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June 21, 1991 <br /> ARCO Station No. 548 <br /> p-V <br /> structures. Applied GeoSystems assumes no responsibility for utilities not so located. The <br /> first 5 feet will be hand augered before any drilling equipment is operated. <br /> Each of the areas where the borings will be drilled will be designated as Exclusion Zones. <br /> e, When it is practical and <br /> Only essential personnel will be allowed into an Exclusion Zon <br /> local topography allows, approximately 25 to 75 feet of space surrounding those Exclusion <br /> Zones will be designated as Contamination Reduction Zones. <br /> Cones, wooden barricades, or a suitable alternative will be used to deny public access to <br /> these Contamination Reduction Zones. The general public will not be allowed close to the <br /> work area under any conditions. If for any reason the safety of a member of the public <br /> (e.g., motorist or pedestrian) may be endangered, work will cease until the situation is <br /> remedied. Cones and warning signs will be used when necessary to redirect motorists or <br /> 11� pedestrians. <br /> F..pOSUR F MONITORING PLAN <br /> It is not anticipated that project personnel exposure will exceed the TLVs or PELs of the <br /> materials;howwer,proper personale protective equipment will be worn while working at the <br /> site. In addition, the work area will monitored using adirect-reading combustible gas <br /> analyzer or an organic vapor meter to detect the concentration of the volatile hydrocarbons <br /> in the ambient atmosphere. <br /> en a <br /> If the lowest TLV or PEL is consistently being exceeded in the breathing zone,tie use <br /> respirator must be worn. If the concentration exceeds 1,000 parts per million(pp ). E <br /> of a respirator is inappropriate and personnel :oust withdraw from the site. <br /> E <br /> POSSIBLE EXPLOSIVE ATMOSPHERES <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 /> e reached in tanks.pits,or other confined spaces. Any area <br /> Normally explosive levels may <br /> suspected of containing potentially explosive levels of gasoline will be e evaluate <br /> luae d espouse <br /> intrinsically safe or explosion-Pro <br /> an <br /> of combustible gas indicator (CGI). <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 /> AGS 30404-43 13 <br /> len <br />