p. 1



# OAR Box 

# 1868 Prepped byOllie Stewart



### Document

Number: 

# 15 ) VII-A- 3 Docket Number: 

# A-90-0 7

Printed 11/26/20088:35:12 AM

Sheet 15of 258P. 2

•y

. / • r- »1 

# 3 WZlyffU

ENVIRONMENTAL PROTECTIONAGENCY

Noticeof ProposedRulemaking FUEL S AND FUEL ADDITIVE S REGISTRATIONREGULATIONS TECHNICAL REVISION S

ProposedChanges toRegulatoryText

(40CF RPart79 )P. 3

Fo r th e reason s describe d i nth e preamble , par t 7 9 o f Titl e 4 0 o f th e Cod e o f Federa l Regulation s i s propose d t o b e amende d a s follows : 1 . Th e authorit ycitatio nfo r par t 7 9 i s propose d t o remai na s follows : Authority : 4 2 U.S.C . 7414 , 7524 , 754 5 an d 7601 . 2 . Sectio n79. 2 i s propose d t o b e amende d byrevisin g paragraph s (d ) and (e) , an d byaddin g paragrap h(k) , t o rea d a s follows : S 79. 2 Definitions . (d ) Fue l manufacture r mean s anyperso nwho , fo r sal e o r introductio nint o commerce , produces , manufactures , o r import s a fue l o r cause s o r direct s th e alteratio no f th e chemica l compositio no f a bul k fuel , o r th e mixtur e o f chemica l compound s i n a bul k fuel , byaddin g t o i t a nadditive , excep t tha t (1 ) a part y wh o add s a quantit yo f additive(s ) amountin g t o les s tha n1. 0 percen t byvolum e o f th e resultan t additive(s)/fue l mixtur e i s no t therebyconsidere d a fue l manufacturer , and (2 ) a part ywh o qualifie s a s a smal l busines s unde r th e criteri a i n§ 79.58(d)(2 ) o f thi s subpart , an d wh o add s a noxygenat e compound(s ) t o fue l i s no t therebyconsidere d a fue l manufacturer . (e ) Additiv e mean s anysubstance , othe r tha non e compose d solel yo f carbo nand/o r hydrogen , tha t i s intentionall yadde d t o a fue l name d i nth e designatio n(includin g anyadde d t o a moto r vehicle' s fue l system ) an d tha t i s no t intentionall yremove d prio r t o sal e o r use . (k ) Oxygenat e compoun d mean s a noxygen-containing , ashles s organi c compound , suc ha s a nalcoho l o r ether , whic hma yb e use d a s a fue l o r fue l additive .P. 4

3 . Sectio n79.5 1 i s propose d t o b e amende d byrevisin g paragraph s (c ) (1 ) (ii ) (A ) an d (B ) t o rea d a s follows : § 79.5 1 Genera l requirement s an dprovisions .

**** * (c ) . * * * (l)(i ) * * * (ii ) Fo r these , products , th e manufacture r mus t als o satisf y th e requirement s an d tim e schedule s i neithe r o f th e followin g paragraph s (c)(1)(ii)(A ) o r (B ) o f thi s section : (A ) N o late r tha nMa y27 , 1997 , al l applicabl e Tie r 1 an d Tie r 2 requirement s mus t b e submitte d t o EPA , pursuan t t o § § 79.52 , 79.53 , an d 79.59 ; o r (B ) N o late r tha nMa y27 , 1997 , al l applicabl e Tie r 1 requirement s (pursuan t t o § § 79.5 2 and 79.59) , plu s evidenc e o f a contrac t wit ha qualifie d laborator y(o r othe r suitabl e arrangement ) fo r completio no f al l applicabl e Tie r 2 requirements , mus t b e submitte d t o EPA . Fo r thi s purpose , a qualifie d laborator y i s on e whic hca ndemonstrat e th e capabilitie s an d credential s specifie d i n§ 79.53(c)(1) . I naddition , b yMa y26 , 2000 , al l applicabl e Tie r 2 requirement s (pursuan t t o § § 79.5 3 an d 79.59 ) mus t b e submitte d t o EPA .

