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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 TPH9 TPHd Benzene Toluene benzene Xylenes MtBE DO
<br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg/L) (Erg/L) (Erg/L) (pglL) (mg/L) Comments
<br /> MW-1 2/15/1995 - 10.36 41.19 -30.83 59 -- 2.1 2.5 1 3.3 NA -- No FP,No S,No O,[56]
<br /> 5/12/1995 -- 10.36 39.33 -28.97 84 - 4.7 4.1 1.7 6.5 NA -- No FP,No S,Yes O,[5fi]
<br /> 8/29/1995 -- 10.36 40.89 -30.53 190 - 8 5.8 4.7 18 NA INo FP,No S,Yes 0,[56]
<br /> 12/4/1995 -- 10.36 39.53 -29.17 78 -- 2.3 1.4 1.4 5.3 NA - No FP,No S,Yes 0,[56]
<br /> 2/2/1996 - 10.36 37.57 -27.21 59 - 3.4 1.5 1.5 4.9 NA - No FP,No S,No 0
<br /> 5/10/1996 - 10.36 35.04 -24.68 92 - 5.5 2.1 2.4 12 <3 - No FP,No S,No O,[56]
<br /> 8/29/1996 - 10.36 36.77 -26.41 100 - 4.2 1.4 3.2 12 <3 - No FP,No S,No O,[56]
<br /> 11/20/1996 - 1 10.36 35.75 -25.39 140 - 6 1.5 4.6 18 <3 - No FP,No S,No O,[56]
<br /> 3/19/1997 - 10.36 32.02 -21.66 230 - 11 2.2 6.4 20 <3 -- No FP,No S.No O,[56]
<br /> 5/27/1997 -- 10.36 32.27 -21.91 300 - 18 1.6 10 25 <3 - No FP,No S,No O,[56]
<br /> 8/12/1997 - 10.36 33.64 -23.28 110 - 7 0.75 4.8 9.6 <5 - No FP,No S,No O,[55]
<br /> 11/18/1997 - 10.36 33.38 -23.02 180 -- 15 1.3 10 14 <5 - No FP,No S,No O,[56]
<br /> 2/16/1998 -- 10.36 30.03 -19.67 <50 -- 1.9 2.8 0.74 2.7 <5 -- No FP,No S,Yes O,[57]
<br /> 6/23/1998 P 10.36 27.48 -17.12 103 - 4.58 0.581 3.17 1.46 <5 - No FP,No S,No O,[56]
<br /> 9/29/1998 P 10.36 29.25 -18.89 151 -- 12.4 <0.5 8.07 2.38 <5 - No FP,No S,Yes 0,155]
<br /> 12/30/1998 P 10.36 27.02 -16.66 61.9 - 3.72 <0.5 1.42 <0.5 <5 -- No FP,No S,No O,[55]
<br /> 3131/1999 P 10.36 25.83 -15.27 <50 1.43 <0.5 0.662 <0,5 <5 - No FP,No S,No O,[55]
<br /> 6/28/1999 P 10.36 26.75 -16.39 252 -- 24.5 <0.5 12.3 2.98 6.51 -- No FP,No S,No O,[55]
<br /> 9/1011999 P 10.36 28.75 -18.39 199 - 13.9 <0.5 8.13 7.01 5.02 - No FP,No S,No O,[55]
<br /> 12J1 3/1999 P 10.36 27.85 -17.49 <50 -- <0.5 <0.5 <0.5 <0.5 5.88 - No FP,No S,No O,[55]
<br /> 3/28/2000 P 10.36 24.61 -14.25 109 - 3.29 <0.5 1.86 0.89 4.43 -- No FP,No S,No O,[55]
<br /> 6/26/2000 P 10.36 25.60 -15.24 70.2 -- 6.46 <0.5 1.46 0.916 <2.0[2] - No FP,No S,No O,[56]
<br /> 9/26/2000 P 10.36 28.14 -17.78 54.8 -- 2.18 <0.5 1.11 <0.5 <2.5 -- No FP,No S,No O
<br /> 12/18/2000 P 10.36 26.80 -18.44 <50 - 0.559 <0.5 <0.5 0.562 11.6[2] -- No FP,No S,No O
<br /> 3/14/2001 P 10.36 25.37 -15.01 <50 I - 0.892 1.43 <0.5 1.8 19 - No FP,No S,No O
<br /> 6/19/2001 P 10.36 26.35 -15.99 <50 - 1.2 1.1 <0.5 0.73 8.8[2] - No FP,No S,No O
<br /> 9/11/2001 P 10.36 28.85 -18.49 <50 - <0.5 <0.5 <0.5 0.6 15[2] -- No FP,No S,No O
<br /> 12/13/2001 P 10.36 28.15 -17.79 540 -- 43 160 13 76 1,900[2] -- No FP,No S,Yes O
<br /> 3/12/2002 P 10.36 26.37 -16.01 60[3] - 4.4 5.5 <0.50 4 1,100[2] - No FP,No S,Yes O
<br /> 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 0-
<br /> 12/4/2002
<br /> 12/4/2002 P 10.36 30.10 -19.74 <2,500 - <25 <25 <25 <25 740 - No FP,No S,No 0
<br /> 03/03/2003 P 10.36 28.29 -17.93 <1,000 - <i 0 <10 <i 0 <10 530[2] 5.34
<br /> Report Date:May 17,2004 Page 1 of 14
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