UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y REGIO N 1 1 CONGRES S STREET , SUIT E 110 0 BOSTON , MASSACHUSETT S 02114-202 3



### Jun e 30 , 200 4 Rober t Donaldson Departmen

t o f Environmenta

l Protectio n Burea u o f Wast e Preventio n On e Winte r Stree t 8 t h

### Floo r Boston , M A 0210 8 Dea r Mr
. Donaldson : W e hav e reviewe dth

e Massachusett

s Departmen

t o f Environmenta

l Protection' s (DEP ) proposed amendment

s 31 0 Cod

e o f Massachusett

s Regulation s (CMR ) par t 7.00 , whic h wil l ad

d section s 7.26(40 ) through (44 ) to th e Ai r Pollutio n Contro l Regulations
. W e hav e include d ou

r comment s on th e propose d rul e fo r smaller-scal

e electri c generatin

g resource s i n th

e enclosur

e t o thi s letter
. W

e hav e concern s abou

t th e enforceabilit

y o f th e propose drule , bu t

hav e suggeste

d change s tha t woul daddres s ou

r concerns . I f yo u hav e an y questions , pleas e fee l free to contact Christin e Sansever

o o f my staf f a t (617 ) 918-1699
. Sincerely ,

Ann e Arnol d Actin g Manage

r Ai r Qualit y Plannin g Uni t
Enclosur e

Tol l Fre e •1-888-372-734 1 Interne t Addres s (URL ) • http://www.epa.gov/region 1 Recvcled/Recvclabl 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

EP A Regio n 1 Comment s - 31 0 CM R7.2

6 - Engine s an d Combustio n Turbine s Jun e 200 4 Proposa l Majo r Comment

s Subsection s 7.26(42)(e)(3)(a ) an d7.26(43)(e)(3)(a) authoriz e th e Departmen

t t o unilaterall y approve alternativ e tes t method s t o certif

y complianc e wit h emissio n limits
. I f Massachusetts intend s t o adopt thi s rul e int o the SI

P fo r enforceabl e emissio n reductions , thes e "directo r discretion " provision s mus t b e qualifie dt o ensur

e tha t an y such alternative s mus t

b e submitte dfo r

EPA approval
. T o addres s thes e concerns , w e recommen dthe followin g language change (change s i n caps) : "Tests t o certif y complianc e wit h emissio n limitation s mus t be performe di n accordanc e wit h EP A referenc e Methods , Californi aAi r Resource s Boar dMethod s APPROVE D B Y EPA , o r equivalent

method s a

s approvedb y the Departmen

t AN D EPA. "

• I n subsectio n 7.26(42)(b) , w e recommendtha t DEP referenc e EPA' s ne w standard s fo r nonroadengine s publishe d i n the Federa l Registe r o n Jun e 29 , 2004 (se

e 4 0 CF RPar t 89)
. Engine s buil t

i n mode l yea

r 200 8 an dbeyon dwil l have t o begi n meetin g thes e new , more stringent

standards
.

• I n 7.26(43)(b) , whic h addresses th e issu e o f atechnolog y review , w e recommendaddin g ane w sectio n (5 ) t o rea

da s follows : "AN Y REVISION S T O TH E EMISSION S LIMIT S I N TABLE S 2 AN D 3 SHAL L B E SUBMITTE D T O EP A FO RAPPROVAL. " We als o recommen d changin g "will " t o "shall " i n th e first sentence o f

7.26(43)(b)(2 ) an

d(3)
. Othe r Comment

s I n 7.26(40)(b) , fo r

clarification , w e suggest the followin g languag e chang e (i n caps) : "Engine s REGULATE D UNDE R4 0 CF R89 , 90 , 91 , and9 2 ar

e exempt fro mthe requirement s o f

31 0 CM R7.26(40 ) throug h (44 ) i n it s entirety. "

• T o clarif

y th e effectiv e date s o f

the sulfu r

limits , EP A recommend s the followin g languag e change (i n caps ) t o 7.02(8)(i)(5) , 7.05(l)(a)(3) , 7.03(10)(b) : "O n o r afte r [si x month s afte r

the effectiv e date] , n o perso n shal l accep t fo r delivery fo r

burnin g i n an

y engine s subjec t

t o 31 0 CM R7.02(8)(i) , diese l fue l tha t doe s no t mee t the applicabl e U.S
. Environmental Protectio n Agenc y sulfu r limit s fo r fue l pursuan

t t o 4 0 CF R80.2 9 a s PROMULGATE D Januar y 18 , 2001
. O N O RAFTE RJUN E 2006 , N O PERSO N SHAL L ACCEP T FO RDELIVER Y FO RBURNIN G I N AN Y ENGINE S SUBJEC T T O 31 0 CM R7.02(8)(i) , DIESE L FUE L THA T DOE S NO T MEE T TH E APPLICABL E U.S
. ENVIRONMENTA L PROTECTIO N AGENC Y SULFU RLIMIT S FO RFUE L PURSUAN T T O 4 0 CF

R80.500(a) , AN D 80.520(a) AN D (b ) A S PROMULGATE D JANUAR Y 18 , 2001. "

### Alternatively , i t ma y b e les s confusin

g t o simpl y stat e tha t th e sulfu r limi t o f 50 0 pp m mus t b e me t si x month s afte r th e effectiv e dat

e o f th e rule an d 1 5 pp mlimi t mus t b e me t beginnin g i n Jun e 2006
. I n 7.26(42)(e)(3)(b) an

d 7.26(43)(e)(3)(b) , EP

A recommend

s tha t th e tes t metho d referenc e IS O Method817 8 D2
. Th e D2 tes t i s th e bes t tes t fo r a n emergenc

y generato r becaus e i t i s aconstan

t spee d tes t (i t omit s idl e an d intermediat

e spee d modes)
. I n th e pre-ambl e t o th e rule , DE P i s seekin

g commen t o n allowing credi

t fo r Combine d Hea t an d Powe r (CHP ) systems . I f

DE P doe s decid e t o giv e credi t t o CH P systems , w

e recommen d tha t yo u adop t th e languag e i n th e Regulator

y Assistanc

e Projec t (RAP ) mode l rule
. I n orde

r gai n credit , th

e RA P rule require s facilitie s t

o demonstrat

e tha t a t leas t 2 0 percen t o f th e fuel' s tota

l recovere d energ y i s therma

l an d a t leas t 1 3 percen t i s electric
. I t also requires adesig

n syste mefficienc y o f

a t leas t 5 5 percent. I n addition , th

e RA P mode l ml e contains aformul afo r

calculatin g credit
.

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