## Oil and Gas Production Facilities Chapter 6, Section 2 Permitting Guidance

June 1997

Revised November 1998 Revised January 2000 Revised August 2001 Revised July 28, 2004 (specific guidance for Jonah/Pinedale Anticline Area) Revised August 2007

Revised March 2010

Revised September 2013 (Added specific guidance for UGRB and revisions to JPAD)

This Guidance applies to surface oil and gas production facilities where hydrocarbon flui ds are produced, processed and/or treated prior to custody transfer from the facility.

This Guidance does not apply to natural gas

- fired engines unless the engine i s used to power a pumping

unit. This Guidance also may not be used for sour gas (H 2 S) production facilities unless the only

emissions of H 2 S will be those associated with fugitive losses from valves, fittings, surface piping and pneumatic devices, etc. If there will be H 2 S emissions associated with vented gas or tank vapors or if

sour gas will be flared the applicant shall contact the Division for permitting guidance prior to

construction. This Guidance does not apply to sour (contained H 2 S) production facilities

.

The Presumptive BACT permitting requirements under this Guidance apply to f acilities with associated wells spud on/after August 1, 2010 and to facilities with a modification occurring on/after August 1,

201 0 , except for facilities located in the UGRB and JPAD /NPL

.

For facilities located in the UGRB and JPAD /NPL , the Presumptive BACT permitting requirements under this Guidance apply to facilities with associated wells with the first date of production (FDOP)

on/after November 1, 2013 and to facilities with a modification occurring on/after November 1, 2013

.

Startup or modification of a facility may occur prior to obtaining an Air Quality Permit or Waiver only when the Presumptive BACT permitting requirements under this Guidance are met. Otherwise, an Air Quality Permit or Waiver shall be obtained prior to st art up or modification of a facility.

For the purposes of this Guidance CDA refers to facilities located in Concentrated Development Areas

.

UGRB refers to facilities located in the Upper Green River Basin

.

JPAD /NPL refers to facilities located in the Jonah and Pinedale Anticline Development Area and Normally Pressured Lance

.

STATEWIDE refers to all facilities not located in the CDA or UGRB.

## Table of Contents

Applicability

............................................................................................................................. .................... ............ 1 When is a permit needed

......................................................................... ............................................................... 1 Which pollutants are associated with O&G Production Facilities

........................................................................ 1 Production Facility Emission Sources

................. ...................................................................... ............. ............... 2 O&G Production Facility equipment emission sources

........................................................................................ 2

BACT and Presu mptive BACT (what is it and when to use it)............................................................................. 3
JPAD /NPL UGRB CDA STATEWIDE M ap

............................................................................................ ... .. 4

STATEWIDE P

- BACT permitting requirements

................................................................... ................................ 6 Flashing

............................................................................................................................. ................................... 6 Dehydration Units

............................................................................ .................................................................... 7

Scenario 1

............................................................................................................................. ............................ 7

Scenario 2

......... ............................................................................................................................. ................... 8 Determining potential uncontrolled and potential emissions from dehydration units

............................ ......... 9 Pneumatic pumps

............................................................................................................................. .................... 10

Pneumatic controllers

........................................................... ............................................................................... 11 Blowdown and venting

............................................................................................................................. ........... 11

Emission sour ces without P

- BACT requirements

............................................................................................... 11

CDA P

- BACT permitting requirements

........................................................................................... ........................ 12 Flashing.....................................................................................................................

........................................... 12 Dehydration Units.......................................

......................................................................................................... 13

Scenario 1...................................................................................................................

...................... ................ 13

Scenario 2...................................................................................................................

...................................... 14 Pneumatic pumps......................................................

........................................................................................... 1 5

Pneumatic controllers........................................................................................................

.................................. 16 Well completions.............................................................................................................

................................... . 1 6

Produced water tanks

.................................................................... ....................................................................... 1 7 Blowdown and venting.........................................................................................................

............................... 18

Emission sources without P

- BACT requirements............................................................................................... 18

UGRB P

- BACT permitting requirements

.............................................................................................. ................ 19 Flashing.....................................................................................................................

........................................... 19 Dehydration Units...............................................

................................................................................................. 20 Pneumatic pumps..............................................................................................................

.............................. ..... 21

Pneumatic controllers........................................................................................................

.................................. 21 Fugitives...........................................................................

................................................................................... 22 Well completions.............................................................................................................

.................................... 22

Prod uced water tanks.............................................................................................................

.............................. 23 Blowdown and venting.............................................................................

........................................................... 24

Emission sources without P

- BACT requirements............................................................................................... 24

## Table of Contents (cont.)

JPAD /NPL P

- BACT permitting requirements

..................................................................................................... 25 Flashing.....................................................................................................................

........................................... 25 Dehydration Units...................................................................

............................................................................. 25 Pneumatic pumps..............................................................................................................

................................... 26

Pneumatic c ontrollers...................................................................................................................

....................... 26

Produced water tanks....................................................................................

....................................................... 27 Fugitives....................................................................................................................

.......................................... 27

Well completions..................................................................................................................

............................... 27 Blowdown and venting............................................................................

............................................................ 28

Emission sources without P

- BACT requirements............................................................................................... 28

Determining P

- BACT emissions

.................... ...................................................................................................... 29 Flashing

............................................................................................................................. ................. ................. 29 Dehydration Units

............................................................................................................................. .................. 31 Kimray glycol pump rates (Table 1)

..................................... .......................................................................... 32 BACT Emission control requirements

............................................................................................................... 33 Flashing emissions

............................................................................................................................. ................. 33 Dehydration unit emissions

............................................................................................................................. ... 34

Sources without P

- BACT emission control requirements

........................................................................ .......... 35 Permit applications

............................................................................................................................. .................. 36 A complete application includes

............................................. ............................................................................ 36

How to obtain forms

............................................................................................................................. .............. 37

When/where to file application

.... ....................................................................................................................... 37 Example process diagram and description

.......................................................................... ................................ 38 Application review process, public notice, billing

.............................................................................................. 40

Notice of Installation

............................................................................................................................. ................ 41 NOI use as complete application

................................................................................ ......................................... 41 NOI use as equipment change notification

.......................................................................................................... 41 Example for use of NOI

....................................... ............................................................................................... 42

How to obtain NOI form

............................................................................................................................. ........ 4 4

When/where to file NOI form

............................................................................................................................. 44

JPAD /NPL permit application

– specific requirements

............................................... ................... . ................. 45 AQD Pinedale 1 forms

............................................................................................................................. ........... 46 Explanation of 0.6 decline factor

...................... ................................................................................................... 47 Appendix A

– Permit Application Forms

........................................................................................................... 48 AQD

- OG0 Application Identification

.......................................................................................................... 49 AQD

- OG0 NOI Identification

...................................................................................... ................................ 50 AQD OG00 Checklist for Complete Application

.......................................................................................... 51 AQD

- OG1 Application Cover Sheet

.................................................... ........................................................ 52 AQD

- OG2 Equipment List

........................................................................................................................... 53

Equipment List Page 2

............................................................................................................... 54 AQD

- OG3 Storage Tanks, Pressurized Vessels and Pneumatic Pumps

...................................................... 55 AQD

- OG4 Dehydration U nits

...................................................................................................................... 56 AQD

- OG5 Pumping Unit Engines

...................................................................................................... ......... 57 AQD

- OG6 Emission Summary

.................................................................................................................... 58 AQD

- OG7 NOI

........................................................................................ .................................................... 59 AQD

- OG8 Multiple Facilities

...................................................................................................................... 60 AQD

- OG9 Change of Ownership

........................ ......................................................................................... 61 AQD

- OG10 BACT Cost Analysis Worksheet

................................................................................................ 62

## Table of Contents (cont.)

Appendix B

– Emission Calculations

.................................................................................................................. 63

AP

- 42 emission factors

......................................................................... .................................................................. 64 Storage tank emissions (flashing, working, breathing losses)

............................................................................... 64 Pressurized vessels (separator, treater, FW KO, flash separator, gunbarrel, gas boot)

........................................... 65 Dehydration units

............................................................................................................................. ....................... 65 Natural gas

- fired heaters

............................................................................................................................. ............ 66

Flares

............................................................................................................................. .......................................... 67 Pneumatic pumps

...................................................................... .............................................................................. 68 Truck loading

............................................................................................................................. ............................. 68 Fug itives

............................................................................................................................. ..................................... 69 IC pumping unit engines

............................................................. ............................................................................ 71

Mol% to Wt% conversion

............................................................................................................................. ......... . 71 Appendix C

– Definitions

............................................................................................................................. .......... . 72

## Acronyms and Abbreviations

AQD Air Quality Division

API American Petroleum Institute

BACT Best Available Control Technology

BBL barrel

BPD barrels per day

BTEX Benzene/Toluene/

Ethyl

- benzene/Xylenes

Btu British thermal unit

C6 S2 Chapter 6 Section 2 (of the WAQSR)

CAA Clean Air Act Amendments of 1990

CDA Concentrated Development Area

CO Carbon Monoxide

EPA Environmental Protection Agency

gpm gallons per minute

H 2 S Hydrogen Sulfide

HAP Hazardous Air Pollutants

HP high pressure Hp horsepower

JPAD Jonah & Pinedale Anticline

Development Area

lb pound

LP low pressure

MMBtu one million BTUs

MMSCF one million standard cubic feet

( SCF × 10 6 ) (MMSCFD = 1,000,000 SCF per day)

MSCF one thousand standard cubic feet

( SCF×1000) (MSCFD=10 00 SCF per day) NESHAP National Emission Standards for

Hazardous Air Pollutants

NOI Notice of Installation

NOV Notice of Violation

NO X Nitrogen Oxides

NSPS New Source Performance Standards

NSR New Source Review pph pounds per hour

PPMV parts per million by volume

PSD Prevention of Significant Deterioration psig pounds per square inch gauge psia pounds per square inch absolute

SCF standard cubic foot

SO 2 Sulfur Dioxide

S/W/B Standing/Working/Breathing losses

TEG T ri

- Ethylene Glycol

T PY Tons per Year

VOC Volatile Organic Compounds WAQD Wyoming Air Quality Division WAQSR Wyoming Air Quality Standards and

Regulations WDEQ Wyoming Department of

Environmental QualityC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 1 of 76



## Introduction

The Chapter 6 Section 2 Oil and Gas Production Facilities Permitting Guidance (C6 S2 Guidance) document serves as a supplement to the Wyoming Air Quality Standards and Regulations ( WAQSR ) Chapter 6 Section 2 New Source Review (NSR) permitting program. The C6 S2 Guidance applies solely to the permitting of oil and gas production facilities.

Obtain a copy of the C6 S2 Guidance by contacting the Wyoming Air Quality Division at (307) 777

- 7391

or download a PDF version from http://deq.state.wy.us/aqd/



## Applicability

If ANY air pollutant will be released to the atmosphere from a new or modified facility, the facility is subject to the WAQSR and the Wyoming Environmental Quality Act.

Owners/operators of ALL regulated air emission sources constructed or modified after May 29, 1974 shall comply with the WAQSR Chapter 6, Section 2 permitting requirements.

Failure to comply with Wyoming air quality regulations may result in an enforcement action in the form

o f a “Notice of Violation” and penalties of up to $10,000.00 per day.

To obtain a copy of the WAQSR contact the Wyoming Air Quality Division at (307) 777

- 7391 or

download the PDF version from http://deq.state.wy.us /aqd/

Air pollutants associated with O&G production facilities are:

Volatile Organic Compounds ( VOC ): Hydrocarbon compounds excluding methane (C 1 ) and ethane (C 2 ). VOCs are also referred to as C 3 + compounds

– propane, butane, pentane, hexane, + etc.

Hazardous Air Pollutants ( HAP ): Section 112(b) of the Clean Air Act lists 188 HAPs. HAPs commonly associated with O&G production are BTEX and n

- hexane (benzene, toluene, ethyl

- benzene, xylenes and n

- C 6 ).

Nitrogen Oxides ( NO X ): NO X emissions are the result of natural gas combustion.

Carbon Monoxide ( CO ): CO emissions are the result of natural gas combustion.

Hydrogen Sulfide ( H 2 S ): Sour gas and Sulfur Dioxide ( SO 2 ) created when sour gas is combusted.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 2 of 76



## Production Facility Emission Sources

O&G production facilities emission sources:

Storage Tanks : Vapors containing regulated air pollutants are released from solution as oil, condensate and water are transferred from separation equipment to atmospheric storage tanks. These vapors are called flashing losses . Vapors evaporated or displaced from tanks are called working and breathing (also called standing) losses

.

