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If hydrocarbon odors are moderate to severe and are creating complaints from workers onsite, <br /> polyethylene vapor barriers should be continuously employed to cover all exposed hydrocarbon <br /> impacted soil with the exception of those locations where the actual excavation is occurring In the <br /> most serious of complaints or conditions, a change in work practices or stop work should be <br /> considered -- -�" <br /> The Occupational Health and Safety Administration(OSHA)has set limits for exposure to many of <br /> the constituents of petroleum hydrocarbon fuels Attached are MSDS's for gasoline and its most <br /> prevalent constituents These MSDS's describe the OSHA Permissible Exposure Limits (PELs), <br /> the ACGIH Threshold Limit Values (TLVs), and levels that are known to be immediately dangerous <br /> to life and health(IDLH)for some petroleum hydrocarbon constituents <br /> PEL/TLV are expressed as parts per million(ppm) except for tetramethyl and tetraethyl lead which <br /> are expressed as mg/m3 The ambient air will be monitored with a "lower explosion limit/oxygen <br /> content meter and/or handles photo ionizing detector (PID)" if deemed necessary due to moderate F— <br /> prolonged vapors or acute vapor odors As soon as vapor concentrations approach 75% of the <br /> exposure limit value,work will cease until all onsite personnel have donned protective clothing and <br /> suitable respiratory devices ---- <br /> Health and Safety Plan for F&H Construction <br /> 130 North Hunter St, Stockton,CA <br /> p'�rtP 4 <br />