# CIT Y O F BOSTO N

TH E ENVIRONMEN T DEPARTMEN T BostonCit

y Hall , Roo

m80 5 • Boston , M A0220 1 • 617/635-385 0 • FAX : 617/635-343 5

Jun e 30 , 200 4 Departmen t o fEnvironmenta l Protectio n Burea u o fWast e Preventio n On e Winte rStree t 8 t h Floo r Boston , M A0210 8 Attn : Robert Donaldso n Dea rMr
. Donaldson : Th e Cit yo fBosto n Ai rPollutio n Contro l Commissio n (APCC ) ha s reviewe d th e propose d addition s an d revision s t o th e Commonwealth' s Ai rPollutio n Contro l Regulation s - 31 0 CM R 7.02(40 ) throug h (44) , whic h regulat e emission s fro m ne wstationaryengine s an d combustio n turbines ; 31 0 CM R 7.02(8)(i ) an d 31 0 CM R 7.03(10 ) fo rexistin g engines ; 31 0 CM R 7.0 2 Pla n Approva l Emissio n Limitations ; 31 0 CM R 7.0 5 Fuels , an d 31 0 CM R 70.0 0 Environmenta l Result s Progra m Certificatio n Regulations
. Th e propose d revision s wil l affec t stationaryengine s an d turbine s use d a s emergenc yan d non emergenc ypowe rsources . Th e Departmen t ha s indicate d tha t th e ne wrule s ar e necessaryt o bette rregulat e th e increasin g numbe ro fdiese l stationaryengine s i n th e state , man yo fwhic h ar e smalle rtha n th e curren t permittin g threshold
. Th e Departmen t als o wishe s t o streamlin e permittin g b yexpandin g th e us e o fEnvironmenta l Result s Progra m (ERP ) tool s i n th e oversigh t o fsuc h engines
. Th e genera l requirement s fo rne wstationaryengine s an d turbine s include : •Rathe rtha n existin g case-by-cas e permi t revie wfo runits , owner s o fne wunit s wil l b e require d t o certif ycomplianc e wit h al l ne wstandard s an d requirements , whic h wil l includ e a manufacturer s certificat e o femission s performance
. •Exception s t o certificatio n fo runi t operation s tha t hav e specifi ctechnica l o reconomi c considerations , suc h a s turbine s tha t operat e a s peakin g powe rproductio n units
. Thes e unit s ma yb e file d unde rth e traditiona l case-by-cas e revie wprocess , an d DE P wil l requir e Bes t Availabl e Contro l Technologie s (BACT)
. •Al l ne wliqui d fuele d engine s wil l b e require d t o bur n ULS D whe n i t i s require d an d become s availabl e fo ro n roa d vehicle s i n 2006
. • Ne wemergenc yan d non-emergenc yturbine s wil l b e require d t o compl ywit h emissio n standard s base d o n DEP' s evaluatio n o fvendo rinformatio n an d agencydetermination s ofBACT
. • Requirement s fo rstac k height/emissio n dispersion , noise , operatio n an d maintenanc e recor d keeping , monitorin g an d visibl e emission s ar e propose d fo ral l ne wengin e an d turbin e installations
. • Ne wemergenc yengine s rate d a t 3 7 k wan d greate ran d emergenc yturbine s rate d a t les s tha n 1 M Wwil l b e require d t o compl ywit h emissio n standard s base d o n EPA' s non roa d engin e progra m an d th e threshol d fo rregulatio n i s bein g lowere d fro m 30 0 k wt o 3 7 kw
. • Ne wnon-emergenc yengine s rate d greate rtha n 5 0 k wan d les s tha n o requa l t o 10M W unit s wil l requir e manufacture rcertificatio n base d o n standard s se t fo ri n th e Regulatory Assistanc e Project (RAP ) Mode l Rul e fo rth e Outpu t Specifie d Ai rEmission s fro m



