WPC` 5xی{'n&sP W{қ.l0 Fn1| ;zS^Sk10df@(tekG\ϽSKpI+oO25GRA5VWY3ԔT8SNQ{ N7M4\/RdIl=6o3Ys\IAv44WkiEt Mșt04V"HvaFb4:hA۹*8إod6z*d8De,R#0o_LJ=f܏uT77Y0WJDy.brݮ]4X>)k\vnz+@Njz fzp,frHB.":c] 5)~Zr P=%q'00}F=H|!KxTOH1@' 0DkU>N^  m 0LHP DeskJet 500HPDSKJET,X,,,,,X0nL$(9 Z 6Times New Roman RegularX($ 7E8e9:E;U<E=>E?@1%nued..3|x@ ##Xd#(3$ !  <( 9Z &Courier Regular^%U>c$"Small Circle"0 !  _88 =(Stamp=>=date=>?eddate?@onsignedcopy@?January7,1998)?:: XXXX::Mr.JimSell,SeniorCounselNationalPaintandCoatingsAssociation1500RhodeIslandAvenue,_N.W._Washington,D.C.200055597DearMr.Sell:  Thisletteraddressesvolatileorganiccompound(_VOC_)formulationdatabeingusedbymanufacturersasasurrogateforvolatileorganichazardousairpollutants(_VOHAP_)todemonstratecompliancewithemissionlimitationsintheNationalEmissionStandardsforHazardousAirPollutants(_NESHAP_)forShipbuildingandShipRepair(SurfaceCoating)Operations.Youandothersinthemarinecoatingmanufacturingandshipbuildingandrepairindustrieshaveindicatedthatthereisstillconsiderableconfusionoverhow_VOC_Ԁformulationdatashouldbegeneratedandpresentedbythecoatingmanufacturerandusedbytheshipyardorotheraffectedsource.Thesequestionshavedealtbothwithcoatingsthattheshipyardwilluseassupplied;andwithcoatingsthattheshipyardwillthinbeforeusing.Pleasenote,thisletteronlyaddresses_VOC_Ԁformulationdatausedbymanufacturersforcoatingsthatassuppliedcontainnoexemptsolventswhichare_VOHAP_,andarenotthinnedwithanyexemptsolvent.  AsstatedinmylettertoyoudatedJune11,1997,_VOC_formulationdatamaybeusedbymanufacturersinlieuofthecoatinguserorcoatingmanufacturertestingeachbatchofcoatingbyMethod24,whenusing_VOC_Ԁasasurrogatefor_VOHAP_Ԁtodemonstratecompliancewiththeemissionlimitationsinthe_NESHAP_.However,themanufacturers_VOC_ԀformulationdatamusthaveaconsistentandquantitativelyknownrelationshiptoMethod24.Ininstanceswherethereareconflictingresultsbetweenthe_VOC_ԀformulationdataandMethod24results,theMethod24resultstakeprecedence.  Ingeneratingaformulation_VOC_ԀvaluethathasaconsistentandquantitativelyknownrelationshiptoMethod24,acoatingmanufacturermustaccountforthefollowingthreefactors:  8񜛜8   ` 88cure_volatiles_Ԁgeneratedbythecoating;88   ` 88variationsbetweenqualitycontrolapproved88    88production88batchesofthecoating;and88    88variationsbetweenMethod24testresultsofsamples    88taken88fromanyqualitycontrolapprovedproduction    88batch88ofthecoating.   D.*3  75\XXdXXd7  8񜛜8;;  Thecoatingmanufacturermustprovideaformulation_VOC_ԀvaluethatwillnotbeexceededifasamplefromanyqualitycontrolapprovedproductionbatchofthecoatingistestedbyMethod24.ThisinformationcanbepresentedontheformprovidedinAppendixAoftherule,oronasimilarformofthemanufacturerschoosing.  Thefollowingparagraphsdescribethespecificdatathatacoatingmanufacturingmustprovidetosatisfytherulesprovisionsfor_VOC_Ԁformulationdatausedbymanufacturersforcoatingsthatassuppliedcontainnoexemptsolventswhichare_VOHAP_Ԁandarenotthinnedwithanyexemptsolvent:)c  )cJ"0    Forcoatingsthateitherwillnotbethinned,orwillbe T thinnedonlywithwater,thecoatingmanufacturermustprovidetheassuppliedformulation_VOC_Ԁvalueinunitsofgramsof_VOC_perliterofcoatingminuswaterandexemptcompounds,andinunitsofgramsof_VOC_Ԁperliterofsolids.(Sincethesecoatingsarenotthinned,orarethinnedonlywithwater,theirasapplied_VOC_Ԁcontentwillbethesameastheirassupplied_VOC_Ԁcontent.)Formulticomponentcoatingsthecoatingmanufacturermustalsoprovidethecomponentmixratio.Thecoatingusermustadheretothiscomponentmixratio.)cJe݌ ## Ќ  )c  )c"0    Forcoatingsthatwillormaybethinnedwithathinnerthat !  isnotanexemptsolventandisnotwater,thecoatingmanufacturermustprovidetheassuppliedformulation_VOC_valueinunitsofgramsof_VOC_Ԁperliterofcoatingminuswaterandexemptcompounds,andinunitsofgramsof_VOC_Ԁperliterofsolids.Thecoatingmanufacturermustalsoprovidetheassuppliedformulationvolumefractionsolidscontentofthecoatinginunitsofliterofsolidsperliterofcoating.