Dehydration Units : Glycol, usually tri

- ethylene glycol (TEG), is used in dehydration units to absorb

water from wet produced gas. “Lean” TEG contacts the wet gas and absorbs water. The TEG, now considered “rich” is routed through a flash separator and/or reboiler for regeneration. Vapors released from the flash separator and reboiler still vent contain regulated air pollutants.

Pressurized Process Vessels : Vapors vented from gun barrels, separators, treaters, water knockouts, gas boots, flash separators, drip pots, etc. contain regulated air pollutants. The discharge lines and vents from

all of these vessels s hall be considered when determining emission sources.

Natural Gas

- Fired Equipment : Some of the byproducts of natural gas combustion in process heaters, boilers, burners, flares, engines, etc. are regulated air pollutants.

Fugitives : All production faci lities contain numerous equipment components such as valves, flanges, threaded connections, tubing connections, open

- ended lines, pump seals, etc which are manufactured and installed in ways intended to contain gases or liquids. Over time some of them beg in to leak. Unintentional emissions associated with leaks are called fugitive emissions. For purposes of this Guidance, emissions from components that are improperly designed (e.g. enardo valves over pressurizing,

failure of thief hatches to reseat after over pressurizing) or equipment not maintained properly (e.g., thief hatch left open) are not considered to be fugitive emissions.

Pneumatic Pumps & Controllers : The discharge vapors from natural gas

- operated pneumatic equipment contain regulated air pollutants.

Truck Loading : Vapors displaced from truck tanks during the loading of oil or condensate contains regulated air pollutants.

Venting & Blow down : Natural gas and liquids contain regulated air pollutants.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 3 of 76



## BACT and Presumptive BACT

Under C6 S2, all new or modified sources or facilities which may generate regulated air emissions shall be permitted prior to start up or modification and Best Available Control Technology (BACT) shall be applied to reduce or eliminate emissions, with consideration given for technical feasibility and

economical reasonableness. BACT is a process, not an emission limit. Regulation does not set a

minimum emission threshold below which BACT does not need to be considered.

At O&G facilities production rates and associated pollutant emissions are usually unknown prior to start up. The AQD has tailored a permitting program allowing for the start up or modification of O&G facilities prior to permittin g provided specific emission control requirements are met.

This is the Presumptive BACT permitting process for O&G production facilities.

Presumptive BACT requirements have been established for emissions associated with: Flashing & working/breathing loss es from atmospheric storage tanks and pressurized vessels Dehydration unit process vents Natural gas

- operated pneumatic equipment Natural gas

- fired pumping unit engines

If emissions are known prior to construction or modification, a permit shall be obtained PRIOR TO

CONSTRUCTION or MODIFICATION and Presumptive BACT shall be addressed in the application. Examples include: Construction of a central tank battery for collecting and processi ng production from surrounding existing wells with known production rates; Consolidation of multiple existing facilities for which production rates have been established; Installation of a dehydration unit for an existing well with an established gas produ ction rate; Installation of larger capacity equipment to replace undersized equipment; Replacement of an emission control system or device with a different system or device.

Presumptive BACT requirements have been established for four (4) areas:

CDA refe rs to facilities located in Concentrated Development Areas

.

UGRB refers to facilities located in the Upper Green River Basin

.

JPAD /NPL refers to facilities located in the Jonah and Pinedale Anticline Development Area and Normally Pressured Lance

.

STATEWIDE refers to all facilities not located in the CDA

, UGRB , or JPAD /NPLC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 4 of 76

The CDA is defined by six (6) counties: Uinta, Lincoln, Carbon, Sweetwater, Fremont, and Natrona

The UGRB area is defined as :

Sublette County: (all)

Lincoln County: (part) The area of the county north and east of the boundary defined by a line starting at the point

defined by the intersection of the southwest corner Section 30 Range (R) 115 West Township (T)

27N and the northwest corner of Section 31 R 115 West T 27N of Sublette County at Sublette County's border with Lincoln County. From this point the boundary moves to the west 500 feet to the Aspen Creek. The boundary follows the centerline of Aspen Creek downstream to the confluence of Aspen Creek and Fontenelle Creek (in R 116 W T26N, Section 1). From this point the boundary moves generally to the south along the centerline of Fontenelle Creek to the confluence of Fontenelle Creek and Roney Creek (in R115W T24N Section 6). From the
confluence, t he boundary moves generally to the east along the centerline of Fontenelle Creek and into the Fontenelle Reservoir (in R112W T24N Section 6). The boundary moves east southeast along the centerline of the Fontenelle Reservoir and then toward the south alon g the centerline of

the Green River to where the Green River in R111W T24 N Section 31 crosses into Sweetwater County.

Sweetwater County: (part) The area of the county west and north of the boundary which begins at the midpoint of

the Green River, where the Green River enters Sweetwater County from Lincoln County in R111W T24N Section 31. From this point, the boundary follows the center of the channel of the Green River generally to the south and east to the confluence of the Green River and the Big Sandy River (in R109W R22 N Section 28). From this point, the boundary moves generally north and east along the centerline of the Big Sandy River to the confluence of the Big Sandy River with Little Sandy Creek (in R106W T25N Section 33). The boundary continu es generally toward the northeast long the centerline of Little Sandy Creek to the confluence of Little Sandy Creek and Pacific Creek (in R106W T25N Section 24). From this point, the boundary moves generally to the east and north along the centerline of P acific Creek to the confluence of Pacific Creek and Whitehorse Creek (in R103W T26N Section 10). From this point the boundary follows the centerline of Whitehorse Creek generally to the northeast until it reaches the eastern boundary of

Section 1 R103W T 26North. From the point where Whitehorse Creek crosses the eastern section line of Section 1 R103W T 26North, the boundary moves straight north along the section line to the southeast corner of Section 36 R103W T27N in Sublette County where the boundary e nds.

The JPAD /NPL area is defined as:

109W & R110W in T34N,
R109W & R110W in T33N,
R108W, R109W & R110W in T32N,
R108W, R109W & R110W in T31N,
R107W, R108W & R109W in T30N,
R107W, R108W, R109W, & R110W in T29N,
R107W, R108W, R109W, & R110W in T28N,

and R 107W, R108W & R109W in T27N

The STATEWIDE refers to all other areas

.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 5 of 76C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 6 of 76



## Presumptive BACT Requirements for Statewide F acilities

Flashing

For the purpose of determining flashing emissions all vapor streams containing VOC or HAP components from all storage tanks (e.g., oil, condensate, produced water with oil or condensate carryover) and all separation vessels (e.g., gun barrels, production a nd test separators, production and test treaters, water knockouts, gas boots, flash separators, drip pots, etc.) at a facility which are or may be vented to the atmosphere shall be considered.

New Facilities

Within 60

- days of the First Date of Production (FDOP), flashing emissions containing greater than or equal to 10 TPY VOC shall be controlled by at least 98%.

Modified Facilities

Within 60

- days of modification, new and existing flashing emissions containing greater than or equal to

10 TPY VOC shall be controlled by at least 98%.

New and Modified Facilities Condensate and oil tanks that are on site for use during emergency or upset conditions, such as spare tanks at facilities connected to liquids gathering systems, are not subject to the 98% control r equirements.

The removal of flashing emissions control devices may be allowed upon approval after one year if VOC flashing emissions have declined to less than, and are reasonably expected to remain below 8 TPY.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 7 of 76



## Presumptive BACT Requirements for Statewide F acilities (cont.)

Dehydration Units

To meet the P

- BACT requirements for dehydration units

, operators must
follow either Scenario 1 or Scenario 2.

For the purpose of determining emissions from dehydration units, vapor streams containing VOC or HAP components released from the process vents (reboiler still vents & glycol flash separator vents) of all dehydration units at a facility which are or may be vented to the atmosphere shall be considered.



## Scenario 1

New Facilities

PAD Facilities Upon FDOP, all dehydration unit VOC and HAP emissions shall be controlled by at least 98%. After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emissions from all units are less than 6 TPY a nd All units are equipped with still vent condensers.

Single Well Facilities Upon FDOP, all dehydration units shall be equipped with reboiler still vent condensers. The condensers may not later be removed.

Within 60

- days of FDOP, if total potential unco ntrolled 1 VOC emissions from all units are greater than or equal to 6 TPY, emissions from all units shall be controlled by at least 98%.

After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emissions from all units are less than 6 TPY and All units are equipped with still vent condensers.

Modified Facilities Requirements are the same as those for PADs and single well facilities except use the date of modification in place of FDOP. Control r equirements apply to existing and new dehydration

units.

1 See definitions on Page 9C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 8 of 76



## Presumptive BACT Requirements for Statewide F acilities (cont.)

Dehydration Units

Scenario 2

New PAD and Single Well Facilities Upon FDOP, all dehydration units shall be equipped with glycol flash separators and reboiler still vent condensers. Removal of the flash separators and condensers will not be allowed.

Within 30

- days of FDOP, if total potential uncontrolled 1 VOC emissions from all dehydration units are greater than or equal to 8 TPY, at least 98% control of emissions shall be installed and operational on all units.

After one year, combustion units used to achieve the 98% control may be removed upon approval

if

To tal potential 1 VOC emissions from all units are less than 8 TPY and All units are equipped with flash separators and still vent condensers.

Modified Facilities Upon modification, glycol flash separators and reboiler still vent condensers shall be install ed and operating on all new and existing dehydration units. Removal of the flash separators and

condensers will not be allowed.

Within 30

- days of modification, if total potential uncontrolled 1 VOC emissions are greater than or equal to 8 TPY, at least 98% control of emissions shall be installed and operational on all new and existing dehydration units.

After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emissions from all units are less than 8 TPY and All units are equipped with flash separators and still vent condensers.

All Facilities When a combustion unit is required at a facility for control of flash or dehydration unit emissions,

all non

- condensable still vent vapors shall be collec ted and routed to the combustion unit for at least 98% control of VOC and HAP emissions and all glycol flash separator vapors shall be

collected and routed to the combustion unit for at least 98% control of VOC and HAP emissions and/or used as fuel for pro cess equipment burners.

At facilities where a combustion unit is not required for control of flash or dehydration unit emissions, all glycol flash separator vapors shall be collected for use as fuel in process equipment burners. Excess flash vapors that are not used as fuel may be vented to the atmosphere.

1 See definitions on Page 9C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 9 of 76



## Presumptive BACT Requirements for Statewide F acilities (cont.)

Dehydration Units

Potential Uncontrolled VOC emissions shall be determined using GRI

- GLYCalc V3.0 or higher or other method accepted by the Division and shall be based on the projected, year one, average daily dry gas throughput rate, maximum circulation rate for the glycol circulation pump(s) i nstalled, average expected operating parameters for wet gas temperature and pressure, maximum dry gas water content or number of absorber stages and extended hydrocarbon content of the wet gas from a sample of the wet gas taken upstream of the dehydration unit contact tower. Flash separators and still vent condensers, limited operating hours and limited glycol circulation rates shall not be considered when determining potential

uncontrolled emissions.

Still vent condensers shall consist of equipment engin eered and designed to achieve maximum condensation of the condensable components in the still vent vapors by providing adequate temperature differentials between the condenser outlet and still vent stream. Still vent pipes shall not be considered

condense rs.

Potential emissions for determining combustion device removal after one year shall be calculated using

GRI

- GLYCalc V3.0 or higher or other method accepted by the Division based on the most recent 30

- days of normal gas production rates, actual average wet gas temperature and pressure, actual water content of the dried gas or number of absorber stages, “worst case” operating parameters of the glycol flash separator and still vent condenser.

“Worst case” flash separator and condenser parameters are:

1 ) maximum glycol flash separator operating pressure 2) lowest glycol flash separator operating temperature 3) maximum still vent condenser outlet temperature 4) maximum still vent condenser outlet pressure 5) all vapors from flash separator are vented

A ctual operating parameters for glycol flash separators and still vent condensers may be used upon approval. Limited operating hours and limited glycol circulation rates shall not be considered when determining potential emissions.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 10 of 76



## Presumptive BACT Requirements for Statewide F acilities (cont.)

Pneumatic Pumps

New Facilities

PAD Facilities Upon FDOP, VOC and HAP emissions associated with the discharge streams of all natural gas

operated pneumatic pumps shall be controlled by at least 98% or the pump discharge streams shall be routed into a closed loop system (e.g., sales line, collection lin e, fuel supply line).

