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r TABLE 1 Groundwater Elevation and Analytical Data ARCO Service Station No.2186 3212 North California Street,Stockton,California TOC Static Water[l] Screen Groundwater Ethyl- Total Well Sample Elevation Level Interval Elevation Groundwater TPHg Benzene Toluene benzene Xylenes MtBE[3] Sarnpje No. Date ft msl ft b s ft b s ft msl Flow Direction p ligIL p Observations MW-3 9/25/1995 14.55 57.90 55.3-74.3 -43.35 SE <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S 10/23/1995 NM NM --- NA NA NA NA NA NA Not observed 12/22/1995 53.59 -39.04 E <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S 2/16/1996 49.99 -35.44 E <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S 5/23/1996 45.19 -30.64 E <50 <0.5 <0.5 <0.5 <0.5 <3.0 No FP,No S 9/19/1996 53.26 -38.71 NE <50 <0.5 <0.5 <0.5 <0.5 <3.0 No FP,No S 11/27/1996 50.51 -35.96 SE <50 <0.5 <0.5 <0.5 <0.5 <3.0 No FP,No 3/21/1997 41.97 -27.42 SE <50 <0.5 <0.5 <0.5 <0.5 <3.0 No FP,No 5/22/1997 43.61 -29.06 E-NE <50 <0.5 <0.5 <0.5 <0.5 <3.0 No FP,No S 8/20/1997 49.43 -34.88 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 11/20/1997 48.82 -34.27 E <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 2/17/1998 44.18 -29.63 E-SE <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 6/24/1998 35.59 -21.04 E <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 9/21/1998 39.07 -24.52 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 12/14/1998 37.14 -22.59 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 3/31/1999 34.22 -19.67 N-NE <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 6/11/1999 34.01 -19.46 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 9/10/1999 38.10 -23.55 E-NE <50 <0.5 4.5 <0.5 <0.5 <5.0 No FP,No S 12/3/1999 38.12 -23.57 E <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S 4/3/2000 34.85 •20.30 NE <50 <0.5 <0.5 <0.5 <0.5 <5.0 No FP,No S 6/22/2000 34.90 -20.35 E <50 <2.0 <2.0 <2.0 <2.0 <2.0[41 No FP,No S 9/27/2000 40.07 -25.52 E-NE <50 <0.5 <0.5 <0.5 <0.5 4.98[4] No FP,No S 10/19/2000 39.96 -25.41 E-NE NA NA NA NA NA NA Not observed 12/20/2000 38.11 -23.56 E-NE <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S 3/16/2001 37.03 -22.48 E-NE <50 <0.5 <0.5 <0.5 <0.5 <2.0[4] No FP,No 6/21/2001 39.70 -25.15 NE <50 <0.5 <0.5 <0.5 <0.5 <2.0[4] No FP,Na 9/13/2001 45.40 -30.85 E-NE <50 <0.5 <0.5 <0.5 <0.5 <2.0[41 No FP,No S 12/11/2001 42.81 -28.26 NE <50 <0.50 <0.50 <0.50 <0.50 <2.0 141 No FP,No S 3/14/2002 39.76 -25.21 E-NE <50 <0.50 <0.50 <0.50 <0.50 <0.50141 No FP,No S 6/19/2002 41.97 -27.42 E-NE <50 <0.50 <0.50 <0.50 <0.50 <0.50[4] No FP,No S 9/12/2002 48.78 -34.23 E-NE <50 <0.5 <0.5 <0.5 <0.5 <0.5 No FP,No S 12/3/2002 45.97 -31.42 E-NE <50 <0.5 <0.5 <0.5 <0.5 <0.5 No FP,No S 3/11/2003 46.39 -31.84 NE <50 <0.5 <0.5 <0.5 <0.5 <0.5 No FP,No S 6/9/2003 43.18 -28.63 E-NE <50 <0.5 <0.5 <0.5 <0.5 <0.5 No FP,No S 9/16/2003 50.86 -36.31 NE <50 <0.5 <0.5 <0.5 <0.5 <0.5 No FP,No S 12/11/2003 46.20 -31.65 NE-SW <50 <0.5 <0.5 <0.6 0.84 0.81 No FP,No S KmprmessU5 BP ARC010218 ouartedy%4 OTR=186 GWMR 4003 Page 3 of 8