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H. Providea list of technical documents f ite (Give date & <br /> report, e.g. WAT, Design, Control System, and Monitoring Plans) <br /> 11. LANDFILL GAS MIGRATION <br /> A. Status <br /> 1. Has an Air Quality Solid Waste Assessment Test (Air Swat) <br /> been completed for the site? (Y <br /> 2. Have surface or structure landfill gas monitoring surveys <br /> been conducted for the site? (Y <br /> 2. Does the site have a landfill gas monitoring system? <br /> (Y <br /> 3. Does the site have a landfill gas control system? (Y <br /> B. Migration <br /> 1. Do surface methane emissions exceed 500 ppm? <br /> (Y/N <br /> If unknown, conduct a field survey for presence of landfill gas. <br /> If no, based on a field observations or measurements, age and moisture <br /> content of the waste and the existing cover, are surface emissions <br /> > 500 ppm likely to occur? (Y/N) <br /> 2. Has >1.25% methane by volume accumulated in on site <br /> structures? (YIN <br /> If unknown, conduct a field structure survey for presence of landfill gas. <br /> If no, based on field measurements, the age and ,naturs of the waste, <br /> land use and cover conditions, is landfill gas accumulation likely to occur <br /> in structures on cr around the site (Y/N) <br /> 3. Do the methane concentrations exceed 5% at the site boundary? <br /> (Y/N/ <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 <br /> waste, and the existing cover, is landfill migration likely to occur beyond <br /> the boundaries of the site? (Y/N) <br /> Page 2 of 4 <br /> CIWMB Closure and Remediation Branch (1/25/93) <br />