Single Well Facilities

Within 60

- days of FDOP,

At sites with combustion units installed for the control of flash or dehydration unit

emissions: VOC and HAP emissions associated with the discharge streams from natural gas

operated p neumatic pumps shall be controlled by at least 98% by routing the pump discharge streams into the combustion unit or the discharge streams shall be routed into a closed loop system.

At sites without combustion units installed for the control of flash or d ehydration unit

emissions: Pneumatic pumps (other than those for heat trace/heat medium/hot glycol circulation) shall be solar, electric or air

- driven pumps in lieu of natural gas

operated pneumatic pumps. Wherever possible, heat trace/heat medium/hot gly col circulation pumps shall be solar

- operated, electric or air

- driven.

Modified Facilities Requirements are the same as above except include all new and existing pneumatic pumps and use the date of modification in place of FDOP.

New and Modified Facili ties At sites where pneumatic pump emissions are controlled by a combustion unit used for the control of flash or dehydration unit emissions, control of the pneumatic pump emissions will be evaluated upon request for removal of the combustion unit

. (S ee F lashing, Page 6)C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 11 of 76



## Presumptive BACT Requirements for Statewide F acilities (cont.)

Pneumatic Controllers

New Facilities Upon FDOP, natural gas

- operated pneumatic controllers shall be low* or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Modified Facilities Upon modification, new natural gas

- operated pneumatic controllers shall be low or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Within 60

- days of modification, existing natural gas

- operated pneumatic controllers shall be replaced by or converted to low or no

- bleed controllers or the discharge streams of the existing natural gas

- operated contr ollers shall be routed into a closed loop system.

* low bleed devices vent less than 6 cfh



## Blowdown and Venting

Best Management Practices (BMP) and information gathering requirements will be incorporated into permits for new and modified facilities.

BMP: During manual and automated blow down/venting episodes associated with liquids unloading, wellbore depressurization in preparation for maintenance or repair, hydrate clearing, emergency operations, equipment depressurization, etc., associated VOC and HAP emissions shall be minimized to the extent practicable. During manual blow down/venting, personnel shall remain on site to ensure minimal gas venting occurs.

Information Gathering: Specific recordkeeping and reporting requirements will be establishe d during the permitting process and will include estimates of associated regulated air pollutants, reasons for episodes, durations of episodes, steps taken to minimize emissions and descriptions of

emission estimation methods.



## Emission Sources without P resumptive BACT requirements

For uncontrolled sources emitting greater than or equal to 8 TPY VOC or greater than or equal to 5 TPY

total HAPs that do not have P

- BACT requirements, a BACT analysis shall be filed with the permit application for the associated facility.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 12 of 76



## Presumptive BACT Requirements for CDA Facilities

Flashing

For the purpose of determining flashing emissions all vapor streams containing VOC or HAP components from all storage tanks (e.g., oil, condensate, produced water with oil or condensate carryover) and all separation vessels (e.g., gun barrels, production a nd test separators, production and test treaters, water knockouts, gas boots, flash separators, drip pots, etc.) at a facility which are or may be vented to the atmosphere shall be considered.

New Facilities

PAD Facilities Upon FDOP, VOC and HAP flashing emissions shall be controlled by at least 98%.

Single Well Facilities

Within 60

- days of FDOP, flashing emissions containing greater than or equal to 8 TPY VOC shall be controlled by at least 98%.

Modified Facilities

PAD Facilities Upon modification, all new and existing VOC and HAP flash emissions shall be controlled by at least 98%.

Single Well Facilities

Within 60

- days of modification, all new and existing flashing emissions containing greater than or equal to 8 TPY VOC shall be controlled by at least 98%.

New and Modified Facilities Condensate and oil tanks that are on site for use during emergency or upset conditions, such as spare tanks at facilities connected to liquids gathering systems, are not subject to the 98% control requirements.

The removal of flashing emissions control devices may be allowed upon approval after one year if VOC flashing emissions have declined to less than, and are reasonably expected to remain

below 8 TPY.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 13 of 76



## Presumpt ive BACT Requirements for CDA Facilities (cont.)

Dehydration Units

To meet the P

- BACT requirements for dehydration units

, operators must
follow either Scenario 1 or Scenario 2.

For the purpose of determining emissions from dehydration units, vapor streams containing VOC or HAP components released from the process vents (reboiler still vents & glycol flash separator vents) of all dehydration units at a facility which are or may be vented to the atmosphere shall be considered.



## Scenario 1

New Facilities

PAD Facilities Upon FDOP, all dehydration unit VOC and HAP emissions shall be controlled by at least 98%. After one year, combustion units used to achieve the 98% control may be r emoved upon approval

if

Total potential 1 VOC emissions from all units are less than 6 TPY and All units are equipped with still vent condensers.

Single Well Facilities Upon FDOP, all dehydration units shall be equipped with reboiler still vent condensers. Removal

of the condensers will not be allowed.

Within 60

- days of FDOP, if total potential uncontrolled 1 VOC emissions from all units are greater than or equal to 6 TPY, emissions from all units shall be controlled by at least 98%.

After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emissions from all units are less than 6 TPY and All units are equipped with still vent condensers.

Modified Facilities Requirements are the same as those for PADs and single well facilities except use the date of modification in place of FDOP. Control requirements apply to existing and new dehydration

units.

1 See definitions on Page 9C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 14 of 76



## Presumptive BACT Requirement s for CDA Facilities (cont.)

Dehydration Units

Scenario 2

New PAD and Single Well Facilities Upon FDOP, all dehydration units shall be equipped with glycol flash separators and reboiler still

vent condensers. Removal of the flash separators and condensers will not be allowed.

Within 30

- days of FDOP, if total potential uncontrolled 1 VOC emissions from all dehydration units are greater than or equal to 8 TPY, at least 98% control of emissions shal l be installed and operational on all units.

After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emissions from all units are less than 8 TPY and All units are equipped with flash separators and still vent condensers.

Modified Facilities Upon modification, glycol flash separators and reboiler still vent condensers shall be installed and operating on all new and existing dehydration units. Removal of the flash separators and still

vent condensers will not be allowed.

Within 30

- days of modification, if total potential uncontrolled 1 VOC emissions are greater than or equal to 8 TPY, at least 98% control of emissions shall be installed and operational on all new and existing dehydra tion units.

After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emissions from all units are less than 8 TPY and All units are equipped with flash separators and still vent condensers.

All Facilities When a combustion unit is required at a facility for control of flash or dehydration unit emissions,

all non

- condensable still vent vapors shall be collected and routed to the combustion unit for at

least 98% control of VOC and HAP emissions and all glycol flash separator vapors shall be

collected and routed to the combustion unit for at least 98% control of VOC and HAP emissions and/or used as fuel for process equipment burners.

At facilities wh ere a combustion unit is not required for control of flash or dehydration unit emissions, all glycol flash separator vapors shall be collected for use as fuel in process equipment burners. Excess flash vapors that are not used as fuel may be vented to the atmosphere.

1 See definitions on Page 9C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 15 of 76



## Presumptive BACT Requirements for CDA Facilities (cont.)

Pneumatic Pumps

New Facilities

PAD Facilities Upon FDOP, VOC and HAP emissions associated with the discharge streams of all natural gas

- operated pneumatic pumps shall be controlled by at least 98% or the pump discharge streams shall be routed into a closed loop system (e.g., sales line, collection

lin e, fuel supply line).

Single Well Facilities

Within 60

- days of FDOP, At sites with combustion units installed for the control of flash or dehydration

unit emissions: VOC and HAP emissions associated with the discharge streams from natural gas

- operated pneumatic pumps shall be controlled by at least 98% by routing the pump discharge streams into the combustion unit or the discharge streams shall be routed into a closed loop system.

At sites without combustion units installed for the control of flash or dehydration

unit emissions: Pneumatic pumps (other than heat trace/heat medium/hot glycol circulation) shall be solar, electric or air

- driven pumps in lieu of natural

gas

- operated pneumatic pumps. Wherever possible, heat trace/heat medium/hot glycol circu lation pumps shall be solar

- operated, electric or

air

- driven.

Modified Facilities Requirements are the same as above except include all new and existing pneumatic pumps and use the date of modification in place of FDOP.

New and Modified Facilities

At s ites where pneumatic pump emissions are controlled by a combustion unit used for the control of flash or dehydration unit emissions, control of the pneumatic pump emissions will be evaluated upon request for removal of the combustion unit. ( S ee Flashing, Page 12)C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 16 of 76



## Presumptive BACT Requirements for CDA Facilities (cont.)

Pneumatic Controllers

New Facilities Upon FDOP, natural gas

- operated pneumatic controllers shall be low* or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Modified Facilities Upon modification, new natural gas

- operated pneumatic controllers shall be low or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Within 60

- days of modification, existing natural gas

- operated pneumatic controllers shall be replaced by or converted to low or no

- bleed controllers or the discharge streams of existing natural gas

- operated pneumatic controllers s hall be routed into closed loop system.

* low bleed devices vent less than 6 cfh



## Well Completions

Operators shall submit applications to perform well completions using Best Management Practices. One permit will be issued to each company that drills and completes wells within the Concentrated Development Areas. The permits will be modeled after those issued to companies completing wells in the Jonah and Pinedale Anticline Development Area. An example of a well completions or “Green Completions” permit is available on the AQD website, http://deq.state.wy.us/aqd or a copy may be obtained by contacting the Wyoming Air Quality Division at (307) 777

- 7391.

Green Completion permit applications shall be filed with the Division by November 1, 2010.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 17 of 76



## Presumptive BACT R equirements for CDA Facilities (cont.)

Produced Water Tanks

New Facilities

PAD Facilities Upon FDOP, VOC and HAP emissions from all active produced water tanks shall be controlled by at least 98%.

Single Well Facilities

Within 60

- days of FDOP, at sites where flashing emissions must be controlled by at least 98%, VOC and HAP emissions from all active produced water tanks shall be controlled by at least 98%.

Modified Facilities

PAD Facilities Upon modification, VOC and HAP emissions from all new active pr oduced water tanks shall be controlled by at least 98%.

Within 60

- days of modification, existing open

- top, active, produced water tanks shall be taken out of service for use as active produced water tanks. All active produced water

tanks shall be closed top and shall have VOC and HAP emissions controlled by at least

98%.

New and Modified Facilities

Open

- top or blow down tanks shall not be used as active produced water tanks but may be used for blow down or for temporary storage during emergency or upset conditions, such as spare tanks at facilities connected to liquids gathering systems, and do not have to be tied into 98% control systems.

Removal of produced water tank emissions control may be allowed upon approval

. (S ee Flashing, Page 12)C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 18 of 76



## Presumptive BACT Requirements for CDA Facilities (cont.)

Blowdown/Venting

Best Management Practices (BMP) and information gathering requirements will be incorporated into permits for new and modified facilities.

BMP: During manual and autom ated blow down/venting episodes associated with liquids unloading, wellbore depressuriza tion in preparation for maintenance or repair, hydrate clearing, emergency operations, equipment depressurization, etc., associated VOC and HAP emissions shall be minimized to the extent p racticable. During manual blow down or venting, personnel

shall rema in on site to ensure minimal gas venting occurs.

Information Gathering: Specific recordkeeping and reporting requirements will be established during the permitting process and will include estimates of associated regulated air pollutants,

reasons for episodes, durations of episodes, steps taken to minimize emissions and descriptions of

emission estimation methods.

For companies with existing facilities as of the date of this Guidance, blow down and venting permit applications shall be filed by November 1, 2010.



## Emission Sources without Presumptive BACT requirements

For uncontrolled sources emitting greater than or equal to 8 TPY VOC or greater than or equal to 5 TPY

total HAPs that do not have P

- BACT requirements, a BACT analysis shall be filed with the permit application for the associated facility.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 19 of 76



## Presumptive BACT Requirements for UGRB Facilities

Flashing

For the purpose of determining flashing emissions all vapor streams containing VOC or HAP components from all storage tanks (e.g., oil, condensate, produced water with oil or condensate carryover) and all separation vessels (e.g., gun barrels, production a nd test separators, production and test treaters, water knockouts, gas boots, flash separators, drip pots, etc.) at a facility which are or may be vented to the atmosphere shall be considered.

New Facilities

PAD Facilities Upon FDOP, VOC and HAP flashing emissions shall be controlled by at least 98%.

