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<br /> 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) W/L) (/.g/L) (pg/L) (pg/L) (ug1L) (pg/L) (ug1L) (mg/L) Comments
<br /> VW-2 9/9/2002 NP - 30.75 - 200 - 2.3 0.77 <0.5 <0.5 4.4 - No FP,No S,No O
<br /> 12/412002 NP - 30.25 - 770 - 18 <0.5 <0.5 <0.5 5.4 -- No FP,No S,No O
<br /> 11.0 <1.0 <1.0 <1.0 <1.0[2]
<br /> 03/03/2003 NP - 28.88 -1100-- -- -
<br /> 06/03/2003 NP - 28.64 - <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] -
<br /> 09/18/2003 NP - 32.20 - 380 - <5.0 <5.0 <5.0 <5.0 <5.0[2] -
<br /> 12/08/2003 NP - 32.01 - 490 -- <5.0 <5.0 <5.0 <5.0 5.0[2] -
<br /> 03/11/2004 NP - 28.61 - 290 - <5.0 <5.0 <5.0 <5.0 <5.0[2] -
<br /> 06/11/2004 NP - 31.30 - <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.0
<br /> 08/03/2004 P -- 32.71 - 600 - 3.9 <0.50 12 1.1 2.4[2] 1.9
<br /> VW-3 9/29/1998 NP -- 29.45 - 39,300 - 2,360 391 1,540 9,790 <500 - No FP,No S,Yes O,[40]
<br /> 12/30/1998 NP - 27.28 -- --40,500 -- 3,450 287 2,370 11,700 <500 INo FP,No S,Yes O,[40]
<br /> 3/31/1999 - -- 25.87 - - -- - -- - - -- - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 6/28/1999 - -- 26.88 -- -- - - - - - - - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 9/10/1999 - - 28.89 - - - - - - -- - - No FP,No S.No O Not
<br /> scheduled for sampling
<br /> 12/13/1999 - - 28.06 -- - -- - - - - - - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 3/28/2000 -- - 24.88 - - - -- - -- - - - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 6/26/2000 -- -- 29.78 -- - - -- - -- - - - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 9/28/2000 -- -- 28.30 -- - - - _ __ _ - No FP,No S•No O Not
<br /> scheduled for sampling
<br /> 12/18/2000 - - 26.08 - - -- _ _ _ _ - - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 3/14/2001 -- - 24.20 -- - - -- - - -- - - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 6/i912001 - -- 26.50 - - _ _ _ _ _ _ - No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 9/11/2001 - - 29.02 - -- - - -- - -- - -- No FP,No S,No O Not
<br /> scheduled for sampling
<br /> 12/13/2001 NP - 28.35 - 1,100 - 150 <5.0 7.6 16 16[2] -- No FP,No S,No O
<br /> 3/12/2002 NP -- 24.80 - 150 - -10.50 10.50 -0.50 1 <0.50 0.72[2] - No FP,No S,No O
<br /> 6/17/2002 NP -- 27.60 - <50 - <0.50 <0.50 <0.50 1 <0.50 <0.50[2] INo FP,No
<br /> Report Date:August 25, 2004 Page 10 of 15
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