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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) (pg/L•) (pg/L) (pg1L) (pg/L) (pg1L) (pg1L) (mg/L) . Comments VW-11:..- 09/12/2005 P -- -.47.05 - .450 _--: 36w <0.50 43:._ . 24 , _ <0.50[2] :_ _J.80.. .Water levels taken on... 9/11105 VW-12 5/20/1997 -- -- 43.78 - 1,500 -- 150 1 58 <1` <6. -- No FP,No S 9/1/1998 -- -- 40.65 -- NA -- NA NA NA NA NA -- 12/2/1998 -- - 37.66 - NA -- NA NA NA NA NA - 3/31/1999 - - 37.57 NA - NA NA NA NA NA 6/4/1999 -- 35.36 - NA -- NA NA NA NA NA -- 9/2/1999 - - 39.93 - NA - NA NA NA NA NA - 11/29/1999 -- -- 38.09 -- NA - NA NA NA NA NA -- 3/16/2000 -- - 34.23 -- NA -- NA NA NA NA NA -- 6/26/2000 - - 36.68 - NA - NA NA NA NA NA - 9/28/2000 - - 40.94 -- NA -- NA NA NA NA NA -- 12/19/2002 - 40.50 - <200 -- 120 <0.50 <0.50 <0.50 2.6[2] - 03/06/2003 P - 38.27 -- 440 R - <0.50 <0.50 <0.50 <0.50 0.98[2] -- 06/11/2003 P -- 37.61 -- <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- 09/24/2003 P - 41.71 - <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] -- <2.5 <2.5 <2.5 <2.5 9.5[2] 12/10/2003 P -- 41.31 - 214 - - 03/08/2004 P - 38.34 -- <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.01 06/24/2004 P - 43.22 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2) 2.22 Water levels taken on 6/23/04 09/20/2004 P - 47.38 -- 230 - <2.5 <2.5 <2.5 <2.5 <2.5[2] 1.0 12/20/2004 P -- 44.57 -- 330 J <0.50 <0.50 <0.50 <0.50 0.82[2] 2.35 03/28/2005 P - 41.55 - 310 - 23 <5.0 6.5 <5.0 <5.0[2] 1.60 06120/20051 P - 41.86 - 210 J - 3.8 J <0.50 1.2 J <0.50 1.5[2]J 1.30 Water level taken 6119/05 09/12/2005 P -- 46.37 160 -- 1.0 <0.50 <0.50 <0.50 0.81[2] 1.60 Water levels taken on 9111105 a Report Date:October 21,2005 Page 23 of 24