Single Well Facilities

Within 60

- days of FDOP, for flashing emissions containing greater than or equal to 4

TPY VOC

, VOC and HAP flashing emissions shall be controlled by at least 98%.

Modified Facilities

PAD Facilities Upon modification, all new and existing VOC and HAP flash emissions shall be controlled by at least 98%.

Single Well Facilities

Within 60

- days of modification, all new and existing flashing emissions containing greater than or equal to 4 TP Y VOC

, VOC and HAP flashing emissions shall be controlled by at least 98%.

New and Modified Facilities Condensate and oil tanks that are on site for use during emergency or upset conditions, such as spare tanks at facilities connected to liquids gathering systems, are not subject to the 98% control requirements.

T he removal of flashing emissions control devices may be allowed upon approval after one year if VOC flashing emissions have declined to less than, and are reaso nably expected to remain

below 4 TP Y.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 20 of 76



## Presumptive BACT Requirements for UGRB Facilities (cont.)

Dehydration Units

For the purpose of determining emissions from dehydration units, vapor streams containing VOC or HAP components released from the process vents (reboiler still vents & glycol flash separator vents) of all dehydration units at a facility which are or may be vented to the atmosphere shall be considered.

New Facilities

PAD Facilities Upon FDOP, all dehydration unit VOC and HAP emissions shall be controlled by at least 98%. After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emission s from all units are less than 4 TPY and All units are equipped with still vent condensers.

Single Well Facilities Upon FDOP, all dehydration units shall be equipped with reboiler still vent condensers. Removal

of the condensers will not be allowed.

Within 60

- days of FDOP, if total potential uncontrolled 1 VOC emissions from all units are greater than or equal to 4 TPY, VOC and HAP emissions from all units shall be controlled by at

least 98%.

After one year, combustion units used to achieve the 98% control may be removed upon approval

if

Total potential 1 VOC emissions from all units are less than 4 TPY and All units are equipped with still vent condensers.

Modified Facilities Requirements are the same as those for PADs and single well facilities except use the date of modification in place of FDOP. Control requirements apply to existing and new dehydration

units.

All Facilities When a combustion unit is required at a facility for control of f lash or dehydration unit emissions,

all non

- condensable still vent vapors shall be collected and routed to the combustion unit for at least 98% control of VOC and HAP emissions and all glycol flash separator vapors shall be

collected and routed to the comb ustion unit for at least 98% control of VOC and HAP emissions and/or used as fuel for process equipment burners.

At facilities where a combustion unit is not required for control of flash or dehydration unit emissions, all glycol flash separator vapors shall be collected for use as fuel in process equipment burners. Excess flash vapors that are not used as fuel may be vented to the atmosphere.

1 See definitions on Page 9C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 21 of 76



## Presumptive BACT Requirements for UGRB Facilities (cont.)

Pneumatic Pumps

New Facilities Upon FDOP, VOC and HAP emissions associated with the discharge streams of all natural gas

operated pneumatic pumps shall be controlled by at least 98% or the pump discharge streams shall be routed into a closed loop system (e.g., sales line, collection line, fuel supply line).

Modified Facilities Upon modification, VOC and HAP emissions associated with the discharge streams of all new

a nd existing natural gas

- operated pneumatic pumps shall be controlled by at least 98% or the pump discharge streams shall be routed into a closed loop system.

New and Modified Facilities At sites where pneumatic pump emissions are controlled by a combustion unit used for the control of flash or dehydration unit emissions, control of the pneumatic pump emissions will be evaluated upon request for removal of the combustion unit. ( S ee Flashing, Page 19 )



## Pneumatic Controllers

New Facilities Upon FD OP, natural gas

- operated pneumatic controllers shall be low* or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Modified Facilities Upon modification, new natural gas

- operated pneumatic controllers shall be low or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Within 60

- days of modification, existing natural gas

- operated pneumatic controllers shall be replaced by or converted to low or no

- bleed contr ollers or the discharge streams of existing natural gas

- operated pneumatic controllers shall be routed into closed loop system.

* low bleed devices vent less than 6 cfhC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 22 of 76



## Presumptive BACT Requirements for UGRB Facilities (cont.)

Fugitives

For new and modified facilities where fugitive emissions are greater than or equal to 4 TPY of VOCs

, operators shall submit a Leak Detection and Repair (LDAR) Protocol. The fugitive emission monitoring in the LDAR Protocol shall be no less frequent than quarterly, and may consist of Method 21, infrared

camera, audio

- visual

- olfactory (AV O) inspection s, or some combination thereof and must be approved by

the Division

. A pr oposed LDAR Protocol consisting of only AVO inspections will not be accept e d by the

Division.



## Well Completions

Operators shall submit applications to perform well completions using Best Management Practices. One permit will be issued to each company tha t drills and completes wells within the Upper Green River

Basin . The permits will be modeled after those issued to companies completing wells in the Jonah and Pinedale Anticline Development Area an d Concentrated Development Area . An example of a well completions or “Green Completions” permit is available on the AQD website, http://deq.state.wy.us/aqd or a copy may be obtained by contacting the Wyoming Air Quality Division at (307) 777

- 739 1.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 23 of 76



## Presumptive BACT Requirements for UGRB Facilities (cont.)

Produced Water Tanks

New Facilities

PAD Facilities Upon FDOP, VOC and HAP emissions from all active produced water tanks shall be controlled by at least 98%.

Single Well Facilities

Within 60

- days of FDOP, at sites where flashing emissions must be controlled by at least 98%, VOC and HAP emissions from all active produced water tanks shall be controlled by at least 98%.

Modified Faci lities

PAD Facilities Upon modification, VOC and HAP emissions from all new active produced water tanks shall be controlled by at least 98%.

Within 60

- days of modification, existing open

- top, active, produced water tanks shall be

taken out of service for use as active produced water tanks. All active produced water tanks shall be closed top and shall have VOC and HAP emissions controlled by at least

98%.

New and Modified Facilities

Open

- top or blow down tanks shall not be used as active produced water ta nks but may be used for blow down or for temporary storage during emergency or upset conditions, such as spare tanks at facilities connected to liquids gathering systems, and do not have to be tied into 98% control systems.

Removal of produced water tan k emissions control may be allowed upon approval. (S ee Flashing, Page 19 )C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 24 of 76



## Presumptive BACT Requirements for UGRB Facilities (cont.)

Blowdown/Venting

Best Management Practices (BMP) and information gathering requirements will be incorporated into permits for new and modified facilities.

BMP: During manual and autom ated blow down/venting episodes associated with liquids unloading, wellbore depressuriza tion in preparation for maintenance or repair, hydrate clearing, emergency operations, equipment depressurization, etc., associated VOC and HAP emissions shall be minimized to the extent p racticable. During manual blow down or venting, personnel

shall rema in on site to ensure minimal gas venting occurs.

Information Gathering: Specific recordkeeping and reporting requirements will be established during the permitting process and will include estimates of associated regulated air pollutants, reasons for epi sodes, durations of episodes, steps taken to minimize emissions and descriptions of

emission estimation methods.



## Emission Sources without Presumptive BACT requirements

For uncontrolled sources emitting greater than or equal to 4 TPY VOC that do not have P

- BACT requirements, a BACT analysis shall be filed with the permit application for the associated facility.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 25 of 76



## Presumptive BACT Requirements for JPAD /NPL Facilities

Flashing

For the purpose of determining flashing emissions all vapor streams containing VOC or HAP components from all storage tanks (e.g., oil, condensate, produced water with oil or condensate carryover) and all separation vessels (e.g., gun barrels, production a nd test separators, production and test treaters, water knockouts, gas boots, flash separators, drip pots, etc.) at a facility which are or may be vented to the atmosphere shall be considered.

New Facilities Upon FDOP, VOC and HAP flashing emissions shal l be controlled by at least 98%.

Modified Facilities Upon modification, all new and existing VOC and HAP flashing emissions shall be controlled by

at least 98%.

New and Modified Facilities Condensate and oil tanks that are on site for use during emergency or upset conditions, such as spare tanks at facilities connected to liquids gathering systems, are not subject to the 98% control requirements.

T he removal of flashing emissions control devices may be allowed upon approval after one year

if VOC flashing emissions have declined to less than, and are reasonably expected to remain

below 4 TPY.



## Dehydration Units

New Facilities Upon FDOP, all VOC and HAP emissions from dehydration unit process vents shall be controlled by at least 98%. No control r emoval will be allowed.

Modified Facilities Upon modification, all VOC and HAP emissions from new and existing dehydration unit process vents shall be controlled by at least 98%. No control removal will be allowed.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 26 of 76



## Presumptive BACT Requirements for JPAD /NPL Facilities (cont.)

Pneumatic Pumps

New Facilities Upon FDOP, VOC and HAP emissions associated with the discharge streams of all natural gas

operated pneumatic pumps shall be controlled by at least 98% or the pump discharge streams shall be routed into a closed loop system (e.g., sales line, collection line, fuel supply line).

Modified Facilities Upon modification, VOC and HAP emissions associated with the disc harge streams of all new and existing natural gas

- operated pneumatic pumps shall be controlled by at least 98% or the pump discharge streams shall be routed into a closed loop system.

New and Modified Facilities For pneumatic pump emissions controlled by a combustion unit used to control flash emissions which may be removed, the control method for pump emissions will be evaluated upon request for approval to remove the combustion unit. ( S ee Flashing, Page 25 )



## Pneumatic Controllers

New Facilities Upon F DOP, natural gas

- operated pneumatic controllers shall be low* or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Modified Facilities Upon modification, new natural gas

- operated pneumatic controllers shal l be low or no

- bleed controllers or the controller discharge streams shall be routed into a closed loop system.

Within 60

- days of modification, existing natural gas

- operated pneumatic controllers shall be replaced by or converted to low or no

- bleed cont rollers or the controller discharge streams shall be routed into a closed loop system.

* low bleed devices vent less than 6 cfhC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 27 of 76



## Presumptive BACT Requirements for JPAD /NPL Facilities (cont.)

Produced Water Tanks

New Facilities Upon FDOP, VOC and HAP emissions from all active produced water tanks shall be controlled by at least 98%.

Modified Facilities Upon modification, VOC and HAP emissions from all new active produced water tanks shall be controlled by at least 98%.

Within 60

- days of modification, existing open

- top, active, produced water tanks shall be taken out of service for use as active produce d water tanks. All active produced water tanks shall be closed top and shall have VOC and HAP emissions controlled by at least 98%.

New and Modified Facilities Open

- top or blow down tanks shall not be used as active produced water tanks but may be used

f or blow down or for temporary storage during emergency or upset conditions, such as spare tanks at facilities connected to liquids gathering systems, and do not have to be tied into 98% control systems.

Removal of water tank emissions control may be allo wed upon approval. (S ee Flashing, Page 25 )



## Fugitives

For new and modified facilities where fugitive emissions are greater than or equal to 4 TPY of VOCs, operators shall submit a Leak Detection and Repair (LDAR) Protocol. The fugitive emission monitori ng in the LDAR Protocol shall be no less frequent than quarterly, and may consist of Method 21, infrared

camera, audio

- visual

- olfactory (AV O) inspections, or some combination thereof and must be approved by

the Division. A proposed LDAR Protocol consistin g of only AVO inspections will not be accepted by the

Division

.



## Well Completions

Operators shall submit applications to perform well completions using Best Management Practices. One permit will be issued to each company that drills and completes wells within the UGRB. The permits will be modeled after those issued to companies comple ting wells in the Jonah and Pinedale Anticline Development Area. An example of a well completions or “Green Completions” permit is available on the AQD website, http://deq.state.wy.us/aqd or a copy may be obtained by contacting the Wyoming Air Quality Division at (307) 777

- 7391.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 28 of 76



## Presumptive BACT Requirements for JPAD / NPL Facilities (cont.)

Blowdown/Venting

Best Management Practices (BMP) and information gathering requirements will be incorporated into permits for new and modified facilities

.

BMP: During manual and automated blow down/venting episodes associated with liquids unloading, wellbore depressuriz ation in preparation for maintenance or repair, hydrate clearing, emergency operations, equipment depressurization, etc., associated VOC and HAP emissions shall be minimized to the extent practicable. During manual blow down or venting, personnel

shall re main on site to ensure minimal gas venting occurs.

