DEPARTMENT OF PUBLIC 

HEALTH AND ENVIRONMENT 

AIR QUALITY CONTROL. COMMISSION 

REGULATION NUMBER 7 

CONTROL OF OZONE VIA OZONE PRECURSORS 

(EMISSIONS OF VOLATILE ORGANIC COMPOUNDS AND 

NITROGEN OXIDES) 

5 CCR 1001-9 

EDITOR'S NOTES* 

Authority Cited: 

§§ 25-7-105(1)(a), (b), -1.06(1)(c), (5), (6), -109(l)(a), (2), C.R.S. 

History and Amendments: 

Amended 09111n7, 1 CR 1. Repealed and readopted 12/14n8, 2 CR 1. Pp. 1-37 adopted 05(22180, 

EFFECTIVE 05130/80, 3 CR 6. Pp. 1-77 adopted 12104/80, EFFECTIVE 01130/81,4 CR 1. Pp. 13-14 adopted 

04/09/81, EFFECTIVE 06/01/81, 4 CR 5. Pp. 1-83 adopted 09f20/89, EFFECTIVE 10130/89, 1Z CR 10. Pp. 1-

88 adopted 07/19/90, EFFEC11VE 08130190, 13 CR 8. Pp. 1-90 adopted t 1/19192, EFFECTIVE 12130/92,15 

CR 12. Pp. 1-433 adopted 06124/93, EFFECTIVE 08130/93, 16 CR 8. Pp. 7-8 adopted 10/20194, EFFECTIVE 

12130/94, 17 CR 12. Pp. 1-92 adopted 02116195, EFFECTIVE 04130/95,18 CR 4. Pp. 7-8 adopted 03/16/95, 

EFFECTIVE 05130/95,18 CR 5. Pp. 45-46 adopted 05/18/95, EFFECTIVE 07130/95, 18 CR 7. Pp. 4-5, 81-

81.02 adopted 12/21/95, EFFECTIVE 03/01196,19 CR 2. Pp. 1-1.02, 7-8, 81.02-82 adopted 03f21/96, 

EFFECTIVE 05130/96,19 CR 5. Pp. 71, 74,81.07-81.08 adopted 11/21/96, EFFECTIVE 01130197,20 CR 1. 

Pp. 7.01-7.03, 81.08-81.12 adopted 10/15/98, EFFECTIVE 11130/98,21 CR 11. Pp. 1-97 adopted 01/11101, 

EFFECTIVE 03/02101, 24 CR 2. Sections I.A.2 to l.A.4, Il.E adopted 11/19103, EFFECTIVE 02/02104,27 CR 

1. Sections I.A, I.B, XII, XVI adopted 03/12104 (entire rule replaced with pp. i-92), EFFECTIVE 05/30/04,27 

. CR 5. Pp. I, 4, 4.1, 67-88.4, 92-104 adopted 12/16/04, EFFECTIVE 03/02/05,28 CR l. Technical correction to 

add two missing pages {now pp. 88.3-88.4), 28 CR 3. Rule XII.A.5.d amended by technical correction, and top 

of page 71 corrected due to publishing error, 28 CR 6. 

A.G. Opinions: 

I AG 57; 2 AG 15; 3 AG 147; 4 AG 29; 4 AG 99; 12 AG 343; 13 AG 249; 15 AG 509; 16 AG 277; 17 AG 481; 

18 AG 142; 18 AG 181; 18 AG 2S3; 19 AG 53; 19 AG 127; 20 AG 19; 21 AG 350; 24 AG 59; 27 AG 47; 27 

AG 171; 28 AG 43; 

Annotations: . 

Rules VI. D. 3. c., IX. A. 8. c., IX. A. 10. b., IX. N. 3. a., XII. D. 1. c., XIII. C.- D., XV. B. I. b., adopted after 

January 1, 1992 and before January I, 1993 were not extended by H.B. 93-1131 and therefore expired June 1, 

1993. 

