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TABLE 2 GROUNDWATER ANALYTICAL RESULTS= rEOhllAralx MAY 1991 THROUGH FEBRUARY 1995 ' 540 North Aurora/969 East Fremont Streets Stockton, California AnalyticalResults VagfQ?� IF7r F Date: Benzene Toluene Ethylberizene Xylenes TPH-G` TPH-Ds MW1 05/07/91 0.85 1.5 1.0 2.9 41 <50 ' 06/21/91 <0.30 <0.30 <0.30 <0.30 <30 <50 08/22/91 0.41 <0.30 <0.30 <0.30 <30 <50 02/18/92 <0.50 <0.50 <0.50 <0.50 120 <50 ' 06/16/92 <0.50 0.6 <0.50 0.9 160 <50 04/01193 <0.50 <0.50 <0.50 <0.50 150 <50 ' 08/23/93 <0.50 <0.50 <0.50 <0.50 55 100 08/29/94 <0.50 <0.50 <0.50 <0.50 <50 <50 ' 02/06/95 <0.50 <0.50 <0.50 <0.50 <50 518 MW2 05/07/91 0.77 <0.30 <0.30 0.36 31 84 06/21/91 <0.30 <0.30 <0.30 <0.30 <30 68 08/22/91 0.63 <0.30 <0.30 <0.30 <30 <50 02/18/92 <0.50 <0.50 <0.50 <0.50 <50 <50 06/16/92 <0.50 <0.50 <0.50 <0.50 <50 <50 04/01/93 <0.50 <0.50 <0.50 <0.50 <50 <50 08/23/93 <0.50 <0.50 <0.50 <0.50 <50 67 ' 08/29/94 <0.50 <0.50 <0.50 <0.50 <50 <50 02/06/95 <0.50 <0.50 <0.50 <0.50 <50 <50 ' MW3 45/07/91 <0.30 <0.30 <0.30 <0.03 <30 <50 21/91 06/ <0.30 <0.30 <0.30 <0.30 <30 <50 08/22/91 <0.30 <0.30 <0.30 <0.30 <30 <50 02/18/92 <0.50 <0.50 <0.50 <0.50 <50 <50 06/16/92 NS' NS NS NS NS NS 04/01/93 <0.50 <0.50 <0.50 <0.50 <50 <50 08/23/93 <0.50 <0.50 <0.50 <0.50 <50 <50 08/29/94 <0.50 <0.50 <0.50 <0.50 <50 <50 ' 02/06/95 <0.50 <0.50 <0.50 <0.50 <50 <50 Previous analytical results from the Canonie Environmental 28 February 1995"Groundwater Monitoring and Sampling at Chevron USA Production Company, 540 North Aurora Street, Stockton, California" draft letter report. pg/1 =micrograms per liter {also known as parts per billion}. ' Monitoring well locations are shown on Figure 2. TPH-G = total petroleum hydrocarbons as gasoline. s TPH-D = total petroleum hydrocarbons as diesel. 8 The laboratory indicated that the chromatogram for this sample did not match the diesel standard. ' NS = not sampled.