Information Gathering: Specific recordkeeping and reporting requirements will be established during the permitting process and will include estimates of associated regulated air pollutants,

reasons for e pisodes, durations of episodes, steps taken to minimize emissions and descriptions of

emission estimation methods.



## Emission Sources without Presumptive BACT requirements

For uncontrolled sources emitting greater than or equal to 4 TPY VOC that do not have P

- BACT requirements, a BACT analysis shall be filed with the permit application for the associated facility.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 29 of 76



## Determining Presumptive BACT Flashing Emissions

Flashing losses occur when produced liquids (crude oil or condensate) are exposed to temperature increases or pressure drops as they are transferred from production vessels to other vessels or to atmospheric storage tanks. For purposes of this guidance, the term “ flash emissions ” r efers to VOC and HAP pollutants associated with entrained natural gas vapors released to the atmosphere from hydrocarbon liquids in surface production equipment. This production equipment may include gun barrels, separators, treaters, produced water tanks , gas drips, freewater knockouts, etc. In addition to flash emissions, vessels containing hydrocarbon liquids also have emissions associated with working and breathing (also called standing) losses. These are vapors displaced from oil or condensate due t o evaporation and agitating.

Use the following steps to determine projected potential flashing and working/breathing losses:

STEP 1: 30

- days after the First Date of Production calculate the average daily condensate or oil

production

. Example: Well produ ced 600 BBL during the first 30

- days after the First Date of Production. average daily condensate/oil production = 600 BBL ÷ 30 days = 20 BPD

STEP 2: Calculate the projected first year annualized average daily condensate/oil production rate

by multiplying the average 30

- day rate times 0.6. This effectively results in a first year, annualized daily production rate which is 20% of the initial production rate. Additionally, this effectively accounts for an 80% decline in daily production by the end of the first year. (described in more detail on page 40)

Example: projected first year, annualized average daily oil/condensate production = 20 × 0.6 = 12

BPD

If the expected decline rate is less than 80%, then the expected decline rate should be used. Using an expected decline rate > 80% requires pre

- approval from the Division.

STEP 3: Use an approved flash emissions model or direct measurement of tank emissi ons to determine

projected first year VOC and HAP emissions associated with the projected first year average daily production rate

.

Actual flash emissions are determined the same as projected potential emissions except that the actual average daily conden sate or oil production rate is used rather than a projected production rate.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 30 of 76



## Determining Presumptive BACT Flashing Emissions

Several methods are available to calculate or measure flash emissions with s ome being more accurate than others. Even through working/breathing/flashing losses are almost always mixed together and exit
from a common vent at the same time, some methods only calculate working and breathing losses and
some only calculate flashing lo sses. Some methods will calculate all three types of emissions
simultaneously. Each method has specific constraints. For whichever method used, all supporting data
used to calculate the emissions, including identification of the calculation method, desc ription of
sampling methods and copies of lab sampling analyses shall be provided with the emissions estimate.

Method Emissions

Calculated Comments

1 Direct measurement working, breathing,

flash Sampling and lab analysis required. Results are relatively

accurate.

2 Process Simulator flash only i.e. PROMAX, HYSIM, HYSIS Software is expensive but results are accurate when based

on site

- specific sampling and lab analysis

. 3 API E&P TANKS Software

V 2.0 working, breathing,

flash Requires site specific sampling. Not as accurate as more

expensive process simulators and no longer supported by the software producer (American Petroleum Institute).

4 Laboratory

measurement of the

Gas

- Oil

- Ratio (GOR) from
a pressurized liquid
sample flash only This is a direct laboratory analysis of the flash vapors emitted from a pressurized oil/condensate sample.

5 EPA TANKS 4.0.9d working, breathing
only Program distributed by the EPA through their website at

http://www.epa.gov/ttn/chief/efpac/efsoftware.html

Extended hydrocarbon liquids analyses used for model input shall be no older than three years. Composite analyses may be used as input. These are averaged extended hydrocarbo n compositions based on samples from at least five nearby wells producing from the same formation and under similar conditions (± 25° psig) as the well being permitted. Analyses used as the basis for the average shall be no

older than three years.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 31 of 76



## Determining Presumptive BACT Dehydration Unit Emissions

Dehydration units use glycol (TEG, DEG or EG) to absorb water from produced gas before it is introduced into gas sales or collection lines. Upon contact with wet gas, “lean” glycol absorbs water and other liquids. It is then considered “rich”. To remove impurities, or regenerate, the rich glycol is routed through a glycol flash separator and/or a reboiler. During flash separation and reboiling, water and hydrocarbon vapors containing VOC and HAP pollutants are released from the rich glycol. These are

t hen discharged to the atmosphere from the dehydration unit process vents.

Use the following steps to determine projected potential dehydration unit emissions :

STEP 1 : Once a new well has produced for 30

- days after the First Date of Production, determine

the average daily gas production rate. Example: Well produced 100 MMCF during the first 30

- days after the First Date of Production average daily gas production = 100 MMCF ÷ 30 days = 3.3 MMCFD

STEP 2 : Calculate the projected first year, ann ualized average daily gas production rate by

multiplying the initial average 30

- day rate times 0.6. This effectively results in a first year, annualized daily production rate which is 20% of the initial production rate. Additionally, this effectively cal culates an 80% decline in daily production by the end of the first year. (described in more detail on page 41.)

Example: projected first year, annualized average daily gas production = 3.3 × 0.6 = 2.0

MMCFD

STEP 3 : Use GRI

- GLYCalc V3.0 or higher or other method approved by the Division with the

projected first year, annualized average daily production rate to determine potential,

annualized uncontrolled VOC and HAP emissions from the dehydration unit process

vents

. Process vents include reboiler still vents, glycol flash separators and still vent

condensers.

Model input: 1) An extended hydrocarbon analysis of wet gas sampled upstream of the reboiler contact tower. Or, a composite extended hydrocarbon analysis may be used. A composite analysis is the average composition from at least five nearby wells producing from the same formation as the new well and under the same or very similar separator pressure and temperature conditions. Samples shall be no older than five years. 2) The projected firs t year average daily gas production rate (MMCFD). 3) Average, actual equipment operational parameters, including wet gas temperature and pressure, dry gas water content, glycol flash separator temperature and pressure, stripping gas source and rate and

ave rage operating parameters of emission control equipment. 4) The maximum lean glycol circulation rate (gpm) for the glycol circulation pump in use. Maximum circulation rates for the most commonly used Kimray Model pumps are listed in TABLE 1

.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 32 of 76



## Determining Presumptive BACT Dehydration Unit Emissions (cont.)

TABLE 1

KIMRAY GLYCOL PUMP RATES

Model # Capacity (gpm) Working Pressure (psi)

min max min max

3154 PV 0.05 0.22 100 1500

1715 PV 0.13 0.67 300 1500

4015 PV 0.2 0.67 300 1500

9015 PV 0.45 1.5 300 1500

21015 PV 1.1 3.5 400 1500

45015 PV 2.77 7.5 400 1500

4015 LP 0.13 0.33 100 500

2015 SC 0.13 0.33 100 500

5015 SC 0.2 0.83 100 500

10015 SC 0.37 1.67 100 500

20015 SC 1 3.33 100 500

D ata from Kimray O&G Equipment and Controls Catalog

Actual dehydration unit emissions are determined the same as projected potential emissions except
that the actual average daily gas production rate is used in the GlyCalc model rather than a projected
production rate.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 33 of 76



## BACT for Flashing Emissions

The following control systems or devices are accepted by the Division as meeting BACT for flash

emissions:

1) A vapor recovery device that is designed and operated and may be demonstrated to reduce the mass content of VOC and total HAP emissions in the vapors vented to the device by at least 98% by weight. 2) An enclosed, smokeless combustion device or flare that is designed and operated and may be

demonstrated to reduce the mass content of VOC and total HAP emissions in the vapors vented to the device by at least 98% by weight. 3) Any other control device or configuration that can be demonstrated to reduce the mass content of total HAP and VOC in the process gases vented to the device or configuration by at least 98% by weight. 4) Monitoring and recordkeeping which will demonstrate continuous and effective emission control are required upon start up of the control system. For a combustion device this may be a thermocouple

an d continuous recording device or any other equivalent device to detect and record the presence of the pilot flame, or a combustion chamber temperature recorder/monitor. The monitoring/recording requirements become enforceable permit conditions. 5) Emissio ns control equipment, systems or devices, all vent lines, connections, fitting, valves, relief valves, thief hatches or any other appurtenance employed to contain and collect vapors and transport them to the emission control system or device, shall be main tained and operated during any time a well is producing such that the emissions are controlled at all times.

CAUTION : Total emissions from any facility or source shall not exceed major source levels prior to emission control installation. Major source l evels are 10 TPY of any single HAP, 25 TPY of any combination of HAP or 100 TPY of any regulated pollutant. Flash emissions prior to control installation will be determined using approved emission models or methods based on actual reported production and operating conditions. Reported production includes that sold during well completion activities which are reported to the WOGCC. Flash emissions are directly proportional to production rates, provided operational parameters remain consistent, so it is acc eptable to prorate emissions based on production.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 34 of 76



## BACT for Dehydration Unit Emissions

Other emission control systems or devices than those previously discussed may be used upon approval by

the Division to meet BACT requirements for emissions from dehydration unit process vents (reboiler still vents and vents from glycol flash separators or glycol flash tanks). In order to be approved, the operator must provide a demonstration certifying the sys tem or device will reduce the mass content of total HAP and VOC in the process gases vented to the device or configuration by at least 98% by weight.

Emissions control equipment, systems or devices, all vent lines, connections, fitting, valves, relief val ves, hatches or any other appurtenance employed to contain and collect vapors and transport them to the emission control system or device, shall be maintained and operated during any time a well is producing

such that the emissions are controlled at all ti mes.

Monitoring and recordkeeping which will demonstrate continuous and effective emission control are required upon start up of the control system. For combustion devices this may be a thermocouple and continuous recording device for the pilot flame or any other equivalent device to detect and record the presence of the pilot flame. A temperature recorder/monitor might be used to demonstrate sufficient heat of combustion or a continuous, wind

- up chart recorder might be used to demonstrate continual ope ration by measuring and recording temperature or pressure parameters.

REMINDER : Dehydration units at oil and gas production facilities may be subject to additional NESHAP requirements under 40 CFR part 63, subpart HH. It is the operator’s responsibility to comply with all applicable requirements of the NESHAP regulations.

CAUTION : Total emissions from any facility or source shall not exceed major source levels prior to

emission control installation. Major source levels are 10 TPY of any single HAP, 25 TPY of any combination of HAP or 100 TPY of any regulated pollutant. Dehydration unit emissions occurring prior to the installation of required controls will be determined using the GRI

- GLYCalc model o r other method approved by the Division based on the maximum lean glycol circulation rate and the actual reported gas production rate including any gas which was routed through the dehydration unit during well completion operations.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 35 of 76



## BACT for Sources without P

- BACT Requirements

For emission sources without PRESUMPTIVE BACT requirements, BACT shall be addressed when the uncontrolled source emits greater than or equal to 8 TPY VOC or greater than or equal to 5 TPY total

HAP emissions.

For these sources EITHER the emission source will be controlled using BACT OR a BACT cost analysis will be performed and submitted with the application showing either:

control is not technically feas ible (i.e., due to physical constraints the emissions cannot be controlled)

OR control is not economically reasonable (i.e., based on a control cost analysis the “cost to control per ton of pollutant reduced” is uneconomical).

CAUTION: BACT may be required at lower levels and for other emissions and emission sources than

those stated in this guidance, but as a minimum, BACT shall be considered when equal to or above these guidance emission levels. For example, operators installing pumping

unit engines according the APP=NOI process might be asked to submit a BACT analysis for the engine.

Multiple pieces of the same type of equipment are considered one emission source for permitting

purposes. For example, there are five oily rag burners at a fac ility. Uncontrolled emissions from the five burners shall be aggregated for permitting purposes. If total uncontrolled VOC emissions from the five burners are less than 8 TPY, BACT requirements are met with no control. If total uncontrolled emissions

f rom the five burners are greater than or equal to 8 TPY VOC or greater than or equal to 5 TPY total HAP, emissions from all five burners shall be reduced to less than 8 TPY total VOC and less than 5 TPY total HAP in order to meet BACT requirements or the a pplicant shall demonstrate controlling the emissions is not economically reasonable nor technically feasible.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 36 of 76



## Permit Applications

For JPAD /NPL facilities, the application submittal process is different from the process for CDA and Statewide facilities. See Page 45 for JPAD /NPL application instructions.

