b'20Pleaselet themknow yourfeelings onthis,not onlyfromthe 330. roofer\'s endofit,butalso fromthetaxpayer\'ssideastheroofing workforSACisattheveryleast,doublethecostofprivate enterprise." EMISSIONSEXPOSURESTUDIED In 1979,theNationalRoofingContractors Associationtogetherwith theRoofingContractors Association ofSouthern California embarkedupon astudy oftheexposureofroofing workersto hot asphalt andhot coal tar pitch emissions.Theresults of the study program,to which MRCAand other associations madefinancialcontributions,werereportedintheFebruary, 1982,issueofTheRoofingSpec. Thepurposeofthestudywastocompareactualexposureofroofers inthefieldto OSHAandCal/OSHAexposurelimitationregulations.The currentOSHA1isfoundinSection1910oftheOSHA imitation.1000 regulations.Thisstandardlimitsemployeeexposuretocoaltarpitch volatilestoaneight-hourtimeweightedaverageof0. 2mg/M3or. 2 milligrams of coaltar pitch volatiles particulate per cubic meter of air. Section1910.1000alsoestablishesaneight-hourtimeweightedaverage limitation of 5milligrams of inert or nuisance dust particulate per cubic meterofair. TheNRCA/RCASCstudyutilizedairsamplersonworkmenat16worksites.Thesampling device consisted of asmall pump mountedonthe waist oftheworker .A suction hoselead fromthe pumpto asmall plastic filter holderclipped to theshirt collar oftheworker,thereby positioningthe samplefilterinthebreathingzoneoftheworker.Samplerpumpswere placedonworkersperformingavariety offunctions,rangingfromthose insuspectedhighexposurejobstoworkersinvolvedingravelingoperations. Atotalof211samplesweretaken.98%ofthehot emissionsamples, bothpitch andasphalt,passedtheparticulatestandardof5milligrams percubicmeterofair.Withrespecttothe0.2mg/M3limitation,the study rankedthefollowingjobs with respectto emissions exposure,worst first:felt machine operators;kettlemen;mop and broom;hot luggers;set andspread.Withrespecttokettlemen,thestudyfoundthat26%ofall kettlemensampleddidnotexceedtheexposurelevelwhereas74%ofthe kettlemenwerebeingexposedbeyondacceptablelimits. Thestudyattemptedtodeterminewhetherpitch orasphalt offered a greaterpotentialhazard.Baseduponthe0.2mg/M3exposurelimit,pitch provedto beless hazardous with 49%of total pitch samplesfalling within theexposurelimitationwhereasonly37%ofasphaltsampleswerewithin theacceptablerange.Further,thestudy determinedthat the majority of sampleswereclosetobeingwithintheacceptablerange,withonly approximately20%oftotalS\'amplesforbothpitchandasphaltinthe excessivelyhijhrangewhich,forpurposesof thestudy,wasarbitrarily setatl.0mg/Morgreater. Theconclusionsportionofthestudywrite-upstatesasfollows: "\'rheactualhazardfromemissionshasneverbeendemonstrated intheroofingindustrybuthasonlybeeninferredbyatenuous relationshiptoanotherindustry,thechemicalprocessindustry-coalcoking.'