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# OAR Box 1168 Prepped by Ollie Stewart



### Document

Number: 

# 93 ) ll-C-22 Docket Number: 

# A-89-1 0

Printed 4/29/2008 11:23:20 AM Sheet 93 of 131 $

# A-89-1 0 P. 2

*. v , * 0Sr % IT- P •>-> ° mf\ \ UNITE D STATE S ENVIRONMENTA L PROTECTI O

Offic e o f Ai rQualit yPlannin g an d Stand i Researc h Triangl e Park , Nort h Carolin a 2771 1



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### j EP A AI R DOCKE T Enclose dar e two ba r chart s showin g flang e lea kdat a for-Hre-et'lTyren y oxid e andbutadien e plants , andfo r plant s i nth e "2 4 uni t study. " Th e latte r i s a nearl y 1980' s study

o f 2 plant s a t eac ho f 1 3 chemica l processes . I n eac hchart , th e bar s represen t th e percen t o f flange s tha t wer e leakin g i nth e sampl e from

eac hplant . Th e valu e abov e th e ba r i s th e sampl e siz e a t eac h plant . Intotal , 4 1 plant s wer e sampled . A t a 50 0 pp m lea kdefinition , sample s a t 1 0 plant s exceede d5 percen t leakers ; 1 7 ou t o f 4 1 ha dlea kfrequencie s abov e 2 percent . Thes e dat a indicat e clearl y tha t th e numbe r o f flange s tha t lea ka t a facilit y

ca nb e high . Base donestimate demissio nrate s calculate d b y CM A i nth e E O an

dB D studie s an

d th e highlea kfrequencie s a t man y o f th e plants , i t i s apparen t tha t flang e emissio nrate s ar e significan t an dca n accoun t fo r a hig hpercentag e o f th e emission s a t a plan t wher e othe r equipmen t i s controlled . Thes e dat a als o indicat e tha t flang e lea k frequencie s belo w

0. 5 percen t andeve napproachin g zer o ar e possible . W e believ e tha t thes e lea kfrequenc y dat a indicat e clearl y tha t flang e monitorin g i s necessar y

t o assur e a low

percentag e o f leakin g flanges . I nth e absenc e o f regulation , th e dat a show conclusivel y

tha t low

lea kfrequencie s wil l no t necessaril y

occur . We d o agre e tha t flang e lea koccurrenc e rate s shoul db e lowe r tha nvalv e lea koccurrenc e rates . However , thi s i s no t necessaril y s o i nal l cases . A s such , w e believ e a

nextende dmonitorin g frequenc y i s reasonabl e wher e low lea k frequencie s ar e consistentl y maintained . However , wher e low lea kfrequencie s ar e no t consistentl y

demonstrated , w e believ e quarterl y monitorin g i s needed . Attache di s a diagra m o f a monitorin g schem e tha t woul dmee t ou r interest . We hav e reviewe dth e CM A flang e discussio ndate dMa y 7 , 1990 , whic h conclude s tha t ther e i s ver y littl e t o b e gaine db y an y flang e monitorin g requirement . However , w e findnothin g i nth e discussio ntha t support s th e conclusion . Mor e specifically , th e CM A materia l doe s no t addres s th e larg e percentag e o f plan t sample s tha t hav e hig hlea kfrequencies . Ro nBerglund' s analysis , fo r example , consider s averag e lea kfrequencies ; i t doe s no t conside r th e larg e numbe r o f plant s wit hfrequencie s greate r tha n2 t o 5 percen t a t 50 0 ppm . Similarly , th e basi s fo r th e introductor y sectio ni

nth e CM A handou t i s oriente daroun demissio nfactor s andaverag e performance . I t ignore s th e actua l dat a reporte db y CM A tha t show s highlea kan demission s a t man y plants . Sincerely , 

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