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•s 'S.t <br /> t <br /> 21 <br /> N <br /> TABLE 1 <br /> HISTORICAL GROUNDWATER DATA <br /> Former Discovery Chevrolet <br /> 161511th Street <br /> Tracy, California <br /> Ethyl <br /> Well Date Total Well Depth to Groundwater Floating TPHg Benzene Toluene benzene Xylenes TPHd J&( <br /> No. Sampled Depth Elevation' water' Elevation Product <br /> (ft.) (ft.) (ft.) (ft.) (ft). (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppn <br /> MW-1 . 09/16/94 20.0 45.00 9.97 35.03 --•- 640 35 40 6.8 72 NA NA <br /> 03/08/95 20.0 45.00 10.05 34.95 ---- 3,900 730 510 140 430 NA NA <br /> 05f(7/95 20.0 45.00 (0.02 34.98 ---- 400 120 36 12 43 NA NA <br /> MW-2 09/16/94 19.5 44.98 10.07 34.91 --•- 7,600 370 180 260 680 NA NA <br /> 03/08/95 19.5 44.98 10.12 34.86 -•- 1,000 180- 47 57 1180 NA NA <br /> 05f17195 19.5 44.98 10.08 34.90 ---- 100 37 11 5.5 21 NA NA <br /> MW-3 09f16/94 19.5 45.59 10.49 35.10 --- <50 <0.5 <0.5 <0.5 <0.5 <50 <10 <br /> 03/08/95 19.5 45.59 10.65 34.94 -- <50 <0.5 <0.5 <0.5 <0.5 200 <1 <br /> 05f17195 19.5 45.59 10.66 34.93 --- <50 <0.5 <0.5 <0.5 <2 <50 ( <1 <br /> Notre ` � <br /> 'r,roundwate r depths measured from surveyed top of the north side of the well casing. Well casing elevations surveyed to mean sea level (MSL)by Virgil Chavez Land Survayin <br /> (P" No. 6323). <br /> TPHg - Total petroleum hydrocarbons as gasoline ppb = parts per billion <br /> Md. - Total petroleum hydrocarbons as diesel ppm = parts per milliom <br /> o O&G - Oil and Grease ft. = feet <br /> D NA .Not analyzed <br /> r <br /> m <br /> v <br /> m <br /> 9146.01.2 <br /> 0 <br /> A <br />