# OAR Box 1313 Prepped by LaTeia Shed



## Document

Number: 

# 58 ) ll-B-3 2

Docket Number: 

# A-88-0 2

Printed 6/12/20089:03:29AM Sheet 58of 99 p. 1P. 2

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UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENCYA-88-0 2 I ^tyl S Offic e o fAi rQualityPlannin g an d Standard s X-^-^o , \*dlk£f

Researc h Triangl e Park , Nort h Carolin a 2771 1

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MEMORANDU

M 

### j SUBJECT : Chromiu

m Electroplatin g NESHAP : Trivalen t Chromiu m Proces s Capita l Cost s (12/1/8 7 Draft )
FROM : Bil l Vatavu k

CEIS , SDB , ES D (MD-13 )
TO : Do nGillett e

CEIS , SDB , ES D (MD-13 )
A t you r request , I hav e reviewe dth e subjec t costs , whic hsupplemen t th e cos t dat a I reviewe dfo r yo ulas t month . (Se e m y Novembe r 3 0 memo. ) M y comment s o

nthes e trivalen t proces s cost s ar e itemize dbelow : Pag e 1,111 : I f th e trivalen t chromium proces s i s "technicall y superior " t o th e hexavalen t process , shouldn' t w e attribut e par t o f th e cos t differenc e betwee nthes e two technique s t o "proces s improvement" ? (I t doesn' t see m reasonabl e t o attribut e th e entir e incrementa l cos t t o ai r pollutio ncontrol. ) Pag e 2 , 1

1 1 : Ho

w wel l d o th e capita l cost s fo r th e othe r trivalen t processe s compar e wit hth e "Tri-Chrome ® L C Plus " proces s cost ? (T o thi s end , i t migh t b e helpfu l t o ad

da tabl e listin g th e capita l cost s fo r al l trivalen t processe s o nsome commo nbasis , say , $/ga l o f tan k capacity. ) Pag e 4 , 1

1 1 : Wher e i nTabl e 5 ar e th e hexavalen t chromium proces s costs ? (Onl y cost s fo r th e trivalen t proces s appea r i nTabl e 5. ) Pag e 4 , 1

1 2 : I f th e trivalen t platin g facilitie s bein g studie dus e differen t chromiu m solutions , ho

w ca nthei r cost s b e compare dt o th e cost s presente d i nTable s 3 , 4 , an

d5 ? Explain , please . Tabl e 2 :

° Th e tan k capacitie s don' t see m consisten t wit hthei r dimensions . Fo r example , th e smalle r tan k (12. 0 f t x3. 5 f t x6. 0 ft ) ha s a tota l volume o f 252 y ft 3 = 1,885'gal . However , a capacit y o f 1,73 0 ga l (o r 91.8 % full ) i s liste dfo r it . I s thi s becaus e th e tan k i s neve r completel y ful l whe nbein g used ?

° Eve ni f we assume tha t eac htank i s operate da t les s tha n100 % full , th e capacitie s give nstil l ar e no t consisten t wit heac hother . Th e tota l



## AP. 3

volum e o f th e large r tank i s 64 8 ft 3 = 4,85 0 ga l (12. 0 f t x6. 0 f t x9. 0 ft) . However , th e liste dcapacity , 4,580'gal , i s 94.5%'o f th e tota l volume . Wh y i s th e large r tan kvolume utilizatio nhighe r tha ntha t o f th e smalle r tank ?
Tabl e 3 :

o Pleas e lis t th e reference s fo r al l th e cost s inthi s table . (Presumably , th e solutio nan dequipmen t cost s came fro m Harshaw/Filtrol . I f so , pleas e s o indicate. )

o Th e chromiu

m solutio npurchase dandwast e disposa l cost s shoul db e proportiona l t o th e tankcapacitie s - - bu t the y ar e not . Fo r instance , th e large-to-smal l tan kcapacit y rati o i s 2.65 % whil e th e correspondin g ratio s o f th e solutio npurchase dan ddisposa l cost s ar e 2.5 0 an d2.21 , respectively . Pleas e correc t thi s error .

° Similarly , th e tan kline r cos t shoul db e directl y proportiona l t o th e interio r surfac e are a o f th e tank . However , th e large-to-smal l tan k surfac e are a rati o i s 1.74 ^ whil e th e tan k line r cos t rati o i s 1.65 . Tabl e 5 :

° Base donth e uni t cost s i nfootnot e "a" , th e "small " and"medium " mode l plan t startu pcost s shoul db e $2,80 0 and$8,300 , respectivel y (no t $3,00 0 and$9,000 , a s shown) .

° Th e mode l tankdirec t installatio ncost s see m quit e low , compare d t o th e purchase dequipmen t an dindirec t installatio ncosts . (Ho w firm ar e thes e installatio ncosts? )

Pleas e conve y

thes e comment s t o IS B at you r convenience . I nth e meantime , i f yo uhav e an y questions , pleas e phon e o r sto pby .
cc : Bo bAja x(MD-13 ) A l Weh e (MD-13 )



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