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# OAR Box 1778 Prepped by Ollie Stewart



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•" i JIQO' ^ UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y Offic e o f Ai rQualit yPlannin g an d Standard s ^^<Z % Researc h Triangl e Park , Nort h Carolin a 277J4-^T\ \ 3 , 0 1 NOV 198

5

MEMORANDUM
SUBJECT : Enforcemen t o f New Sourc e PerformanceJjtandard s fo r Asphal t Concret e Plant s ~ "" *
FROM :



### TO : Jac k R . Farmer , Dire a

Emissio nStandard s an d E n rin g Divisio n(MD-13 ) Edwar d E . Reich , Directo r Stationar y

Sourc e Complianc e Divisio n(EN-341 ) Th e Emissio nStandard s and Engineerin g Divisio n(ESED ) ha s complete d th e secon d revie w

o f th e new

sourc e performanc e standard s (NSPS ) fo r asphal t concret e plants . Ou r revie w include dan assessmen t o f th e availabl e complianc e tes t dat a an d fou r plant s tha t wer e teste db y ESED . Th e dat a obtaine d indicat e tha t ther e ar e some aspect s o f th e standar dtha t deserv e mor e attentio nwit hregar d t o enforcement . Thes e ar e proces s operation , contro l equipmen t operation , visibl e emissions , and reciprocit y waivers . Ther e ar e severa l proces s parameter s tha t shoul db e note ddurin g a n NSP S performanc e test . Thes e are : plan t productio ncapacity , productio n rat e durin g th e test , an d typ e o f product . Becaus e uncontrolle demission s increas e wit ha n increas e i n productio nrate , plant s tha t demonstrat e complianc e whil e operatin g belo w th e norma l productio nrat e ma y b e ou t o f complianc e whe noperate d a t highe r productio nrates . Thi s i s especiall y tru e fo r scrubber-controlle d plants . Ou r revie w o f availabl e complianc e tes t dat a indicate s tha t th e majorit y o f th e test s wer e conducte dwhil e th e plant s wer e operatin g a t les s tha n8 0 percen t o f thei r desig ncapacity . W e recommen d tha t testin g b e conducte da t th e highes t productio nrat e a t whic hth e plan t plan s t o operate . Th e typ e o f mi xproduce ddurin g th e performanc e tes t wil l als o affec t emissions . Ou r dat a indicat e tha t th e typ e o f produc t wit hth e greates t emission s potentia l i s a virgi nsurfac e mix . Productio no f a recycle d mi xo r a bas e mi xdurin g th e tes t wil l resul t i n lowe r uncontrolle d oarticulat e emission s an d wil l no t provid e a n indicatio no f th e performanc 2 capabilitie s o f th e plant . Therefore , w e recommen dtha t test s b e conducte d w^il e producin g a virgi nsurfac e mix . Thi s i s especiall y critica l fo r plant s tha t us e scrubber s fo r control--sinc e scrubber s ar e mor a sensitiv e t o chang e i n inle t loadings .P. 4

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Contro l equipmen t operatin g parameter s provid e anindicatio no f th e performanc e o f th e equipment . I nparticula r th e liqui dflow rat e ar : pressur e dro pacros s ventur i scrubber s i s directl y relate dt o th e scrubbe r performance . Mos t ventur i scrubber s use di nth e asphal t concret e industr y ar e designe dt o operat e a t a pressur e dro po f 1 5 t o 2 0 inche s wate r colum n anda liqui dt o ga s rati o o f 8 t o 1 0 gallon s pe r thousan dactua l cubi c feet . Durin g ou r review , w e foundtha t th e scrubber s ar e typicall y operate da t lowe r pressur e drop s andliqui dt o ga s ratios . Thi s --..-zees th e efficienc y

o f th e scrubbers . We recommen dtha t scrubbe r operr.n g parameter s b e note ddurin g th e complianc e tes t s o a s t o provid e a nindica tio no f prope r operatio no f th e contro l devic e durin g late r inspections . Th e NSP S fo r asphal t concret e include s a visibl e emission s 1i r t o f 2 0 percen t opacity . Visibl e emission s reading s ar e ofte ndifficul t t o mak a a t a scrubber-controlle dplan t du e t o th e presenc e o f anattache d steam plume . A

detache dstea m

plum e i s sometime s observe da t plant s controlle db

y fabri c filters . Inaddition , ther e i s ofte na blu e haz e associate dwit hth e productio no f recycle dasphal t concrete . Th e blu e h*z e generall y

develop s downwin do f th e plan t rathe r tha na t th e stac k vertex . Th e EP A

referenc e Metho d9 specifie s tha t visibl e emission s shoul db e evaluate dbetwee nth e stac k an dstea m plum e fo r detache dplume s o r afte r disappearanc e o f th e steam plum e fo r attache dplumes . Metho d9 doe s no t includ e observation s o f condensin g emission s tha t develo pdow n win do f th e plant . We hav e bee ninforme dtha t visibl e emission s sometime s ar e observe dincorrectl y whe na stea m

plum e o r blu e haz e i s present . W e recommen dtha t observer s o f visibl e emission s b e mad e awar e o f th e correc t procedure s fo r observin g emission s whe na steam o r condensin g plum e i s presen t durin g a nasphal t concret e performanc e test . Durin g ou r review , w e learne do f severa l instance s wher e anasphal t concret e plan t applie dro r a waive r o f testin g requirement s base donth e performanc e o f anothe r plan t o f th e sam e mak e andmodel . Dat a collecte d durin g ou r revie w

indicat e tha t operatin g an dmaintenanc e factors , in additio nt o desig nparameters , affec t th e performanc e o f anasphal t concret e plan t an dit s associate dai r pollutio ncontro l equipment . Fo r thi s reason , tw o individua l plant s o f th e sam e mak e andmode l ma y no t hav e th e sam e emissio nlevel . We d o no t recommen dtha t demonstratio no f complianc e b

y a particula r plan t b e use dt o justif y waivin g th e require - ;.ien t tha t a secon dplan t o f th e sam e typ e conduc t a performanc e test . W e believ e tha t mor e attentio nb y enforcemen t personne l t o tn e area s aascrioe dabov e i s neede dan dwil l resul t inanincreas e i nth e leve l o f complianc e wit hth e standard . I hop e thi s informatio nwil l b e usefu l t o you . Additiona l supportin g dat a i s availabl e i nth e attache dbackgroun d informatio ndocument . I f yo uhav e any question s regardin g ou ~ findin-j s o r reco'nmendations , pleas e cal l Ke nDurke e a t FT S 629-5595 . Attachmen t

cc : Tio bAja x(w/ o attach. ) Sta nCuff e (w/ o attach. ) Ear l Sal o (w/ o attach . J . Crensha w

(w/ o attach. ) G . Emiso n(w/ o attach. ) G . Wals h(w/ o attach. )