# ~ Chapter 9

### ---- STATE 

### OF MONTANA
--- 

### AIR QUALITY CONTROL**1~1)LE:v1ENTAT10N** 

### PLI\N

ATR QL'ALITY For tbe purposes of this subchapter: ( l) "Best available controi technology (8ACT)" means an emisston EmHation (including a visible .::nus standar, based on the ma:dmmn degree ofreduction for each pollutant subject to regulation under 42 G.S. l4 10, ct sc4
. or 7"5 L! 0 l. ct seq., MCA, that would be emitted from any proposed emitting unit or modificatio ·hich the cuse-by·case basis, wking into account energy, environmental. and economic i .tcts and other costs. determines is h:cvablc for such emitting unit or modificatiOn through application ofpro ction processes or iJV<Jilabk methods, sys ·, and techniques, inch1dmg fuel cleanmg or treatment or mno· tivc fltcl**combus~ion** tcchruqucs for control of s. h contaminant. In no event :nay app!Jcation of BAC ;esult m emission of any rcgu lakd air pollutant that wou exceed the emissions allowed by any appl1cablc andard under ARM Title !7
. chapter 8, subchapter 3, and this suo apt<:r. Ifthe dcparu11ent detcmrincs that t ; .ological or economic limitations on the application ofmeasurement mcth ology to a particular class ofemi · 1g umts would make the imposttion of on emission standard infeasible, it may instc rescribe a design, equi. .ent, workpractice, or operational standard or combination thereof, to require the app1tcat10; fDACT. Such s . dard must, to the degree poss1ble, set forth the emission reduction achievable by implementation o. ·uch desin , equipment, work practice or operation and must pro\'ld<: for compliance by means that achieve equivale ults. (2) "Construct'' or "construction" mc!udes a means : (<I) mitiarion of on-site fabncation , 1 of an emittmg umt or control equipment in<:luding, but not limited ro . (I) insw!latwn ofbuildmg su (til laying ofundcrgroun**_ip~work;** or (ui) construction of s ·age structures; or (h) the mstallatio f any portable or temporary equipment ()f faciiities. (1 i "Day" me· s calendar day unless other\l.ise stated. (4) "Enu g unit" means: (a) an ·quipment that emits or has the potential to emit any regulated <Jir pollutant under th of Moman· 1rough a stack(s) or venlf,s); or

,, ) any equipment from which emissions cons1st wlc\y of fus:tlvc emissions of a regulated ai1 po. th: Clean /\H ;\ct ofMontana
.

r \DMfN!ST RATJVE RGLES OF MONTr\NA 12/2!/9? !7.427

········--·············-----,

Page 9.2.2 7 (4)17
.8
.740 ENV!RONlvlENTAL QUALJTY

(e) eeflsU'ue!'iener dumbes ifl el"ere!:ieH !l! a fiteilit) or emitting tm:Jt tfl!lt 'tHlttiEi •• ie!are !lfl) eeHAitieH :A the fe.;i
. lit; 's Menttli'Ht !li.**~tutlity** t'etmit, Bn) aearcl er eemt erEier, any eeAa-ol**~Ian** ni!!tiA tl1e Menlana !iHHe**imr-leR~eH!!!!JeR** pltll'l, er !IAJ Rtie iH tlli!i ei'la)'ter, except as pro"ided in ARM 17
.8
.745 ;

ADMINlSTRATfVE RULES OF MONTANi \



### Paoe 9.2. 2.7 (5)

### AfR QUALITY 17.8.740 

### (9) "Montana air quality permit" means a 

### preconstruction permit issued under th. 

### su, · 1apter that may include requirements tor the construction 

### and subsequent operation , an cmitti

_ unit(s) or facility. 