For UGRB

, CDA

, and Statewide facilities, unless a permit is issued prior to start up, a C6 S2 Oil & Gas Production Facilities permit application shall be filed within 90

- days after the First Date of Production for a new facility or Date of Modification of an existing facility. The application notifies the AQD that the new or modified facility has begun operation. It describes the facility process, equipment and associated emissions/emissions controls and serves as a form of certification by the owner that the Presumptive BACT requirements have been met.

Whether the application is being filed after c onstruction under the Presumptive BACT process or prior to construction, the appropriate application forms depend upon the facility equipment and operating scenario. A complete application includes the following appropriate forms:

A cover letter stating the purpose of the application A written process description and process diagram for the facility including each air emission source and the operational parameters of each source ( examples on pages 32 & 33) The appropriate application forms AQD

- OG0 Iden tification of application type ( application or NOI = application ) AQD

- OG00 Completeness checklist AQD

- OG1 Application Cover Sheet AQD

- OG2 Equipment List AQD

- OG3 Storage Tanks, Pressurized Vessels & Pneumatic Pumps AQD

- OG4 Dehydration Units AQD

- OG 5 Pumping Unit Engines AQD

- OG6 Emission Summary AQD

- OG7 Notice of Installation AQD

- OG8 Multiple Facilities AQD

- OG10 BACT cost analysis

Explanations or demonstrations of all methods used to calculate or estimate emissions for each emission source, in cluding controlled and uncontrolled sources. Emission calculation methods

are described later. All applicable and required attachments noted on the forms, including Input and output for emission models/software/process simulations Equipment manufacturer’s emissions information Laboratory analyses used for emission models/software/process simulations or calculations including a description of sampling procedures and handling, sampling locations, sampling location parameters (i.e., pressure and temperature at sampling port) Any additional attachments or information necessary for complete review of the applicationC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 37 of 76



## Permit Applications (cont.)

Download application forms from the AQD website:



## http://deq.state.wy.us/aqd/oilgas.asp

Contact the Wyoming Air Quality Division at (307) 777

- 7391

Make written request to: Wyoming Department of Environmental Quality Air Quality Division

Herschler Building, 2

- E

122 West 25 th Street Cheyenne, WY 82002 attn: O&G NSR Permitting

or

Wyoming Department of Environmental Quality

Air Quality Division 152 North Durbin Street, Suite 100 Casper, WY 82601 attn: O&G NSR Permitting

For facilities constructed o r modified under the Presumptive BACT process submit EITHER 1 paper copy with original signature and 1 electronic copy OR 3 paper copies (one with original signature) of the complete C6 S2 application within 90

- days of the First Date of Production to the address below.

For all facilities where emissions are known prior to construction submit EITHER 1 paper copy with original signature and 1 electronic copy OR 3 paper copies (one with original signature) of the complete C6 S2 application prior to c onstruction to the address below.

NSR Program Manager / attn: O&G Production Facilities Department of Environmental Quality Air Quality Division Herschler Building, 2

- E

122 West 25 th Street Cheyenne, WY 82002

The preferred method for filing the application is 1 paper copy with 1 electronic copy

.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 38 of 76



## Permit Applications (cont.)

Example Process Diagram & Description

EXAMPLE: Air emission sources in the diagram are the condensate storage tank from which vapors are vented to the atmosphere, the dehydration unit reboiler still vent and the three natural gas

- fired process

heaters. P roduced fluids are directed to the 3

- phase separator for separation of condensate/water/gas. Wet gas is directed to the TEG dehydration unit for drying. Separated condensate and water are routed to the appropriate tanks for storage prior to being hauled from location via truck. Produced gas is used as burner fuel. Reboiler vapors and flash emissions are vented to the atmosphere along with S/W/B losses

from the condensate tank. 500

- bbl

Produced

Water Tank

1000 BWPD 400

- bbl
Condensate

Tank

20 BPD 4.0 MMCFD
TEG Dehydration

Unit 3

- Phase Separator 500 psig
85 oF

Separated Condensate/ Water to

Storage Tanks Dry Gas to Sales 1.0 MMBtu/hr

Reboiler Heater Wet Gas to Dehy

Well Fluids to Separator Reboiler Vapors to Atmosphere Flash and S/W/B Vapors to Atmosphere

0.50 MMBtu/hr

Tank Heater

Truck Loadout (20 BPD)C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 39 of 76



## Permit Applications (c ont.)

Example Process Diagram & Description

EXAMPLE: Total well fluids from four wells flow to the 2

- ph HP separators. Wet gas from the HP separators flows to the four dehydration units. Separated fluids from the 2

- ph HP separators flows to the

3

- ph LP separators. Separated condensate and water f lows from the 3

- ph LP separators to the storage

tanks. Gas released in the 3

- ph separators is routed to the condensate storage tanks. Tank vapors, including tank flash, gas from the 3

- ph LP separators and S/W/B vapors are collected and directed to a

30

- f oot smokeless combustor. The temperature of the combustor is continually monitored and recorded using a SCADA system. Reboiler still vents vapors flow through condensers. Condensed liquids are pumped to the condensate storage tanks. Non

- condensable vap ors flow to the 20

- foot Mini

- Combustors. The temperature of the Mini

- combustors is continually monitored and recorded using a SCADA system. Pneumatic heat trace pumps operate 6 months per year using produced gas from the HP separators to operate. Vent l ines from the pumps are routed into the condensate dump lines from the LP separators.

The process diagram does not need to be computer generated. A simple hand sketch is sufficient as long as the required information is included. The diagram does not n eed to be drawn to scale and does not need to represent the exact position of production equipment at the facility as long as the process description and operating scenario are clearly defined. Well 1 HP 2

- Phase Separators with 0.5
MMBtu/hr heaters 600 psig, 80 deg F

400

- bbl
Condensate Tank 400

- bbl
Condensate Tank

Combustor Tank Flash, LP Separator Flash, S/W/B losses

Mini

Combustor

4.0 MMCFD
TEG Dehydration

Unit with 0.085
MMBtu/hr

reboiler 6.0 MMCFD
TEG Dehydration

Unit with 0.75
MMBtu/hr

reboiler Mini

Combustor Separated Condensate & LP Separator Flash

Pn eumatic Heat Trace Pumps Condenser 20 psig, 130 deg F

LP 3

- Phase Separators 60 psig, 120 deg F

Separated

Water Truck Loading

Well 2 Well 3 Well 4

Separated Wet Gas

Dry gas to Sales Pipeline

400

- bbl Water Tank 400

- bbl Water Tank Separated Liquids

Condenser 20 psig, 130 deg F 6.0 MMCFD
TEG Dehydration

Unit with 0.5
MMBtu/hr

reboiler 10.0 MMCFD
TEG Dehydration

Unit with 0.75
MMBtu/hr

reboilerC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 40 of 76



## Permit Ap plications (cont.)

Upon receiving the application, the AQD sends a receipt letter to the applicant. The application is logged into the AQD tracking system and assigned a reviewing engineer. The engineer has up to 30

- days to perform a completeness review to ensure adequate and correct information has been filed. If the application is deemed incomplete the engineer will notify the applicant and request further information. Upon completeness the engineer has 60

- days to complete a technical review, write a n application analysis and make any recommendations. During this process the decision to issue a permit or waiver takes place. If the decision is to issue a permit, the proposed permit, including compliance requirements, is published for a mandatory 30

- d ay public comment period. If no comments are received the permit is issued once the public comment period ends. If comments are received these are addressed by the AQD. It is possible comments will warrant a public hearing. When this is the case, a fin al permit may be denied or delayed.

An hourly fee will be assessed for the time it takes AQD personnel to process the application. A bill will be sent to the applicant when the process is complete. Billing is handled as follows:

Initial billing is ass essed when a proposed permit is sent to public notice. Initial billing shall be paid prior to issuance of the final permit.

Final billing is assessed for waivers and permits after these are issued.

Contact the Division for the current hourly rate.

NOTE: The Presumptive BACT permitting process may not be used for sour gas (H 2 S) production facilities unless the only emissions of H 2 S will be those associated with fugitive losses from valves, fittings, surface piping and pneumatic devices, etc. If ther e will be H 2 S emissions associated with vented gas or tank vapors or if sour gas will be flared the applicant shall contact the Division for permitting guidance prior to construction.

NOTE: NO internal combustion compressor engines or generator engines m ay be installed under the Presumptive BACT process. No pumping unit engines greater than 50

- Hp or with nitrogen oxide (NO X ) emissions greater than 5 TPY may be installed under the Presumptive BACT permitting process.

Such engines shall be permitted pri or to installation.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 41 of 76



## Permit Applications (cont.)

Notice of Installation (NOI)

For some O& G production facilities or equipment, associated air emissions are considered relatively insignificant by the AQD. In these cases the NOI form, FORM AQD

- OG7 , serves as a complete C6 S2 permit application.

The NOI can be used for facilities such as sing le wellsites, consisting of only a wellhead or perhaps a separation unit, where no produced fluids are stored or dehydrated. Instead, the produced fluids are routed directly from the wellhead or separation vessels into a sales line, collection system or t o a separate facility for treatment, storage and sales. The only emissions at this type of facility would be fugitive emissions from equipment leaks and fittings, or NO X and CO emissions associated with small natural gas fired process heaters.

The NOI ma y be used as a complete permit application ONLY if ALL of the following apply to the facility owner: There are no hydrocarbon liquids storage tanks. There are no dehydration units. There are no pressurized vessels from which hydrocarbon vapors are vented t o the atmosphere other than during upset or emergency conditions. There are no internal combustion pumping unit engines ≥ 50 HP.

There are no H 2 S emissions from the facility other than those associated with fugitive leaks from process components and surfac e piping.

There are no SO 2 emissions associated with the combustion of sour gas.

REMINDER for Pumping Unit Engines : Pumping unit engines at oil and gas production facilities are subject to additional NESHAP requirements under 40 CFR part 63, subpart ZZZZ

. Also, engines at these facilities may be subject to additional NSPS requirements under 40 CFR part 60, subpart JJJJ based on engine manufacture date. It is the operator’s responsibility to comply with all applicable requirements of

the NSPS and NESHAP regulations.

Using the NOI as notification of equipment replacements and changes

The NOI may be used for notification of equipment change outs or replacements, provided the changes will not significantly increase permitted emissions, if at all. For example, use the NOI as notification of replacement of a TEG dehydration unit with one having a higher design rating but with the same model glycol pump as previously permitted, or higher rated reboiler burner. Increased emissions associated with the larg er burner would be considered insignificant and there would be no emissions increase associated with the larger dehy as long as there is no change in the glycol pump model or wet gas throughput.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 42 of 76



## Permit Applications (cont.)

Another example would be to use the NOI as notification of the installation of additional production tanks at a previously permitted facility provided throughput to the current and additional tanks is the same as or less than the previously permitted throughput and provided the v ent lines of the new tanks are tied into emission control devices if such was required for the existing tanks.

The NOI may be used as notification of the installation of different process heater, such as replacing a 0.5

MMBtu/hr line heater with a 0.75 MM Btu/hr line heater.

Examples are illustrated on the next page.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 43 of 76



## Permit Applications (cont.)

Examples of cases where the NOI may be used as a complete C6 S2 permit application or as notification of equipment changes

flowing well

separator produced fluids to gathering system or separate facility gas to sales or collection system process heater

electric pumping unit produced oil to gathering system or separate facility

produced water 

## 1

2

3

<50 Hp & < 5 TPY NOx

pumping unit with natural

gas

- fired engine SOUR fluids to treater heater

treater s our production to gather ing

system or separate facility



## 4 A storage tank is added to an existing facility. Tank throughput at the facility is no greater than previously permitted throughput. If existing tanks are connected

to an emission control device,

the new tank shall also be

connected to the control

device. install new tank SWEET gas burner fuelC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 44 of 76



## Permit Applications (cont.)

How to obtain NOI Form AQD

- OG7

The link to electronic forms on the AQD website is



## http://deq.state.wy.us/aqd/oilgas.asp

Contact the Wyoming Air Quality Division at 

## (307) 777

- 7391

Make written request to: Wyoming Department of Environmental Quality
Air Quality Division
Herschler Building, 2

- E

122 W est 25 th Street Cheyenne, WY 82002

When/where to file a NOI

Within 60

- days of the First Date of Production , equipment change out, equipment replacement or
equipment addition submit EITHER 1 paper copy with original signature and 1 electronic copy OR 3 paper copies (one with original signature) of the NOI form to:

NSR Pro gram Manager / attn: O&G Production Facilities
Department of Environmental Quality
Air Quality Division
Herschler Building, 2

- E

122 West 25 th Street Cheyenne, WY 82002

The preferred method for filing the NOI is 1 paper copy with 1 electronic copy.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 45 of 76



## Specific Requirements for JPAD /NPL Permit Applications

For the JPAD /NPL , the Presumptive BACT permitting process varies from that for all other statewide

areas.

