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U <br />It is anticipated that the installation of the wells will begin in December 2007 or as <br />weather permits. <br />•ll <br />CAL/OSHA safety rules and regulations we will follow fully and completely during <br />this project. Personnel working near the construction area will be required to <br />wear hard hats, safety glasses and safety vests. All personnel will be advised to <br />avoid contact with refuse. <br />6.2 SITE CONDITIONS <br />The work does not include excavation of refuse or contact with refuse; however, <br />the work is in the vicinity of buried refuse and other materials. Potential hazards <br />exist due to the presence of buried refuse, including those associated with landfill <br />gas (LFG) and the refuse itself. <br />6.3 LANDFILL GAS <br />When buried in a landfill, refuse and other organic material produces landfill gas <br />(LFG). LGF is approximately 50 percent methane by volume and may contain <br />other contaminants. 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 />1. Fire <br />2. Explosion <br />3. Asphyxiation <br />LFG may also contain trace concentrations of organic compounds. Dilution of <br />LFG in air to below the OSHA safety limits of 0.5 percent methane (10 percent of <br />the Lower Explosive Limit) usually reduces the concentration of trace <br />components to below detection limits. <br />LFG can move through soils, especially through sandy layers that exist at the <br />Work Plan — Soil Gas Monitoring Well Installation San Joaquin County <br />Corral Hollow Sanitary Landfill Public Works Department <br />Page 5 of 7 Solid Waste Division <br />