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C Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msi) (pg/L) (pg/L) {pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mglL) Comments MW-2 9/28/1994 - 15.19 59.06 -43.87 1,600 - 370 2.9 47 13 NA -- No FP,No S 12/1/1994 - 15.19 58.00 -42.81 220 - 21 <0.5 2.6 <0.5 NA -- No FP, No S 2/28/1995 - 15.19 55.08 -39.89 110 -- <0.5 <0.5 <0.5 <0.5 NA - No FP,No S 5/39/1995 -- 15.19 53.15 -37.96 400 - 23 <0.5 2.1 <0.5 NA -- No FP,No S 8/28/1995 -- 15.19 54.83 -39.64 650 - 84 <1* 9.3 1.1 NA - No FP,No S 12/7/1995 15.19 53.47 -38.28 540 - 18 <1* 3 <1* NA -- No FP,No S 2!511996 - 15.19 51.93 -36.74 310 - 2.8 0.6 1.3 0.8 NA - NoFP,No S 5/30/1996 -- 15.19 47.91 -32.72 510 31 1 5.9 1.3 <7*" - No FP,No S 9/18/1996 - 15.19 51.80 -36.61 920 -- 150 <2.5* 22 3.5 <15* -- No FP,No S 11/26/1996 -- 15.19 49.60 -34.41 520 - 21 <0.5 2.7 0.6 7 - No FP,No S 3/24/1997 -- 15.19 44.50 -29.31 <500*** -- <3*" <3** <3** <3** <20** -- No FP,No S 5/20/1997 -- 15.19 45.09 -29.90 720 -- 73 <1* 13 1.1 <6* -- No FP,No S 8/19/1997 -- 15.19 48.69 -33.50 1,200 - 240 <5 41 <5 <50** - No FP, No S 11/19/1997 -- 15.19 46.77 -31.58 <50 -- 1.7 0.89 <0.5 _ 0.87 <5 -- 3/4/1998 -- 15.19 42.18 -26.99 <50 -- 2.2 <0.5 <0.5 <0.5 5.1 -- No FP, No S 6/26/1998 - 15.19 39.87 -24.68 53.4 - 3.65 <0.5 <0.5 1.12 6.52 -- 9/1/1998 -- 15.19 41.61 -26.42 322 -- 48.4 <0.5 16.9 1.67 <5 12/2/1998 - 15.19 38.94 -23.75 390 -- <0.5 <0.5 0.735 <0.5 15.8 - 3/31/1999 - 15.19 35.38 -20.19 98.7 -- 6.6 0.69 0.579 2.33 6.55 - 6/4/1999 -- 15.19 36.67 -21.48 184 - 11.9 <0.5 10.3 0.669 12.6 -- 9/2/1999 -- 15.19 41.23 -26.04 4,820 - 764 <10 375 <10 191 - 11/29/1999 - 15.19 39.36 -24.17 79.1 - 4.25 <0.5 <0.5 1.14 6.54 - 3/16/2000 15.19 35.39 -20.20 <50 -- <0.5 <0.5 <0.5 <0.5 2.89 - 6/26/2000 - 15.19 37.99 -22.80 435 -- 33 0,588 12.2 2.06 6.3[2] -- 9/28/2000 -- 15.19 42.24 -27.05 165[3] 6.58 <0.5 0.618 0.669 3.62[2] - 12/19/2000 15.19 37.92 -22.73 <50 <0,5 <0.5 <0.5 <0.5 <2.5 -- 3/15/2001 - 15.19 35.73 -20.54 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] 6/20/2001 - 15.19 38.99 -23.80 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] -- 9/12/2001 - 15.19 43.29 -28.10 <50 - <2[4] <2[4] <2[4] <2[4] <2[2] - 12/12/2001 15.19 40.20 -25.01 <50 - <1.0[4] <1.0[4] <1.0[4] <1.0[4] 1.2[2] 3/13/2002 -- 15.19 37.21 -22.02 <50 - 0.62 <0.50 <0.50 <0.50 2.5[2] - 6/18/2002 - 15.19 37.38 -22.19 <50 - 1.5 <0.50 <0.50 1.7 2.6[2] - 9/11/2002 -- 95.19 44.49 -29.30 <50 -- 1.1 <0.50 <0.50 <0.50 3.0[2] - Report Date:October 29,2005 Page 6 of 24