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Table 9 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 P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg1L) (jug1L) (1ig1L) (irg1L) (lrg1L) (pg1L) (mg/L) Comments MW-2 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 - 19/29/1999 -- 15.19 39.36 -24.17 79.1 -- 4.25 <0.5 <0.5 1.14 6.54 -- 3/96/2000 -- 15.19 35.39 -20.20 <50 -- <0.5 <0.5 <0.5 <0.5 2.89 -- 6/26l2000 -- 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 -- 15.19 44.49 -29.30 <50 - 1.1 <0.50 <0.50 <0.50 3.0[2] -- 12/18/2002 - 15.19 41.94 -26.75 <50 -- <0.50 <0.50 <0.50 <0.50 2.5[2] -- 03/06/2003 P 15.19 39.55 -24.36 <50 - <0.50 <0.50 <0.50 <0.50 0.60[2] 1.96 06/11/2003 P 95.19 38.99 -23.80 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.66 09/23/2003 P 15.19 42.97 -27.78 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - 12/09/2003 P 15.19 41.99 -26.80 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - 03/09/2004 P 15.19 39.59 -24.40 <50 - <0.50 <0.50 <0.50 <0.50 <0.50[2] 2.44 06!23/2004 P 15.19 44.44 -29.25 <50 -- 0.63 <0.50 <0.50 <0.50 <0.50[2) 1.74 09/20/2004 P 15.19 48.69 -33.50 <50 - <2.5 <2.5 <2.5 <2.5 <2.5[2] - 12l20/2004 P 15.19 45.01 -29.82 <50 - <0.50 <0.50 <0.50 <0.50 0.60[2] 4.32 03/28/2005 P 15.19 42.05 -26.86 84 -- <0.50 <0.50 <0.50 <0.50 0.65[2] 4.6 MW-3 1/7/1992 -- 16.10 63.05 47.04 2,100 - 41 <3.0 <3.0 57 NA -- No FP,No S 2/24/1992 -- 16.10 62.37 46.63 NA NA NA NA NA NA -- No FP,No S 3/31/1992 - 16.10 62.17 46.16 NA -- NA NA NA NA NA No FP,No S 4/21/1992 - 16.10 62.51 46.41 110 -- 4.9 <0.5 <0.5 4.6 NA - No FP,No S 5/11/1992 - 16.10 63.17 47.07 NA - NA NA NA NA NA -- No FP,No S 6/23/1992 - 16.10 63.26 47.16 NA - NA NA NA NA NA -- No FP,No S Report Date:April 25,2005 Page 6 of 23