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f. Responsibility For Safety <br />Contractor is solely and wholly responsible for the safety of Contractor's <br />workers. Contractor shall follow OSHA safety standards. <br />Work is anticipated to involve contact with refuse and landfill gas. The work of <br />this contract includes excavation of refuse or contact with refuse. Other work <br />is in the vicinity of buried garbage and other materials in the sanitary landfills. <br />Potential hazards exist due to the presence of these buried materials, <br />including those associated with landfill gas (LFG) and the refuse itself. <br />3. 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 <br />contaminants. Potential hazards associated with LFG are due to: <br />a. Oxygen deficiency <br />b. Combustible characteristics of LFG <br />c. Potential for hydrogen sulfide in LFG <br />Potential hazards include: <br />• Fire <br />• Explosion <br />• Asphyxiation <br />LFG may also contain trace concentrations of organic compounds. Some of <br />these compounds are known to be hazardous in high concentrations or may <br />have carcinogenic potential. When present in LFG, such compounds are usually <br />in the parts -per -million or parts -per -billion range. Dilution of LFG in air to below <br />the Occupational Safety and Health Administration (OSHA) safety limits of 1.25 <br />percent methane (25 percent of the Lower Explosive Limit) usually reduces the <br />concentration of trace components to below detection limits. <br />LFG can move through soils, especially sand layers or along landfill liners such <br />as exist at the site. Movement through soils can remove the odorous compounds <br />of LFG, such that LFG can be detected only with electronic instruments. <br />The Contractor shall verify that trenches that workers enter meet OSHA <br />requirements for oxygen and combustible gas using portable electronic devices <br />designed for that purpose. The Contractor shall demonstrate that this equipment <br />is functional, prior to the monitoring of the trenches. <br />Contractor shall not perform work that involves heat sources, such as welding, or <br />any other work that includes temperatures that could ignite methane, in areas <br />containing leachate or landfill gas unless the safety of the area has been verified <br />by the Contractor. <br />On -Call LFG System Maintenance Contractor 4 <br />San Joaquin County Purchasing Department <br />