4 . Sectio n79.5 1 i s als o propose d t o b e amende d byrevisin g th e firs t sentenc e o f paragrap h(e ) (1 ) t o rea d a s follows : S 79.5 1 Genera l requirement s an dprovisions . (e ) Inspectio n o f a testin g facilitv . (1 ) Atestin g facility , whethe r engage d i nemission s analysi s o r healt hand/o r welfar e effect s testin g unde r thes

- regulations , s'\a3 1 permi t a n authorize d employe e o r dul ydesign e • \Jd representat ; i o f i Aa t reasonabl e time s an d i na reasonabl e manner , t o inspec t th e facilit yan d t o inspec t (an d i nth e cas e o f record s als o t o copy ) al l record s an d specimen s require d t o b e maintaine d regardin g studie s t o whic hthi s rul e applies .P. 5

5 . Sectio n79.5 1 i s als o propose d t o b e amende d byrevisin g th e introductor ytex t t o paragrap h(h ) a s wel l a s paragrap h(h)(1)(ii ) t o rea d a s follows : S 79.5 1 Genera l requirement s andprovisions . (h ) Specia l Requirement s fo r Additives . Whe na nadditiv e i s th e tes t subject , th e followin g rule s apply : (1)(ii ) Additive s belongin g t o mor e tha non e fue l family . (A ) I f a nadditiv e produc t i s registere d i n tw o o r mor e fue l familie s a s o f Ma y27 , 1994 , the nth e manufacture r o f tha t additiv e i s responsibl e fo r testin g (o r participatin g i ngrou p testin g of ) th e respectiv e additive/bas e fue l mixture s i ncomplianc e wit hth e requirement s o f thi s subpar t fo r eac hfue l famil yi nwhic hth e manufacture r wishe s t o maintai na registratio n fo r it s additive . (B ) I f a manufacture r i s seekin g t o registe r suc hadditiv e i n tw o o r mor e fue l familie s then , fo r testin g an d registratio n purposes , th e additiv e shal l b e considere d t o b e a membe r o f eac h fue l famil yi nwhic hth e manufacture r i s seekin g registration . Th e manufacture r i s responsibl e fo r testin g (o r participatin g i ngrou p testin g of ) th e respectiv e additive/bas e fue l mixtur e i ncomplianc e wit hth e requirement s o f thi s subpar t fo r eac hfue l famil yi nwhic h th e manufacture r wishe s t o obtai na produc t registratio nfo r it s additive .P. 6

6 . Sectio n79.5 1 i s als o propose d t o b e amende d byaddin g a ne w paragrap h(i)(4) , t o rea d a s follows : S 79.5 1 Genera l requirement s an dprovisions . 

### (i ) 

### * * *

**** * (4 ) Th e presenc e i na particula r oxygenatin g additiv e o f smal l amount s o f othe r unintende d oxygenat e compound s a s byproduct s o f th e manufacturin g proces s o f th e give noxygenatin g additiv e doe s no t affec t th e groupin g o f tha t additiv e and doe s no t creat e multipl e testin g responsibilitie s fo r manufacturer s wh o blen d tha t additiv e int o fuel .

7 . Sectio n79.5 2 i s propose d t o b e amende d byrevisin g paragrap h (a ) an d removin g an d reservin g paragrap h(c) , t o rea d a s follows : § 79.5 2 Tie r 1 (a ) Genera l Specifications . Tie r 1 require s manufacturer s o f designate d fuel s o r fue l additive s (o r group s o f manufacturer s pursuan t t o § 79.56 ) t o suppl yt o th e Administrator : th e identif y an d concentratio no f certai nemissio nproduct s o f suc hfuel s o r additives ; an d anyavailabl e informatio nregardin g th e healt han d welfar e effect s o f th e whol e an d speciate d emissions . I nadditio n t o anyinformatio nrequire d unde r § 79.5 9 an d i nconformanc e wit h th e reportin g requirement s thereof , manufacturer s shal l provide , pursuan t t o th e timin g provision s o f § 79.51(c) , th e followin g information . (b ) * * * (c ) Reserve d

**** *P. 7

8 . Sectio n79.5 2 i s als o propose d t o b e amende d b yrevising paragraph s (b)(1)(iii ) an d (b)(1)(iv) , a s wel l a s th e introductory tex t t o paragraph s (b)(2)(iii)(D ) an d (b)(2)(iii)(E) , t o read a s follows : § 79.5 2 Tier 1 .

