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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 TPI-Id Benzene Toluene benzene Xyienes MtBE DO
<br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) "/L) (Pg1L) (ug1L) (pg/L) (pg/L) (pg/L) (mg1L) Comments
<br /> MW-1 6/17/2002 P 10.36 27.45 -17.09 420[3] -- 2.2 2.4 <0.50 1 770[2] -- No FP,No S,No O
<br /> 9/9/2002 P 10.36 30.29 -19.93 400 - 0.9 0.53 <0.5 <0.5 900 - No FP,No S,No O
<br /> 12!412002 P 10.36 30.10 -19.74 <2,500 - <25 <25 <25 <25 740 -4No FP,No S,No O
<br /> 03/03/2003 P 10.36 28.29 -17.93 <1,000 - <10 <10 <10 <10 530[2] 5.3406/03/2003 P -17.75 <50 - 0.94 <0.50 <0.50 <0.50 320[2] 3.909/18/2003 P 10.36 31.63 -21.27 130 R -- <25 <25 <25 <25 320[2] 1.6
<br /> 12/08/2003 P 10.36 31.56 -21.20 80 R - <5.0 <5.0 <5.0 <5.0 250[2] --
<br /> 03/11/2004 P 10.36 29.96 -19.60 60 - <5.0 <5.0 <5.0 <5.0 200[2] 1.49
<br /> 06/11/2004 P 10.36 30.74 -20.38 56 -- <2.5 <2.5 <2.5 <2.5 110[2] 6.1
<br /> 08/03/2004 P 10.36 32.18 -21.82 1 10 -- <1.0 <1.0 <1.0 X1.0 100[2] 9.9
<br /> MW-2 2/15/1995 - 9.82 40.67 -30.85 <50 - <0.5 <0.5 0.5 <0.5 NA -- No FP,No S,No O,[61]
<br /> 5/12/1995 - 9.82 38.85 -29.03 <50 <0.5 <0.5 NA - No FP,No 5,No O,[61]
<br /> 8/29/1995 -- 9.82 40.44 -30.62 '<52 - <0.5 <0.5 1 <0.5 NA - No FP,No S,No O,[61]
<br /> 12/4/1995 - 9.$2 39.08 29.26 '<60 -- <0.5 <0.5 <0.5 <a.5 NA - No FP,No S,No O,[61]
<br /> 2/2/1996 -- 9.82 37.09 -27.27 <50 - <0.5 <0.5 <0.5 <0.5 NA -- No FP,No S,No O
<br /> 5/10/1996 - 9.82 34.55 -24.73 <50 - <0.5 <0.5 <0.5 <0.5 <3 fl- NojFP,Na S,No O,[61]
<br /> 8/29/1996 -- 9.82 36.29 -26.47 "<60 - <0.5 <0.5 <0.5 <0.5 <3 NP,No S,No O,[61]11/20/1996 - 9.82 35.25 -25.43 <50 - 0.5 <0.5 <0.5 <3 NP,No S,No O,[61]3/19/1997 .$2 .5221.70 <50 - 0.6 <0.5 <0.5 <0.5 <3 NP,Na S.
<br /> No O,[61]
<br /> 5/27/1997 - 9.82 31.79 -21.97 <50 - 1.2 <0.5 <0.5 <0.5 <3 - No FP,No S, No O
<br /> 8/12/1997 - 9.82 33.18 -23.36 52 -- <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S,No O,[60]
<br /> 11/18/1997 - 9.$2 32.88 -23.06 <50 -- 2.6 1.4 0.65 1.5 <5 - No FP,No S,Na O,[61]
<br /> 2!1611998 -----6.82 .48 -19.66 <50 - <0.5 <0.5 <0.5 <0.5 <5 No FP,No S, No O,[60]
<br /> 6/2311998 P 9.82 26.98 -17.16 <50 - <0.5 <0.5 <0.5 <0.5 <5 No FP,No S, Na O,[60]
<br /> 91291199$ P 9.82 28.78 -18.96 <50 -- <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S,No O,[60]
<br /> 12/30/1998 P 9.82 26.53 -16.71 <50 - <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S, No O,[60]
<br /> 3/31/1999 P 9.82 25.11 -15.29 <50 - <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S,No O,[60]
<br /> 6/28/1999 P 9.82 26.25 -16.43 <50 - <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S, No O,[60]
<br /> 9/1011999 P 9.82 28.28 -18.46 <50 - <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S, No O,[60]
<br /> 12/13/1 999 P 9.82 27.35 -17.53 <50 -- <0.5 <0.5 <0.5 <0.5 3.48 - No FP,No S,No O,[6a]
<br /> 3/28/2000 P 9.82 24.07 -14.25 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S,No O,[60]
<br /> 6/2fi/2000 EP
<br /> -15.30 <50 - <0.5 <0.5 <0.5 <0.5 <2.0[2] - No FP,No S, No O,[61]
<br /> 9/28/2000 9.82 27.68 -17.86 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 - No FP,No S,No O
<br /> Page 2 of 15
<br /> Report Date:August 25,2004
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