### ( 1 "Negligible risk to the public health, safety, and welfare and to the er 

### ronment" means an inc ase in excess lifetime cancer risk of less than 

### 1.0 x 

### l

# o·6
, 

### for 1y individual pollutant, and I. 

### x 10·5
, 

### for the aggregate of 

### all pollutants, and an increas ·n the sum of the non-cancer hazard 

### q otients for 

### all pollutants with similar toxic effect· 

### of less 

### than 1.0, as dctennined by a 

### human ealth risk assessment conducted accordino o 

### ARM 17.8.767. The 

### department shall also cons1 , r environmental impacts identified 

### i ny environmental analysis conducted pursuant to the 

### rv1 tana Environmental Policy
. , Title 

### 75, chapter 

### 1, parts 

### l through 3, .\!1CA, 

### in determining mpliancc with all app · able rules or other requirements requinng 

### protection ofpubllc health, fcty, 

### and wclfar 

### and the environment. (11) 

### "New or modified emitting u ·t" 

### means· emitting unit that was not constructed or upon which construction ,.vas not commence to March 

### 16, 1979. 

### ( 12) "O,vner or operator" means the O\ · 

### ofa 

### facility or otherperson designated by the O\vner as responsible for overall operation the fa · ity. (13) 

### "Potential to emit" mean· 1e maximum apacity of a facility 

### or emitting umt, within physical and operational d · 

### tgn, to emit 

### a poilu nt. 

### Any physical or operational limitation on the capacity oft facility 

### or emitting unit to 

### ·mit 

### a pollutant, including air pollution control equipment · d restrictions on hours ofoperatio or on the ty'Pe 

### or amount of material combusted, store ., or processed, 

### is treated as part ofits 

### dcs1, only if

### the limitation or the 

### c!Tect it would ha · on emissions 

### is federally enforceable. Secon considered in detc
. ming potential to emit ( 14) 

### "J utine maintenance, repair, or replacement" means any actiO! aken upon an emitting un )y 

### the ow11er or operator that is necessary on a periodic basis to a ·ure proper opcratio ofthe emitting tmit. The tenn routine does not include activities that: (a) have associated fixed capital costs in excess of 

### 50% of the t!xed capita 

### w· essary to construct a comparable, entirely new· emitting unit;


### ADMINISTRATIVE .RULES OF MONTANA
. 12/31/02 17-429



### Page 9.2.2.7 

### (6)

### STATE OF MONTANA 

### AfR QUALITY CON_IB.D

## IMP~P~-~N

# I~ ENVIRONMENTAL QUALITY (D) change: design ofthe emitting unit, including associated control c (c) increase the p tial to emit ofthe emitting unit. rncnt; or ( 15) "Secondary cmiss1 " means emissions that would oc'
. sa result ofthe construction or operation ofa facili!y or emitting unit, c!liry or emining unit itself. Secondary emissions must be specific, \veil defined, qua**1:}~ble,_j)Zld"'frnpact** the same gem:ral area as the facility or**~m1tt1ng** unn which caus:.:s the secondary**erni~:>S~ondary** emissions may include, but arc not limited to:**~** (a) crnis5wns from trains ming to or from the facility v, ·mming unit ; (b) emissions fro ny off-site support facility that otherw1s ·vould not be constructed or I increase its emission·
.. a result ofthe constnJ(;tion or o ..pcra:ion ofthe faci liry o ' nitt1ng unit. (History 1 · 75-2-i I L 75-?

_ 4 , MCA; 

