ÿWPCÅ ûÿ®gsáý4Y &÷„b»Y49¨ÌE–”ïR´Ë)ïÁ‹0PõRÒ˜QÔó]ö<Ï’[šß” u!ßH½‡ievÇ „,Ëpc¸éªó?ì$Ò£R2ûB¬…7qW€=å¾íCsGìáI Nö"4óô‘uS\Iº¿5ÎÀ½Jÿ¬g*€ž EìÖ]š‡7îY«må / ül³b9Ìš{³tæUT#jäžg×8®~8€Ðï^Pªúš¬½V˜VžI$O&q¦Î»€Šðª ¶gðNÜ–ÇmCá{’yØ«" Ð]eÉô[//gÑv%u8Gñ…øÉû²õݯ1˪@–M‚ßäìF„òb(}tjü¢,SœùÔÍ[ùõZ4ö8ù÷¡=¬¥ÖN™ô§î>g1@.U…Ú1¶ëÉJŒµ¸'K@1N.“LCÒU#\®ù©jÜ(¼w†9ºÜpÜ £6©ªðn©à¾TIøúÀ ¡¡f¶Å7DÏŠ 3×ÊîðE¨»l}²È%T'ßÇ õÑ~*šÐc™Rø»Ü‡=ÐÞíh:rŒÌ 5!g4‹ â˜h\•Û%å1š‚}Ù¨ Í òN°R„ÞÞÙ.[>á #!ÀUNá %/ 0(5w]4au„NŒ^ Žš mœij³³³³³³³³³³³³³³³³³ 0 Nw˜HP DeskJet 540 Printer ,,,, 0(uHš Z ‹6Times New Roman RegularX($¡¡ nc&3|x}j–&äÿU‹ÿÀÀÀ KennebecrulemakinghalogenatedSabatkaGilbergAlmod;varGarloweEmbry OGC>‡¦$"Small Circleð"ðà0  àÝ ƒ!ÝÝ  ÝÔ_ÔÌÌÌÌÌÌÌÌÌÌMr.€Win€Sabatka,€PresidentÌFinishing€Equipment,€Inc.Ì3640€Kennebec€DriveÌSt.€Paul,€MN€55122ÌÌRE:€Halogenated€Solvent€Cleaning€NESHAPÌÌDear€Mr.€Sabatka:ÌÌà  àThank€you€very€much€for€your€continued€interest€in€compliance€issues€associated€with€theÏHalogenated€Solvent€Cleaning€NESHAP€(Part€63,€Subpart€T).€€We€have€reviewed€your€letterÏconcerning€the€need€to€increase€the€freeboard€ratio€on€enclosed€design€machines.€€In€summary,Ïyou€assert€that€the€need€to€increase€the€freeboard€ratio€to€1.0€or€to€use€a€cover€on€a€machine€withÏwhat€you€term€a€ð ðtotal€enclosureðð€is€not€necessary.€You€describe€your€ð ðtotal€top€enclosureðð€toÏinclude€a€horizontal€part€entry€port€as€opposed€to€the€enclosed€design€with€a€vertical€entry€port.€ÌÌà  àUnder€the€NESHAP,€you€are€allowed€to€comply€using€a€freeboard€ratio€of€1.0,€reducedÏroom€draft€or€working„mode€cover,€and€superheated€parts€technology.€€One€of€the€alternatives€forÏdemonstrating€compliance€with€the€reduced€room€draft€is€through€the€use€of€an€enclosed€design.ÏYour€units€include€the€superheated€parts€technology€and€achieve€the€reduced€room€draft€by€meansÏof€your€ð ðtotal€top€enclosureðð€(hereinafter€called€a€horizontal€port€enclosed€design).€€You€haveÏsuggested€that€this€horizontal€port€enclosed€design€also€be€allowed€to€meet€the€requirement€of€aÏcover,€and€the€1.0ò ò€ó ófreeboard€ratio.Ð 0"€  ÐÌÝ‚‡¦ÿÝÝ  ÝÝ‚‡¦£Ýð"ðà0  àÝ  ÝWhile€the€rule€does€notò ò€ó ódistinguish€between€a€horizontal€port€enclosed€design€and€otherÐ  $\" Ðenclosed€designs,€the€supporting€information€for€this€rulemaking€did.€€On€page€3„37€of€theÏð ðNational€Emission€Standards€for€Hazardous€Air€Pollutants:€Halogenated€SolventÏCleaning€„€Background€Information€Documentðð€(EPA„453/R„93„054,€November€1993)Ïthe€EPA€notes€that€ð ðthe€enclosed€design€with€a€horizontal€entry/exit€port€(Figure€3„13.A)Ïis€not€affected€by€room€air€drafts.ðð€€€The€primary€purpose€of€an€increased€freeboard€is€toÏreduce€the€impact€of€room€drafts€across€the€lip€of€a€cleaning€machine.€€An€enclosed€designÏthat€eliminates€òòany€and€allóó€potential€for€drafts€achieves€the€same€purpose€of€an€increasedÐ „*Ô%) Ðfreeboard.