WPC 'z`“7D9zlNRWmzgEcG])r8_x*+qtC3%K Ęded +nDmGX4pi Q 8nTs|Ҿb $6kSNj+?j F8#S\u7mzMa.3\pG a!i 4!B$n)vLtnmF5"H1bVp"qB&cQBLv.,#9NTy٭ug#&qb.u}٩5탱"C!@:r] 5mw7|os㩥ves/'sI&u/C ~Igmg=3yë [c NG `M)gf02nAS6[A9GD$t [ syh͒TVU:z % 0OE 0O B  D3- ` 0O& 0Ju AM  m % n5 04 N ^   w$ 4( #< UN UNK<6X9`("Courier 10cpiX  hP)   _X?' xdE!?  Preparedby Robin_Segall_ ,_EMC_     D     _EMC_Ԁ_TID_Ԅ018   _EMAD_,_OAQPS_,EPA  <   0  0D%%0D%D%0%%June11,2001%% ?' xdEr!?('2hP$ U!     hP'   _X?' xdE!?   _EMC_Ԁ_TID_Ԅ018  _EMC_ԀTECHNICALINFORMATIONDOCUMENT L PAGE  1    ?' xdE!? ('2hP$ U!    d'dxd Level 1 Level 2 Level 3 Level 4 Level 5('2hP$ U!   ("$ Figure     A<< cU3|x<6X9`("Courier 10cpiXx6X@;X@( U$   O+ fm5+<HP Color LaserJet 4500 PCL 6,,,,,,0(hH  Z 6Times New Roman Regular(uH Z6Times New Roman Regular U!   _,X  __  ?' $xdE$!?  @.. EMISSIONMEASUREMENTCENTER # @> > TECHNICALINFORMATIONDOCUMENT   ?' ,$xdE$!?   @RRCLARIFICATIONOFMETHOD9CERTIFICATIONREQUIREMENTS     (CopyofLetterSent6/11/01) >  `XaXXXMr.ThomasH.Rose  "  EasternTechnicalAssociates    P.O.Box58495    Raleigh,NC27658   DearMr.Rose: n     4    <   IamwritinginresponsetoyourletterofNovember10,1999,requestinganinterpretationofsection F  3.2ofMethod9VisualDeterminationoftheOpacityofEmissionsfromStationarySources(40_CFR_Ԁ60, 2 AppendixA).Inparticular,youhaveaskedwhetherthelanguageofsection3.2intendedthat(1)the n showingofsmokeplumesofknownopacity(calibrationplumes)mustprecedetheentirecertificationtest(25  Z whiteplumesand25blackplumes)or(2)calibrationplumesmaybeshownbothpriortoandinthemiddleof F (betweenthesetsof25whiteplumesandthe25blackplumes)acertificationtest. 2   AsnotedinMethod9,section3.2,theshowingofcalibrationplumesisdiscretionaryf  g Ԁandno   requirementsorrestrictionsareestablishedconcerningtheuseorsequencingofcalibrationplumesf  g .f  g f  g Thus,wf  g e  believethelanguageofsection3.2allowsforshowingcalibrationplumeseitherpriortotheentire  certificationtest(25whiteplumesand25blackplumes)orinthemiddleofthetest(betweenthesetsof25 ~ whiteplumesandthe25blackplumes).Untilsuchtimef  g f  g asf  g Ԁwehavedatatof  g f  g informabindingregulatory j decisionf  g Ԁfavoringoneoptionovertheother,webelievethechoiceofshowingcalibrationplumespriortothe V entirecertificationtestand/orinthemiddleof(betweenthesetsof25whiteplumesandthe25blackplumes) B isalsodiscretionary.f  g ԀWeareawarethatguidancedocumentsissuedin1975andin1984envisionor .~ recommendthefirstapproachdescribedabovefortheshowingofcalibrationplumes.However,as  j  guidance,neitherdocumentcanimposelegallybindingrequirementswithoutundergoingnoticeandcomment !V! _rulemaking_ԀproceduresmandatedbytheAdministrativeProcedureAct.f  f  g g  !B"   Pleasecontactmeat(919)5414676orRobin_Segall_Ԁat(919)5410893,ifyouhaveanyquestions #$ regardingthisletter. $ % @&Sincerely, &!'   /signed/ f(#) ]@LLJ.David_Mobley_,ActingDirector ,f'- @ Emissions,MonitoringandAnalysisDivision -R(.  .**0 cc:  #XKXXXa#XaXXXKDeputyDirector,OfficeofEcosystemProtection,RegionI v   Director,DivisionofEnvironmentalPlanningandProtection,RegionII b   Director,AirProtectionDivision,RegionIII N   Director,Air,Pesticides,and_Toxics_ԀManagementDivision,RegionIV :    ActingDirector,AirandRadiationDivision,RegionV &    Director,MultimediaPlanningandPermittingDivision,RegionVI     Director,Air,_RCRA_,and_Toxics_ԀDivision,RegionVII     Director,Air&RadiationProgram,RegionVIII  t   Director,AirDivision,RegionIX  `   Director,OfficeofAir,RegionX#XKXXXa#XaXXXK L    Rich_Biondi_,EPA/_OECA_ $    Bruce_Buckheit_,EPA/_OECA_     Donna_Duer_,_DOJ_ r    Gregory_Foote_,_OGC_ ^    Charlie_Garlow_,EPA/_OECA_ J  0  _Gretchen_ԀGraves,_OGC_6%%   Mario_Jorquera_,EPA/_OECA_ "   _Zofia_Ԁ_Kosim_,EPA/_OECA_    ThomasLogan,EPA/_OAQPS_    Robin_Segall_,EPA/_OAQPS_ p   #XKXXXau#