### TMP, 75-2-211, MCA; NEW, 2002 Jl..· lAR o 3567. Eff. -·'''710'2.)

# ~ l7.R.74i and

# ~;**·: 742**  reserved

- - - . . _

# ~'·--....- ..... ,..

# ,j 17.0_, ?43 l\1QNTANA _61.!3, 

### QlJAUTX PERMI1S H

- VlHEN**REOliU~:t:.D** (1) Except as provided in /\.RM 17.8
.744 and 17 8.745, a pcr:;on may not construct, install. modify, or operate any ofthe fol!owing without first obtaining a Montana air quality pcnnit issued bythe department: (a) a new facihty or crmning umt with the potenr1al to emit a1rbomc lead in an amount gn:atcr than five tons per year or a modification to an ex1stmg facility or cm1tting unit that results in an increase m the f:Jcilily or em itting unit's potential to l:mit airborne lead by an amount greater than 0
.6 tons per year; (b)**H~f'halt** eenetete plant::3, !'l'linere! ert·nlter:i, and mineral screens that have the potential to emit more than 15 tons per year ofany airbomepollutant, other than lead, that is**regu~atcd** under this chapter, (e) ttl'!)' ifleift.::, ater, as defi!'lecl ifl 75 2 I03(II). MCA, eftd that is**StJ~jeet** to tl'le**reqt~iremerHs** ef 75 2 215, MCA; {J) any facility oremining unit upon which construction comm<!nced, or that was installed, bcfurc November 23, 196R. when that facility or emining unit is mod1ticd after that date and the modiiicat:on mcrCU$CS the potential to emit by more than '25 tons pc.:r year ofany airbomcpollutant. other than lead. that JS regulated under this chapter; or

17

-430 •!2/3 :/03 ADMTl'-YlSTR..<\TIVE RULES OF**MO~TAN/\**17.8.763**ENVIRO:t\~ENTAL** 

### QUAUTY 

### 11,9,763 REVOCATION OF PERMIT (I) The department may revoke a Montan 1r quality p it or any portion ofa permit upon written request ofthe permittee, or for vi tion of any requirem of the Clean Air Act ofMontana, rules adopted under that , the Federal Clean Air Act an es promulgated Wlder that Act (as incorporated b ference in ARM 17 .8. 767), or any applica: e requirement contained in the Montana sta ·mplementation plan (as incorporated by reference in 17.8.767).
. (2) Thedepartmentshailn · thepermittecinwri · gofitsintenttorevokeapermitor a portion ofa permit. The department s department's decision to revoke a permit or a have elapsed after service ofthe notice un..l (3) When the department rev sa permit W1 his rule, the permittee may request a hearing before the board. A hea · g request must be in writ1 => • d must be filed with the board within 15 days after servic the department's notice ofintent t evoke the permit. Filing a request for a hearing ones the effective date ofthe department's de · ionuntil issuance ofa

. final decision b e board. (4 earing under this rule is governed by the contested case provisions o Adm· · trative Procedure Act, Title 2, chapter 4, part 6, MCA. (History: A; TMP, 75-2-211, MCA; NEW, 2002 MAR p. 3567, Eff. 12/27/02.) l7.8.764 ADMIN!STB,.ATIVE AMENDMENT TO PERMIT ( 1) The department may amend a Montana air quality permit, or any portion ofa permit, for the following reasons: (a) changes in any applicable rules adopted by the board; (b) changes in operation that do not result in an increase in emissions. The owner or operator of a facility may not increase the facility's emissions beyond permit limits unless the increase meets the criteria in ARM 17.8.745 for a de minimis change not requiring a pe1mit, or unless the owner or operator applies for and receives another permit in accordance 

### with ARM 17.8.748, 17.8.749, 17.8.752, 17.8.755, and 17.8.756, and with all applicable requirements in · ARM Title 17, chapter 8, subchapters 8, 9, and 10;AIR QUALITY 17
.8.765 (c) administrative errors in the permit that do not affect substantive provisions ofthe penn

### it. (2) Thedepartment shall notify the permittee in writing ofanyproposed amendments to the permit. The department shall serve the notice as provided for in ARM 17.8
.749. Thepennit is deemed amended in accordance with the notice when 1 5 days haveelapsed after service ofthe notice unless the permittee requests a hearing before the board. (3) When the department amends a permit under this rule, the permittee may request a hearingbefore the board. A hearing request mustbe in writing and must be filed with the board within 15 days after service ofthe department's notice ofinterlt to amend the permit. Filing a request for hearing postpones the effective date ofthe department's decision until issuance ofa final decision bythe board. (4) A hearingunderthis rule is governed bythecontested case provisions oftheMontana Administrative Procedure Act, Title 2, chapter 4, part 6, MCA. (History: 75-2-1 11, 75

-2

-204,
· MCA; IMP, 75-2-211, MCA;
. NEW, 2002 MAR p. 3567, Eff
. 12/27/02
.)

12"13 !102