€Ýƒ‡¦£¾ÝŒÐ (#(# ÐŒÝ  ÝÐ  \,¬'+ ÐÝ‚‡¦ÿÝÝ  ÝÝ‚‡¦B Ýð"ðà0  àÝ  ÝWhen€measuring€a€freeboard€ratio,€the€numerator€is€the€height€of€the€freeboard€area.€€ThisÐ ° Ðmeasurement€is€taken€because€the€top€of€the€freeboard€area€is€typically€the€point€whereÏambient€air€and€room€drafts€can€impact€the€cleaning€machine.€€Clearly,€on€units€withÏhorizontal€entry€ports,€this€is€not€the€case.€€€In€cases€where€units€with€horizontal€entryÏports€are€designed€such€that€no€air€currents€can€travel€up€the€port€and€into€the€machine,ò ò€ó óÐ `° ÐEPA€agrees€that€increasing€the€actual€freeboard€height€will€not€result€in€any€additionalÏemissions€reductions.݃‡¦B ] ݌Р(#(# ÐŒÝ  ÝÌÝ‚‡¦ÿÝÝ  ÝÝ‚‡¦! Ýð"ðà0  àÝ  ÝCovers,€both€working„mode€and€down„time,€are€used€on€halogenated€solvent€cleaningÐ  d Ðmachines€to€eliminate€drafts€within€the€freeboard€and€to€reduce€diffusion€losses.€€AsÏdiscussed€in€the€background€information€document€for€the€halogenated€solvent€cleaningÏNESHAP€an€enclosed€design,€such€as€the€horizontal€port€enclosed€design,€completelyÏencloses€the€solvent€cleaning€machine€except€for€a€single€opening€through€which€partsÏenter€and€leave€the€enclosure.€Such€enclosed€designs€reduce€idling€and€working€emissionsÏby€creating€a€still€air€environment€inside€the€solvent€cleaning€machine,€which€limits€solventÏdiffusion.€€Furthermore,€the€preamble€to€the€proposal€of€the€halogenated€solvent€cleaningÏNESHAP€(58€FR€62576)€states€that€ð ðan€enclosed€design€is€considered€to€exert€equivalentÏcontrol€as€a€reduced€room€draft,€and€a€cover.ðð€€Therefore,€an€enclosed€design€thatÏeliminates€òòany€and€allóó€potential€for€drafts€achieves€the€same€purpose€of€a€cover.€Ýƒ‡¦! < ÝŒÐLœ(#(# ÐŒÝ  ÝÌà  àIn€conclusion,€the€EPA€agrees€that€a€reasonable€equivalent€compliance€alternative€forÏbatch€cleaning€machines€is€the€horizontal€port€enclosed€design€combined€with€superheated€vaporÏtechnology.€€The€horizontal€port€entry€should€achieve€at€least€the€same€emission€reduction€as€theÏcombination€of€a€reduced€room€draft€and€an€increased€freeboard€ratio,€and€the€combination€of€aÏworking„mode€cover€and€an€increased€freeboard€ratio.€€This€is,€of€course,€contingent€upon€theÏowner€or€operatorððs€ability€to€demonstrate€that€no€air€currents€are€introduced€around€the€machineÏthat€would€travel€up€the€horizontal€entry€port€and€into€the€machine.€€Again,€we€thank€you€for€yourÏinterest€in€exploring€innovative€options€to€help€the€regulated€community€implement€theÏhalogenated€solvent€cleaning€NESHAP€standards.€€Please€contract€Tracy€Back€(202„564„7076)Ïwith€any€questions€regarding€this€NESHAP.ÌÌÌÌà  àà ` àà ¸ àà  àà h àà À àà  àSincerely,ÌÌÌà  àà ` àà ¸ àà  àà h àà À àà  àElliott€Gilberg,€DirectorÌà  àà ` àà ¸ àà  àà h àà À àà  àChemical,€Commercial€Services€and€à Ð àÐ Ð& "% Ðà  àà ` àà ¸ àà  àà h àà À àà  à€€Municipal€DivisionÌÌÌcc:€ÌPaul€Almodð;ðvar,€OAQPSÌCharlie€Garlowe,€OREÌPatricia€Embry,€OGCÐ D-”(, ЇÌ