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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 Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtSE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (I.gIL) (pglL) (pg1L) (pg1L) (pg1L) (1rg1L) (pglL) (mglL) Comments VW-1 12/30/1998 NP 26.50 -- 19,200 - 2,150 <50 691 3,310 785 - No FP,No S,Yes 0,[43] 3/31/1999 - - 24.97 -- - -- - -- -- -- -- -- No FP,No S, No O Not scheduled for sampling 6/28/1999 -- -- 25.99 - -- -- - -- - - - No FP,No S, No 0 Not scheduled for sampling 9/10/1999 - 28.33 - - _ __ -- - - -- No FP,No S,No 0 Not scheduled for sampling 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 O 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 O Not scheduled for sampling 12/18/2000 - - 25.50 - - - - - -- -- -- - No FP,No S.No O Not scheduled for sampling 3/14/2001 -- -- 24.33 -- -- - -- - - - - No FP,No S,No O Not scheduled for 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 0 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 O 3/12/2002 NP -- 25.20 - <50 - <0.50 <0.50 <0.50 <0.50 0.68[2] -- No FP,No S,No O 6/17/2002 NP - 26.95 - <50 -- <0.50 <0.50 <0.50 <0.50 7.8[2] - No FP,No S,No O 9/9/2002 NP - 29.54 -- <50 -- 0.55 <0.5 <0.5 <0.5 60 - No FP,No S,No O 12/412002 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 30[2] -- 06/03/2003 NP - 28.51 -- <50 -- <0.50 <0.50 <0.50 <0.50 22[2] - 0 911 812 0 0 3 NP - 32.03 - 250 - 23 <2.5 <2.5 2.6 120[2] - 1 210 812 0 0 3 NP - 31.89 - 170 - 10 <5.0 <5.0 <5.0 120[2] - 03/11/2004 - - 28.52 - - - - - - - - -- Not Sampled 05/03/2004 NP - 27.96 - <50 <0.50 <0.50 <0.50 <0.50 4.1[2) -- 06/11120041 NP -- 30,28 - 690 - 20 <2.5 <2.5 4.6 140[2] 1.7 VW-2 9/29/1998 I NP - 29.01 - 13,200 - 822 <12.5 1,370 754 <125 -- INo FP,No Report Date:July 26,2004 Page 8 of i5