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5.1 Safety Standards <br />CAL/OSHA safety rules and regulations will be followed during this work. Personnel <br />working near the construction area will be required to wear hard hats, safety glasses <br />and safety vests. All personnel will be advised to avoid contact with refuse if <br />incountered. <br />5.2 Site Conditions <br />The work does not include excavation of refuse or contact with refuse; however, the <br />work is near 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 <br />be clearly marked prior to excavation. <br />Landfill Gas <br />When buried in a landfill, refuse and other organic material produces landfill gas <br />(LFG). LFG 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 <br />air 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 <br />LFG can be detected only with the proper test equipment. <br />Work Plan —Groundwater Monitoring Well Installation 6 San Joaquin County <br />Corral Hollow Sanitary Landfill Public Works/Solid Waste <br />