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i -Page 5 of 1 s Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd.,Tracy,CA Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPH9 Benzene Toluene benzene (10tal) MtBE DO Number Sampled ft,MSL ft,TOC ft,MSL Change LftM (ug/L (ug/L (Ug/L u A- (ug/L (ug/- m IL ATR-4 4/10/1991 10.99 38.04 0,17 500 8.4 <0.5 <0.5 24 - (cont.) 7/10/1991 11,32 37.71 -0,33 190 39 <0.5 3.7 3 9/24/1991 11.57 37.46 -0.25 70 22 <.05 4.2 1.5 - 1/23/1992 11.16 37,87 0.41 1,200 300 5.2 49 72 4/20/1992 11.12 37,91 0.04 - __ - - _ 4/21/1992 - - 560 150 <5 36 29 7/8/1992 11.31 37.72 590 150 2.1 36 39 10/7/1992 11.45 37.58 414 - -_ _ -- __ _ 10/8!1992 -- - - 1,200 240 4.8 62 97 - 1/18/1993 10.45 38.58 - - - 1/19/1993 -- - 1,200 240 5.5 44 90 4/14/1993 10.87 38.16 -- _ 4/15/1993 - - - 810 160 4.2 47 63 - 8/31/1993 (a) 10.98 - - 100 33 <0.5 6 13 - 10/27/1993 10.98 -- 0.00 200 12 1.2 7.9 16 - - 2/18/1994 10.31 - 0.67 950 140 5 73 30 -- 5/20/199410.71 - -0.40 - 8,100 590 5.9 190 220 - - 10/7/1994 11.00 -- -0.29 - 1,100 301 16 7.3 - - 12/16/1994 10.61 - 0.39 1,600 310 2.3 350 200 - - 2/28/1995 10.68 - -0.07 - 4,600 180 <5 750 100 - -- 4/26/1995 10.94 - -0.26 - 1,100 19 <1 110 8.3 - 7/27/1995 11,11 - -0,17 - 1,700 12 <2.5 170 8.4 - 10/26/1995 11,18 - -0.07 - - - _ 10/27/1995 - -- - 600 7 <1 30 2 - - 2/12/1996 10.43 -- - 6,300 <0.5 <0.5 340 150 - 4118/1996 10.77 - -0.34 - 770 <1.0 <1.0 41 1.9 - - 7/18/i996 10.52 - 0.25 - 2,600 12 <5 52 <5 560 - 11/15/1996 11.51 - -0.99 » 440 <0.5 <0.5 0.8 2.2 140 - 3/14/1997 11.57 » -0.06 150 1.5 <0.5 <0.5 <0.5 870 0.07 6/4/1997 NP 10.93 0.64 - 420 8.7 1.4 1.2 1.3 5.4 0.08 8/11/1997 NP 10.55 0.38 320 2.4 1.1 <0.5 57 6.3 -- 11/17/1997 NP 11.20 - -0.65 - 420 3,3 1.4 <0.5 0,76 4.8 - -3/3011998 NP 10.38 0.82 » <50 <0.5 <0,5 <0.5 <0.5 <5,0 1.1 6/25/1998 NP 10.40 -0.02 65.8 <0.5 <0,5 <0.5 <0.5 <5,0 1 9/11/1998 NP 11.06 -0.66 - <50 <0.5 <0.5 <0.5 <0.5 <2.5 0.84 12!15/1998 NP 10.75 - 0.31 - <50 <0.5 <0.5 <0.5 <0.5 <5.0 1.1 3/17/1999 NP 10.53 - 0,22 <50 <0.5 <0.5 <0.5 <0.5 <5.0 5.7 5/14/1999 NP 10.97 -0.44 <50 0.591 <0,5 <0.5 <0.5 8,720 2.0 9/16/1999 NP 10.93 - 0.04 - <50 <0.5 <0.5 <0.5 <0.5 <5.0 6.8 12/22/1999 NP 10.89 - 0.04 <50 <0.5 <0.5 <0.5 <0.5 857 1.58 2/29/2000 NP 10.26 - 0.63 - <50 <0.5 <0.5 <0.5 <0.5 <2.5 3.1 6/7/2000 NP 11.06 -0.80 <50 <0.5 <0.5 <0.5 <0.5 8.42 - 9/25/2000 NP 11.24 -0.18 <50 <0.5 <0.5 <05 <0.5 28.0 0.70 12/29/2000 P 10.81 0.43 <50.0 <0.500 <0.500 <0.500 <0.500 636' 4,5 3/27!2001 P 10.64 - 0.17 - <50.0 <0.500 <0.500 <0.500 <0.500 <2.00' 3.1 6/20/2001 P 10,84 -0.20 - <50 <0.50 <0,50 <0.50 <0.50 <2.0' - 9/1212001 P 10.94 -0.10 - <50 <0.50 <0.50 <0.50 <0.50 <2.5 2.4 12/1912001 P 10.78 - 0.16 - <50 <0.50 <0.50 <0.50 <0.50 <2.0' 1.59 K,V5 BP ARC04o2=0=tsr4U QTR a24Tabfs 1�a