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TABLE 1 <br /> HISTORICAL GROUNDWATER DATA <br /> Former Discovery Chevrolet <br /> 161511'Street <br /> Tracy, California <br /> Well. No./ Date Total Depth to Groundwater Floating Chlorinated <br /> Elev.' Sampled Depths Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes TPHd O&G Hydrocarbons <br /> (ft.) (£t.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-1/ 09/16/94 20.0 9.97 35.03 ---- 640 35 40 6.8 72 na na na <br /> 45.00 03/08/95 20.0 10.05 34.95 --- 3,900 730 510 140 430 na na na <br /> 05/17/95 20.0 10.02 34.98 ---- 400 120 36 12 43 na na na <br /> 08/07/95 20.0 10.98 34.02 ---- 1,400 250 170 64 170 na na na <br /> 12/20/95 20.0 9.86 35.14 ---- 17,000 3,100 2,000 670 2,400 na na na <br /> 02/20/96 20.0 9.25 35.75 -- 3,300 880 310 230 390 na na na <br /> 05/13/96 20.0 9.94 35.06 ---- 5,800 980 510 320 730 na na na <br /> MW-2/ 09/16/94 19.5 10.07 34.91 ---- 7,600 370 180 260 680 na na na <br /> 44.98 03/08/95 19.5 10.12 34.86 - 11000 180 47 57 180 na na na <br /> 05/17/95 19.5 10.08 34.90 ---- 100 37 11 5.5 21 na na na <br /> 08/07/95 19.5 10.89 34.09 ---- 60 10 3 2 9 na na na <br /> 12/20/95 19.0 9.98 35.00 ---- 9,700 1,000 150 480 1,100 na na na <br /> 02/20/96 19.5 9.62 35.36 ---- 8,600 800 150 430 1,000 na na na <br /> 05/13/96 19.5 10.04 34.94 ---- 8,200 740 160 390 1,200 na na na <br /> MW-3/ 09/16/94 19.5 10.49 35.10 ---- <50 <0.5 <0.5 <0.5 <0.5 <50 <10,000 na <br /> 45.59 03/08/95 19.5 10.65 34.94 --- <50 <0.5 <0.5 <0.5 <0.5 200 <1,000 na <br /> 05/17/95 19.5 10.66 34.93 ---- <50 <0.5 <0.5 <0.5 <2 <50 <1,000 na <br /> 08/07/95 19.5 11.53 34.06 ---- <50 <0.5 <0.5 <0.5 <0.5 <50 <1,000 na <br /> 12/20/95 19.5 10.49 35.10 ---- <50 <0.5 <0.5 <0.5 <0.5 <50 <1,000 nd <br /> 02/20/96 19.5 10.18 35.41 -- <50 <0.5 <0.5 <0.5 <0.5 60 na nd <br /> 05/13/96 19.5 10.51 35.08 ---- <50 <0.5 <0.5 <0.5 <0.5 <50 na nd <br /> Notes: <br /> Groundwater depths measured from surveyed top of the north side of the well casing. Well casing elevations surveyed to MSL by Virgil Chavez Land Surveying(PIS 6323). <br /> TPHg = Total Petroleum Hydrocarbons as gasoline <br /> TPHd = Total Petroleum Hydrocarbons as diesel ppb =parts per billion nd = none detected at or above laboratory reporting limits <br /> O&G = Oil and Grease ft. = feet na = not analyzed <br /> 8146.03-1 <br />