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# OAR Box 1252 Prepped byCandice Davis



### Document

Number: 

# 51 ) ll-B-1 1 Docket Number: 

# A-90-2 2

Printed 5/21/200811:46:01 AM Sheet 51 of 184P. 2

MEMORANDUM DATE : TO : FROM : SUBJECT : 

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Novembe r 25 , 199 1 HONProjec t Fil e Ma e L . Thomas , Radia n Interpretatio no f Louisiana Rul e fo r Contro l Transfe r Operation s an d th e Compute r Cod e o f th e Rul e fo r th e HONFramewor k Th e purpos e o f thi s memorandu mi s t o presen t th e interpretatio no f th e Louisiana transfe r rul e an d t o explai n compute r coding th e rul e int o th e HONFramework . Th e baselin e contro l requirement s impose d b yth e Stat e regulation s represen t th e leve l o f contro l i nth e absenc e o f th e HONan d wil l b e use d i nth e impact s analysis . Th e Louisian a transfe r rul e applie s t o loading volatil e organi c compound s (VOC's ) wit ha vapo r pressur e o f 1. 5 psi a o r mor e int o tanks , trucks , o r trailers . VOC' s a s define d b yth e Louisian a rule , ar e an yorgani c compound whic hparticipate s i n atmospheri c photochemica l reactions . Th e Louisian a rul e ha s a throughpu t cutof f o f 40,00 0 gal/dayaverage d ove r 3 0 day s fo r facilitie s buil t befor e May20 , 197 9 an d 20,00 0 gal/dayaverage d ove r 3 0 day s fo r facilitie s buil t afte r May20 , 1979 . A throughpu t cut-of f o f 40,00 0 gal/dayfo r al l facilitie s wa s use d i nth e compute r coding o f thi s rul e becaus e th e ag e o f th e facilitie s wa s no t known . Th e contro l require d b ythi s rul e i s a vapo r retur nlin e t o th e dispensing vesse l (vapo r balancing ) o r a disposa l systemwit h a destructive/remova l efficienc yo f 9 0 percent . A9 0 percen t efficien t vapo r recoverydevic e wa s use d i ncompute r coding th e requiremen t o f thi s rule . I ncompute r coding th e Louisiana rule , a fewadditiona l assumption s wer e made . I t wa s assume d tha t chemical s wit hvapo r pressure s greate r tha n14. 7 psi a wil l b e transferre d unde r

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pressur e an

d therefor e wil l no t hav e an yemission s t o control . Also , th e assumptio nwa s mad e tha t th e 40,00 0 gal/daythroughpu t cut-of f applie d t o on e chemica l being transferre d vi a a give n vehicl e typ e (i.e. , tank truc k o r tank car) . Therefore , fo r a facilit yt o mee t th e contro l criterion , th e throughpu t o f a chemica l transferre d b ya give nvehicl e typ e woul d hav e t o excee d 4 0,00 0 gal/day . Thi s assumptio nresult s i nfewe r facilitie s requiring Stat e contro l a t baselin e tha ni f i t had bee nassume d th e 40,00 0 gal/daycutof f applie d t o th e combinatio no f al l chemical s an

d al l vehicl e type s loade d a t th e facility . A s a resul t o f thi s assumption , th e analysi s o f th e impact s o f th e HON regulatoryoption s show s tha t mor e facilitie s ar e uncontrolle d a t baselin e an

d wil l b e require d b yth e HONt o ad

d controls , giving highe r HONcos t an d highe r HONemissio n reductio nestimates . A sensitivit yanalysi s performe d o nthi s assumptio nshowe d tha t 1 7 percen t mor e rack s (nationwide ) woul d requir e contro l a t baselin e i f i t had bee nassumed , fo r al l stat e regulation s analyzed , tha t th e throughpu t applie d t o al l regulate d chemical s transferre d a t th e facility. 1 However , thi s assumptio ndi d no t affec t th e MAC T floo r determination . I norde r t o determin e th e baselin e contro l requirement , th e HO Ntransfe r dat a bas e TR_ASSG.DB F i s accesse d t o obtai nth e actua l tank truc k (field : TT_TP ) an d tank ca r annua l throughpu t (field : RC_TP) . Th e HONtransfe r program currentl yaccesse s th e fiel d an

d carrie s th e dat a i nth e memoryvariables : M_TOT_TTT P an d M_TOT_RCTP . Depending o nth e vehicl e type , on e o f thes e i s the nassigne d a s th e throughput . Throughpu t i s i nunit s o f thousand s o f gallon s pe r year . Therefore , i t mus t b e converte d t o thousand s o f gallon s pe r da yt o b e compare d wit hth e Louisian a throughpu t cut-of f o f 4 0 thousand gallons/day . T o performth e conversion , th e throughpu t i s divide d b y36 5 multiplie d b yth e capacit yutilizatio nfacto r (HON_CHEM->US_CAPUTIL) . Th e assumptio ni s tha t facilitie s transfe r everydaytheyproduce . Multiplyin g th e numbe r o f day s i na yea r b yth e capacit y utilizatio nfacto r estimate s th e numbe r o f day s i na yea r th e lousrule(htm

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facilit ytransfer s product . Th e capacit yutilizatio nfacto r represent s th e differenc e betwee nth e amoun t o f produc t produce d an d th e facility' s tota l capacit yt o produce . Thi s assumptio n mayunderestimat e th e leve l o f baselin e contro l an d resul t i n overestimating cost s an d emissio nreduction s attributabl e t o th e HON . Th e compute r coding read s a s follows : I F M_VECHTYP E = 'TT ' M_TOT_T P = M_TOT_TTTP/(36 5 * HON_CHEM->US_CAPUTIL ) ELS E M_TOT_T P = M_T0T_RCTP/(36 5 * HON_CHEM->US_CAPUTIL ) Onc e th e throughpu t dat a hav e bee ncollected , th e dat a wer e compare d t o th e Louisian a requirement s an d a baselin e percen t reductio nan

d a baselin e contro l devic e ar e assigned . Th e compute r coding t o d o th e comparing an d assigning read s a s follows : I F M_TOT_TP>=4 0 .AND . M_VAP_PR>=77.5 5 .AND . M_VAP_PR<76 0 M_REDUC T =0.9 0 M_CTLDE V

= 'VAPO

RRECOVERY ' ELS E M_REDUC T = 1 M_CTLDE V

= 'NONE ' ENDI F Fo r thos e chemical s transferring a t 40,00 0 gal/dayo r greate r an

d having a vapo r pressur e greate r tha n1. 5 psi a (77.6 6 mmHg ) an

d les s tha n14. 7 psi a (76 0 mmHg) , th e Louisian a contro l requiremen t o f vapo r recoveryan d a reductio no f 0.9 0 (9 0 percent ) wa s assigned . N o contro l devic e an d a reductio no f 1 ar e assigne d fo r thos e chemical s no t withi nth e vapo r pressur e rang e o r withi n th e throughpu t range . Th e reductio no f 1 doe s no t indicat e tha t 10 0 percen t o f emission s ar e reduced . Rather , i t i s use d b

yth e compute r cod e a s a fla g meanin g n o baselin e o r Stat e control .

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REFERENCE S 1 . Thomas , M.L. , Radia nCorporation , t o HONProjec t File , January24 , 1992 . Sensitivit yAnalysi s o f th e Minimu m Throughpu t Assumptio ni nth e Interpretatio no f th e Stat e Regulation s an

d th e Benzen e NESHA P fo r Transfe r Loading Operations .

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