### Antoni aM . Pollak , Director Printe d o n recycle d pape r 

### Thoma s M . Menino , MayorPropose d Amendment s t o 31 0 CM R 7.0 0 an d 31 0 CM R 70.0 0 - APC C comment s 2 Smaller-Scal e Electri cGeneratio n Resources , whic h phase s i n increasingl ystringen t standard s betwee n 200 4 an d 2012
. Th e APC C support s th e propose d amendment s a s the ywil l mor e comprehensivel yregulat e stationaryemissio n sources . Th e Cityo fBosto n ha s man yfacilitie s withi n th e cit ytha t emplo y emergenc ygenerator s an d i t i s anticipate d tha t distribute d generatio n an d Combine d Hea t an d Powe r(CHP ) system s wil l gro wi n numbe ri n th e city , a s thes e facilitie s provid e fo renerg y savings , reduce d emission s an d th e expansio n o fcleane rburnin g fuels
. Give n th e concentratio n o fthes e unit s i n th e city , alon g wit h othe rstationaryan d mobil e source s o fai rpollution , i t i s importan t t o hav e thes e unit s adequatel yregulate d b yDEP
. Th e DE P mus t provid e sufficient staf fan d oversigh t o fth e Environmenta l Result s Progra m tool s a s the yappl yt o thes e generators , t o ensur e tha t emission s standard s ar e adhere d t o an d ULS D i s i n use . Furthermore , DE P mus t ensur e tha t non-emergencyengine s an d turbine s system s no t subjec t t o ER P tha t underg o traditiona l review , b e require d t o implemen t Bes t Availabl e Contro l Technologie s t o limi t pollutan t levels
. Thes e unit s wil l b e utilize d durin g pea k period s an d wil l b e employed , o n ho t summerday s whe n fossi l fue l combustio n emission s level s an d weathe r condition s creat e poo rai rquality
. Thes e generator s shoul d mee t th e mos t stringen t standards
. Th e APC C support s DEP' s positio n o fno t allowin g emissio n credit s agains t emissio n limitation s fo rCH P unit s a s suggeste d i n RA P Mode l Rule
. As note d i n th e Backgroun d Informatio n Document , thi s methodolog ywil l allo wfo rth e installatio n o funit s tha t ma yexcee d limitations , hinderin g th e implementatio n o fBAC Tstat e o fth e art engine s an d turbines
. Incentive s fo rCH P shoul d no t compromis e existin g ai rqualit ystandard s an d regulations
. Th e propose d amendment s t o 31 0 CM R 7.02(8)(i) , 31 0 CM R 7.03(10) , an d 31 0 CM R 7.26(41) , outlin e limit s upo n engin e operations , specifyin g th e condition s unde rwhic h engine s ma yoperat e withi n th e 30 0 hours , pe rrollin g 1 2 mont h period
. Th e DE P shoul d bette rdefin e "imminent " i n referenc e t o threat s o fpowe routages . Th e APC C ha s concer n tha t generator s may unnecessaril yb e brough t o n lin e t o supplemen t energ yus e o n heavyloa d day s durin g summe r month s whe n ai rqualit yi s alread ycompromised
. Th e APC C support s furthe rmeasure s t o contro l ai rpollutan t level s fro m al l ne wan d existin g stationaryengine s an d combustio n turbine s throug h th e installatio n o femissio n contro l technologie s suc h Diese l Oxidatio n Catalysts
. Th e DE P shoul d conside rrequirement s fo rthes e technologie s fo rolder , dirtie rgenerator s t o supplemen t th e improvement s brough t b yus e o f ULSD
. Additionally , th e amendment s shoul d no t preclud e th e us e o fcleaner , alternativ e fuel s suc h a s biodiesel
. Th e ER P tool s shoul d als o accoun t fo runit s tha t hav e additiona l contro l technologie s an d utiliz e alternativ e fuels
. W e than k

yo u fo rth e opportunit yt o comment .

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