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TAML '1 HISTORICAL GROUNDWATER DATA Fortner Discovery Chevrolet 161511x' Street Tracy, California Well. No./ Date Total Depth to Groundwater Floating Chlorinated Elev.' Sampled Depth' Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd O&G Halocarbons (ft.) (ft.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-3/ 02/20/96 19.5 10.18 35.41 ---- <50 <0-5 <0.5 <0.5 <0.5 na 60 na nd 45.59 05/13196 19.5 10.51 35.08 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 na nd 08/13/96 19.5 11.49 34.11 ---- na na na na na na 60 na nd 11/21/96 19.5 10.46 35.13 ---- na na na na na <5 <50 na nd 03/18/97 19.5 10.33 35.26 ---- <50 <0.5 <0.5 <0.5 <0.5 <5 <50 na na 06/12/97 19.5 10.58 35.01 monitored only; groundwater sample not collected MW-4/ 04/04/97 20.0 10-75 34.81 ---- 415 1.1 0.5 10.9 35.5 na na na na 45.56 06/12/97 20.0 10.89 34.67 ---- <50 0.5 <0.5 2.0 3.7 <5 na Da na MW-51 04/04/97 20.0 10.21 34.93 ---- <50 <0.5 <0.5 <0.5 <0.5 na na na na 45.14 06/17/97 20.0 10.40 34.74 ---- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na Trip Blank 06/12/97 ---- ---- ---- --- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na Explanation• TPHg = Total Petroleum Hydrocarbons as gasoline Analytical Laboratory: TPHd = Total Petroleum Hydrocarbons as diesel American Environmental Network(ELAP#1172) O&G = Oil and Grease BTEX = Benzene, Toluene, Ethylbenzene, and total Xylenes Analytical Methods: MTBE = Methyl t-Butly Ether TPHg: EPA Methods5030/8015 (GCFID) nd = none detected at or above laboratory reporting limits TPHd: EPA Method 3510/8015 (GCFID) ppb = parts per billion BTEX/MTBE: EPA Method 8020 ft. = feet O&G: Standard MEthod 5520 B&F na = not analyzed Chlorinated Halocarbons: EPA 8010 ---- = not applicable Measured from surveyed top of the north side of the well casing. Well casing elevations surveyed to MSL by Virgil Chavez Land Surveying(PLS#6323). 8146.04-5 Page 2 of 2