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### A-90-1 9 ll-E-49 MEETIN GSUMMAR

Y Date : Jul y28 , 199 2 Subject : Teleconferenc e wit hCM At o Discus s th e Proces s Vent s TR E Equatio n 

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### " " Attendees : Linda Herring , EPA/SD B ': "^\T'\0?• \ \ ' , r Ja n Meyer , EPA/SD B \\^\ l i •P1 * Sheil a Milliken , EPA/SD B •\''\ r Debbi e Stackhouse , EPA/SD B \y• . Q£ Q \ 8 I99 t Lesli e Evans , EPA/CP B V Bo bRosensteel , EPA/CP B v Rut hMead , Radia n\ £;./\/7./*- • 'J.^.^-- ' Thoma s Olsen , Radia nL—-^.I———"-*"' ' Am yMeyers , CM

A(telephone link ) Davi d Gustafson , DowChemica l (telephone link ) Jo e Woolbert , EastmanChemica l (telephone link ) Th e purpos e o f th e teleconferenc e betwee nth e EPA . an d CM A wa s t o discus s tw o issue s concerning th e TR E equatio ni n th e proces s vent s portio n o f th e HONregulation . Th e firs t issu e wa s t o discus s CMA' s reques t t o us e engineering assessment/proces s knowledg e t o determin e th e TR E indexvalu e i naneffor t t o reduc e th e testing burde n fo r measuring th e TR E inpu t parameters . Th e secon d issu e wa s t o discus s a TR E indexvalu e a t whic hmonitoring o f recoverydevic e o r othe r specifie d parameter s woul d no t b e necessary(currentl ya TR E > 8.0) . I . ENGINEERIN

GASSESSMEN

T FORTR E CALCULATION S Th e EPArequeste d tha t CM Agiv e example s o f wha t typ e o f dat a woul d b e use d fo r th e engineering assessmen t o f th e TR E inde xvalue . Th e CM Asuggeste d tha t emission s inventorie s o r othe r permitting effort s woul d contai n th e dat a t o describ e wha t th e emission s ar e a t eac hproces s vent . Specifi c example s give n b yCM Awere :

• Design maximu

mo f equipment , suc ha s pum p siz e o r maximu mloading rates ; htm1 7 (Is ) CHA-MEET.SU MP. 3

• Fo r existing processes , actua l maximu mvalues ;

• Compositio n knowledg e o f product s an d intermediates , mas s balances ;

• Proces s measurements , suc ha s produc t accumulato r liqui d leve l changes ;

• Wors t cas e analysi s o f ven t concentration s base d o n physica l propertie s (saturationcondition s o r 10 0 percen t HAP/VO C composition) ; an d

• Observabl e proces s parameters . Th e CM Aadde d tha t i n th e engineering assessment , a facilit y woul d wan t t o overestimat e th e emission s t o some degre e wit ha safet yfacto r t o b e confiden t i nth e designatio no f th e ven t a s Grou p 1 o r Grou

p 2 . I t wa s note d tha t ther e ar e inaccuracie s i n estimates , an

d a TR E leve l woul d nee d t o b e se t a t some poin t abov e 1. 0 an

d belo wtha t value , testing woul d b e require d t o suppor t th e TR E calculatio n fo r Grou p determination . Th e EPAagree d wit hth e concep t i n principal , bu t maintaine d some reservation s concerning , i nsome cases , th e accuracyo f th e informatio n t o b e use d i nth e TR E calculation . Fo r example , i t migh t no t b e appropriat e t o us e ol d designspecification s wit hn o referenc e o r supporting information . Th e EPAexpresse d concer n o n ho wth e allowabl e type s o f dat a o r informatio n woul d b e specifie d o r clarifie d i nth e regulation . Th e CM Asai d ther e wa s a significan t ris k i na facilit y using inaccurat e informatio n o r engineering assessment s t o calculat e th e TR E sinc e i t coul d mea n a facilit ywa s ou t o f compliance . Th e type s o f informatio ntha t migh t b e use d ar e typicall yi n permits . Th e CM Aagree d t o pu t togethe r a generi c lis t o f allowabl e type s o f informatio n t o calculat e th e TR E indexvalu e a s wel l a s some specifi c example s an d t o suppl yth e lis t befor e th e Augus t 5 , 1992 , EPA/CM Ameeting .

