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Site Safety Plan May 1, 1991 ARCO Station No.2130, Stockton, California AGS 30003-1S If the lowest TL.V or PF^T. is consistently bang excecdcd ir, the breathing cone, then a respirator must be worn. If the concentration exceeds 1,000 parts Der million(ppm),the use of a respirator is inappropriate and personnel must withdraw from the site. POSSIBLE EXPLOSIVE ATMOSPHERES Gasoline has a flammable range from approximately 1.4 to 7.6 percent in air.Propane has an explosive range from 2.2 to 9.5 percent in air. One percent in air is equivalent to 10.000 ppm; thus the lower explosive limit (LEL)for gasoline is 14,000 ppm and propane has an LEL of 22,000 ppm. Normally explosive levels may be reached in tanks, pits, or other confined spaces. Any area suspected of containing potentially explosive levels of gasoline or propane 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 higher levels are encountered Greater than 25 then Explosion hazard. percent of LEL . Cease activities and vacate area immediately s CGT readings in percent of hwer 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. 13ECONTAMINA'ITON-PROCEDURES ----------- ------ --�-------- ---- --- ----- 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. 14 APP/10d GeoSystelns