-nus Title Paac doca not constitute an official part of any regulation. Information contained on the Ti\le Page is provided by the Publlsher 

from~ dccrocd reliable IJild is solely for informational and hiSIOJical purpoacs. Sec caulionll}' noce ill lnlroduclory Materials, How to 

UsclheCCR.. 

C 20 II Sial& of Colo .-.do 

All Rights Reserved. (BOO) 833-9844 
EDITOR'S NOTES (continued) 

· History aud Ameadmea.ts: 

Rules J.A.J.b, XII, and :XVII adopted 12117/06, EFFECTIVE 03/04/07, 30 CR 2. Rules XII.A.4.d.iii and 

XII.A.4.d.iv amended by technical correction, 31 CR 1. Rule replaced in its entirety, adopted 12/12108, 

EFFECTIVE 01/30/09, 32 CR 1. Rules II.C.I, XII .A. I .a, XII.D.2.a, XO.G, XD.G.3, Xll.G.4, XO.H, XVJI, 

XVII.E.2.b (table) amended by technical correction, 32 CR 12. Rules I.A. I .c., XVII., XIX.L. [TN 2010..00857] 

adopted Ol/07/1 J, EFFECTIVE 02/14/1 I, 34 CR 2. 

A.G. Opinion1: 

30 AG Feb 1001-9; 32 AG J~ 1001-9; 34 AG Jari 1001·9 

Annotatious: 

6 CCR 1001-9 Page2 
I. 

II. 

Ill. 

IV. 

V. 

VI. 

vn. 

vm. 

IX. 

X. 

XI. 

xn. 

xm. 

XIV. 

XV. 

XVI. 

XVII. 

XVlll. 

XIX. 

Appendix A 

Appendix B 

Appendix C 

Appendix D 

Appendix E 

AppendixF 

34 CR 1 and 2, 01·11 

TABLE OF CONTENTS 

Applicability ....................................................................................................................... , ...... 1 

General Provisions ..................................................................................................................... 3 

General Requirements for Storage and Transfer of Volatile Organic Compounds .................... 7 

Storage of Highly Volatile Organic Compounds ...................................................................... .-8 

Disposal of Volatile Organic Compounds ................................................................................. 8 

Storage and Transfer of Petroleum Liquid ................................................................................. 8 

Crude Oil ................................................................................................................................. 22 

Petroleum Processing and Refining ......................................................................................... 23 

Surface Coating Operations ..................................................................................................... 30 

Usc of Solvents for Degrea.sing and Cleaning ......................................................................... 49 

Usc of Cutback Asphalt ........................................................................................................... 55 

Vol.atile Organic Compound Emissions from Oil and Gas Operations .................................... 56 

Graphic Arts ............................................................................................................................. 70 

Phannaceutical Synthesis ....... .' ....................................................... , ......................................... 72 

Control of Volatile Organic Compound Leaks from Vapor Collection Systems 

and Vapor Control Systems Located at Gasoline Terminals, Gasoline Bulk 

Plants, and Gasoline Dispensing Facilities ....................................................................... 74 

Control of Emissions from Stationary and Portable Engines in the 8-Hour Omne 

Control Area ..................................................................................................................... 76 

(State Only, except Section XVII.E.3.a. which was submitted as part of the 

Regional Haze SIP) Statewide Controls for Oil and Gas Operations and 

Natural Gas-Fired Reciprocating Internal Combustion Engines ....................................... 77 

(State Only) Natural Gas-Actuated Pneumatic Controllers Associated with Oil 

and Gas Operations ........................................................................................................... 81 

Statements of Basis, Specific Statutory Authority and Purpose .............................................. 83 

Colorado Ozone Nonattainment or Attainment Maintenance Areas ...................................... IOS 

Criteria for Control of Vapors from Gasolin~ Transfer to Storage Tanks .............................. I06 

Criteria for Control ofVapors From Gasoline Transfer at Bulk Plants (Vapor 

Balance System) ............................................................................................................. 1 08 

