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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No. 548 <br /> 1612 W. Hammer Lane, Stockton, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date P/ Elevation Water Elevation TPI-Ig TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) Wg/L) (mglL) Comments <br /> MW-6 9/9/2002 P 8.95 29.11 -20.16 <50 -- <0.5 <0.5 <0.5 <0.5 1 - No FP,No S,No O <br /> 12/4/2002 P 8.95 28.86 -19.91 <50 - <0.5 <0.5 <0.5 <0.5 <0.5 - No FP,No S.No D <br /> 03/03/2003 P 8.95 29.04 -20.09 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.86 <br /> 06/03/2003 P 8.95 29.00 -20.05 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 5.1 <br /> 09/18/2003 -- 8.95 -- -- -- -- -- -- -- -- - -- Not Sampled <br /> 12/08/2003 P 8.95 30.52 -21.57 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] <br /> 03/11/2004 P 8.95 30.43 -21.48 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.11 <br /> 06/11/2004 P 8.95 29.50 -20.55 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50121 2.6 <br /> 08/03/2004 P 8.95 30.97 -22.02 78 -- <0.50 <0.50 <0.50 <0.50 <0.5012] 1.9 <br /> 12/22/2004 P 8.95 30.17 -21.22 <50 -- <0.50 <0.50 <0.50 <0.50 <0.5012] 4.5 <br /> 03/29/2005 P 8.95 27.70 -18.75 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.63 <br /> 06/16120051 P 8.95 27.17 -18.22 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 3.49 <br /> ---rO9/09/20051 P 1 8.95 1 29.40 -20.45 1 <50 I - 1 <0.50 1 <0.50 1 <0.50 1 <0.50 <0.50[2] 0.3 <br /> MW-7 12/13/2004 P 10.74 31.43 -20.69 51 -- <2.5 <2.5 <2.5 <2.5 4112] 2.0 <br /> %/1 12/22/2004 P 10.74 30.35 -19.61 <100 - <0.50 <0.50 <0.50 <0.50 30[2] 3.5 <br /> 5U <br /> '40 03/29/2005 P 10.74 27.83 -17.09 <50 -- <2.5 Q.5 <2.5 <2.5 56[2] 1.06 <br /> 06/16/2005 P 10.74 27.27 -16.53 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.86 <br /> 09/09/2005 P 10.74 29.56 -18.82 <50 -- <0.50 <0.50 <0.50 <0.50 5.2[2] 4.59 <br /> MW-8 12/13/2004 P 11.55 31.04 -19.49 2,400 - 12 47 51 260 <2.5[2] 2.2 <br /> 12/22/2004 P 11.55 30.90 -19.35 470 -- 6.6 2.7 4.2 81 <2.5[2] 3.9 <br /> 03/29/2005 P 11.55 28.40 -16.85 82 - <0.50 0.50 <0.50 8.9 <0.50[2] 2.2 <br /> 06/16/2005 P 11.55 27.88 -16.33 <50 <0.50 <0.50 <0-50 1.9 <0.50[2] 1.8 <br /> 09/09/2005 P 11.55 30.02 -18.47 <50 - <0.50 <0.50 <0.50 <0.50 <0.5012] 1.7 <br /> vw-1 9/29/1998 NP -- 28.73 -- 18,800 -- 573 59 873 4,120 2,300 -- No FP, No S,Yes O,[43] <br /> 12/30/1998 NP 26.50 19,200 2,150 <50 691 3,310 785 No FP, No S,Yes O,[43] <br /> 3/31/1999 24.97 -- -- -- -- -- -- No FP,No S, No O Not <br /> _ scheduled for sampling <br /> 6/28/1999 25.99 -- - No FP,No S, No O Not <br /> scheduled for sampling <br /> 9/10/1999 28.33 - - No FP,No S,No O Not <br /> scheduled for sampling <br /> 12/13/1999 -- 27.46 - - - No FP,No S,No O Not <br /> scheduled for sampling <br /> Report Date:November 17,2005 Page 9 of 17 <br />