* * * * (b ) Emission s Characterization .

**** * (1)(iii ) Measuremen t o f backgroun d emissions : I t i s require d tha t ambient/dilutio nai r b e analyze d fo r level s o f background chemica l specie s presen t a t th e time o f emission s sampling (for bot hcombustio nan

d evaporative emissions ) an d tha t sampl e value s b e correcte d b

ysubstracting th e concentration s contribute d b yth e ambient/dilutio nair . Backgroun d chemica l specie s measurement/analysi s during th e FT P i s specifie d i n§ § 86.109

- 94(c)(5 ) an

d 86.135-9 4 o f thi s chapter . (1)(iv ) Concentration s o f emissio nproduct s shal l b e reporte d eithe r i nunit s o f gram s pe r mil e (g/mi ) o r gram s pe r brake

horsepower/hou r (g/bhp-hr ) (for chassi s dynamomete r an d engin e dynamomete r tes t configurations , respectively) , a s wel l a s i nunit s o f weigh t percen t o f measure d tota l hydrocarbons . (2)(iii)(D ) Th e analytica l metho d use d t o measur e specie s o f PAH s an

d NPAH s shoul d b e capabl e o f detecting a t leas t 1 pp m (equivalen t t o 0.00 1 microgra m(/xg) o f compoun

d pe r milligramo f organi c extract ) o f thes e compound s i nth e extractabl e organi c matter . Th e concentratio no f eac hindividua l PA H o r NPA

H compoun

d identifie d shal l b e reporte d i nunit s o f microgrampe r mil e o r nanogram s pe r brake-horsepower/hou r (for chassi s dynamomete r an d engin e dynamomete r tes t configurations , respectively) . Eac h compoun d whic hi s presen t a t 0.00 1 /x g pe r mil e (0. 5 nanogram s pe r brake-horsepower/hour ) o r jr e mus t b e identified , measured , an d reported . Th e following individua l specie s shal l b e measured : (2 ) (iii ) (E ) Th e analytica l metho d use d t o measur e speci e - - an d classe s o f PCDD/PCDF s shoul d b e capabl e o f detecting a t leas

- 1 par t pe r trillio n(ppt ) (equivalen t t o 0.00 1 picogram(pg ) o f compound pe r milligramo f organi c extract ) o f thes e compound s i n th e extractabl e organi c matter . Th e concentratio no f eac h individua l PCDD/PCD F compound identifie d shal l b e reporte d i nunit s o f picogram s (pg ) pe r mil e o r picogram s pe r brake-horsepower/hou r (for chassi s dynamomete r an d engin e dynamomete r tes t configurations , respectively) . Eac hcompoun d whic hi s presen t a tP. 8

0. 5 pg/mil e (0. 3 pg/bhp-hr ) o r mor e mus t b e identified , measured , an d reported . 9 . Sectio n79.5 6 i s propose d t o b e amende d b ydeleting th e phrase , "heav yoi l deposits, " fro mparagraph s (e)(3)(i)(B ) an d (ii)(B) , t o read a s follows : S 79.5 6 Fue l an

dfue l additiv

e groupin

gsystem .

**** * (e ) * * ' *

**** * (3)(i)(B ) Th e Non-Baselin e Gasolin e categoryi s comprise d o f gasolin e fuel s an d associate d additive s whic h-w^nfor mt o th e specification s i nparagraph(e)(3)(i)(A ) o f thi s sectio nfo r th e Baselin e Gasolin e categoryexcep t tha t theycontai n1. 5 percen t o r mor e oxyge nb

yweigh t and/o r mayb e derive d fro m syntheti c crudes , suc ha s thos e prepare d fro mcoal , shal e an

d ta r sands , an

d othe r non-conventiona l petroleu msources . (3)(ii)(B ) Th e Non-Baselin e Diese l categoryi s comprise d o f diese l fuel s an

d associate d additive s whic hconform t o th e specification s i nparagraph(e)(3)(ii)(A ) o f thi s sectio nfo r th e Baselin e Diese l categoryexcep t tha t theycontai n1. 0 percen t o r mor e oxyge nb

yweigh t and/o r mayb e derive d fro m syntheti c crudes , suc ha s thos e prepare d fro m coal , shal e an

d ta r sands , an

d othe r non-conventiona l petroleu msources .

