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MRM!�� .. <br /> arm v - 33..' '". `Y <br /> L <br /> M. a .'y <br /> '1 <br /> o upon j,a:.t-xL entry anto roe site. <br /> 7 igen weatner Canditicns change. <br /> a When worst tagLns on anotrer ?arMIon a: .he site. - <br /> ID o 7-very five feet during <br /> Because of :.'Le yrtnding :evolved wLth drilling and spU t-spoon <br /> sampling mere is a potential for sparks to be generated. Air mon.Ltnr- <br /> Lnq for combuatible gases/vapors will be conducted. a combuszihle gas <br /> indicator is the instr=ent of choice i.n determining the concentration <br /> of ElammablP vapor =n the air. auideliaes have been established by r_he <br />' 'tatt,onal Institute for Occupational Safety and Health (NIOSH} concerning <br /> • _`1e action Laveis to be utilized when working La a potenr-tally exnlassve <br /> invlrcnaent. <br /> `iIOSB guidelines an the use of the comnusrzhle gas L dicator: <br /> 1. 10 percent LEL - Limit all activities in area to that: that do <br /> not generate spares. <br /> 2. 20 percent LEI. - Limit all activities in area. <br /> When readings exceed 20 percent LEL-on the indicator all activities <br /> mist cease to allow time for rhe combustible gases to vent. <br /> 3.4.1 0lsnlaceMOn t of Comlaus tzh Le Cases <br /> It the explosive/combustible concentrazxons of gases in fire Well/ <br /> bore-hole are not diminished after allowing adequate time t-0 vent- thea <br /> the following steps should be taken. <br /> `mF 1. obtain an air compressor (minimum 1.5 horsepower)- The hose on <br /> the pressure side of the compressor should have a length <br /> equivalent to the depth of the well/bore-hole. <br /> 5.' <br /> ` 2. ?lace hose into the wall/bore-hole unt:.1 it reaches botzz=- <br /> 3. Start air ccmoressor and "=sn" _= for 15 MLnuzes. (T!se air <br /> co=resscr should be placed a safe distance fro= ire weil/bare- ;` <br /> hole). <br /> r <br /> ,.i <br />