WPC 1>Nؑ&prY@#צ2!*7'ig<8lAKѐSrqG ABA!sIw`)BWoUj<81`aɺ'SAr/.TLw6YבşehA9$4MQj v&b˄T2Fyݷ(x<M;|$k_хس jSdSph@׷Qev|D8yHրrYK{}iVL)΅>A 0n2P0p& Ji,IyW(vW5YB*>w9;R3xA(KY ݄hn.B.L.tGW}hU<%C@OvhC3pnr/x%>-4c78ab\a~44WQvRЁmF{Nt`;=p$# UAH %K 0(Qw@y-_ N-   !) ! ! !  fi " ) 4 BHP LaserJet 4/4MHPPCL5E,,,,0 <09Z 0Courier (W1) RegularX($ ,D-D./D0 U12D3D4D5DSRMsNTRMsNIST77BAMRDSO2&intercomparison&GMISsSRMNTRM1693aR1693aCFRCEMSHinesRossHighsmith78AVickerySilvasiSchakenbach6204J ##Xd#H8 '  , DOLLAR ##Xd#UBLh3|s5"BJQ\s??=4 /N߃R`<@0||q?LjM @"BJQ\s??=4 /N߃R`<@0||q?LjM @"BJQ\s??=4 /N߃R`<@0||q?LjM @"BJQ\s??=4 /N߃R`<@0||q?LjM @<6X9`+Courier< 9+CourierBold?xxx,,Xx{q)n2```,,`(C:::,,":1?xxx,,/Xx +m  d !  ݛH ќ33@&July24,1996MEMORANDUM P  SUBJECT: ` GuidanceforSRMsand%  ԀNTRMsCertified 0     ` byNISTbetween1989and1996FROM: ` AndrewE.Bond,ActingChief P     ` QualityAssuranceBranch(MD77B)   ` AMRD/NationalExposureResearchLaboratory   ` ResearchTrianglePark,NC27711TO:   ` SuppliersofProtocolGases    TheNationalInstituteofStandardsandTechnology(NIST)hasinformedusthattheyareadjustingtheSO2concentrationsin p theStandardReferenceMaterials(SRMs)andtheNISTTraceableReferenceMaterials(NTRMs)thatwerecertifiedbetween1989andMay31,1996.Theadjustmentsarerequiredastheresultofanintercomparisonbetweenthetraditionaltitrationmethodandagravimetricallypreparedstandard.  WeareawarethatsomeoftheseSRMsandNTRMshavebeenusedinthepastormaybeusedinthefuturetocertifyProtocolGaseseitherdirectlyorthroughtheuseofGasManufacturersIntermediateStandards(GMISs)traceabletotheseSRMsandNTRMs.ϜNolaterthanSeptember1,1996allnewProtocolGasesproducedϜorsoldarerequiredtobebasedupontheadjustedSRM/NTRMvalue.ThisincludesgasesproducedusingGMISs.Inaddition,ProtocolGasesproducedusingadjustedSRM/NTRMsshouldbetaggedwithacode RbeforetheSRMnumbertoindicatethattheadjustmenthasalreadybeenmade(i.e. SRM1693awouldbechangedto SRMR1693aontheProtocolGascertificate/cylinderlabels).  SomeoftheProtocolGasespresentlyinuseorpreviouslyϜusedinconformanceto40CFRParts58,60,61and75mayalsorequireanSO2concentration adjustment.Thisincludesgases0 ,`'* 05005400430 7|?XXdXXd7  03usedforstackCEMSandreferencemethodtesting.Itis4 7|?XXdXXd7  40 7,NXXdXXd7  0acceptabletoreissuecertificatesandcylinderlabelswiththe5 7|?XXdXXd7  50 7,NXXdXXd7  0correctedgasvalues.Ifthisapproachisfollowed,thenew .0*-  7XXdXXd7  certificateandcylinderlabelsshouldbetaggedwithacodeRin h theSRMnumbertoindicatethattheadjustmenthasbeenmade.  WeareawarethatissuingnewcertificatesandlabelsforaffectedProtocolGasescouldbecostlyandtimeconsuming.Therefore,itisalsoacceptabletoEPAiftheownersofProtocolGaseshandcorrecttheircertificates, ,andcylinderlabels, ,.Ifthisapproachisfollowed,ownersofProtocolGasesshouldattachdocumentationtothecertificateindicatingtheunadjustedconcentration,theadjustmentfactor,andthenewadjustedconcentration(thismayincludealetterfromthesupplieroftheProtocolGasindicatingthe adjustmentfactortheyshoulduse).