10 . Sectio n 79.5 6 i s als o propose d t o b e amende d b ydeleting th e phras e "o r process " fro mth e introductorytex t t o paragraph s (e ) (4 ) (ii ) (A . (3) an d (B ) .3 ) . an

d b yrevising paragraph (e)(4)(ii)(A. (3) (ii. . th e introductorytex t t o paragraph (e)(4)(ii)(B)I21 , paragraph s (e)(4)(ii)(B)(2)(i ) an d (ii) , an

d paragraph(e)(4)(ii)(B . (3 ) (ii ) . t o read a s follows : S 79.5 6 Fue l an

diue l additiv

e groupin

gsystem . (e ) * * *

* * * * * (4 ) * * *P. 9

****, * (ii ) * * *

**** * (3. ) Separat e non-baselin e gasolin e group s shal l als o b e define d fo r gasolin e formulation s derive d fro m eac hparticula r non conventiona l petroleu msource . (ii ) Th e representativ e fo r an ysuc hgrou

p shal l b e a fue l refine d entirel yfro mth e applicabl e syntheti c sourc e or , i f a 10 0 percen t syntheti c fue l i s unfi t fo r engin e operation , the nth e representativ e shal l b e a fue l refine d fro m th e highes t percentag e o f syntheti c feedstoc k suitabl e fo r operating th e relevan t engin e type . Th e representativ e fue l maycontai na limite d complemen t o f additive s whic har e essentia l fo r th e fuel' s productio nand/o r fo r th e successfu l operatio no f th e tes t vehicle/engin e throughou t th e mileag e accumulatio nan d emissio ngeneratio nperiods . Suc h additive s shal l confor mt o th e additiv e guideline s prescribe d i n§ 79.55(b)(2 ) fo r gasolin e bas e fuel . (B ) * * *

**** * (2. ) Aseparat e non-baselin e diese l grou p i s als o define d fo r eac ho f th e following classe s o f oxygenating compounds : mixe d nitroso

- compounds ; mixe d nitro-.compounds ; mixe d alky l nitrates ; mixe d alky l nitrites ; peroxides ; furans ; mixe d alky l ester s o f plan t and/o r anima l origi n("biodiesel") . I nth e cas e o f an y biodiese l fue l group , th e representativ e t o b e use d i ntesting shal l b e formulate d a s specifie d fo r syntheti c diese l fuel s i n paragraph(e)(4)(ii)(B)(3)(ii > o f thi s section . Fo r an yothe r diese l group s define d b yth e liste d classe s o f oxygenating compounds , th e representativ e t o b e use d i ntesting shal l b e formulate d a s follows : (i. ) Fromth e clas s o f compound s whic hdefine s th e group , a particula r oxygenat e compound (or mixtur e o f compounds ) shal l b e chose nfrom

among al l suc hcompound s recorde d fo r an yfue l o r additiv e i nth e group . (ii ) Th e selecte d compound (or mixture ) shal l b e th e on e recorde d wit hth e highes t actua l o r recommende d maximu m concentration-in-us e fo r an ymembe r product . Thi s compound o r mixture , whe nmixe d int o th e diese l bas e fue l a t th e indicate d maximu mconcentration , shal l serv e a s th e grou p representative .P.1 0

(3_ ) Aseparat e non-baselin e diese l grou p shal l als o b e define d fo r eac hdiese l fue l derive d fro ma particula r syntheti c petroleu

msource . (ii ) Th e representativ e fo r an ysuc hgrou

p shal l b e a fue l refine d entirel yfro m th e applicabl e syntheti c sourc e or , i f a 10 0 percen t syntheti c fue l i s unfi t fo r engin e operation , the nth e representativ e shal l b e a fue l refine d fro mth e highes t percentag e o f syntheti c feedstoc k suitabl e fo r operating th e relevan t engin e type . Th e representativ e fue l ma ycontai na limite d complemen t o f additive s whic har e essentia l fo r th e fuel' s productio nand/o r fo r th e successfu l operatio no f th e tes t vehicle/engin e throughou t th e mileag e accumulatio nan d emissio ngeneratio nperiods . Suc h additive s shal l confor mt o th e additive guideline s prescribe d i n§ 79.55(c)(2 ) fo r diese l bas e fuel . 'P.1 1

11 . Sectio n79.5 7 i s propose d t o b e amende d byrevisin g paragraph s (b)(2) , an d addin g ne wparagraph s (e)(1)(i)(c ) and (e)(1)(iii)(A) , t o rea d a s follows : S 79.5 7 Emissio ngeneration .

