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0 <br /> 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 /> No <br /> 2. Have surface or structure landfill gas monitoring surveys been conducted for the site? If yes,describe results.(Y/N) <br /> No <br /> 3. Does the site have a landfill gas monitoring system? If yes,describe(Y/N) <br /> No <br /> 4. Does the site have a landfill gas control system? If yes,describe.(Y/N) <br /> No <br /> B. Migration <br /> 1. Do surface methane emissions exceed 500 ppm? (Y/N/U) No <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) No,the waste is dry and mostly covered by concrete or asphalt <br /> 2. Has>1.25%methane by volume accumulated in on-site structures? (Y/N/U) No <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 No <br /> The site discontinued to accept waste on October 6,1975. The nearest structure is 250 feet away.That structure is a <br /> portable office and is sitting on an asphalt pad. The area where the waste is located is well drained and the waste is <br /> not in water. Gas generation is minimal. <br /> 3. Do the methane concentrations exceed 5%at the site boundary? (Y/N/U) No, <br /> Field screening at the boundary revealed 0.0%CH4 <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 No <br /> The area where the waste is located is well drained and the waste is not in water. Gas generation would be minimal. <br /> CIWMB Remediation,Closure,and Technical Services Branch Page 2 of 4 Revised September 1999 <br />