ϜAsamplestandardform- -..andablankform- -formakingthesehandcorrections/ /are/ /0 0attached.TheEPAregulatoryunitsconcernedwith40CFRParts58,60,61and75haveconcurredwiththisϜapproach.  ProtocolGasusersmustimplementtheadjustmentnolaterthanJanuary1,1997.EachEPAregulatoryunitmayissueadditionalguidanceabouthowthisadjustmentwillaffecttheirprogram.  WewouldappreciateitifyouwouldnotifyyourProtocolGasesusersoftherequired adjustmenttotheirSO2  concentration.Pleasefeelfreetoincludeacopyofthisletterwithyourcorrespondence.  IfyouhavequestionspleasefeelfreetocontactMs.AvisHinesofmystaffat9195414001orbyFAX9195417953.Attachment1s1̜cc:  2 8' # Л ` 2AvisHines,MD77B h$    BillMitchell,MD77B  RossHighsmith,MD78A  JimVickery,MD75  JohnSilvasi,MD14  JohnT.Schakenbach,6204J  27,}XXdXXd7  247|?XXdXXd7  437|?XXdXXd7  307,NXXdXXd7  0/7;XXdXXd7  /-7;XXdXXd7  7;XXdXXd7  -,7;XXdXXd7  ,   @  @` SAMPLESTANDARDFORM ,p&) 57|?XXdXXd7  5 .P(* 7|?XXdXXd7  AXX @@,,$EPACylinderGas  SO2ConcentrationAdjustment #X|?XA#    GasCylinderData:    ',XXXX'GasSupplier:    h   GasVendor  l  CylinderNo.:    h   XXX123 \  CertificationDate:   h   7/25/96 x   L  ExpirationDate:   h   7/25/99 <  0,XXX,XXX0TypeofCylinder:  P ,|  &Y &XX|?(P=protocol,G=GMIS,N=NTRM,S=SRM)#X|?X &&Y# l  OriginalSO2concentration,C(SO2) | XX|?ori#X|?X  |.#Ԁ:  90.81ppm F CorrectedSO2concentration,&Y &XX|?C(SO2)#X|?X J&Y# | hX|?cor#X|?X  |#:  92.70ppm x  6   &Y &XX|?C(SO2)#X|?X J&Y# | hX|?cor#X|?X  |#&Y &hX|?=C(SO2)#X|?X &&Y:# | XX|?ori#X|?X  |#&Y &hX|?*#X|?X &&Y#F | XX|?cor#X|?X  |# & 6,X X,XXX6 GasStandard*Data:   6,XX,X X6StandardNo.:  SRM0000 v CorrectedStandardNo.:  SRMR0000 f CylinderNo:  xxx456 V Expirationdate:  7/20/97 F Originalconcentrationofthestandard,S | XX|?org#X|?X  |5#:259.8ppm 6 Correctconcentrationofthestandard,S | XX|?cor#X|?X  |#:  265.2ppm x  &v (fromNISTtable)Correctionfactor,F | XX|?cor#X|?X  |q #Ԁ=0 4 XX,N#X;X  F:#0S | XX|?cor#X|?X  | !#Ԁ/S | XX|?org#X|?X  |Z!#:  1.021 !V Signature:________________________Date:_____________*SRMsorNTRMs  '"$ 7|?XXdXXd7AXX|? @$EPACylinderGas    SO2ConcentrationAdjustment      GasCylinderData:   X 0,XXX,XX0GasSupplier:   h      x  4  CylinderNo.:   h      J  CertificationDate: h      x  `  ExpirationDate:   h    v  0,XXX,XXX0TypeofCylinder:     #X|?XAm"#&Y &XX|?(P=protocol,G=GMIS,N=NTRM,S=SRM)#X|?X &&YO%#   OriginalSO2concentration,C(SO2) | XX|?ori#X|?X  |%#Ԁ:   |  CorrectedSO2concentration,&Y &XX|?C(SO2)#X|?X J&Y&# | hX|?cor#X|?X  |&#:   l    &Y &XX|?C(SO2)#X|?X J&YO'# | hX|?cor#X|?X  |'#&Y &hX|?=C(SO2)#X|?X &&Y'# | XX|?ori#X|?X  |9(#&Y &hX|?*#X|?X &&Y(#F | XX|?cor#X|?X  |(# \ 6,X X,XXX6 GasStandard*Data: l  6,XX,X X6StandardNo.:   L CorrectedStandardNo.:   < CylinderNo:   , Expirationdate:    Originalconcentrationofthestandard,S | XX|?org#X|?X  |*#:   Correctconcentrationofthestandard,S | XX|?cor#X|?X  |I+#:      (fromNISTtable)Correctionfactor,F | XX|?cor#X|?X  |+#Ԁ=3 | XX|?#X,NX  4,#3S | XX|?cor#X|?X  |,#Ԁ/S | XX|?org#X|?X  |,#3 | hX|?33#X,NX  4-#3:    Signature:________________________Date:_____________*SRMsorNTRMs