**** * (b)(2)(i ) Avehicl e o r engin e ma yb e use d t o generat e emission s fo r th e testin g o f mor e tha non e fue l o r additive , provide d tha t al l suc hfuel s and . additive s belon g t o th e sam e fue l famil ypursuan t t o § 79.56(e)(i) , and that , onc e a vehicl e o r engin e ha s bee nuse d t o generat e emission s fo r a natypica l fue l o r additiv e (pursuan t t o § 79.56(e)(2)(iii)) , i t shal l _ot b e use d i n th e testin g o f anyothe r fue l o r additive . Section s 79.57(a)(2 ) an d (3 ) shal l appl yonl yt o th e firs t fue l o r additiv e tested . (ii ) Prio r t o bein g use d t o generat e emission s fc r testin g a n additiona l fue l o r additive , a vehicl e o r engin e whic hha s previousl ybee nuse d fo r testin g a differen t fue l o r additiv e shal l underg o a neffectiv e intermediat e preconditionin g cycl e t o remov e th e previousl yuse d fue l an d it s emission s fro mth e vehicle' s fue l an d exhaus t system s an d fro mth e combustio nemissio nan d evaporativ e emissio ncontro l systems , i f any . (iii ) Suc hpreconditionin g shall,include , a t a minimum , th e followin g steps : (A ) Th e caniste r (i f any ) shal l b e remove d fro mth e vehicl e an d purge d wit h300 ° F nitroge na t 2 0 liter s pe r minut e unti l th e incrementa l weigh t los s o f th e caniste r i s les s tha n1 gra mi n3 0 minutes . Thi s typicall ytake s 3- 4 hour s an d remove s 10 0 t o 12 0 gram s o f adsorbe d gasolin e vapors . (B ) Th e fue l tan k shal l b e draine d an d fille d t o capacit y wit hthe , ne wtes t fue l o r additive/fue l mixture . (C ) Th e vehicl e o r engin e shal l b e operate d unti l a t leas t 95 % o f th e fue l tan k capacit yi s consumed . (D ) Th e purge d caniste r shal l b e returne d t o th e vehicle . (E ) Th e fue l tan k shal l b e draine d an d fille d t o 40 % capacit y wit htes t fuel . (F ) Two-hou r fue l tan k hea t build s fro m72°-120 ° F shal l b e performe d repeatedl ya s necessar yt o achiev e caniste r breakthrough . Th e fue l tan k mus t b e draine d an d fille d prio r t o eac hhea t build .P.1 2

