RJ07. Environmental Quality, Air Quality. 

R307-3 I 2. Aggrcgatr Processing Operations for PM2.5 

Nonattainment Areas. 

R307-312-J. Purpose. 

RJ07-3 I 2 eqablishes emission standards for source;, 

in the aggregate processing industry, includmg aggregate 

processing cquipmenL hot mix :L~phalt plants, and concrer.c 

batch plants. 

RJ07-312-2. Applicability. 

( l) R307-3 I 2 applies to all crushers. screens, 

conwyors, hot mix a:sphalt plants. and concrete batch plants 

located within .i Plvl2.5 nonattaimncnt and maintenance area us 

defined in 40 CTR 81.345 (July l. 2011) and geographically 

described as all regions of Salt Lake and Davis coumie~ : all 

portions of th.: Cm:he Valley: all r<:gions in Weber and lJt.1h 

counties west of' the \Vasatch mountuin range; in Box Elder 

County. from the Wasatch mountain range west to the 

Promontory mountain range and south of Portage; and in 

Tooele County, from the northernmost pai1 of the Oqu.irrh 

mountain range to the northern most part of the Stiuisbury 

mountain range and north of Route 199. 

(2) T11c provisions of R307-3 I 2 do not apply to 

temporary bot mix asphalt plants. 

R307-312-3. Definition~. 

The following definitions apply to R307-3 l 2: 

"Aggregate" means material of which the majority is 

nomnctal lie minerals. 

"Concrete batch plant" means any facility used to 

manufacture concrdc hy mixing aggregate with cement. 

"Conveyor" means a device !Or lrnn~porting 

nonmetallic materials from one piece of equipment to unother 

'"Crusher"' means a machine used to crush any 

nonmetallic mim:rnls. 

"Hot mix asphalt plant'' means any facility used to 

manufacture bot mix asphalt by heatmg and drying aggregate 

and mixing with asphalt cement>. 

"Nonmetallic mineral" has the same definition as 

defined in 40 Cf'R 60.671. 

"Screen" means a device for s.:parating nonmetallic 

mincr:ils according to size by passing undersize material 

through one or more rnesh surla\:es in series. and retain ing 

ovcrsi:re material on the m.::sh sur!ilccs. 

"Temporary" means not more than i 80 operating 

days and not more than 365 calendar diiys. 

R307-312-4. Visible Emissions. 

(I) Visible emissions from :;ource~ subj.:cl to RJ07-

3 l 2 shall not exceed the opacity limits as specified in Table I. 

CA1CORY 

( 1""JS re r> 

Scree•1s Coriv-eyor trar,sf~r po1nts 

Co11crete ba tch pla nts 

TA8L[ 1 

(2) Opacity Ob'icrvation. 

OPAC! ' Y UH!! 

12>. 

/% 

7% 

(a) Opacity ubservalions of em1sswns shall he 

c·onductcd according to 40 CFR 60, Appendix A, Method 9. 

(b) 111e duration of the Method 9 observations shall 

be 30 minutes (five six-mi nute averages). 

(cl Compliance shall be based on the average of the 

live six-minute averages. The duration of Method 9 may be 

reduced to 6 minutes (one six-minute average) if the first sixminute average is below the limit specified in ·1 abk I. 

R307-312-S. Hot Mix Asphalt Plants. 

(I) 'Ilic filterable P\·12.5 emission rate from a hot 

mix asphalt plant dryer shall not exceed 0.024 grains per dscf. 

(a) Fillcmble PM2.5 emissions shall be detennined 

by 40 CFR 51, Appendix M, Method 20 1 A. 

(2) From November I lo March I, a hot mix asphalt 

plant burning a fuel other than natural gas or liquefied 

petroleum gas (LPG) shall not produce more than 50'Vo of its 

rated capacity. 

(a) Production shall be detennined by scale house 

records or equivalent method on a daily basis. 

(b) Compliance shall be based on either the daily 

amount of hot mix asphalt produced averaged over the 

operating day or the daily amount of hot mix asphalt produced 

while burning a fuel other than natural gas or LPG averaged 

over the time the plant is operating while burning a fuel other 

than natural ga~ or LPG each day. 

(c) Compliance shall be determined by production 

r~cords and fuel records. 

R307-312-6. Compliance Schedule. 

(l) All sources su bject to R307-3 12-4 or R307-312-

5(2'l shall be in compliance with this rule by June?, 2013. 

(2) All sources subject to RJ07-3 l 2-5(1) that begin 

C'onstruction prior to .lune ?. 2013. shall suhmit test results 

demon,1rating compliance with R307-312-5(1) to the director 

b~' December 14, 2015. 

(3) All sources subject to R307-3t2-5(1) that begin 

constrnction on or after June 7. 2013, shall submit test results 

demonstrating compliance with R307-312-5(1) to the director 

no later than 180 days after initial sta11up. 

KEY: air pollution, aggregate, asphalt, concrete 

Date of Enactment or Last Substantive Amendment: 

February I, 2013 

Authorizing, and lmplcmcntcd or Interpreted Law: 19-2-

101: 19-2-104; 19-2-109 

E - 26 

Conditionally 

approved