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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 Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MItBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pglL) (pglL) (trgll-) (grg/L) (pg/L) (mg1L) Comments MS-3A 06/20/2005 P -- 42.07 -- 380 -- 5.1 0.59 1.5 0.85 71[2] 3.90 Water level taken 6/19/05 09/11/2005 P -- 46.51 -- 170 J -- 15 J 1.4 J 6.2 J 1.8 J 110[2]J 4.50 MS-3B 12/19/2002 - 41.84 - 1,200 - 26 1.4 27 <0.50 7.1[2] - 03/06/2003 P - 39.23 1,100 - 6.8 3.5 7.1 5.6 19[2] 2.0 06/11/2003 NP - 38.49 - <50 -- <0.50 <0.50 <0.50 <0.50 9.4[2]J 4.19 09/24/2003 NO -- 42.53 -- <50 <0.50 <0.50 <0.50 <0.50 0.65[2] - .12/1012003 P -- 41.86 -- 190 -- 26 30 5.9 37 0.63[2] - 03/09/2004 - - 39.28 - 1,200 - 35 0.52 7.5 <0.50 3.2[2] -- 06/24/2004 NP - 43.21 - 120 - <2.5 <2.5 <2.5 <2.5 <2.5[2] 1.92 Water levels taken on 6123104 09/20/2004 P - 48.02 - <50 -- <2.5 <2.5 <2.5 <2.5 <2.5[2] 0.80 12!2012004 -- - - -- - - - - -- Not Sampled 03/28/2005 P - 42.50 - <50 -- 1.8 <0.50 <0.50 0.64 33[2] 5.0 06/20/2005 P -- 42.07 - 62 -- 4.2 1.1 1.6 1.5 36[2] 1.90 Water level taken 6119/05 09111/20051 P 1 46.55 - 410 J - 51 J 37 J 22 J 59 J 38[2]J 3.0 MW-1 11711992 - 14.58 61.48 -46.90 18,000 - 1,600 610 140 8.5 NA - No FP,No S 2/24/1992 -- 14.58 60.76 -46.18 NA NA NA NA NA NA -- No FP,No S 3/31/1992 -- 14.58 60.56 -45.33 NA -- NA NA NA NA NA -- No FP, No S 4/21/1992 - 14.58 60.91 -46.33 5,200 - 1,400 360 53 260 NA - No FP,No S 5/11/1992 - 14.58 61.57 -46.99 NA -- NA NA NA NA NA - No FP, No S 6/23/1992 - 14.58 61.68 -47.10 NA -- NA NA NA NA NA -- No FP,No S 7/8/1992 -- 14.58 62.84 -48.26 6,500 -- 1,900 320 89 230 NA INo FP,No S 8/10/1992 - 14.58 63.74 -49.16 NA - NA NA NA NA NA -- No FP,No S 9/15/1992 -- 14.58 64.37 -49.79 NA -- NA NA NA NA NA - No FP, No S 10/6/1992 -- 14.58 64.52 -49.94 11,000 2,500 600 210 470 NA -- No FP,No S 11/11/1992 -- 14.58 63.83 -49.25 NA -- NA NA NA NA NA -- No FP,No S 12/4/1992 - 14.58 63.10 -48.52 NA -- NA NA NA NA NA - No FP,No S 1/20/1993 - 14.58 61.83 -47.25 1,800 - 260 100 10 34 NA -- No FP,No S 3/22/1993 -- 14.58 59.95 -45.37 NA -- NA NA NA NA NA -- No FP, No S 4/6/1993 -- 14.58 59.47 -44.89 1,500 250 64 30 76 NA - No FP,No S 7/30/1993 -- 14.58 60.19 -45.61 2,100 - 390 130 38 79 NA - No FP,No S 11/29/1993 -- 14.58 59.29 -44.71 1,200 -- 230 12 11 16 NA -- No FP,No S Report Date:October 21,2005 Page 3 of 24