(e ) * * *

**** * (1)(i)(C ) Fo r Tie r 2 testing , th e engine s shal l operat e o n repeate d bag s 2 an d 3 o f th e UDD S o r bac k t o bac k repeat s o f th e heavy-dut ytransien t cycl e o f th e EDS . l(iii)(A ) I nth e cas e o f combustio nemission s generate d fro m light-dut yvehicles/engines , th e sample s consis t o f thre e bag s o f vapo r emission s (on e fro meac hsegmen t o f th e light-dut yexhaus t emissio ncycle ) plu s on e sampl e o f particulate-phas e emission s an d on e sampl e o f semi-volatile-phas e emission s (collecte d ove r al l segment s o f th e exhaus t emissio ncycle) . I f th e mas s o f particulat e emission s o r semi-volatil e emission s obtaine d durin g on e drivin g cycl e i s no t sufficien t fo r characterization , u p t o thre e drivin g cycle s ma yb e performe d an d th e extracte d fraction s combine d prio r t o chemica l analysis . Particulate-phas e emission s shal l no t b e combine d wit hsemi-volatile-phas e emissions . Th e tes t laborator yshoul d focu s o nth e characterizatio no f th e limi t o f detectio nfo r particulate s and semi-volatil e emissions . 12 . Sectio n79.5 7 i s als o propose d t o b e amende d byrevisin g paragraph s (e)(2)(i) , (e)(2)(ii) , (e)(2)(ii)(B) , (e)(2)(iii) , (e)(2)(iii)(C) , (e ) (2 ) (vi ) (B) , (e)(2 ) (vii) , (e ) (3 ) (i ) , (e)(3)(i)(A) , an d (f)(3) , t o rea d a s follows : (2 ) Generatin g whol e combustio nemission s fo r biologica l testing , (i ) Biologica l test s requirin g whol e combustio n emission s shal l b e conducte d usin g emission s generate d fro m th e tes t vehicl e o r engin e operate d i naccordanc e wit hgenera l FT P requirements . (ii),Light-dut ytes t vehicles/engine s shal l b e repeatedl y operate d ove r th e Urba nDynamomete r Drivin g Schedul e (UDDS ) (o r equivalen t engin e dynamomete r trace , pe r paragrap h(e ) (1 ) (i)'(A ) o f thi s section ) an d heavy-dut ytes t engine s shal l b e repeatedl y operate d ove r th e Engin e Dynamomete r Schedul e (EDS ) (se e 4 0 CF R par t 86 , appendi xI) . (ii)(B ) Th e UDD S o r ED S shal l b e repeate d a s man yti . _ s a s require d fo r th e biologica l tes t session . (iii ) A napparatu s t o integrat e th e larg e concentratio n swing s typica l o f transient-cycl e exhaus t i s t o b e use d betwee nth e sourc e o f emission s an d th e exposur e chambe r containin g th e anima l tes t cages(s) . Th e purpos e o f suc happaratu s i s t o decreas e th e 1 0variabilit yo f th e biologica l exposur e atmospher e an d achiev e th e necessaryconcentratio no f C O o r N0 X , whicheve r i s limiting . (iii)(C ) Th e mixing chambe r (o r an yalternativ e emissio n moderatio napparatus ) mus t functio nsuchtha t th e averag e concentratio no f tota l hydrocarbon s leaving th e apparatu s shal l b e withi n1 0 percen t o f th e averag e concentratio no f hydrocarbon s entering th e chamber , taking int o accoun t an yfurthe r intentiona l dilutio noccurring i nth e apparatu s pursuan t t o paragraph (e)(2)(iv)(C ) o f thi s section . **** * (vi)(B ) Thes e procedure s includ e requirement s tha t th e mea n exposur e concentratio ni nth e inhalatio ntes t chambe r shal l b e withi n 1 0 percen t o f th e targe t concentratio nfo r th e singl e specie s being controlle d (established i nth e developmen t phas e o f testing ) o n9 0 percen t o r mor e o f exposur e day s an d tha t dail y monitoring o f CO , C0 2 , N0 X , S0 X , an d tota l hydrocarbon s i nth e exposur e chambe r shal l b e required . Analysi s o f th e particl e siz e distributio nshal l als o b e performe d t o establishe d th e stabilit y an d consistencyo f particl e siz e distributio ni nth e tes t exposure . (vii ) T o allowfo r customarylaborator yscheduling an

d unforesee n problem s affecting th e combustio nemissio ngeneratio no r dilutio nequipment , biologica l exposure s mayb e interrupte d o n limite d occasions , a s specifie d i n§ 79.61(d)(5) . Interruption s exceeding thes e limitation s shal l caus e th e affecte d test(s ) t o b e void . Tester s shal l b e awar e o f concern s fo r backu p vehicles/engine s cite d i nparagraph(a)(7)(ii ) o f thi s section .

1 1(3 ) * * *

(i ) Salmonell a mutagenicit ytesting , pursuan t t o § 79.68 , shal l b e conducte d o nextract s o f th e particulat e an d semi-volatil e emissio nphase s separately . Thes e emission s shal l b e generate d b y operating th e tes t vehicle/engin e ove r th e appropriat e FT P driving schedul e .. .

(A ) Particulat e emission s shal l b e collecte d o nparticulat e filter s an

d extracte d fro

mth e collectio nequipmen t fo r us e i n biologica l tests . Th e numbe r o f repetition s o f th e applicabl e driving schedul e require d t o collec t sufficien t quantitie s o f th e particulat e emission s wil l vary , depending o nth e characteristic s o f th e engine , th e tes t fuel , an d th e requirement s o f th e biologica l tes t protocol . Th e particulat e sampl e mayb e collecte d o non e o r mor e filters , a s necessary .

