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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) Wg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments
<br /> MW-6 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 O
<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 <0.50[2] 2.6
<br /> 08/03/2004 P 8.95 30.97 -22.02 78 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.9
<br /> VW-1 9/29/1998 NP -- 28.73 -- 18,800 - 573 59 873 4,120 2,300 _ INo 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 0, [43]
<br /> 3/31/1999 -- -- 24.97 - - - - - -- - -- - No FP,No S,No 0 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 0 Not
<br /> scheduled for sampling
<br /> 12/13/1999 - - 27.46 - -- - - - - - - - No FP,No S,No O Not
<br /> ` scheduled for sampling
<br /> 3/28/2000 - - 24.23 - - - -- - - - -- -- No FP, No S,No O Not
<br /> scheduled for sampling
<br /> 6/26/2000 -- -- 25.11 - - -- - - -- - - -- No FP,No S,No 0 Not
<br /> scheduled for sampling
<br /> 9/28/2000 - -- 27.72 - - - - - - - - - No FP,No S,No 0 Not
<br /> scheduled for sampling
<br /> 12/18/2000 - - 25.50 -- -- -- - - - - - No FP, No S,No O Not
<br /> scheduled for sampling
<br /> 3/14/2001 -- 24.33 _ _ _ _ _ _ - -- No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 6/19/2001 -- - 25.50 - - - - - - - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 9/11/2001 - -- 26.28 _ _ _ _ _ _ _ - -- No FP, No S, No O Not
<br /> scheduled for sampling
<br /> 12/13/2001 NP - 27.74 - <50 - 2.5 <0.50 <0.50 <0.50 87121 - No FP,No S,No 0
<br /> 3/12/2002 NP - 25.20 - <50 - <0.50 <0.50 <0.50 <0.50 0.68[2] -- No FP,No S,No O
<br /> 6/17/2002 NP - 26.95 -- <50 - <0.50 <0.50 1 <0.50 <0.50 7.8[2] - No FP,No S, No O
<br /> 9/9/2002 NP -- 29.54 - <50 - 0.55 <0.5 <0.5 <0.5 60 -- INo FP,No S,No 0
<br /> Report Date:August 25,2004 Page 8 of 15
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