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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station 146..2.1 3 0 7906 N. EL Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) Cpg/L) (pg1L) (pig/L) (pglL) (,ugIL) (pglL) (pg/L) (mglL) Comments W-5- 2128/1995 - 15:10 .54.78 -39•.68 310 - .: 70- 1.4 5.9 5 NA. - Na FP,No S M 5/19/1995 -- 15.10 52.85 -37.75 66 - 8.4 <0.5 0.5 <0.5 NA - No FP,No S 8/28/1995 - 15.10 54.61 -39.51 130 - 27 <0.5 4.5 0.6 NA -- No FP,No S 1217/1995 - 15.10 53.20 -38.10 <200** - 2.1 <0.5 0.7 <0.5 NA - No FP,Na S 2/5/1996 - 15.10 50.67 -35.57 <200** - 3 <0.5 0.9 <0.5 NA -- No FP,No S 5/30/1996 - 15.10 47.70 -32.60 140*** - 15 <0.5 5.2 <0.5 <4** -- No FP,No S 9/18/1996 -- 15.10 59.56 -36.46 <300*" - 33 <0.5 9 <0.5 <3 - No FP,No S 11/26/1996 - 15.10 49.34 -34.24 <200*** - 1.9 <0.5 0.5 <0.5 <4** - No FP,No S 3!2411997 - 15.10 44.24 -29.14 <200*** -- 3.2 <0.5 1.6 3 <8`" - No FP,No S 5/20/1997 -- 15,10 44.85 -29.75 270 - 31 5 5 15 <20"* - Na FP,No S 8/19/1997 - 15.10 48.37 -33.27 100 -- 20 <0.5 3.8 <0.5 <5 - No FP,No S 11/19/1997 15.10 46.62 -31.52 <50 -- 1:2 0.94-.. <0.5 0.91 3/4/1998 -- 15.10 41.90 -26.80 <50 - 5.6 1.8 1.6 3.1 <5 -- No FP,No S 6/26/1998 -- 15.10 39.64 -24.54 <50 - 19 0.624 0.794 1 <5 - 9/1/1998 - 15.10 41.44. -26.34 <50 - 3.2 <0.5 1.39 0.535 5.15 - 12/2/1998 -- 15.10 38.74 -23.64 <50 -]!!4 693 <0.5 <0.5 <0.5 8.94 - 3/31/1999 - 15.10 35.17 -20.07 <50 - 33 0.586 <0.5 1.52 9.94 -- 6/4/1999 - 15.10 36.48 -21.38 <50 - 5.03 0.721 <0.5 1.6 7.06 -- 9/2/1999 - 15.10 41,05 -25.95 <50 - 6.14 <0.5 1.83 0.848 <5 11/29/199915.10 39.16 -24.06 <50 -- 0.585 0.633 <0.5 1.45 2.69 -- 3l1612000 - 15.10 35.16 -20.06 57.1 - 5.17 <0.5 <0.5 <0.5 4.93 - 6/26/2000 -- 15.10 37.80 -22.70 52.3 - 3.69 <0.5 2.2 0.825 <2[2] -- 9/28/2000 -- 15.10 42.05 -26.95 <50 1.34 <0.5 <0.5 <0.5 <2t2] - 12/19/2000 15.10 37.68 -22.58 <50 - 0.561 1.49 <0.5 3 56:6 3/15/2001 - 15.10 35.50 -20.40 91.6[3] -- <2[4] 6.71 [41 <2[41 <2[4] 89.2[2] -- 6/20/2001 -- 15.10 38.82 -23.72 78[3] - 2.5[4] 5.5[4] 4.7[4] 11[4] 60[2] -- 9/12/2001 15.10 43.05 -27.95 <50 - <2[4] <2141 <2[4] <2[4] 29[2] - 12/12/2001 - 15.10 39.89 -24.79 <50 -- <1.0[4] <1.0[4] <1.0[4] 1.2[4] 25[2] - � 3/13/2002 -- 15.14 36.99 -21.89 <50 -- <0.50 0.61 <0.50 <0.50 35121 -- 6/18/2002 15.10 39.19 -24.09 <50 - <0.50 0.61 <0.50 3.3 7.8[2] 9/11/2002 - 15.10 44.33 -29.23 63 - 3.4 5 1.9 14 -- 12l18/2002 - 15.10 41.68 -26.58 <50 -- <0.50 4.4 <0.50 5.8 20[2] -- 03/06/2003 P 15.10 39.34 -24.24 1 <50 - 1.5 1 1.7 L0.51 3.2 3.0[2] 0.56 Page 11 of 23 Report Date:April 25,2005