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MA <br /> September 15, 1993 Working To Restore Mature <br /> Ruiz Grocery, 4491 W Durham Ferry Road, 'Tracy, California <br /> POSSIBLE EXPLOSIVE ATMOSPHERES <br /> Gasoline has a flammable range from approximately 14 to 7 b 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, pats, 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 /> - Greater than 25 then Explosion hazard <br /> percent of LEL Cease activities and <br /> vacate area immediately <br /> CGI readings in percent of lower explosive limit <br /> If an explosion potential is present onsite beyond 25 percent of the LEL then all RESNA <br /> Industries' personnel and subcontractors must immediately withdraw from the site. The <br /> hazard potential will be evaluated by RESNA Industries' management and a plan of action <br /> will be assessed <br /> IDECONTAMINAT30N PROCEDURES <br /> Drilling equipment and personal protective equipment will undergo gross decontamination <br /> onsite This gross decontamination will include washing contaminated equipment with a <br /> trisodium phosphate (TSP) solution. Steam-cleaning 1s an acceptable alternative <br />• 123015-1 14 <br />