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• T f #v' <br /> 1 <br /> Site Safety Plan-October 14, 1992 <br /> BP Oil Facility No.11191, Stockton, CA Working To Restore Nature <br /> Each of the areas where the borings will be drilled will be designated as Exclusion Zones. Only <br /> essential personnel will be allowed into an Exclusion Zone. When it is practical and local <br /> topography allows, approximately 25 to 75 feet of space surrounding those Exclusion Zones will <br /> be designated as Contamination Reduction Zones. <br /> Cones, wooden barricades, or a suitable alternative will be used to deny public access to these <br /> Contamination Reduction Zones. The general public will not be allowed close to the work area <br /> under any conditions. If for any reason the safety of a member of the public (e.g., motorist or <br /> pedestrian) may be endangered, work will cease until the situation is remedied. Cones and <br /> warning signs will be used when necessary to redirect motorists or pedestrians. <br /> EXPOSURE MONITORING PLAN <br /> It is not anticipated that project personnel exposure will exceed the TLVs or PELs of the materials; <br /> however, proper personal protective equipment will be worn while working at the site. In <br /> addition, the work area will monitored using a direct-reading combustible gas analyzer or an <br /> organic vapor meter to detect the concentration of the volatile hydrocarbons in the ambient <br /> atmosphere. <br /> If the lowest TLV or PEL is consistently being exceeded in the breathing zone, then a respirator <br /> must be worn. If the concentration exceeds 1,000 parts per million (ppm), the use of a respirator <br /> is inappropriate and personnel must withdraw from the site. <br /> POSSIBLE EXPLOSIVE ATMOSPHERES <br /> Gasoline has a flammable range from approximately 1.4 to 7.6 percent in air. One percent in air is <br /> equivalent to 10,000 ppm; thus the lower explosive limit (LEL) is 14,000 ppm. Normally <br /> explosive levels may be reached in tanks, pits, or other confined spaces. Any area suspected of <br /> containing potentially explosive levels of gasoline will be evaluated with an intrinsically safe or <br /> explosion-proof combustible gas indicator (CGI). Personnel response will be based on the <br /> 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 /> 17050.01 S S P 12 <br />