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O - Site Safety Plan March 23, 1990 Arco Station No. 2076, Lodi, California AGS 30008.15 POSSIBLE EXPLOSIVE ATMOSPHERES Gasoline has a flammable range from approximately 1.4 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 then Continue monitoring of LEL with extreme caution as n. ® higher levels are encountered - Greater than 2S then Explosion hazard. percent of LEL Cease activities and vacate area immediately CGI readings in percent of lower explosive limit If an explosion potential is present onsite beyond 25 percent of the LEL then all Applied GeoSystems'personnel and subcontractors must immediately withdraw from the site. The ® hazard potential will be evaluated by Applied GeoSystems' management and a plan of action will be assessed. DECONTAMINATION PROCEDURES 4 Drilling equipment and personal protective equipment will undergo gross decontamination onsite. 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 Applied GeoSystems Branch and the Administrative Office will be immediately notified. If necessary,local fire %4 or response agencies will be called. . 13 �iolpl!�d Pie®.�f/st@e��