Minimwn Cooling Capacities for Refrigerated Freeboard Chillers on Vapor 

Degreasers ....................................................................................................................... 11 0 

Test Procedures for Annual Pressure!Vacuwn Testing of Gasoline Transport 

Tanks .............................................................................................................................. 111 

Emission Limit Conversion Procedure ..................................................................... ; ............ 114 

0 2011 SUI&c of Colondo 5 CCR 1001-9 

All Rlshts Reserved. (800) 833-9844 
C 20 I I State of Colorado 

All R.ia)u.s Reserved 

34 CR 1 and 2, 01-11 Page 77 

XVI.C.4Any lean bum reciprocating internal combustion engine operating in the 8-hour 

Ozone Control Area prior to June 1, 2004, for which the owner or operator demo • 

strates to the Division that retrofit technology cannot be installed at a cost of le than 

$ 5,000 per ton of VOC emission reduction. Installation costs and the best in rmation available for determining control efficiency shall be considered in deter ning 

such costs. In order to qualify for such exemption, the owner or operator usl submit 

an application making such a demonstration, together with all supportin ocuments, 

to the Division by May 1, 2005. Any reciprocating internal combustion ngine qualifyIng for this exemption shall not be moved to any other location Within e 8-hour 

one Control Area. 

XVII. (State Onl except Section XVII.E.3.a. which was submitted as part f the Regional 

Haze SIP) S tewlde Controls for Oil and Gas Operations and Nat I Gas-Fired Reciprocating In al Combustion Engines 

Xvii.A.1 "Air ollullon Control Equipment,• as lised in 

combustion d Ice or vapor recovery unit. Air pollutl control equipment also 

means altemati emissions control equipment a ollulion prevention deVices and 

processes Intend to reduce uncontrolled actual missions that comply with the requirements of Sec n XVII.B.2. · 

XVII.A.2. "Atmospheric, when used to modify e term "condensate storage lank", 

means a type of conde ate storage tank t t vents, or is designed to vent, to the 

atmosphere. 

ans any production tank or series of producthat store condensate. 

XVII.A.4 "Glycol Natural Gas Oeh rator" ·means any device in which a liquid glycol 

(including ethylene glycol, dielh 

contacts a natural gas stream 

XVII.B. (Stale Only) General Provisions 

XVII.B.1. · General require 

kage, and flares and 

XVII.B.1.a. All r pollution control equipm t required by this Section XVII shall 

be operal and maintained pursuant to anufacturer specifications or 

equivale t to the extent practicable, and sistent with technological limitations a ~ good engineering and maintenan practices. The owner or operator II keep manufacturer specifications ore uivalenl on file. In addition, 

all ch air pollution control equipment shall be dequately designed and 

s ad to achieve the control efficiency rates requl d by this Section XVII and 

handle reasonably foreseeable fluctuations In e · ions of volatile organic 

compounds during normal operations. Fluctuations 1 emissions that occur 

when the separator dumps Into the lank are reasonab foreseeable . 

. B.1.b. All condensate collection, storage, processing an handling operalions, regardless of size, shall be designed, operated and intained so as 

to minimiZe leakage of volatile organic compounds to the at sphere to the 

extent reasonably practicable. 

XVII.B.1.c. If a flare or other combustion device is used to control e slons of 

volatile organic compounds to comply with Section XVII, it shall be nclosed, 

have no visible emissions during normal operations, and be design so than 

an observer can, by means of visual observation from the outside oft 

CODE OF COLORADO REGULATIONS . 6 CCR 1001-9 
Page 78 

closed flare or combustion device, or by other convenient means appro 

by the Division, determine whether it Is operating properly. 

XVII.B.1.d. Any of the effective dates for installation of controls on conde sate 

tanks dehydrators and/or internal cOmbustion engines may be exte ed at 

the air pollution control Division's discretion for good cause sh 

.2. Alternative emissions control equipment shall qualify as air poll on control 

equipment, and may be used in lieu of, or in. combination with, combu ion devices 

d vapor recovery units to achieve the emission reductions requl by this Section 

I, if the Division approves the equipment, device or process part of the appro I process the Division, at Its discretion, may specify a diffe t control effaclency 

than control efficiencies required by this Section XVII. 

