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k`i KLEINFELDER S AIR QUALITY SOLID WASTE ASSESSMENT TEST A Solid Waste Air Quality Assessment Test (SWAQAT) was performed at the Foothill Sanitary Landfill by Emcon Associates during the fall of 1988. The Foothill Sanitary Landfill is a Category I site under the testing guidelines prepared by the California Air Resources Board. Therefore, the SWAQAT investigation included the following activities: o Screening surface emissions. o Measuring the composition of landfill gas. o Monitoring ambient air at the site. o Evaluating subsurface migration of landfill gas. These activities are described in more detail in Emcon Associates' report entitled "Air Quality Solid Waste Assessment Test, Foothill Sanitary Landfill, San Joaquin County, California," dated September 1988. A copy of this report is included in Appendix G. 5.1 SUMMARY OF ACqIVITIES AND FINDINGS The approximate locations of the monitoring facilities installed and used by Emcon Associates are shown on Figure 1 of the Emcon AIR SWAT Report (Appendix G). Surface emissions were screened on a 50,000-square foot integrated surface walk grid over the landfill. Screening was performed with an Organic Vapor Analyzer (OVA 128), which can detect concentrations of total organic compounds ranging from 2 to 1,000 parts per million by volume (ppmv). Measurements were made approximately three inches above the landfill surface. Benzene and 1,1,1-trichloroethane were detected in the surface sampling at concentrations of 0.45 ppb and 0.25 ppb. The concentrations were below their respective regulatory detection of 2 ppb and 0.5 ppb limits. No other volatile organic constituents were detected. 5.1.1 Composition Of Landfill Gas wells were installed. The location of the wells is shown on Figure Five landfill gas sampling � 2 of the Emcon AIR SWAT Report (Appendix G). These wells are driven approximately 8 FOOTHILL 31