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II . TR E INDE XVALU E MONITORIN GEXEMPTIO

N Th e proces s vent s portio n o f th e curren t draf t HO N regulatio n exempt s proces s vent s wit ha TR E greate r tha n 8. 0 fro m monitoring requirements . Th e CM Aconducte d a nanalysi s o n th e sensitivit yo f th e TR E equatio n base d o n th e ven t stream s presente d i nth e draf t BI D (Volum e C , Table s 2-2 , 2-3 , 2-4 , an d 2-5 ) an

d th e propagatio n o f variatio n o f th e input s throughth e TR E equation . Th e analysi s include d (1 ) specificatio n o f th e expecte d accurac yo f th e engineering assessmen t fo r th e four input s t o th e TR E equation , (2 ) propagatio n o f variatio n o f input s throughth e TR E equation , an d (3 ) calculatio n o f confidenc e intervals . Fo r th e firs t step , expecte d accuracyo f estimates , i t wa s assume d tha t fo r vent s wit hhighconcentration s an d flowrates , engineering assessmen t woul d b e relativel yaccurat e (e.g. , +/

- 1 0 t o 2 0 percent) ; fo r stream s wit hmediu

mflow s an

d concentrations , ther e woul d b e a greate r inaccuracy ; an d fo r lowflow s an

d concentrations , estimate s migh t b e + o r - 1 orde r o f magnitude . Th e result s o f th e analysi s indicate d tha t fo r al l non-halogenate d Grou p 1 proces s vent s th e TR E indexvalu e variatio n wa s les s tha n3.0 . I f a ven t TR E wa s estimate d t o b e abov e 3.0 , inaccuracie s i n engineering assessmen t woul d no t mak e th e TR E fal l belo w1.0 . Fo r halogenate d Grou p 1 proces s vent s th e variatio n i n th e TR E inde xvalu e wa s les s tha n1.5 , howeve r ther e wer e veryfew halogenate d vent s i n th e BID , s o CM Awa s les s confiden t o f thi s value . Th e EPApointe d ou t tha t th e analysi s faile d t o accoun t fo r th e variabilit yo f th e ven t strea mparameters , i.e. , th e fluctuatio n o f ven t strea mflowrat e an

d actua l HAP/VO C concentration . Th e CM Aaske d i f th e TR E equatio ninput s (e.g. , flow , hea t conten t VO C emissio n rate , HA P emissio n rate ) wer e base d o n

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MP. 5

annua l average s o r shor t ter mvalues . Th e CM

Aadde d tha t tes t measurement s ar e onl ya shor t ter mvalu e an

d coul d b e misleading . Th e EPAresponde d tha t the test s wer e t o b e conducte d a t the representativ e proces s operating conditions . Th e sourc e shoul d conduc t test s unde r condition s tha t ar e withi n thei r norma l rang e o f operatio n an

d ar e expecte d t o yiel d th e lowes t representativ e TR E value . Th e rul e i s no t explici t i n defining representativ e conditions , bu t i t i s th e same languag e a s i nth e SOCM I NSP S fo r distillatio n an

d reactors . Th e CM Asai d i f th e rul e specifie d th e us e o f th e wors t value s o f th e yea r (e.g. , wors t cas e evaluation ) t o inpu t int o th e TR E equation , th e safetyleve l woul d b e incorporate d an d th e leve l o f comfor t woul d b e sufficien t t o allowTR E o f 3. 0 a s th e testing an

d monitoring exemptio nlevel . Th e EPApropose d tha t a singl e TR E indexvalu e greate r tha n 1. 0 b e se t a s th e leve l wher e vent s wit ha TR E greate r tha n th e valu e ar e no t subjec t t o monitoring requirements , an d engineering assessmen t o f th e TR E valu e i s acceptable . Th e curren t leve l i n th e rul e i s 8.0 . Using 8. 0 a s an example , i f a sourc e use d engineering assessmen t an d calculate d a TR E greate r tha n 8.0 , testing an

d monitoring woul d no t b e required . I f th e engineering assessmen t resulte d i n a TR E leve l les s tha n8.0 , testing woul d b e require d t o suppor t th e grou p determinatio n(i f th e estimate d valu e i s belo w1.0 , th e facilitymaytes t t o determin e TR E o r may choos e t o contro l withou t furthe r TR E testing/grou p determination) . An alternativ e i s t o se t on e TR E indexvalu e leve l fo r monitoring exemption s an d a TR E indexvalu e leve l above tha t fo r allowing the,us e o f engineering assessment . Fo r example , th e rul e coul d specif ya TR E indexo f 4. 0 a s a monitoring leve l an d a TR E indexo f 8. 0 a s th e engineering assessmen t level . Testing mus t b e performe d t o establis h monitoring paramete r ranges , s o th e TR E valu e selecte d fo r th e us e o f engineering ' assessmen t mus t b e a t leas t a s higha s th e valu e selecte d fo r monitoring . Th e EPAagree d t o conside r us e o f

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M 4P. 6

a singl e TR E leve l fo r th e monitorin g exemptio n an d th e us e o f engineerin g assessmen t and t o determin e a TR E betwee n 3. 0 and 8. 0 fo r tha t level . Th e EP Arequeste d tha t CMAprovid e th e calculation s fo r CMA' s TR E analysis . III . ACTIO NITEMS : (1 ) Th e CMAagree d t o provid e a lis t o f engineerin g assessmen t procedure s fo r th e Augus t 5 , 1992 , CMA/EP Ameeting . (2 ) Th e CMAagree d t o provid e thei r procedure s an d calculation s o n th e TR E analysi s an d variabilit ystudy .

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