XVII.B.3. 

XVII.B.4. Co densate tanks, dehydrators and Internal co stlon engines that are 

subject to an missions control requirement In a federa maximum achievable control 

technology(" Cr) standard under 40 CFR Part 63 a Best Available Control Technology ("BACT" imit, or a New Source Performan Standard und~r 40 CFR Part 60 

~;~re not subject to is Section XVII. 

XVII. C. (State Only) Emission reduct n from condensate store e tanks at oil and gas exploration 

and production operations, na al gas compressor s ions, natural gas drip stations and 

natural gas processing plants. 

operators of all atmospheric condensate 

lsslons of volatile organic compounds equal 

on a rolling twelve-month total shall operate 

s an average control efficiency of at least 95% 

XVII.C.2. For condensate stora tan with past, uncontrolled actual emissions of volatile organic compounds of s than tons per year based on a rolling twelvemonth total that may beco subject to action XVJI.C.1. by virtue of the addition of 

a newly drilled well or the completion or timulation of an existini well, owners or 

operators of such tanks all have untU 90 ys after the date of 1 productlon·of the 

newly drilled, recompl ed or stimulated weH Install and operate any required air 

pollution control equ rnent. If the owner or op ator determines that emissions of volatile organic com nds will be below the 20 to year threshold, the owner or 

operator shall no the Division of this determine n in writing and Include an explanation of the m odology used to make this dete · ation. 

XVII.C.3. Mon ring: The owner or operator of any con nsate storage tank that is re6 CCR 1001-9 

quired to trol volatile organic compound emissions p uant to this Section 

XVII.C. s II visually inspect or monitor the Air Pollution trol Equipment to ensure 

that it Is perating·at least as often as condensate Is load ut from the tank, unless 

a mor frequent Inspection or monitoring schedule is follow In addition, If a flare 

or o r combustion device is used, the owner or operator sha ·sually inspect the 

de ce for visible emissions at least as often as condensate is I ad out from the 

k. 

. Recordkeeping: The owner or operator of each condensate 

shall maintain the following records for a period of five years: 

XVII.C.4.a. Monthly condensate production from the tank. 

XVII.C.4.b. For any condensate storage tank required to be controlled p 

to this Section XVII. C., the date, lime and duration of any period wher 

air pollution control equipment Is not operating. The duration of a peri 

CODE OF COLORADO REGULATIONS 
34 CR 1 and 2, 01-11 Page 79 

non-operation shall be from the time that the air pollution control equipme 

was last observed to be operating until the time the equipment recomme ces 

operation. 

XVII.C.4.c. For tanks where a flare or other combustion device is being sed, 

the date and time of any Instances where visible emissions are ob erved 

from the device. · 

nly) Emission reductions from glycol natural gas dehydrators 

Beginning May 1, 008, any still vent and vent from any gas-condensate-glycol (G 

(flash separator or sh tank), if present, on a glycol natural gas dehydrator local at an oil and gas 

exploration and pr tlon operation, natural gas compressor station, drip stall or gas-processing 

plant shall reduce un trolled actual emissions of volatile organic compound by an average of at 

least 90 percent throug e use of air pollution control equipment. This Se ·on XVII.D shall not apply to any single natural g s dehydrator, or several dehydrators at a single il and gas exploration 

and production operation/s1 , natural gas compressor station, drip statio or gas-processing plant, 

with uncontrolled actual emis · ns of volatile organic compounds of le than 15 tons per year based 

on a rolling twelve-month total. To determine if a grouping of dehyd ors exceeds the 15 tons per 

year threshoJQ aggregate emiss1 s from all dehydrators on site (co tiguous and adjacent). The control requirement in this Section X .D. shall apply to each natural as dehydrator within a grouping 

that has actual uncontrolled emlssi s above two tons per year. 