(f ) * * *

**** * (3 ) Fo r biologica l testing , vapo r shal l b e withdraw nfro mth e EE Ga t a constan t rate , dilute d wit hai r a s require d fo r th e particula r study , an d conducte d immediatel yt o th e biologica l testing chamber(s ) i na manne r simila r t o th e metho d use d i n§ 79.57(e) , excluding th e mixing chambe r therein . Th e rat e of

emissio ngeneratio nshal l b e highenought o suppl yth e biologica l exposur e chambe r wit hsufficien t emission s t o allo wfo r a minimu m o f fiftee nai r change s pe r exposur e chambe r pe r hour . T o allo wfo r customarylaboratoryscheduling an d fo r unforesee nproblem s wit h th e evaporativ e emissio ngeneratio no r dilutio nequipment , biologica l exposure s mayb e interrupte d o nlimite d occasions , a s specifie d i n§ 79.61(d)(5) . Interruption s exceeding thes e limitation s shal l caus e th e affecte d test(s ) t o b e void .

1 213 . Sectio n79.5 8 i s propose d t o b e amende d b yrevising th e las t sentenc e o f paragraph(d)(1) , adding a sentenc e a t th e en d o f paragraph(d)(3) , an d b yadding a newparagraph(f ) , t o read a s follows : §79.5 8 Specia l provisions . (d ) Smal l Busines s Provisions . (1 ) Fo r purpose s o f thes e provisions ,

Tota l annua l sale s mean s th e averag e o f th e manufacturer' s tota l sale s revenue , excluding an yrevenu e whic hrepresent s th e collectio no f federal , state , and/o r loca l excis e taxe s and/o r sale s taxes , i neac ho f th e thre e year s prio r t o such manufacturer' s submitta l t o EP Ao f th e basi c registratio n informatio npursuan t t o § 79.59(b)(2)-(5 ) . (3 ) An yfue l manufacture r using a nadditiv e whic hi s no t require d t o mee t th e requirement s o f Tie r 2 pursuan t t o thi s paragraph , shal l als o no t b e require d t o mee t th e requirement s o f Tie r 2 wit hrespec t t o tha t additive . (f ) D e minimi s Provisions . (1 ) Th e manufacture r o f a n atypica l additiv e (pursuan t t o § 79.56 ) whic hmeet s th e criteri a i n paragraph(f ) (2 ) o f thi s section , o r th e manufacture r o f a fue l containing suc hanatypica l additive , i s no t require d t o mee t th e requirement s o f Tie r 2 (specified i n§ 79.53 ) i nregard t o suc h atypica l additiv e o r fue l product . Upo nsuc hmanufacturer' s satisfactorycompletio nan d submitta l t o EPAo f th e basi c registratio ndat a specifie d i n§ 79.59(b ) an d th e Tie r 1 informatio nspecifie d i n§ 79.5 2 fo r anatypica l fue l o r additive , th e manufacture r mayreques t an d EPAshal l issu e a registratio nfo r suc hproduct , subjec t t o £ 79.51(c ) an d paragraph(f ) (3 ) o f thi s section . Complianc e wit hTie r 1 requirement s unde r thi s paragraph mayb e accomplishe d b yth e individua l manufacture r o r a s a par t o f a grou p pursuan t t o § 79.56 . (2 ) Th e specia l prc/isio n describe d i nparagraph(f)( . > o f thi s sectio napplie s i nregard t o a natypica l additiv e (or a i-e l containing suc hadditive ) whic h(i ) contain s n o atypica l element(s ) othe r tha n aluminum , boron , calcium , iron , magnesium , phosphorus , potassium , sodium , and/o r zinc , an d (ii ) contain s thes e element s i n anamoun t suc hthat , whe nth e additiv e i s mixe d int o th e applicabl e bas e fue l a t th e highes t treatmen t rat e recommende d b yth e additiv e manufacturer , th e tota l o f thes e element s adde d t o th e bas e fue l doe s no t excee d 2 5 pp m(0.002 5 percent ) b yweight .

