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El <br />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 />