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November 14, 1991 ���A <br /> Beacon Station No. 492, Manteca, California <br /> local topography allows, approximately 25 to 75 feet of space surrounding those Exclusion <br /> Zones will be designated as Contamination Reduction Zones. <br /> Cones, wooden barricades, or a suitable alternative will be used to deny public access to <br /> these Contamination Reduction Zones. The general public will not be allowed close to the <br /> work area under any conditions. If for any reason the safety of a member of the public <br /> (e.g., motorist or pedestrian) may be endangered, work will cease until the situation is <br /> remedied. Cones and warning signs will be used when necessary to redirect motorists or <br /> pedestrians. <br /> EXPOSURE MONITORING PLAN <br /> It is not anticipated that project personnel exposure will exceed the TLVs or PELs of the <br /> materials; however, proper personal protective equipment will be worn while working at the <br /> site. In addition, the work area will monitored using a direct-reading combustible gas <br /> analyzer or an organic vapor meter to detect the concentration of the volatile hydrocarbons <br /> in the ambient atmosphere. <br /> If the lowest TLV or PEL is consistently being exceeded in the breathing zone, then a <br /> respirator must be worn. If the concentration exceeds 1,000 parts per million (ppm), the use <br /> of a respirator is inappropriate and personnel must withdraw from the site. <br /> POSSIBLE EXPLOSIVE ATMOSPHERES <br /> Gasoline has a flammable range from approximately 1.4 to 7.6 percent in air. One percent <br /> in air is equivalent to 10,000 ppm; thus the lower explosive limit (LEL) is 14,000 ppm. <br /> Normally explosive levels may be reached in tanks, pits, or other confined spaces. Any area <br /> suspected of containing potentially explosive levels of gasoline will be evaluated with an <br /> intrinsically safe or explosion-proof combustible gas indicator (CGI). Personnel response <br /> will be based on the following action levels from CGI readings: <br /> Less than 10 then Continue activities and <br /> percent of LEL* monitoring <br /> 10 to 25 percent then Continue monitoring <br /> of LEL with extreme caution as <br /> higher levels are <br /> encountered <br /> 86102-7s 13 <br />