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20 ' 90 14x41 1111 APPLIED 0F:0SYSTE 916-4 2- 0534 F -- <br /> FSiteSafetylan August 20, 1990 <br /> n Station No. 7-1050, Stockton, California AGS 30045-IS <br /> POSSIBLE EXPI,t SWr &TM0crr4eRXr <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 <br /> area suspected of containing potentially explosive levels of gasoline will be evaluated with <br /> an intrinsically safe or explosion-proof combustible gas indicator (CGI). Personnel <br /> response 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 Applied <br /> GeoSystems' personnel and subcontractors must immediately withdraw from the site. The <br /> hazard potential will be evaluated by Applied GeoSystems' management and a plan of <br /> action will be assessed. <br /> DECONTAMINATION 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 is an acceptable alternative. <br /> EMERGENCY RESPONSE PROCEDURES <br /> In the event of a fire, explosion, or property damage, the nearest Applied GeoSvstems <br /> Branch and the Administrative Office will be immediately notified. If necessary, local fire <br /> or response agencies will be called. <br /> 13 <br /> App//ed GeoSystems <br />