UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y REGIO N 1 VST Y $ 1 CONGRES S STREET , SUIT E 1100 BOSTON , MASSACHUSETT S 02114-20 ; Octobe r 4 , 200 5 Rober t Donaldso n Departmen t o f Environmenta

l Protectio n Burea u o f Wast e Preventio

n On e Winte r Street , 8 t hFloo r Boston, M A 02108 Dea r Mr . Donaldson : Th e Massachusett

s Departmen

t o f Environmenta

l Protectio n i s currentl

y proposin g revisions t

o its ai r pollutio n control regulations , 31 0 CM R7.00,7.06 , an

d7.24 . EP A staf f hav e reviewe dth e propose d revision s an

dcomment

s ar e provide di n th e Enclosures . I f yo u hav e an y question s o n th e enclose d comments , pleas

e contac t Ann e Arnol do f

m y staf f a t 617-918-104

7 regardin g issue s associate d wit h th e revisions t

o 31 0 CM R7.0 0 an d7.24 , an d Aliso n Simco

x o f m y staf f a t 617-918-168

4 regardin g issue s associate d wit h th e revisions t

o 31 0 CM R7.06 , visibl e emission

s rule . Than k yo u fo r th e opportunit

y t o revie w thes e propose d revisions . Sincerely , 

# 33 ^ DavidB . Conroy , Chief

; Ai r Program s Branc h Enclosure s cc : Pau

l Reilly , M A DE

P

Tol l Fre e • 1-888-372-734 1 Interne t Addres s (URL ) • http://vww.epa.gov/region 1 Recycled/Recyclabl e • Printe d wit h Vegetabl e Oi l Base d Ink s o n Recycle d Pape r(Minimu m 30 % Postconsumer)Enclosur e 1 EP A COMMENT

S O N OCTOBE

R200 5 PROPOSE

D REVISION

S T O 31 0 CM R7.0 0 Massachusett

s i s proposin

g t o exemp t t-butyl acetat

e (TBAC ) fro mits definitio n o f th e ter m "volatil e organi

c compound " (VOC) . O

n Novembe

r 29,200 4 (6 9 F R69298) , EP

A als o mad e revisions t o it s VOC definitio n wit

h respec t t o TBAC . EPA' s rulemaking , however , differ s from Massachusetts ' proposal . EPA' s rulemakin g exempt s TBA C fro mth e definitio n o f

VO C fo r purpose s o f VO C emissio n limitation s an

d VO C conten t requirement

s bu t retains recordkeepin

g an d reportin g requirement

s fo r TBAC . Therefore , Massachusett s shoul d delet e th e propose d referenc e t o t-butyl acetat

e i n it s lis t o f exemp t compound

s an d instea d ad d th e followin g provision , consisten

t wit h 4 0 CF R51.100(s) , t

o its VO C definition : "I n addition , th

e followin g compound(s

) ar e VO C fo r purpose s o f al l recordkeeping , emission s reporting , photochemica

l modelin g an d inventor y requirement

s whic h appl y t o VOC an d shal l b e uniquel y identifie di n emissio

n report s bu t ar e no t VO C fo r purpose s o f VOC emission

s limitation s o

r VO C conten t requirements : t-butvl acetate. " Furthermore , th

e CA S (Chemica

l Abstract s Service ) Numbe r o f tw o o f th e chemical

s o n Massachusetts ' lis t

o f exemp t compound

s shoul d b e revise d t o rea d a s follows : 12438 9 carbo

n dioxid e 42046 2 HFC-143 a(1,1,1,

- trifluoroethane)Enclosur e 2 EP A COMMENT

S O N OCTOBE

R200 5 PROPOSE

D REVISION

S T O 31 0 CM R7.0 6 1 . Massachusetts ' propose

d revisio n t o sectio n 1 .a , 1 .b , an d1 . c unde

r 31 0 CM R7.06(1 ) (c ) (exceptio n t o visibl e emissio

n limits ) i s i n accordanc

e wit h revisions suggeste

d b y EP A i n Januar y 2005 . W

e suppor t th e propose d languag e i n 31 0 CM

R7.06( 1 )(c ) 1 .b „ which onl y allow s visibl e emission

s t o excee d 2 7 percen t opacit y durin g on e hou r pe r quarte r calenda r year . W e agre e wit h th e Stat e tha t specifyin g athreshol

dfo r averag e opacit y durin g thi s hou r would complicat e th e typ e o f continuous monitorin

g equipmen

t required . 2 . I t appear s ther e i s atypographica

l erro r i n 31 0 CM

R7.06(l)(c)l.a . I t

shoul drea d a s follows : a . Excep t a s provide di n 31 0 CM

R7.06(l)(c)l.b. ; 31 0 CM

R7.06(l)(c)l.c . an

d31 0 CM R 7.06(l)(c)l.g . below , visibl e emission s shal l no t excee d 1 5 percen

t opacit y durin g an y 6
- minut e bloc k average. 3 . Unde r 31 0 CM R7.06(l)(c)l.g. , M A DE

P ma y allow exemption

s t o l.a , Lb , an

dl. c i f a facility notifie s th

e departmen

t a t leas t two busines s day

s befor e schedule d shakedow

n activities , testing , an dcalibration s fo r

th e purpos e o f improvin g boile r performance . I n addition , M A DE P ma y allo w ashorte

r notificatio n perio

dupo n request . A s thes e activitie s ar

e "scheduled, " an

dno t i n respons e t o emergenc

y conditions , two day

s notic e ma y no t giv e th e M A DE P adequat e tim e t o full y asses

s whethe r exemptio n t o visible emissio

n limit s i s appropriate . W

e recommen

d tha t th e M A DE P requir e writte n notificatio n a

t leas t fiv e business day

s i n advanc

e o f activitie s intende dt o improv e boile r performance .Enclosur e 3 EP A COMMENT

S O N OCTOBE

R200 5 PROPOSE

D REVISION

S T O 31 0 CM R7.2 4 Massachusett

s i s proposin

g t o revise th e 31 0 CM R7.24(4)(a)(l ) requiremen t tha t atan k truc k b e teste d annuall y durin g th e month s o f Januar y throug h Jun e t o instea d requir e tha t th e tan k truc k "wa s teste d withi n th

e 1 2 precedin

g months. " Th

e backgroun

ddocumen

t fo r thi s rulemakin

g state s tha t thi s revisio

n i s bein g mad e t o mak e Massachusetts ' requirement s consisten

t wit h 4 0 CF RPar t 6 3 Subpar t Ran dt o provid e greate r flexibility i n schedulin

g testin g t o assur e ther e ar e sufficien t truck s availabl e t o delive r fuel . Thi s i s reasonable

, however , 31 0 CM R 7.24(4)(a)(4)(b) , whic

h state s tha t th e certificatio n "shal

l expir e Jul y 1 o f th e yea r followin g th

e test, " i s inconsisten

t wit h th e 1 2 mont h requiremen

t an dth e state d goa l o f spreadin g ou t th e testing . Therefore , 31 0 CM R7.24(4)(a)(4)(b) shoul

db e revise dt o rea d a s follows : "shal l expir e no t mor e tha n 1 2 month

s afte r th e dat e th e tan k truc k las t passe d th e test. "