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When buried in a landfill, refuse and other organic material produces landfill <br /> gas (LFG). LFG is approximately 50% methane by volume and may <br /> contain other contaminants. Potential hazards asociated with LFG are due <br /> to: <br /> a. Oxygen defiency in the landfill gas <br /> b. Combustible characteristics of landfill gas. <br /> c. Potential for hydrogen sulfide in LFG. <br /> Potential hazards include: <br /> a. Fire <br /> b. Explosion <br /> c. Asphyyxiation <br /> LFG may also contain trace concentrations of organic componds. Some of <br /> these compounds are known to be hazardous in high concentrations or may <br /> have carcinogenic potential. When present in LFG, such compounds are <br /> usually in the parts-per-million or parts-per-billion range. Dilution of LFG in <br /> air to below the OSHA safety limits of 1.25% methane (25% of the lower <br /> Explosive Limit) usually reduces the concentration of trace compounds to <br /> below detection limits. LFG can move through soils, especially sand layers <br /> such as may exist at the sites. Movement through soils can remove the <br /> ordorous compounds of LFG, such that LFG can be detected only with <br /> electronic instruments. <br /> 1.04 USE OF SITE <br /> A. Foothill Sanitary Landfill <br /> Contractor's work shall be during the hours of 7.00 am to 5.30 pm Monday <br /> through Friday. The Foothill landfill will be in full operation when the work is <br /> in progress. The contractor shall not inhibit or obstruct the flow of traffic, <br /> either the landfill operations vehicles or of the refuse delivery vehicles. <br /> Contractor's foreman shall sign in all workers at the gate. Contractor's <br /> workers shall park as directed by the Landfill foreman. <br /> Soil Gas Monitoring Well Specs San Joaquin County-Public Works <br /> Foothill Sanitary Landfill& 3 Solid Waste Division <br /> Corral Hollow Sanitary Landfill Printed 10/10/2007 <br />