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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 Pl Elevation Water Elevation TPHg TPI-Id Benzene Toluene benzene Xylenes MtBE DO
<br /> Number Sampled NP (feet msl) (feet bgs) (feet msi) (pg/L) (pg1L) (,pg/L) (Vg1L) (pg1L) (pg1L) (pg1L) (mg1L) Comments
<br /> MW-5 5/10/1996 9.37 34.15 -24.78 5,700 - 420 180 380 610 34 - No FP,No S,No O,[60]
<br /> 8129/1996 -- 9.37 35.99 -26.62 9,600 - 510 90 710 970 39 - No FP,No S,No O,[60]
<br /> 11/20/1996 -- 9.37 34.83 -25.46 4,500 -- 210 93 310 510 `<50 - No FP, No S,No O,[60]
<br /> 3/19/1997 - 9.37 31.12 -21.75 6,200 - 420 68 360 590 `<60 - No FP,No S,No 0,[60]
<br /> 5/27/1997 -- 9.37 31.19 -21.82 4,500 - 490 59 230 350 97 - No FP,No S.Yes O
<br /> 8/12/1997 - 9.37 32.76 -23.39 3,600 - 260 12 260 350 110 - Na FP,No S,Na O,[60]
<br /> 11/18/1997 - 9.37 32.49 -23.12 1,300 -- 180 12 18 88 "<25 -- No FP,No S,Yes O,[61]
<br /> 2/16/1998 - 9.37 29.14 -19.77 630 - 110 <2.5 22 8.3 44 - No FP,No S,Yes O,
<br /> [61.5]
<br /> 6/23/1998 P 9.37 26.61 -17.24 702 - 50.4 7.91 33.3 36.6 47.3 - No FP,No S,No O,[60j
<br /> 9129/1998 P 9.37 28.39 -19.02 1,790 - 242 <5 121 135 145 - No FP,No 5,No O,j60]
<br /> 12/30/1998 P 9.37 26.22 -16.85 275 -- 19 <0.5 6.05 0.629 38.2 No FP,No S,No O,[60]
<br /> 3/31/1999 P 9.37 24.71 -15.34 93.4 - 8.42 <0.5 <0.5 0.835 15.7 - No FP,Na 5,No O, [60]
<br /> 6/28/1999 P 9.37 25.88 -16.51 175 - 22.4 <0.5 1.15 2.03 32.8 - No FP,No S,No O,[60]
<br /> 9/10/1999 P 9.37 27.87 -1$.50 614 - 41.9 <0.5 10.9 29.3 93.6 - No FP,No S,No O,[60]
<br /> 1211311999 P 9.37 26.92 17.55 <50 -- <0.5 <0.5 <0.5 <0.5 7.52 - No FP,No S,No 0,[60]
<br /> 3/28/2000 P 9.37 23.74 -14.37 <50 -- <0.5 <0.5 <0.5 <0.5 <2.5 -- Na FP,No S,Na O,[60]
<br /> 6/26/2000 P 9.37 24.71 -15.34 106 - 1.99 <0.5 <0.5 <0.5 42j2] - No FP,No 5,No O,[61]
<br /> 9/28/2000 P 9.37 27.24 -17.87 137 - <0.5 <0.5 <0.5 <0.5 47.4 - No FP,No S,No 0
<br /> 12/18/2000 P 9.37 25.87 -16.50 <50 - <0.5 <0.5 <0.5 <0.5 <2[2] -- No FP,No S,No O
<br /> 3/14/2001 P 9.37 24.48 -15.11 <50 - <0.5 <0.5 <0.5 <0.5 <1.0 - No FP,No S,Yes O
<br /> 611912001 P 9.37 25.43 -16.06 <50 - <0.5 <0.5 <0.5 <0.5 <2[2] - No FP,No S,Yes O
<br /> 9111/2001 0 1 P 9.37 27.95 -18.58 <50 - <0.5 <0.5 <0.5 <0.5 <2[2] -- No FP,No S,Yes 0
<br /> 12113/2001 P 9.37 27.20 -17.83 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -- No FP,No S.
<br /> Yes O
<br /> 3/12/2002 P 9.37 25.53 -16.16 <50 -- <0.50 <D.50 <0.5D <D.50 0.98[2] - No FP,No S,Yes O
<br /> 6/17/2002 P 9.37 26.53 -17.16 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] - No FP,No S,Yes O
<br /> 9/9/2002 P 9.37 29.38 - .01 <50 - <0.5 <0.5 <0.5 <0.5 No FP,No S,Yes O
<br /> 20
<br /> 12/4/2002 P 9.37 29.14 -19.77 <50 -- <0.5 0.62 <0.5 3.4 <D.5 - No FP,No S,Yes O
<br /> 03/03/2003 P 9.37 2$.91 -19.54 <50 - <D.50 <0.50 <0.50 <0.5D <D.5aj2] 1.99
<br /> 06/03/2003 P 9.37 28.67 -19.30 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 5.48
<br /> 09/18/2003 P 9.37 32.08 -22.71 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 1.21
<br /> 12/08/2003 P 9.37 31.93 -22.56 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] -
<br /> 03/11/2004 P 9.37 29.17 -19.80 <50 - <0.50 <0.50 <0.5D <0.5Q <0.50[2] 3.36
<br /> Page 6 of 15
<br /> Report Date:August 25,2004
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