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II. Landfill Gas Migration <br /> A. Status <br /> 1. Has an Air Quality Solid Waste Assessment Test(Air SWAT)been completed for the site? If yes,describe results.(Y/N) <br /> 2. Have surface or structure landfill gas monitoring surveys been conducted for the site? If yes,describe results.(Y/N) <br /> 3. Does the site have a landfill gas monitoring system? If yes,describe(Y/N) <br /> 4. Does the site have a landfill gas control system? If yes,describe.(Y/N) <br /> B. Migration <br /> 1. Do surface methane emissions exceed 500 ppm? (Y/N/U) <br /> If unknown,conduct a field survey for presence of landfill gas. <br /> If no,based on field observations or measurements,age,and moisture content of the waste and the existing cover,are <br /> surface emissions>500 ppm likely to occur? (Y/N) <br /> 2. Has>1.25%methane by volume accumulated in on-site structures? (Y/N/U) <br /> If unknown,conduct a field structure survey for presence of landfill gas. <br /> If no,based on field measurements,the age and nature of the waste,land use,and cover conditions,is landfill gas <br /> accumulation likely to occur in structures on or around the site? (Y/N)Reasons <br /> 3. Do the methane concentrations exceed 5%at the site boundary? (Y/N/U) <br /> If unknown,conduct perimeter field survey for landfill gas migration. <br /> If no,based on a perimeter field survey,age and moisture content of the waste,and the existing cover,is landfill gas <br /> migration likely to occur beyond the boundaries of the site?(Y/N)Reasons <br /> CIWMB Remediation,Closure,and Technical Services Branch Page 2 of 4 Revised October 1998 <br />