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4.01 SITE CONDITIONS <br />The work does not include excavation of refuse or contact with refuse. Potential hazards exist <br />due to the presence of buried refuse, including those associated with landfill gas (LFG) and the <br />refuse itself. The following information is provided for completeness: <br />A. Landfill Gas <br />When buried in a landfill, refuse and other organic material produces landfill gas (LFG). LGF is <br />approximately 50 percent methane by volume and may contain other contaminants. Potential <br />hazards associated with LFG are due to: <br />1. Oxygen deficiency <br />2. Combustible characteristics of LFG <br />3. Potential for hydrogen sulfide in LFG <br />Potential hazards include: <br />1. Fire <br />2. Explosion <br />3. Asphyxiation <br />LFG may also contain trace concentrations of organic compounds. Dilution of LFG in air to below <br />the OSHA safety limits of 0.5 percent methane (10 percent of the Lower Explosive Limit) usually <br />reduces the concentration of trace components to below detection limits. <br />LFG can move through soils, especially through sandy layers that exist at the site. Movement <br />through soils can remove the odorous compounds of LFG, such that the LFG can be detected <br />only with the proper test equipment. <br />B. REFUSE <br />Refuse will not be excavated in this work. The landfill contains household refuse, demolition <br />debris, tree trimmings, and miscellaneous refuse. To the best knowledge of SWD, hazardous <br />materials have not been disposed at the site. <br />Potential hazards associated with the direct contact with refuse include: <br />1. Biological infection <br />2. Household hazardous waste <br />Work Plan <br />SG -16 Shallow Replacement Wells San Joaquin County <br />North County Sanitary Landfill Page 4 of 5 Public Works Department <br />Solid Waste Division <br />