[The_mVOC_terminEquation1oftheruleiscalculatedby )#& multiplyingtheassuppliedformulation_VOC_Ԁvalue(inunitsofgramsof_VOC_Ԁperliterofsolids)bytheassuppliedformulationvolumefractionsolids.]Formulticomponentcoatingsthecoatingmanufacturermustalsoprovidethecomponentmixratio.Thecoatingusermustadheretothiscomponentmixratio.Ifthecoatingmanufacturerspecifies .@), andsuppliesthethinner,thenthecoatingmanufacturermustprovidethethinnerdensity.Inthiscase,thecoatingsuppliermaycalculateandprovidethemaximumallowablethinningratiousingEquation1intherule.Ifthecoatingmanufacturerspecifies,butdoesnotsupplythethinner,thenthecoatingsuppliermayprovidethethinnerdensity,andcalculateandprovidethemaximumallowablethinningratiousingEquation1intherule.Ineithercase,thecoatingusermustensurethatthethinnerusedisthethinnerspecifiedbythecoatingsupplier.<)c݌ ## Ќ  <<<<<88<44<884)c݌ ## Ќ  4884488  Themanufacturersformulation_VOC_Ԁvaluescouldbegeneratedinseveralways.Onemethodofgeneratingthesevalueswhichisacceptable,andwhichyouhavediscussedwithAnthony_Raia_ԀofmystaffandDavidSalmanoftheEPAairofficewouldbeforthecoatingmanufacturertotestsamplesoflaboratoryproductionbatchesandearlyregularproductionbatchesofanewcoatingbyMethod24,andtosettheformulation_VOC_ԀvalueequaltothemaximumMethod24resultplusasafetyfactoraddedtoaccountforthethreefactorslistedonthefirstpageofthisletter.Regardlessofhowtheformulation_VOC_Ԁvaluesaregenerated,Method24takesprecedenceoverthemanufacturers_VOC_Ԁformulationdataincaseofconflictingresults.  Thecoatingmanufacturermaywanttoindicatethatthefactorslistedonthefirstpageofthisletterhavebeenaccountedforingeneratingtheformulation_VOC_Ԁvalueforacoating.Thecoatingmanufactureralsomaywanttoprovideareminderthatintheinstancewherethereareconflictingresultsbetweenthemanufacturers_VOC_ԀformulationdataandMethod24results,Method24takesprecedence.Onewayinwhichthecoatingmanufacturercouldconveythisinformationwhenpresentingformulation_VOC_valueswouldbetostatethat:0  0##Thecoatingmanufacturerhasfollowedsoundandconsistentqualitycontrolproceduresinitsbatchformulationandmanufacturing88processes55.88 ## 0  0##Theformulation_VOC_ԀvaluepresentedhasaconsistentandquantitativelyknownrelationshiptotheMethod24resultthatwouldbeobtainedbytestingasamplefromanyqualitycontrolapprovedproductionbatchofthiscoating. ## 0  0##Thecoatingmanufacturercertifiesthatbasedonthe .@), qualitycontrolproceduresinitsbatchformulationandmanufacturingprocesses,theassuppliedformulation_VOC_valueprovidesanupperboundonthe_VOC_ԀcontentoftheassuppliedcoatingaswouldbedeterminedbyMethod24.Asstatedintheshipbuildingandshiprepair_NESHAP_,incaseofconflictingresultsbetweenmanufacturers_VOC_formulationdataandMethod24results,however,Method24takesprecedence. ## 88778866776688  Toclarifythemannerinwhichthemanufacturersformulationvaluesaregenerated,andtofacilitateidentificationofthesourcesofanyvariationsbetweenthemanufacturers_VOC_formulationvaluesandMethod24testresults,themanufacturermay  @   provideadditionalinformationontheassuppliedcoating(e.g.9,9 0  thecoatingdensity,weightpercent _volatiles_,weightpercent   water,andweightpercentexemptsolvent).Sinceasafetymarginwillbeincludedinthemanufacturers_VOC_Ԁformulationvaluesandsincevariationsinthesethreeparametersdonotnecessarilyincrease_VOC_Ԁcontent,thisadditionalinformationisforinformationalpurposesonly.  Ihopetheinformationinthisletterishelpful.Ifyouhaveanyquestions,pleasecontactAnthony_Raia_Ԁat(202)5646045orDavidSalman(919)5410859.     @    Sincerely,     @    JohnB._Rasnic_,Director  Manufacturing,EnergyandTransportationDivisionOfficeofCompliance+cc:RegionalAirDirectors̀LindaHerring,_OAQPS_̀Anthony_Raia_,_OECA_̀DavidSalman,_OAQPS_̀Mohamed_Serageldin_,_OAQPS_#XF3XX Xƾq#