1 3P.1 6

(3 ) An yregistratio ngrante d b yEP Aunde r th e provision s o f thi s sectio nar e conditiona l upo nsatisfactorycompletio no f an y Tie r 3 requirement s whic hEP Amaysubsequentl yimpos e pursuan t t o § 79.54 . I nsuc hcircumstances , th e Tie r 3 requirement s migh t includ e (but woul d no t necessaril yb e limited to ) informatio nwhic h woul d otherwis e hav e bee nrequire d unde r th e provision s o f Tie r 2 . 14 . Sectio n79.5 9 i s propose d t o b e amende d b yadding a new sentenc e t o paragraph(b)((5)(ii ) t o read a s follows : § 79.5 9 Reportin

gRequirement s

**** * . (b)(5)(ii ) I f th e manufacture r claim s applicabilit yo f an y small.busines s provision s pursuan t t o § 79.58(d) , th e averag e o f th e manufacturer s tota l annua l sale s revenu e fo r th e previou s thre e year s shal l b e given . Upo nwritte nEP Arequest , th e manufacture r shal l suppl ysupporting documentation . 15 . Sectio n79.6 1 i s propose d t o b e amende d b yrevising paragraph (d)(5 ) t o read a s follows : § 79.6 1 Vehicl e emissions inhalatio nexposure guideline . **** * (d ) * * *

**** *

. (5 ) Exposur e Conditions . Th e preferre d exposur e regime n consist s o f exposing th e stud yanimal s t o th e tes t atmospher e o na repeate d basi s fo r a t leas t 6 hour s pe r da yo na 7-da

ype r wee k basi s fo r th e exposur e period . However , unles s preclude d b yth e requirement s o f a particula r tes t protocol , exposure s base d o na nomina l 5-day-per-wee k regime nwill , b e considere d acceptable , subjec t t o th e following rules : (i ) Eac hdail yexposur e during th e exposur e perio d mus t b e a t leas t 6 hour s plu s th e time necessaryt o buil d th e chambe r atmospher e t o 9 0 percen t o f th e targe t exposur e atmosphere . Aday i nwhic hthi s minimu mexposur e time ha s no t bee nachieve d doe s no t coun t a s a nexposur e iey . (ii ) Nominally , anima l exposure s shoul d b e conducte d fo r si x hour s pe r dayfo r five day s pe r week . I nn o cas e shoul d th e exposure s occu r les s tha nfour day s pe r wee k fo r a tota l o f 6 5 + 2 exposur e days . (iii ) N o mor e tha ntw o non-exposur e day s mayoccu r consecutivel yduring th e exposur e period , including day s o nwhic h th e minimu

m exposur e time ha s no t bee nmet . 1 4P.1 7

16 . Sectio n79.6 3 i s propose d t o b e amende d byinsertin g a ne w paragrap h(e)(4)(iii ) t o rea d a s follows : § 79.6 3 Fertilit y assessment/teratology .

* * * * * (e ) * * *

**** * (4 ) * * * (iii ) Pregnan t female s • shal l b e expose d t o th e tes t atmospher e o neac han d ever yda ybetwee n(an d including ) th e firs t and fifteent hda yo f gestation . 17 . Sectio n79.6 8 i s propose d t o b e amende d byrevisin g paragraph s (f)(1 ) an d (f)(5)(vi ) t o rea d a s follows : S 79.6 8 Salmonell a typhimuriu m revers e mutatio nassay .

**** * (f ) Dat a and repor t (1 ) Treatmen t o f results . Dat a shal l b e presente d a s numbe r o f revertan t colonie s pe r plate , revertant s pe r kilogra m (o r liter ) o f fuel , an d a s revertant s pe r kilomete r (o r mile , o r brake-horsepower/hour , a s appropriate ) fo r eac hreplicat e and dose . Thes e sam e measure s shal l b e recorde d o n bot hth e negativ e an d positiv e contro l plates . Th e mea nnumbe r o f revertan t colonie s pe r plate , revertant s pe r kilogra m(o r liter ) o f fuel , an d revertant s pe r kilomete r (o r mile , o r brake

horsepowe r /hour ) , a s wel l a s individua l plat e count s an d standar d deviation s shal l b e presente d fo r th e tes t substance , positiv e control , an d negativ e contro l p'.ates . (5 ) * * *

**** * (vi ) Individua l plat e counts , mea nnumbe r o f revertan t colonie s pe r plate , numbe r o f revertant s pe r kilomete r (o r mile , o r brake-horsepower/hour) , and standar d deviation ; an d

1 5