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<br /> 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 TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO
<br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) WL) (Erg/L) (pg/L) (pg/L) (Erg1L) (mg1L) Comments
<br /> MW-3 12/18/2000 P 9.95 26.37 -16.42 <50 -- <0.5 <0.5 <0.5 <0.5 <2[2] - No FP,No S, No O
<br /> 3/14/2001 P 9.95 24.92 -14.97 <50 - <0.5 <0.5 <0.5 <0.5 <1.0 -- No FP,No S,No O
<br /> 6/19/2001 P 9.95 25.91 -15.96 <50 -- <0.5 <0.5 <0.5 <0.5 <2[2] No FP,No S,No O
<br /> 9/11/2001 P 9.95 28.41 -18.46 <50 - <0.5 <0.5 <0.5 <0.5 <2[2] -- No FP,No S, No O
<br /> 12/13/2001 P 9.95 1 27.77 -17.82 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - No FP,No S,No O
<br /> 3/12/2002 P 9.95 25.94 -15.99 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] -- No FP,No S, No O
<br /> 6/17/2002 P 9.95 27.02 -17.07 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - No FP,No S, No O
<br /> 9/9/2002 P 9.95 29.85 -19.90 <50 <0.5 <0.5 <0.5 <0.5 <0.5 -- No FP,No S, No O
<br /> 12/4/2002 P 9.95 29.68 -19.73 <50 - <0.5 <0.5 <0.5 <0.5 <0.5 - No FP,No S,No O
<br /> 03/03/2003 P 9.95 27.91 -17.96 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2) 2.46
<br /> 06/03/2003 P 9.95 27.93 -17.98 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2) --
<br /> 09/18/2003 P 9.95 31.38 -21.43 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] 0.99
<br /> 12/08/2003 P 9.95 31.33 -21.38 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] --
<br /> 03/11/2004 P 9.95 29.14 -19.19 <50 - <0.50 <0.50 <0.50 <0.50 <0,50[2] 1.77
<br /> 06/11/2004 P 9.95 30.30 -20.35 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.9
<br /> MW-4 2/15/1995 - 11.57 42.12 -30.55 <50 -- <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S, No O,[63]
<br /> 5/12/1995 -- 11.57 40.28 -28.71 <50 - <0.5 <0.5 <0.5 <0.5 NA - No FP,No S, No O,[63]
<br /> 8/29/1995 -- 11.57 41.72 -30.15 <50 - <0.5 <0.5 <0.5 <0.5 NA - No FP,No S, No O,[63)
<br /> 12/4/1995 11.57 40.44 -28.87 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S, No O, [63]
<br /> 2/2/1996 - 11.57 38.54 -26.97 <50 -- <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S, No O
<br /> 5/10/1996 - 11.57 36.02 -24.45 <50 - <0.5 <0.5 <0.5 <0.5 <3 -- No FP,No S,No O,[63]
<br /> 8/29/1996 -- 11.57 37.60 -26.03 <50 <0.5 <0.5 <0.5 <0.5 <3 - No FP,No S,No O,[63]
<br /> 11/20/1996 11.57 36.71 -25.14 <50 <0.5 <0.5 <0.5 <0.5 <3 - No FP,No S,No O,[63]
<br /> 3/19/1997 11.57 33.08 -21.51 <50 <0.5 <0.5 <0.5 <0.5 <3 - No FP,No S,No O,[63)
<br /> 5/27/1997 11.57 33.21 -21.64 <50 <0.5 <0.5 <0.5 <0.5 <3 - No FP,No S,No O
<br /> 8/12/1997 - 11.57 34.45 -22.88 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- No FP,No S, No O,[62]
<br /> 11/18/1997 11.57 34.31 -22.74 <50 4.5 2.5 0.91 2,1 <5 - No FP,No S, No O,[64]
<br /> 2/16/1998 -- 11.57 31.17 -19.60 <50 - <0.5 <0.5 <0.5 <0.5 <5 -- No FP,No S, No O,[63.8]
<br /> 6/23/1998 P 11,57 28.52 -16.95 <50 <0.5 <0.5 <0.5 <0.5 <5 -- No FP,No S,No O,[62]
<br /> 9/29/1998 P 11.57 30.13 -18.56 <50 - <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S,No O,[62]
<br /> 12/30/1998 -- 11.57 - - - - - -- - -- -- -- Well inaccessible
<br /> 3/31/1999 P 11.57 26.69 -15.12 <50 -- <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O,(62]
<br /> 6/28/1999 P 11.57 27.66 -16.09 <50 - <0.5 <0.5 <0.5 <0.5 <5 No FP,No S, No O,[62]
<br /> Report Date:July 26,2004 Page 4 of 15
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