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TabRel Page 5 of 31 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2133 <br /> 2908 Benjamin Holt Dr.,Stockton,California <br /> Well Depth Product Groundwater Groundwater Total <br /> Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MtBE DO <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgll <br /> E-4 615/90 17.42 -15.09 0.07 <br /> (cont.) 6/18190 18.29 -15.96 -0.87 - -- -- __ <br /> 7112190 18.25 -15.92 0.04 -- <br /> 8/16/90 18.55 -- -16.22 -0.30 <br /> 9/17/90 18.90 -16.57 -0.35 -- -- -- -- <br /> 9/19/90 18.90 -- -16.57 0.00 4,400 33 37 160 430 -- <br /> 10/11/90 18.98 -16.65 -0.08 -- -- -- -- __ <br /> 1216/90 18.82 -16.49 0.16 -- -- -- -- -- <br /> 2/12/91 18.48 -- -16.15 0.34 3,200 750 9 73 270 - <br /> 2/25/91 18.43 -16.10 0.05 -- -- -- -- -- _ <br /> 4123/91 17.62 - -15.29 0.81 -- -- _ <br /> 7/16191 20.30 -17.97 -2.68 -- -- -- -- <br /> 10/8/91 20.90 - -18.57 -0.60 -- -- -- -- __ <br /> 1/22192 19.01 -- -16.68 1.89 8,500 1,100 140 10 220 - -- <br /> 4/22192 18.05 -- -15.72 0.96 6,300 730 12 110 200 -- <br /> 7/29192 19.63 - -17.30 -1.58 7,700 1,000 14 130 310 <br /> 10/29/92 19.99 -- -17.66 -0.36 5,600 1,300 16 130 180 <br /> 1/27193 16.72 -14.39 3.27 10,000 470 26 130 270 <br /> 4/29193 14.94 - -12.61 1.78 14,000 1,300 22 280 520 <br /> 8/5/93 16.63 - -14.30 -1.69 9,400 900 <20 160 240 <br /> 11/10/93 16.92 -14.59 -0.29 4,400 290 <20 67 130 <br /> 3/21194 16.39 -14.06 0.53 5,400 340 24 110 220 -- <br /> 6/27/94 16.14 -13.81 0.25 7,800 790 11 170 470 <br /> 9/29/94 17.06 -14.73 -0.92 1,600 130 <0.5 33 41 -- <br /> 12/8/94 16.65 -14.32 0.41 5,200 940 88 170 380 <br /> 318/95 14.19 -11.86 2.46 7,900 490 5.6 130 190 -- <br /> 6/1/95 12.74 -- -10.41 1.45 15,000 1,000 10 360 380 <br /> 9/11/95 14.96 -12.63 -2.22 10,000 1,000 <10 350 320 - <br /> 12/5/95 15.23 -- -12.90 -0.27 -- -- -- -- <br /> 3/18/96 10.10 -7.77 5.13 4,700 530 35 250 350 <br /> 6/18/96 11.03 -8.70 -0.93 -- -- -- -- -- -- <br /> 9/25/96 13.47 -- -11.14 -2.44 7,600 890 <10 380 190 <5 <br /> 12/4/96 12.94 -- -10.61 0.53 -- -- -- -- -- -- -- <br /> 3/19/97 NP 7.43 -5.10 5.51 1,600 120 8.4 38 <5 0.2 <br /> 6/5/97 10.08 -7.75 .2.65 -- -- -- -- -- -- 0A ! <br /> 8119/97 NP 11.57 -9.24 -1.49 1,800 83 7.8 6.3 7.6 110 0.1 <br /> 11/25/97 P 11.27 -8.94 0.30 -- -- -- -- __ __ -- <br /> 3/19/98 NP 5.47 - -3.14 5.80 110 3.6 <0.50 <0.50 <0.50 14 3.6 <br />