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n <br /> Site Safety Plan S N <br /> ARCO Station No. 6140, Tracy, California <br /> POSSIBLE EXPLOSIVE ATMOSPHERES <br /> Gasoline has a flammable range from approximately 1.4 to 7.6 percent in air. One percent <br /> lower explosi <br /> in air is equivalent to 10,000 ppm; thus the ve; limit (LEL) is 14,000 pprn. <br /> Normally explosive levels may be reached in tanks,pits, or ether 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 /> Cease activities and <br /> percent of LEL <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 ApplThe <br /> ied <br /> GeoSystems'personnel and subcontractors must Ge,rediately withdraw ms' management from <br /> t d site. of <br /> hazard potential will be evaluated by App <br /> lied action will be assessed. <br /> DECONTAMINATION PROCEDURES <br /> rgo gross <br /> nation <br /> onsitc. equipment and personal protective equipment will decontamination will include washing contaminated equipmentwitha <br /> nnsito. This gross <br /> trisodium phosphate (TSP) solution. Steam-cleaning is an acceptable alternative. <br /> 16 <br /> 30741-zs <br />