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i I � ' TABLE 1 GEOMATRSX PREVIOUS ANALYTICAL RESULTS' 540 NORTH AURORA STREET ' Chevron Real Estate Management Company Stockton, California i Analytical Results (pg/t)2 ' Location' Date Benzene Toluene Ethylbenzene Xylenes TPH-G• TPH-D' MW-1 05/07/91 085 1 5 1 0 2 9 41 <50 ' 06/21/91 <0 30 <0 30 <0 30 <0 30 <30 <50 08/22/91 041 <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 04/01/93 <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 51e ' MW-2 05/07/91 077 <0 30 <0 30 036 3i 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 68 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 ' MW-3 05/07/91 <0 30 <0 30 <0 30 <0 03 <30 <50 06/21/91 <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 t 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 Z jig/1 = micrograms per liter (also known as parts per billion) 3 Monitoring well locations are shown on Figure 2 ` TPH-G = total petroleum hydrocarbons as gasoline s TPH-D = total petroleum hydrocarbons as diesel e The laboratory indicated that the chromatogram for this sample did not match the diesel standard NS = not sampled