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Possible Explosive Atmospheres Gasoline has a flammable range from approximately 14 to 7 6 percent in air One percent in air is equivalent to 10,000 ppm, thus the lower explosive limit (LEL) is 14,000 ppm Normally explosive levels may be reached in tanks, pits, or other confined spaces Any area suspected of containing potentially explosive levels of gasoline will be evaluated with an intrinsically safe or explosion-proof combustible gas indicator (CGI) Personnel response will be based on the following action levels from CGI readings -- Less than 10 then Continue activities and percent of LEL* monitoring -- 10 to 25 percent of LEL then Continue monitoring with extreme caution as higher levels are encountered -- Greater than 25 percent of LEL then Explosion hazard Cease activities and vacate area immediately *CGI readings in percent of lower explosive limit If an explosion potential is present on site beyond 25 percent of the LEL then all EMCON's' personnel and subcontractors must immediately withdraw from the site The hazard potential will be evaluated by EMCON's' management and a plan of action will be assessed Decontamination Procedures Drilling equipment and personal protective equipment will undergo gross decontamination on site This gross decontamination will include washing contaminated equipment with a trisodium phosphate(TSP) solution Steam-cleaning is an acceptable alternative Emergency Response Procedures In the event of a fire, explosion, or property damage, the nearest EMCON Branch and the Administrative Office will be immediately notified If necessary, local fire or response agencies will be called In the event of an accident resulting in physical injury, first aid will be administered and the inured worker will be transported to the nearest hospital or emergency medical clinic for SAMNTJQ\08o5108o5ta7o tate-94+drm t B-12