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C r Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 2130 7906 N. Et_ Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date Pl Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (jug1L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments MW-10 12/1/1994 - 14.38 57.15 42.77 800 - <0.5 2.3 0.8 1.3 NA -- No FP,No S 2/28/1995 - 14.38 54.24 -39.86 300 - 0.9 <0.5 <0.5 <0.5 NA - No FP,No S 5/19/1995 14.38 52.32 -37.94 370 -- 0.9 <0.5 <0.5 <0.5 NA -- No FP,No S 8/28/1995 - 14.38 53.70 -39.32 420 - 1.2 <0.5 <0.5 <0.5 NA - No FP, No S 12/7/1995 - 14.38 52.61 -38.23 490 -- 0.7 <0.5 <0.5 <0.5 NA - No FP,No S 2/5/1996 - 14.38 50.13 -35.75 350 - 0.7 <0.5 <0.5 <0.5 NA - INo FP,No S 5/30/1996 - 14.38 47.09 -32.71 350*** - <6** <0.5 <0.5 <0.5 <6** -- No FP, No S 9/18/1996 - 14.38 50.84 -36.46 510 -- 115*' 1 10.5 10.5 <9** - No FP,No S 11/26/1996 - 14.38 48.72 -34.34 <600**' -- <0.5 <0.5 <0.5 <0.5 <10** - No FP,No S 3/24/1997 -- 14,38 43.77 -29.39 1500*"' - <5** <0.8** <0.5 <0.5 <7'* - No FP,No S 5/20/1997 - 14.38 44.20 -29.82 460 - <5** <0.5 <0.5 <0.5 <7** - No FP,No S 8/19/1997 -- 14.38 47.66 -33.28 440 -- <0.5 <0.5 <0.5 <0.5 <5 - No FP,No S 11/19/1997 -- 14.38 45.95 -31.57 510 -- 2.2 2.2 0.93 3.1 <5 -- 314l1998 - 14.38 41.43 -27.05 110 - 0.66 <0.5 <0.5 <0.5 <5 -- No FP, No S 6/26/1998 -- 14.38 39.11 -24.73 329 - 4.75 <0.5 <0.5 <0.5 <5 - 911/1998 -- 14.38 40.78 -26.40 295 - <0.5 <0.5 <0.5 <0.5 <5 -- 12l211998 - 14.38 38.23 -23.85 407 - 6.89 <0.5 <0.5 0.873 19.5 -- 3/31/1999 -- 14.38 34.71 -20.33 217 -- 6.41 0.948 0.763 2.69 7.48 - 6/4/1999 -- 14.38 35.86 -21.48 288 -- <0.5 <0.5 <0.5 <0.5 6.53 - 9/2/1999 - 14.38 40.26 -25.88 152 - <0.5 <0.5 <0.5 <0.5 <5 - 11/29/1999 - 14.38 38.58 -24.20 198 - 3.58 <0.5 <0.5 0.61 9.08 - 3/16/2000 - 14.38 34.69 -20.31 270 - 0.741 <0.5 <0.5 <0.5 5.95 -- 6/26/2000 -- 14.38 37.05 -22.67 389 - <0.5 <0.5 <0.5 <0,5 <2[2] - 9/28/2000 -- 14.38 41.28 -26.90 <50 -- 0.87 <0.5 <0.5 <0.5 <2[2] -- 12/19/2000 - 14.38 37.20 -22.82 <50 - <0.5 <0.5 <0.5 <0.5 <2.5 - 3/15/2001 - -- -- -- - - -- -- - -- Well Covered 6/20/2001 -- -- 36.98 -- 11,000[5] - <2[4] <2[4) <2[4] <2[41 <2[2] - 9/12/2001 -- - - -- - - - -- - -- -- Well Covered 12/12/2001 - - -- -- - -- - -- - -- Well Covered 3/13/2002 -- -- - - - - - - -- - Well Covered 6/18/2002 - - - - -- - - - -- -- - Well Covered 9/11/2002 lWell Covered 12/18/2002 -- I lWell Covered Report Date:April 25, 2005 Page 16 of 23