Unlike the Presumptive BACT permitting process for UGR B, CDA

, and STATEWIDE facilities, the permitting process for JPAD /NPL facilities does not require the determination of projected, potential emissions prior to application filing. Instead, emissions meeting the BACT requirements shall be in place upon the First Date of Production at all new and modified facilities. A C6 S2 application is filed to notify the AQD of the start up of a new facility or the modification to an existing facility. The application describes new, modified and future well/equipment installations along with the associated, controlled and

uncontrolled e missions and serves as a form of certification by the owner that Presumptive BACT requirements for emission controls and control device monitoring have been and will be met.

A complete C6 S2 application, including all appropriate forms, shall be filed for within sixty

- days of the

First Date of Production or modification for:

all new single well facilities

all new PAD facilities modifications to existing single or PAD facilities

If a facility has been previously permitted and the permit contains conditions authorizing additional equipment and wells to be added according to the July 28, 2004 Guidance Addendum, a complete application may be submitted using the AQD Pinedale

- 1 Form

.

Any additional attachments or information necessary for complete review of the application

Emissions reported in the application shall be based on projected rates for new wells and current average production rates at the time of application filing for exi sting wells. Higher production rates may be used if the applicant wants to permit for production/emission increases.

NOTE: At facilities with a permit authorizing the addition of future wells, the authorization becomes

invalid if no wells are added to t he facility within 24 months after receipt of the permit or if the addition of the planned wells is discontinued for a period of 24 months or more. The permit for the existing wells

remains valid.

For facilities requiring a permit prior to start up of op erations, emissions reported in the application should be based on expected production rates. Higher production rates may be used if the applicant wants to permit for production/emissions increases.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 46 of 76



## Specific Requirements for JPAD /NPL Permit Applications

How to obtain C6 S2 application, AQD Pinedale

- 1 and NOI forms

Download electronic forms from the AQD website at:



## http://deq.state.wy.us/aqd/oilgas.asp

Contact the Wyoming Air Quality Division at 

## (307) 777

- 7391

Make written request to:
Wyoming Department of Environmental Quality
Air Quality Division
Herschler Building, 2

- E

122 W est 25 th Street Cheyenne, WY 82002
attn: O&G NSR Permitting

When/where to file C6 S2 permit applications, AQD Pinedale

- 1 and NOI forms

For facilities where emissions are known prior to construction submit EITHER 1 paper copy with original
signature and 1 electronic copy OR 3 paper copies (one with original signature) of the com plete C6 S2
application PRIOR to construction to the address below.

For facilities constructed or modified under the Presumptive BACT process submit EITHER 1 paper copy

with original signature and 1 electronic copy OR 3 paper copies (one with original sig nature) of the
complete C6 S2 application within 60

- days of the First Date of Production to the address below.

For facilities with additions authorized under the July 28, 2004 Guidance Addendum, use the AQD

Pinedale

- 1 Form. Submit EITHER one electronic a nd one paper copy with original signature OR three paper copies (one with original signature) within 60

- days of the First Date of Production to:

NSR Program Manager / attn: O&G Production Facilities
Department of Environmental Quality
Air Quality Division
Herschler Building, 2

- E

122 W est 25 th Street Cheyenne, WY 82002

The preferred method for filing the application is 1 paper copy with 1 electronic copy.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 47 of 76



## The 0.6 decline factor ....

The first year daily production rates are represented by the jagged line BOX 1 . The area under the line represents the total actual production volume for the first year. It is difficult to calculate the total volume under the jagged line so it is smoothed out BOX 2 using statistical methods.

BOX 1 BOX 2

BOX 3 BOX 4

The smoothed curve is “straightened” out in BOX 3 , then “leveled” out in BOX 4 . Now the total production for the first year is represented by the area under the line in BOX 4 which is easily calculated. Production curves from a large sampling of Wyoming wells indicate the average well declines by 80% during the first year. That 8 0% decline is represented by the level line in BOX 4 after the first 30

- day average production rate is multiplied by 0.6. For the first month the well makes an average 3.333 MMCFD. With 80% decline during the first year, the well will make 0.667 MMCFD at the end of the first year (3.333

- 0.8(3.333) = 0.667). Then the average daily production rate over 365 days is (3.333 + 0.667)/2 = 2.0 MMCFD which is the same as 3.333

× 0.6 = 2.0.

start up 365 days

MMCFD

start up 365 days

2.0 MMCFD start up 365 days

start up 365 days

MMCFD

T he “smoothed” curve in BOX 2 is
“straightened” out using mathematical

methods. EXAMPLE

- actual daily gas production rate vs time

Actual production during the first year is represented by the area
under the jagged line which ultimately turns out to be ≈ 730

MMCF. The jagged line representing daily production is “smoothed” out using

statistical methods.

“leveled ” out, projected daily gas production rate vs time

Total projected production for the first year is represented
by the area under the straight line
2 MMCFD × 365 days = 730 MMCF

First year projected emissions are based on 730 MMCF of
produced gas.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 48 of 76



# APPENDIX A

FORMSC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 49 of 76

Form AQD

- OG0 Application Identifies the submittal as a C6 S2 O&G Production Facilities Permit ApplicationC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 50 of 76

Form AQD

- OG0 NO I Identifies the submittal as a C6 S2 O&G Production Facilities Notice of Installation = ApplicationC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 51 of 76

Form AQD

- OG00 Completeness ChecklistC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 52 of 76

Form AQD

- OG1 Application CoversheetC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 53 of 76

Form AQD

- OG2 Equipment ListC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 54 of 76

Form AQD

- OG2 Equipment List, Page 2C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 55 of 76

Form AQD

- OG3 Storage Tanks, Pressurized Vessels & Pneumatic PumpsC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 56 of 76

Form AQD

- OG4 Dehydration UnitsC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 57 of 76

Form AQD

- OG5 Pumping Unit EnginesC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 58 of 76

Form AQD

- OG6 Emiss ion SummaryC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 59 of 76

Form AQD

- OG7 Notice of InstallationC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 60 of 76

Form AQD

- OG8 Multiple FacilitiesC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 61 of 76

Form AQD

- OG9 Change of Ownership

Form AQD

- OG10 BACT Cost AnalysisC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 62 of 76C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 63 of 76



# APPENDIX B

EMISSION CALCULATIONSC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 64 of 76

Emissions from processes and equipment which shall be accounted for and reported by applicants FOR

ALL O&G PRODUCTION FACILITIES are:

Emission Unit or Process Associate d Emissions

storage tanks (flashing & S/W/B losses) VOC HAP H 2 S

pressurized vessels (flashing losses) VOC HAP H 2 S

dehydration units (reboiler still vents & glycol flash tanks) VOC HAP

natural gas fired burners, heaters, flares NO X CO SO 2 natural gas operated pneumatic pumps VOC HAP H 2 S

fugitives VOC HAP H 2 S

natural gas fired engines NO X CO SO 2

truck load out VOC HAP H 2 S

AP

- 42 EMISSION FACTORS

Throughout this Guidance reference is made to AP

- 42 emission factors. The complete AP

- 42 compilation may be downloaded from http://www.epa.gov/ttn/chief/ap42/index.html

STORAGE TANK EMISSIONS

Flashing and Standing/Working/Breathing (S/W/B) losses are the terms for emissions which occur when hydrocarbon liquids are exposed to temperature and pressure changes (i.e., from separator pressure and temperature to storage tank pressure and temperature) causing hydrocarbon vapors to be released from the liquids. The vapors may contain VOCs, HAPs and H 2 S.

Software is available for modeling these emissions. Models accepted by the Air Quality Division are those using Peng

- Robinson or S

- R

- K methods base d on widely accepted principals of behavior for hydrocarbon vapors and liquids. Some common software programs for estimating these emissions are
PROMAX, HYSIM, HYSYS, K

- FLASH, PROSIM and API E&P TANKS v2.0. The models require input detailing chemical pro perties of the fluids handled and physical operating parameters of the system(s) and production equipment

. Output from the models includes volumes, rates and chemical components of the individual process streams from tanks and pressurized vessels.

Emissi ons from storage tanks may also be physically measured. In order to do so all tank valves, hatches, relief devices, leaks, etc. shall be sealed. Tank vapors shall only be allowed to exit the tank through a metered outlet. Usually this requires a meter c apable of measuring low volumes. The measurement period shall last long enough to capture a representative tank vapor volume. An extended hydrocarbon analysis of the vapors shall be obtained along with the vapor volume.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 65 of 76

MEASURED TANK FLASH EMISSIONS

– EXAMPLE CALCULATION

The tons per year of VOC and HAP emissions associated with tank flashing are calculated as follows:

Given: Condensate tank vapors = 1000 scf/day
VOC weight % = 20
HAP weight % = 5

Conde nsate vapor molecular weight = 20 lb/lb

- mol

TPY total flash emissions = 1000 scf/day × (1 lb

- mol/379 scf) × (20 lb/lb

- mol) × (ton/2000 lb) × (365 days/year) = 9.6 TPY

TPY total VOC emissions = 9.6 TPY × (20 weight % VOC / 100) = 1.9 TPY VOC

TPY total HAP emissions = 9.6 TPY × (5 weight % HAP / 100) = 0.5 TPY HAP

S/ W/ B losses Not all software programs include tools for estimating S/ W/ B losses. There is free software available

from the EPA named EPA TANKS. The most recent available version of EPA TANKS is ver. 4.09D. The
software may be downloaded from the EPA website at http://www.epa.gov/ttn/chief/software/tanks/index.html

PRESSURIZED VESSELS

Whenever vapors from a pressurized vessel (separator, treater, FWKO, flash separator, gunbarrel, gas boot, etc) are released to the atmosphere, other than during times of emergency or upset conditions, emissions associated with those vapors shall be accounted for.

The same flash emission models mentioned above, for tank flash emissions, are often used to estimate emissions from pressurized vessels. Again, an extended hydr ocarbon analysis of the liquids involved and actual operational conditions of the production equipment are necessary as input for the models.

Even when vapors from a pressurized vessel are collected for use as process burner fuel or fuel for an IC engine, for example, emissions associated with the total vapors shall be accounted for when considering potential emissions from a facility. If the volume and rate of vented vapors are known and an extended hydrocarbon analysis is available, associated emissions may be calculated in the same manner as described on Page 62 (calculation of flash emissions). If these are not available, the volumes shall be measured and analyzed in order to perform the calculations and determine associated emissions.

DEHYDRATION U NIT EMISSIONS

Air pollutants, mostly VOCs and HAPs, are associated vapors released from reboiler still vents and glycol flash separators. To estimate these emissions the GRI

- GLYCalc v3.0 or higher model or other approved method is used. This relatively inexpensive software was created by the Gas Research Institute (GRI) for determining optimal operating parameters for dehydration units and is available from the Gas Technology Institute (GTI) with a website address of http://www.gastechnology.orgC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 66 of 76

Input for the model includes an extended hydrocarbon analysis of wet gas sampled upstream of the contact tower, actual operating parameters of all associated equipment (i.e., reboiler still vent temp., flash separator temp., dry gas flow rate, glycol recir culation rate, condenser, etc) and physical properties of the dry and wet gas streams. The model provides an estimate of individual emission components and the rates of vapor and liquid streams exiting each process vent of a dehydration unit. When submit ting a

GRI

- GLYCalc model it is only necessary to submit the INPUT SUMMARY, EMISSIONS SUMMARY, CONDENSER VENT OUTPUT (if applicable) and FLASH TANK OUTPUT (if applicable).

