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5.1 SAFETY STANDARDS <br />CAL/OSHA safety rules and regulations we will follow fully and completely during this <br />project. Personnel working near the construction area will be required to wear hard hats, <br />safety glasses and safety vests. All personnel will be advised to avoid contact with <br />refuse. <br />5.2 SITE CONDITIONS <br />The work does not include excavation of refuse or contact with refuse; however, the work <br />is in the vicinity of buried refuse and other materials. Potential hazards exist due to the <br />presence of buried refuse, including those associated with landfill gas (LFG) and the <br />refuse itself. Also, the work is in the vicinity of an oil pipeline, the location of which will be <br />clearly marked prior to excavation. <br />5.3 LANDFILL GAS <br />When buried in a landfill, refuse and other organic material produces landfill gas (LFG). <br />LGF is approximately 50 percent methane by volume and may contain other <br />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 LFG in air <br />to below the OSHA safety limits of 0.5 percent methane (10 percent of the Lower <br />Explosive Limit) usually reduces the concentration of trace components to below <br />detection limits. <br />LFG can move through soils, especially through sandy layers that exist at the site. <br />Movement through soils can remove the odorous compounds of LFG, such that the LFG <br />can be detected only with the proper test equipment. <br />Work Plan — Soil Gas Monitoring Well (GW1-A) Installation San Joaquin County <br />Corral Hollow Sanitary Landfill Public Works Department <br />April 3, 2008 Page 5 of 7 Solid Waste Division <br />