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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 548 1612 W. Hammer Lane, Stockton, CA TOC Depth to Water Levet IEthyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes Mt13E DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (Eig/L) (yg/L) WgIL) (Erg/L) (pg/L) (Erg/L) (P91L) (mg/L) Comments VW-1 12/13/1999 -- - 27.46 - -- - - -- - - No FP,No S, No 0 Not scheduled for sampling 3/28/2000 - -- 24.23 -- -- - - - - - -- No FP,No S, No 0 Not scheduled for sampling 6/26/2000 - -- 25.11 -- - - - - - - -- No FP,No S,No 0 Not scheduled for sampling 9/28/2000 -- - 27.72 -- -- - - - -- - -- No FP,No S, No 0 Not scheduled for sampling 12/18/2000 -- -- 25.50 - -- - -- - -- - - -- No FP,No S,No 0 Not scheduled for sampling 3/14/2001 - - 24.33 - - -- - - - -- - No FP,No S,No O Not scheduled fpr sampling 6/19/2001 - - 25.50 -- - -- - - - - -- - No FP,No S, No 0 Not scheduled for sampling 9/11/2001 -- -- 26.28 -- -- - - - - -- - - No FP,No S,No O Not scheduled for sampling 12/13/2001 NP - 27.74 - <50 - 2.5 <0.50 <0.50 <0.50 87[2] - No FP,No S,No 0 3/12/2002 NP - 25.20 - <50 -- <0.50 <0.50 <0.50 <0.50 0.68[2] -- No FP,No S,No 0 6/17/2002 NP - 26.95 -- <50 - <0.50 <0.50 <0.50 <0.50 7.8[2] -- No FP,No S,No 0 9/9/2002 NP - 29.54 - <50 - 0.55 <0.5 <0.5 <0.5 60 - No FP,No 5,No 0 12/4/2002 NP -- 29.64 - 310 - 14 0.59 1.1 6.1 97 - No FP,No S,No O 03/03/2003 NP -- 28.77 -- <100 -- <1.0 <1.0 <1.0 <1.0 30121 - 06/03/2003 NP -- 28.51 - <50 -- <0.50 <0.50 <0.50 <0.50 22[2]09/18/2003 NP - 32.03 - 250 - 23 <2.5 <2.5 2.6 120[2] -- 12/08/2003 NP - 31.89 - 170 -- 10 <5.0 <5.0 <5.0 120[2] -- Z ?--I z- 03!1112004 - -» 28.52 - - - - -- - - - -- Not Sampled 05/03/2004 NP - 27.96 -- <50 - <0.50 <0.50 <0.50 <0.50 4.1[21 - VW-2 9/29/1998 NP -- 29.01 - 13.200 - 822 <12.5 1,370 754 <125 -- No FP,No S,Yes 0,[41] 22-YZ 12/30/1998 NP - 27.47 -- 8,950 -- 778 <20 1,180 339 <200 -- No FP,No S,Yes 0,1411 3/31/1999 -- -- 25.21 -- - - - -- - -- -- - No FP,No S,No O Not scheduled for sampling 6/28/1999 - 26.35 -- - -- -- -- - - -- No FP, No S,No O Not scheduled for sampling 9/10/1999 - -- 29.29 -- -- - -- - - - - -- No FP,No S,No O Not scheduled for sampling 12/13/1999 - 1 28.43 - - -- - -- - -- -- - No FP,No S.NO 0 Not scheduled for sampling Report Date:May 17,2004 Page 8 of 14 i'