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Table 4 <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 TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg1L) (pg/L) Gig/L) (pg/L) (mg/L) Comments <br /> VW-4 9/9/2002 NP - 30.28 - 73 - <0.5 <0.5 <0.5 <0.5 110 -- No FP,No S,No O <br /> 12/4/2002 NP - 27.51 - 94 -- <0.5 1.8 0.53 23 39 - No FP,No S,No O <br /> 03/03/2003 NP -- 26.25 -- <50 - <0.50 <0.50 <0.50 <0.50 0.88[2] - <br /> 06/03/2003 NP - 26.13 - <50 - <0.50 <0.50 <0.50 <0.50 0.95[2] - <br /> 09/18/2003 NP - 29.69 - <50 -- <0.50 <0.50 <0.50 <0.50 50[2] -- <br /> 12/08/2003 NP -- 30.76 -- <50 - <0.50 <0.50 <0.50 <0.50 6.4[2] - <br /> 03/11/2004 NP -- 27.03 - <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - <br /> 06/11/2004 NP - 31.03 - <50 -- <0.50 <0.50 <0.50 <0.50 1.1[2] 1.6 <br /> 08103/2004 P -- 32.45 - 62 - <0.50 <0.50 <0.50 <0.50 55[2] 1.1 <br /> VW-51) 12!30/1998 -- - -- _ _ _ _ _ - - - - Inaccessible because of <br /> soil stockpiles <br /> 3/31/1999 - - 25.65 - -- - - - - - - - No FP,Yes S,Yes O Not <br /> scheduled for sampling <br /> 6/28/1999 - - 26.74 - - -- -- _ _ _ -- No FP,No S,No O Not <br /> scheduled for sampling <br /> 9/10/1999 - - 29.00 -- -- -- - - - - -- -- No FP, No S,No O Not <br /> scheduled for sampling <br /> 12/13/1999 - - 28.20 - - - -- -- - -- - -- No FP, No S,No O Not <br /> scheduled for sampling <br /> 3/28/2000 -- - 24.97 - - - -- - -- -- - - No FP,No S,No O Not <br /> scheduled for sampling <br /> 6/26/2000 - -- 29.81 - -- - -- - - -- - - No FP,No S,No O Not <br /> scheduled for sampling <br /> 9/28/2000 - - 28.31 - -- -- - - - - -- No FP, No S,No O Not <br /> scheduled for sampling <br /> 12/18/2000 -- -- - - -- - - - - - - - Yes FP,Yes S,Yes O <br /> Not scheduled for <br /> sampling <br /> 3/14/2001 - -- 25.00 - - - - - - -- - - Yes FP Not scheduled for <br /> sampling <br /> 6/19/2001 - - 24.95 -- -- -- -- - - - -- -- No FP, No S,Yes O Not <br /> scheduled for sampling <br /> 9/11/2001 - - 28.00 - - - -- -- - - - - No FP,No S,Yes O Not <br /> scheduled for sampling <br /> 12/13/2001 NP -- 28.42 - 54,000 - 840 2,300 1,100 17,000 67[2] - No FP,No S,No O <br /> 3!1212002 NP - 25.65 - 1,400[3] -- <5.0 8 <5.0 96 <2.5[2][5] -- No FP, No S,No O <br /> Report Date:August 25,2004 Page 12 of 15 <br />