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• • O 10 of 16 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 (total) UBE DO Number Sampled 1,MSL ft,TOC ft,MSL Change(it) (fl fug/L)( u !L (ug/L (ug/L (ug/L (u/Lm /L ATR-8 1/19/1993 - -- - 980 14.0 1.7 11 34 _ (cont.) 4/14/1993 7.80 38.18 4/15/1993 -- - 110 4.2 <0.5 4.6 4,9 - 8/31/1993 9.81 36.17 - 700 15.0 15 41 71 10/27/1993 8,68 37.30 1.13 - 52,000 620 2,100 2,800 8,700 2/17/94A 8.25 37.84 0.54 0.14 -- -- _ _ 5/20/94A 8.55 $7.54 -0.30 0.14 10/7/94A 8.70 37.39 -0.15 0.14 12116/1994 8.21 37.77 0.38 sheen 2126!95^ 8.45 37.55 -0.22 0.02 4126/95A 8.51 37.86 0.31 0.50 _ 7/27/95A 9.85 36.22 -1.63 0.12 10126/95A 9.28 36.72 0.50 0.03 21121W 7.87 38.13 1.40 0.02 4/18/96A 8.45 37.55 -0.58 0.02 7/18/1995 13.95 37.03 4152 88,000 72 220 620 2,500 <500 _ 11/15/1996 9.40 36.58 -0.45 52,000 110 130 240 1,300 <200 3/14/1997 9.24 36.74 0.16 350 4.2 <0.5 1,6 26 <2,5 0.10 6/4/1997 NP 6.69 37.29 0.55 - 1,200 42 52 8.2 150 <2.5 0.03 8/11/1997 NP 9.10 36.88 -0.41 7,800 280 75 140 710 <25 11/17/1997 NP -- -- 4,200 57 <0,5 <0.5 250 <2.5 -- 3/30/1 S9B NP 8.02 37.96 - 320 1.7 <0.5 <0.5 2.4 <5.0/<2.0' 0,80 6125/1998 NP 9,69 36.29 -1.67 876 30.0 1.90 8.71 17.6 <5.0 1.40 9A iA 9% Well paved over 12115/199s NP 46.11 8.86 37,25 -- - 456 10.2 0.690 6.12 8.09 <5.0 0.70 3/17/1999 NP 8.55 37.56 -0.31 130 2.12 0,528 2.12 2.71 <5,0 2.50 5/14/1999 NP 8.81 37.30 0.26 155 1.79 <0.5 2.41 2,00 <5.0 4.20 9/16/1999 NP 9.17 36.94 0,36 - 747 27.8 1.42 9.88 8.40 <5.0 1.80 12/2211999 NP 7.99 38.12 -1.18 - 648 <0,5 0.586 5.85 5.36 <2.50 0.31 2/29/2000 NP 8.18 37.93 -0.19 142 1.60 <0.5 2.39 1.36 <2.50 6.20 WJ2000 NP 9.02 37,09 484 576 4.82 <0.500 8.43 <2.50 <12.5 -- 9/25/2000 NP 9.87 36.24 -0.85 2,720 56.3 11,4 33.1 47.3 <50.0 12/29/2000 P 8.38 37.73 1.49 -- 2,350 <5.00 <5.00 19.1 <5.00 <2.00' 5.1 3/27/2001 P 9.66 36.45 -1.28 - <50.0 <0.500 <0.500 <0.500 <0.500 <2.00' 2.7 6/20/2001 P 8.99 37.12 0,67 - 150 <1.0 <1.0 1.5 2.9 <2.0' 9/12/2001 P 9.11 37.00 -0.12 810 1.3 3.7 4.4 8.4 <2.5 1.7 12/19/2001 P 8.78 37.33 0.33 380' 0.81 <0,50 2.5 1.5 21' 0.48 3/14/2002 P 6.80 37.31 -0.02 - 170 <0.50 <0.50 0.71 <0.50 <0.50' 0.72 6/28/2002 P 9.10 37,01 -0.32 - 260 0.79 0.56 2.7 <0.5 0.82' 1.0 9/11/2002 P 9.14 36.97 -0.34 - 150 3.0 0.7 4.2 1.4 0,73' 2.3 12/17/2002 P 8,33 37.78 0.77 - 420 <2,0 <2,0 6.4 7.6 1.7' 1.4 ATR-9 10/16/1990 48.68 - - - <50 <0.5 <0.5 <0.5 <0.5 - 10/19/1990 11.11 37.57 - - - _ 1/10/1991 11.04 37.64 0.07 <50 <0.5 <0.5 <0.5 - 4/10/1991 10,82 37.86 0.22 <50 <0.5 <0.5 <0.5 <0.5 - 7/10/1991 11.06 37.62 -0.24 <50 <0.5 <0.5 <0.5 <0.5 - 9/2411991 11.29 37.39 -0.23 _ _ K:U5 BP AAMa2MaQua WtA4 QTR Wabla 1-Z3-4d.