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n <br />k <br />C <br />C <br />u <br />11 <br />v <br />The work does not include excavation of refuse or contact with refuse; however, the <br />work is in the vicinity of buried refuse and other materials. Potential hazards exist <br />due to the presence of buried refuse, including those associated with landfill gas <br />(LFG) and the refuse itself. Also, the work is in the vicinity of an oil pipeline, the <br />location of which will be marked prior to drilling. <br />1.A. Landfill Gas <br />When buried in a landfill, refuse and other organic material produces LFG. LFG is <br />approximately 50 percent methane by volume and may contain other contaminants. <br />Potential 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 />A. Fire <br />B. Explosion <br />C. Asphyxiation <br />LFG may also contain trace concentrations of organic compounds. Dilution of LFG <br />in air to below the OSHA safety limits of 0.5 percent methane (10 percent of the <br />Lower Explosive Limit) usually reduces the concentration of trace components to <br />below detection limits. <br />LFG can move through soils, especially through sandy layers that exist at the site. <br />Movement of LFG through soils can remove the odorous compounds, such that the <br />LFG can be detected only with the proper test equipment. <br />1.13. Refuse <br />Household refuse is not anticipated to be excavated in this investigation, although residue <br />from refuse burning is anticipated. The following is provided for completeness. <br />The landfill contains household refuse, demolition debris, tree trimmings, and <br />miscellaneous refuse. To the best knowledge of the County, hazardous materials have <br />not been disposed at the site. However, some items that are currently defined as <br />hazardous waste (paint, insecticides, etc.) may have been included in household waste <br />disposed at the site. <br />Work Plan -Soil Gas Well Installation Page 4 of 5 Solid Waste Division <br />Corral Hollow Landfill Public Works Department <br />