - - - -- -- - -- -- - Well Dry 03/28/2005 -- 1 -- - -- -- -- -- -- -- -- - We]I Dry,Not Sampled VW-10 12/19/2002 - - 41.59 -- 14,000 - 2,800 890 890 3,600 <10.0[2) - 03/06/2003 P -- 39.13 -- 20,000 - 2,600 260 1,300 4,900 <50[2) 2.3 06111/2003 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 Report Date:April 25, 2005 Page 20 of 23