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i • • Table 4 Analytical Results of Soil Vapor Treatment Analysis Arco Service Station No,548 1612 Hammer Lane,Stockton,California Blower Flow Rate Blower Inf.Press. Sample Analyses(ppmv) Date (scfm) (in H2O) Location TPHg Benzene Toluene Ethylbenzene Xylenes MtBE 10/20/03 54.00 10.5 INF Cat Air 220 <0.16 0.92 2.3 34 <0.56 EFF Air <2.8 <0.032 <0.026 <0.024 <0.024 <0.11 11/18/03 42,30 B.0 INF Air 310 <0.08 <0.065 0.62 26 <0,28 EFF Air <2.8 <0.032 <0.026 <0.024 0.20 <0.11 12/22/03 42.30 7.2 INF Cat Air 190 <0.16 1.0 0.35 10 <0.56 EFF Air <2,8 <0.032 <0.026 <0.024 <0,024 <0.11 01/13/04 44.00 6.9 INF Cat Air 13 <.032 <0.026 <0.024 0.95 0.25 EFF Air 2.8 0.032 <0.026 <0.024 <0.024 <0.11 02/10/04 45.70 8,4 INF Air 3 <.032 <0.026 <0.024 <0.024 <0.11 EFF Air 2.8 0.032 <0.026 <0.024 <0.024 <0.11 03/11/04 70.00 7.6 INF Cat Air <14 <0.15 <0.13 <0.11 <0.23 <0.14 EFF Air <14 <0.15 <0.13 <0.i 1 <0.23 <0.14 San Joaquin Valley Unified Air Pollution Control District Permit#N-4124-1-0 Conditions are as follows: Either the VOC control efficiency shall not be less than 95%,or the total VOC emissions rate shall not exceed 2 pounds in any one day. The minimum operating temperature for the combustion chamber of the catalytic oxidizer shall be maintained at or above 600 degrees F. The total VOC emission rate from the soil remediation system served by the catalytic oxidizer shall not exceed 6.6 pounds in any one day. TPHg =Total petroleum hydrocarbons as gasoline in H2O =Inches Mercury MtBE =Methyl tert-butyl ether scfm =Standard cubic feet per minute ppmv =Parts per million by volume Please Note:Data starts at 4003 Table 4 O&M-0548-1 QMr04 1 of 1