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Table 7 Groundwater Elevation and Analytical Data(CHEVRON) Chevron Service Station#9-4275 2905 Benjamin Holt Drive Stockton,California Well Groundwater Depth Ethyl- Xylenes Well Date Elevation Elevation to Water TPHg Benzene Toluene benzene (total) MtBE ID Sampled A MSL) M MSL) (/t TOC) (ug/1) (ug/1) (u9/1) (ug/1) (uglo (ugn) MW-5 09111/95 -12.40 16.19 890 40 3.8 76 140 - (cont.) 12/05/95 -13.01 16.80 410 6.7 <0.5 11 43 _ 03/18/96 451 13.30 740 10 <0.5 38 66 -- 06l18196 -9.17 12.96 7,200 86 6.7 770 540 15 09/24196 -11.00 14.79 12,000 74 5.0 760 1,100 59 12!04!96 -10.83 14.62 1,100 8.3 1.0 93 63 <5.0 02!25197 -6.63 10.42 24,000 570 1,400 1,500 5,300 <50 05/06197 -7.46 11.25 38,000 580 790 3,000 12,000 <120 09/29197 -10.30 14.09 15,000 300 <12 1,500 1,000 <120 11/25/97 -10.35 14,14 8,300 290 <50 770 450 <250 03/26/98 -4.06 7.85 <50 <0.5 <0.5 <0.5 <0.5 <2.5 06124!98 -5.77 9.56 <50 <0.5 <0.5 0.64 <0.5 100 09/10/98 -7.79 11.58 100 3.6 1.5 10 5.8 4.7 12/17/98 -7.61 11.40 52 1.2 <0.5 3.9 2.3 680 03110/99 -5.90 9.69 <50 <0,5 <0.5 0.61 <0.5 19 06/22/99 -6.36 10.15 <50 <0.5 <0.5 <0.5 <0.5 <2.0 09113/99 -9.02 12.81 1,900 20 3.4 130 85 32 12116/99 -8.90 12.69 2040 8.71 4.85 137 99.6 10.5 03101/00 -4.16 7.95 90.6 <0.5 <0,5 <0.5 1.47 4.15 06/13/00 -6.40 10.19 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 09113/00 -8.45 12.24 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 12/14100 -8.01 11.80 <50.0 <0.500 <0.500 <0.500 <1.50 6.00 03!02101 (S) -6.54 10.33 <50 <0.50 <0.50 <0.50 <0.50 4.717.5' 03102/01' (K) -6.54 10.33 <50 <0.50 <0.50 <0.50 <0.50 6.1 05/10101 -5.70 9.49 <50 <0.50 0.54 0.55 0.63 0.8 08/21101 -8.58 12.37 62.0 <0.50 <0.50 0.95 <0.50 <0.50 12/05101 -8.32 12,11 64.0 <0,5 <0.5 <0.5 0.5 <0.5 03/11/02 -6.07 9.86 <50 <0.5 <0.5 <0.5 <0.5 0.6 06/07102 -6.92 10.71 <50. <0.5 <0.5 <0.5 <0.5 <0.5 09124!02 -9.02 12.81 130. <0.5 <0.5 4. 1. <2. 12/17/02 -8.51 12.30 <50. <0.5 <0.5 0.9 <0.5 <2. 03/18/03 -7.28 11.07 <50 <0.5 <0.5 <0.5 <0.5 7 06/17/03 -7.30 11.09 <50 <0.5 <0.5 <0.5 <0.5 3 09124/03 -9.03 12.82 180 <0.5 <0.5 7 2 34 12/18/03 -8.86 12.65 1,400 2 <0.5 57 19 91 03/23/04 -6.60 10.39 180 0.7 <0.5 4 0.5 70 06/22104 -8.45 12.24 240 3 <0.5 5 0.9 10 09121/04 -9.46 13.25 4,200 16 <0.5 170 88 45 MW-6 03/11192 1.43 -15.56 16.99 - -- - - 03!17192 -15.52 16.95 3,900 63 23 370 57 - 06/29192 -17.05 18.4S 750 4,0 3.0 49 ND - 12/10192 -17.65 19.08 700 ND 3.2 3.4 0.6 - 02/04/93 -15.56 16.99 620 ND 1.7 0.3 NO - 05/18193 -13.75 15.18 760 ND 3.7 1.5 6.0 - 08l05193 -14.62 16.05 1,300 ND 7.7 3.9 1.6 - 11/09/93 -15.16 16.59 630 3.5 1.4 ND 0.8 _ 01/18/94 -14.82 16.25 470 6.1 2.8 1.4 0.8 - 06/27/94 -14.13 15.56 320 3.5 1.1 16 3.5 - 09/29/94 -15.27 16.70 780 8.0 2.5 49 5.5 _ 12/08/94 -14.92 16.35 430 3.2 3.4 3.9 1.5 03108/95 -12.72 14.15 90 <0.5 <0.5 <0.5 <0.5 _ 06/01/95 -11.18 12.61 1,500 8.9 0.5 120 4.7 _ 09/11195 -12.99 14.42 1,200 11 1.1 120 <1.0 _ 12105/95 -13.47 14.90 2,000 63 <5.0 200 19 - 03/18196 -9.43 10.86 220 2.6 <0.5 <0.5 <0.5 06/18/96 -9.60 11.03 300 3.5 <0.5 <0.5 <0.5 18 09/24196 -11.35 12.78 870 44 <0.5 0.9 1.3 47 lAChevron%94275%PeriodiC MonitoringlQ M M94275_QMR.xI5 6 of t2