b'Withaminoreffort,the roofingindustry can readily shift 80% oftheworkersintotheacceptablerangebasedonobservations made duringthetimeofsampling. Thelargestnumberofworkersindicatinganexposureto benzeneextractablesinexcessoftheexisting0 . 2rng/M3limit wereworkingwithexcessivelyhotmaterial.Theremedial actionisto workwithinthetemperaturerangesprescribedby EVT. Undersized andbroken equipment also accounted for alarge numberof warexposuresin excess of the 0. 2mg/M3limit.The ker remedialactionisselfevident. Poorworkerhabits andtrainingalso accountedforexcessiveworkerexposure.Forexample,whereachoicewasavailable,manyworkerswouldstanddownwindfromequipmentreleasingemissionswhereastheycouldhaveworkedupwind.Anotherexample,thoughveryunique,accountedforthreeofthe samplesintheexcessivelyhighrange;oneworkerinsistedon sprayingallsolidmaterialbeforeintroducingitintothe kettle withthe claimthat he hadburnedhishandsearly in his careerliftingahotsolidplug.Watersprayingresultsin steamdistillationoforganicsfromthekettlewhichgreatly enhancesexposureconcentrations.(Sprayingofsoft plugsis poorfrom emission concerns,but commonpractice onhot daysto assistinchoppingplugs . )Theremedialactiontoeliminate th poor habits and augment training is to include safet yandheal concernsintheapprenticeschoolclasses.Howtoinform foremenand managementofthesecontemporaryconcernsis more difficult. Howtoreducethe20percentintheexcessivelyhighrangeto acceptablelevelsisverydifficultfo~tworeasons: Ventilationonthejobsiteisuncontrollable.For example,afeltlayerandbroommanworkingwithapieceof equipmentthatemitsemissionsarefor~edto walkdirectlyin theseemissionsifthewindisinthedirectionofthework pattern andthe wind velocity is relatively small.Theremedial actionistotrytoestablishaworkpatternnotinlinewith thewind. Secondly,ashavebeenpointedout,severaltasksinherentlyarerelatedtohighexposurelevels. Whatistheultimateremedialactionthatcanbetaken?This aspect requiresfurtherstudybytheindustry.Thefinalactionis alreadyunderstudybytheindustryinCanada:Afiltermask availableto workerswhensubjecttosituationsknowntoresultin potentialexcessiveexposurestohotemissions." QUALITYANDFIELDINSPECTION Inspection is one of the weakerlinksin the roof construction chain. \'-\'Manyownersareunawareoftheneedforrigorousfieldinspection,and somearereluctanttopaythepriceforsuchapparentlynonproductive work.Goodinspectionis,however,anessentialformofconstruction'