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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA TOC Depth to Water Level IEthyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pglL) (pg1L) (pglL) (pg/L) (pg/L) (erg/L) (pg/L) (mg/L) Comments MW-1 3/23/1994 -- 14.58 54.33 -39.75 1,900 - 120 8.2 25 7.5 NA -- No FP,No S 6/22/1994 -- 14.58 54.11 -39.88 910 -- 13 4 4.1 1.9 NA - No FP,No S 9/28/1994 - 14.58 58.97 -43.59 420 -- 6.8 1.4 2.9 <0.5 NA - No FP, No S 12/1/1994 - 14.58 57.11 -42.53 220 - 2.4 <0.5 <0.5 <0.5 NA -- No FP,No S 2/28/1995 - 14.58 54.21 -39.63 340 -- 2.1 <0.5 0.6 <0.5 NA No FP,No S 5/19/1995 -- 14.58 52.41 -37.83 210 - 2.9 <0.5 0.7 <0.5 NA - No FP,No S 8/28/1995 -- 14.58 54.04 -39.46 240 - 3.2 <0.5 1 <0.5 NA -- No FP,No S 1217/1995 -- 14.58 52.67 -38.09 190 -- 1.7 <0.5 <0.5 <0.5 NA -- No FP,No S 2/5/1996 - 14.58 50.11 -35.53 230 -- 2.5 <0.5 0.5 <0.5 NA - No FP,No S 5/30/1996 - 14.58 47.17 -32.59 180*** - 1.2 <0.5 <0.5 <0.5 <4** - No FP,No S 9/18/1996 -- 14.58 50.96 -36.38 200 -- 1.6 <0.5 <0.5 <0.5 <5" -- No FP,No S 11/26/1996 - 14,58 48.80 -34.22 220 - 1.5 <0.5 <0.5 <0.5 5 - No FP,No S 3/24/1997 -- 14.58 43.73 -29.15 <50 -- <0.5 <0.5 <0.5 <0.5 <3 - No FP, No S 51/20/1997 -- 14.58 44.32 -29.74 230 -- <7`* <0.6- <0.5 0.5 <5** - No FP,No S 8/19/1997 14,58 47.78 -33.20 200 6.5 <0.5 <0.5 <0.5 <5 - No FP,No S 1111911997 - 14.58 45.95 -31.37 170 - 7 0.77 <0.5 0.63 <5 -- 3/4/1998 - 14.58 41.33 -26.75 <50 -- 0.51 <0.5 <0.5 <0.5 <5 - No FP,No S 6/26/1998 -- 14.58 39.13 -24,55 248 - 1.73 <0.5 <0.5 <0.5 <5 -- 9/1/1998 -- 94.58 40.89 -26.31 249 - 5.19 <0.5 <0.5 <0.5 <5 -- 12/2/1998 -- 14.58 38.20 -23.62 227 -- <0.5 <0.5 <0.5 <0.5 12.7 -- 3/31/1999 - 94.58 34.68 -20.10 152 - <0.5 <0.5 <0.5 <0.5 <5 6/4/1999 - 14.58 35.98 -21.40 168 - 2.63 <0.5 <0.5 <0.5 10.9 -- 9/2/1999 -- 94.58 40.49 -25.91 232 - 1.04 <0.5 <0.5 <0.5 <5 -- 11/29/1999 -- 14.58 36.64 -24.06 129 - <0.5 <0.5 <0.5 <0.5 <2.5 -- 3/16/2000 - 14.58 34.66 -20.08 55.2 -- <0,5 <0.5 <0.5 <0.5 <2.5 - 6/26/2000 - 14.58 37.26 -22.68 175 <0.5 <0.5 <0.5 <0.5 <2[2] - 9/28/2000 - 14.58 41.49 -26.91 86.9[3) - 2.14 <0.5 <0,5 <0.5 <2[2] - 12119/2000 - 14.58 37.17 -22.59 <50 <0.5 <0.5 <0,5 <0.5 <2.5 - 3/15/2001 -- 14.58 35,00 -20.42 <50 -- <2[4) <2[4] <2[4] <2[4] <2[2] - 6/20/2001 -- 14.58 38.27 -23.69 <50 - <2[4) <2[4] <2[4] <2[4] <2[2] - 9/12/2001 -- 14.58 42.47 -27.89 <50 - <2[4] <2[4] <2[4] <2[4] <2[2) -- 12/12/2001 -- 14.58 39.36 -24,78 <50 -- <1.0[4] <1.0[4] <1.0[4] <1,0[4] 0.54[2) - 3/13/2002 -- 14.58 36.46 -21.88 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2) -- Report Date:October 21,2005 Page 4 of 24