Document XRwy8ybYZx39MwYB6x4J9xeOR

3M SpecialtyMaterials 3M Center St.Paul,MN 55144-1000 651733 1100 June 8,2000 Dr.CharlesAuer Director Chemical ControlDivision OfficeofPollutionPreventionand Toxics United StatesEnvironmentalProtectioAngency 401 M Street,Southwest Room 403 EastTower (MailCode 7405) Washington,D.C. 20460 Re: InformationofPerfluorooctanoAicid & Salts- UEIP Form Dear Charlie: 3M isenclosingthecompleted"Use and ExposureInformationProfileo"r"UEIP" for perfluorooctanoiaccidand salts. With respecttoindustriahlygieneinformationy,ou shouldbe aware thateach 3M plantthat producesperfluorooctanoiaccidand salthsas an industriahlygieniston staffand issupportedby a corporateindustriahlygienegroup. 3M's industriahlygieneprogram focuseson task-based exposure assessmentand control.Exposuresareidentifieadnd assessedqualitativelaynd/or quantitativelyQ.ualitativaessessmentsareperformedby an industriahlygienist.Quantitative assessmentsincludetask-basedpersonalsamplingforcertains,pecificfluorochemicalsand/or sourceor areasampling. The resultosf theassessmentssupportdecisionson exposurecontrol. Engineeringcontrolsarepreferredb,utpersonalprotectivequipment may be used on an interim basisor when effectiveengineeringcontrolisnot feasible. In certainsituations3,M has gatheredpersonalindustriahlygieneand area/sourcmeonitoringdata fora specificompound and has includedthepersonalindustriahlygienedataintheprofileT.he area/sourcesample resultsand/orsurfacewipe sample resultsareused totargetareaswith employee exposurepotentiaalspartof exposureassessmentunder 3M's industriahlygiene program and arenot measurements of actualemployee exposures.Hence, theyarenot included withthissubmission.In othersituationnse,itherpersonalsampling datanor area/sourcedatahave been collectedfora specifichemical. The swnple resultosfany airmonitoringarecompared totheACGIH TLV-TWA of 0.01mg/m3 [skin]fortheammonium saltand to3M's voluntaryexposureguideline(EG) of0.1mg/m3 (milligramsof fluorochemicapler cubicmeterof,air)fortheacidand sodium saltT.he EG isan 8hour time-weightedaverage(TWA) personalbreathingzone exposurechosentominimize potentiafloruptake. Page 2 Dr. CharlesAuer Similartothe industriahlygieneprogram,each 3M facilittyhatproducesfluorochemicalshas one or more environmentalengineerson-siteand isalsosupportedby a corporateand divisionlevel environmentalorganizationT.he envirorunentaelngineersassistheprocessengineerswith calculationasnd emissionestimates.The corporateenvirorunentaolrganizatiodnevelopsmethods foranalyzingemissions.In additiontotheseresourcess,everalteams were establisheidn recent yearsto identifyc,haracterizaend reducespecificfluorochemicalemissionsfrom the manufacturingsites. While analyticamlethods have improved overtime,largevariabilisttyilelxistsforcertain matricesand compounds, so dataavailablfeorthisreportismostly of a qualitativneature. Although limitedmonitoringdataexistsm,ost emissionand waste estimatesarebased upon processmodels and engineeringcalculationEsn.gineeringcalculationhso,wever, have limitations withrespectto fluorochemicalbsecausefluorochemicalosseswere not always includedinthe analysisof each intermediatestep. The accuracyof theemissionsdatasubmittedvariesdue to severalfactors.Batch processsystem emissionsaredifficultto measure due toquicklychangingprocessconditionsv,entingpressures and difficultiynisolatinpgrocessestotakemeasurements. Additionallyt,heunique characteristiocfsthesecompounds causethem tobehave differentlfyrom conventional compounds, and physicalchemicaldatapropertieasrenot availableforallintermediatreeaction steps. Pleasedo not hesitatteo contactme at651-733-6374 should'youhave any questions. Very trulyyours, -44&4a;,@ L?. WilliamA. Weppner, Ph.D. Director Environmental,Health,Safetyand RegulatoryAffairs 3M SpecialtyMaterialMarkets Group 3M Center,Building236-lB-10 St.Paul,MN 55144-1000 651n33-6374 65in33-1958(fax) waweRpnerPa.mmm.com Attachments