XVII .E. Control of emissions from new, edified, existing, an relocated natural gas fired reciprocating Internal combustion engines. 

this Section XVI I.E. shall not apply to any 

ions below permitting thresholds listed in 

XVIJ.E.2.a. Except as pr ided in ection XVII.E.2.b. below, the owner or operator on any naturaL s fired reel ocating .internal combustion engine that is 

either constructe or relocated to e state of Colorado from another state, 

on or after the te listed in the tab below shall operate and maintain each 

engine acco · g to the manufacture s written instructions or procedures to 

the extent pr, ctlcable and consistent 'th technological limitations and good 

englneerin and maintenance practices ver the entire life of the engine so 

that it ac eves the emission standards re uired in Section XVII.E.2.b. Table 

1 bel 

Actual emissions from natural gas fire reciprocating internal comion engines shall not exceed the emission p rformance standards in Ta1 below as expressed in units of grams per ho epower-hour (G/hp-hr) 

< 100 H 

i!:100 Hp 

and< 500 H 

i!:500 Hp 

TABLE 1 

Construction or Relocation 

Date 

On or after January 1 , 2008 

On or after Janua 1 2011 

On or after July 1, 2007 

On or after Jul 1, 201 0 

CODE OF COLORADO Rl!:GULATIONS 6 CCR 1001-9 
Page 80 

XVII.E.3 E~GiatiRg NaiUIHI Gas Fired Reetproeanng ltilefflal CgRJhuslioo Engines 

XVII.E.3.a. (Regional Haze SIP) Rich Bum Reciprocating Internal Combustion 

li CCR 1001-9 

Engines 

XVII.E.3.a.(i) Except as provided in Sections XVII.3.1.(i)(b) and (c) and 

XVII.E.3.a.(ii), all rich burn reciprocating internal combustion engines 

with a manufacturer's name plate design rate greater than 500 

horsepower, constructed or modified before Febnlary 1, 2009 shall 

install and operate both a non-selective catalytic reduction system 

and an air fuel controller by July 1, 2010. A rich bum reciprocating 

Internal combustion engine is one with a normal exhaust oxygen 

concentration of less than 2°AI by volume. 

XVII.E.3.a.(l)(a) All control equipment required by this Section 

XVII.E.3.a. shall be operated and maintained pursuant to 

manufacturer specifications or equivalent to the extent practicable, and consistent with technological limitations and 

good engineering and maintenance practices. The owner or 

operator shall keep manufacturer specifications or equivalent 

on file. 

XVII.E.3.a.(i)(b) Internal combustion engines that are subject to an 

emissions control requirement in a federal maximum achievable control technology ("MACr) standard under 40 CFR 

Part 63, a Best Available Control Technology ("BACT") limit, 

or a New Source Performance Standard under 40 CFR Part 

60 are not subject to this Section XVII.E.3.a. 

XVII.E.3.a.(i)(c) The requirements of this Section XVII.E.3:a. shall 

not apply to any engine having actual uncontrolled emissions 

below permitting thresholds listed In Regulation Number 3, 

Part B. 

XVII.E.3.a.(ii) Any rich burn reciprocating Internal combustion engine constructed or modified before February 1, 2009, for which the owner or 

operator demonstrates to the Division that retrofit technology cannot 

be Installed at a cost of less than $ S,OOO·per ton of combined volatile organic compound and nitrogen oxides emission reductions (this 

value shall be adjusted for future applications according to the current day consumer price Index) is exempt complying with Section 

XVII.E.3.a. Installation costs and the best Information available for 

determining control efficiency shall be considered in determining 

such costs. In order to qualify for such exemption, the owner or operator must submit an application making such a demonstration, together with all supporting documents, to the DiVision by August 1, 

2009. 

(State Only) Lean Burn Reciprocating Internal Combustion En · 

CODE OF COLORADO REGULATIONS