WORK PLANS - Laserfiche WebLink

Home Browse Search

f , i Petroleum fuel consists of hundreds of chemical compounds. There are certain compounds such as benzene that present significant hazards and must be properly J. controlled. To do so, a working limit of 100 ppm total hydrocarbon is proposed as the maximum acceptable level of exposure without respiratory protection. In a typical { situation with 1% of the hydrocarbon vapors being benzene; a 100 ppmv concentration I of total hydrocarbon will result in a breathing zone of less than 1 ppmv benzene. This level is one tenth of the current occupational Permissible;Exposure Limit (PEL) Action Levels of Hydrocarbon Comvonents in Petroleums Fuel ' Gasoline >300ppm PEL LEL >10% P Benzene >lppm PEL Oxygen <19.5% Toluene >I 00ppm PEL Xylene >100ppm PEL Ethyl Benzene >I 00ppm PEL A hydrocarbon vapor analyzer will be used to measure real time breathing zone concentration for comparison with the 100 ppmv working[limito When a persistent level of J 100 ppmv is observed, appropriate respirators will be donned and other vapor measurements will be made. If hydrocarbon vapors exceed 1000 ppmv or 10 ppm benzene, work will be stopped. The field crew will be instructed to stay up wind and methods will be applied to subdue fugitive vapor emissions such as sprinkling soil with water, or. the use of a copus blower. The site Safety Officer will make such determinations. - If LEL is >10% in or around the tank, work must stop ana not commence until determined t t safe and/or LEL <10%. r If oxygen levels in the immediate work area are <19.5% ,11work-must stop until determined safe and/or LEL >19.5%. SSrnytorns of Acute Overexposure Gasoline and gasoline;vapors maybe irritating to the skin, eyes and respiratory tract. Gasoline vapors may effect the central nervous system and may cause headaches and �r. . dizziness. E ? A:\HEAL&SAF\TANK.001 29 January 1993 5 Y I