NATURAL GAS FIRED HEATERS (external combustion equipment)

NO X , CO and VOC emissio ns from process unit heaters should be calculated using the emission factors (EF) below from EPA AP

- 42, Tables 1.4

- 1, 1.4

- 2 and 1.5

- 1. The following lists these factors:

Emission Factors for Industrial and Commercial Boilers

Pollutant Butane Gas 1 Propane Gas 2 Natural Gas 3 Natural Gas 3

(0.3 to 100 MMBtu/hr heat input) (0.3 to 100 MMBtu/hr heat input) <100 MMBtu/hr heat input

NO X 4 15 lb/1000 gal 13 lb/1000 gal 0.098 lb/MMBtu 100 lb/MMcf

CO 4 8.4 lb/1000 gal 7.5 lb/1000 gal 0.082 lb/MMBtu 84 lb/ MMcf

TOC 4,5 1.1 lb/1000 gal 1.0 lb/1000 gal 0.010 lb/MMBtu 11 lb/MMcf

1 Based on an average heating value of 102 × 10 6 Btu/1000 gallons of Butane.

2 Based on an average heating value of 91.5 × 10 6 Btu/1000 gallons of Propane.

3 Based on an average heating value of 1020 Btu/SCF of natural gas.

4 The emission factors in this table may be converted to other natural gas heating values by multiplying the given emission fac tors

by the ratio of the heating value of the actual gas used to the average heating values l isted Converted EF = (EF from table above × (actual heat value/heat value in table)).

5 VOC emissions may be determined by multiplying the calculated TOC (total organic compounds) emission rate by the weight

percent of VOC compounds in the actual fuel gas stream.

HEATER EMISSIONS

- EXAMPLE CALCULATION

Given: Separator heater rating = 0.5 MMBtu/hr Gas Heating Value = 1300 Btu/scf VOC weight % = 20 Annual operating hours = 8760

NO X EF = 100 lb/MMcf

CO EF = 84 lb/MMcf

TOC EF = 11 lb/MMcf

NO X emissions = (0.5 MMBtu/hr) × (100 lb/MMcf) × (1300 Btu/1020 Btu) x (1 scf/1020 Btu) × (8760 hr/yr) × (ton/2000 lb) = 0.27 TPY NO X

For CO emissions, the same calculation is used except the EF is 84 lb/MMcf.

VOC emissions = 0.5 × 11 x (1300/1020) x 1/1020 × 8760/2000 x (20% VOC/100) = 0.006 VOC TPY VOC ← INSIGNIFICANT at less than

0.1 TPYC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 67 of 76

FLARES

The NO X and CO emissions for flares should be based on 0.14 lb NO X /MMBtu and 0.035 lb

CO/MMBtu 1 and the reported fuel usage based heat input. VOC and HAP emissions from flaring should be based upon the guaranteed destruction efficiency of the flare. Reported flared gases shall include pilot gas with heat content and flared gas with averag e estimated heat content. The rational for using these factors as opposed to AP

- 42 factors for flares is that the flare factors are believed to be only applicable to chemical plant type flares engaged in burning low BTU gases. The gases typically burned in flares in Wyoming contain more than 900 Btu/scf and emissions are expected to be closer to the AP

- 42 factors for

NO X and CO from gas fired heaters and boilers greater than 10 MMBtu/hr.

FLARE EMISSIONS

- EXAMPLE CALCULATIONS

– CONDENSATE TANK FLASH

Giv en: Total waste gas = 125 scf/hr Gas heating value = 1350 Btu/scf

H 2 S weight % = 5.5

H 2 S mole % = 4.4 Tank vapor MW = 28 lb/lbmol

SO 2 MW = 64 lb/lbmol

NO X emissions = (125 scf/hr) × (1350 Btu/scf) × (0.14 lb NO X /MMBtu) × (MMBtu/10 6 Btu) × (8760 hr/yr) × (1 ton/2000 lb) = 0.1 TPY NO X

Unflared H 2 S emissions = (125 scf/hr) × (28 lb/lb

- mol) × (1 lb

- mol/379 scf) × (8760 hr/yr) × (ton/2000 lb) x (5.5/100) = 2. 2 TPY H 2 S

Flared H 2 S emissions = (2.2 TPY) × (100%

- 98%/100)= 0.04 TPY H 2 S ← INSIGNIFICANT at less than 0.1 TPY

SO 2 emissions from flaring sour gas = (125 scf/hr) × (8760 hr/yr) × (1 lb

- mol/379 scf) × (64 lb SO 2 /lb/mol) × (ton/2000 lb) × (4.4/100)

= 4.1 TPY SO 2

FLARE PILOT EMISSIONS

Given: Flare pilot gas = 5 scf/min Gas heating value = 1000 Btu/scf

NO X emissions = (5 scf/min) × (1000 Btu/scf) × (0.14 lb NO X /MMBtu) × (MMBtu/10 6 Btu) × (60 min/hr) × (8760 hr/yr) × (1 ton/2000 lb)

= 0.18 TPY NO X

For CO emissions the same calculations are used except the EF for CO is 0.035 lb/MMBtu.

FLARE EMISSIONS EXAMPLE CALCULATION

– DEHYDRATION UNITS

Given: Glycol flash separator vapors = 25 scf/min Reboiler still vent vapors = 5 scf/min Total waste gas = 30 scf/min (25 scf/min glycol flash vapors + 5 scf/min reboiler still vent vapors) Gas Heating Value = 1050 Btu/scf ( assume at least 1000 BTU/SCF if the heat content is unknown )

NO X emissions = (30 scf/min) × (1050 Btu/scf) × (0.14 lb NO X /MMBtu) × (1 MMBtu/10 6 Btu) × (60 min/hr) × (8760 hr/yr) × (1 ton/2000 lb)

= 1.1 TPY NO X

For CO emissions the same ca lculations are used except the EF for CO is 0.035 lb/MMBtu.

1 Emission factors from Section 4 of EPA Document “Preferred and Alternative Methods for Estimating Air Emissions from Oil and Gas Field Production and Processing Operations”.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 68 of 76

PNEUMATIC PUMP S

If a pneumatic pump uses natural gas as the motive gas, the pump will release VOC and HAP emissions each time it strokes since all motive gas is vented by the pump. To determine emissions from the pump, manufacturer’s information regarding gas usage sh all be known as well as the hydrocarbon composition of the motive gas.

PNEUMATIC PUMP EMISSIONS

- EXAMPLE CALCULATION

A Texsteam Series MX pump is used to circulate hot glycol in heat trace lines. The pump moves 0.15 gallons per 40 strokes and is currently stroking at 20 strokes per minute (spm). The pump requires 24 scf for each gallon of glycol pumped. The pump motive gas weighs 20 lb/lb

- mol and contains 50 wt% VOCs

and 30 wt% HAPs.

Pump usage/vent rate = (20 strokes/min) × (0.15 gallons/40 strokes) × (24 scf/gallon) = 1.8 scf/min

VOC emissions = (1.8 scf/min) × (20 lb/lb

- mol) × (lb

- mol/379 scf) × (ton/2000 lb) × (525600 min/yr) × (50 wt% VOC/100) = 12.5 TPY VO C

TRUCK LOADING

VOC emissions from loading oil or condensate into tank trucks s hould be estimated using the following

formula with data from AP

- 42 tables.

L L - 12.46 × S × P × M/T

Where: L L = loading loss, pound per 1,000 gallons of liquid loaded (lb/1000 gal)

S = a saturation factor (See Table 5.2

- 1 below)

P = true vapor pressure of liquid loaded (psia)

M = molecular weight of tank vapors (lb/lb

- mol)

T = temperature of bulk liquid loaded (oR) (oR = oF + 460)

" S " values are obtained from Table 5.2

- 1.

" M " and " N " values are obtained from Table 7.1

- 2.

T able 5.2

- 1 Saturation (S) Factors for Calculating Petroleum Liquid Loading Losses

Cargo Carrier Mode of Operation " S " Factor

tank trucks and rail tank cars submerged loading of a clean cargo tank 0.50

submerged loading: dedicated normal service 0.60

submerged loading: dedicated vapor balance service 1.00

splash loading of a clean cargo tank 1.45

splash loading: dedicated normal service 1.45

splash loading: dedicated vapor balance service 1.00C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 69 of 76

Table 7.1

- 2 Properties of Selected Petroleum Liquids
Only crude oil properties are supplied here. The full table of values can be found in AP

- 42, Table 7.1

- 2)

petroleum liquid vapor

molecular weight at 60oF (lb/lb

- mol) condensed

vapor density

at 60oF (lb/gal) liquid density at 60oF

(lb/gal) true vapor pressure (psi) at various temperatures in oF

40 50 60 70 80 90 100

" M " " P "

Crude Oil

RVP 5 50 4.5 7.1 1.8 2.3 2.8 3.4 4.0 4.8 5.7

TRUCK LOADOUT

- EXAMPLE CALCULATION

Given: Condensate loaded = 360 bbl crude/month

S = 0.6 P = 2.3 psi

M = 50 lb/lb

- mol

T = 50

L L = (12.46) × (0.60) × (2.3 psi) × (50 lb/lb

- mol) = 1.69 lb/1000 gal (50oF + 460)

Loading losses (TPY) = (1.69 lb/1000 gal) × (annual sales of 360 bbl/mo) × (12 m o/yr) × (42 gal/bbl) × (ton/2000 lb) = 0.15 TPY

FUGITIVE EMISSIONS

The easiest way to calculate total hydrocarbon fugitive emissions is to multiply the number of components at a site by the EPA Average Emissions Factors shown in the tables below. The fi rst table lists the average emission rates of total hydrocarbon (THC) to be assumed for all components in hydrocarbon service installed at a site. The factors are current as of June 15, 1996 and given in pounds

per component

- day (lb/component

- day). The second table lists speciated rates.

The only information needed for this method is a count or estimate of the number of flanges, connectors (other than flanges), open

- ended lines, pumps, valves and "other" components at the site grouped by stream (gas, l ight oil, heavy oil, water/oil). The number of components can be determined by either counting them in the field or by estimating them.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 70 of 76

EPA Average Emission Factors for Total Hydrocarbon (THC) Emissions

From O&G Production Operations

( lb/component

- day)

equipment type equipment service category

gas heavy oil

(< 20oAPI) light oil (> 20oAPI) water/light oil 1

connector .011 .0004 .011 .0058

flange .021 .000021 .0058 .00015

open ended line .11 .0074 .074 .013

other 2 .47 .0017 .4 .74

pump .13 not available .69 .0013

valve .24 .00044 .13 .0052

SOURCE: US EPA Bulletin Board (Leaks_OG.WP5; 8/9/1995)

1 The water/light oil emission factors apply to water streams in light oil service with water content between 50% and 99%. For str eams with water content > 99% the emission rate is considered negligible.

2 The “other” equipment type includes compressor, pr essure relief valves, diaphragms, drains, dump arms, hatches, instruments, meters, polished rods and vents.

NOTE: The emission factors in the table above are not intended to be used to represent emissions from components that are improperly designed (e.g., enardo valves over pressurizing, failure of thief hatches to reseat after over pressurizing) or equipment not m aintained properly (e.g., thief hatch left open). For example, emissions from an enardo valve on a condensate tank vent line, operating in the full or partially open position due to excessive tank vapor pressure that exceeds the pressure setting of the en ardo valve, are not considered to be fugitive emissions.

Speciated hydrocarbon emission rates can be estimated by multiplying the total hydrocarbon emission rates obtained from the table above by actual measured weight fractions or by using the values l isted in

the table below. Speciated Fugitive Emission Factors (Estimated weight fractions of THC emissions in each category)

Methane NMHC VOC C6 + Benzene Toluene Ethyl

Benzene Xylenes

light crude 0.613 0.387 0.292 0.02430 0.00027 0.00075 0.00017 0.00036

heavy crude 0.942 0.058 0.030 0.00752 0.00935 0.00344 0.00051 0.00372

gas production 0.92 0.080 0.035 0.00338 0.00023 0.00039 0.00002 0.00010

NOTES: 1. Emission factor = Speciated Emissions/Total Emissions

2. NMHC = Non

- methane hydrocarbons

3. VOC = Propane and heavier hydrocarbons

FUGITIVE EMISSIONS

- EXAMPLE CALCULATION

Given: 25 valves in light oil service THC emission factor = 0.13 lb/component

- day VOC weight fraction = 0.292 HAP weight fractions = 0.02430 + 0.00027 + 0.00075 + 0.00017 + 0.00036 = 0.0259

VOC emissions = 25 valves × 0.13 lb THC/valves

- day × 1 ton/2000 lb × 365 day/hr × 0.292 = 0.17 TPY VOC

HAP emissions = 25 valves × 0.13 lb THC/valves

- day × 1 ton/2000 lb × 365 day/yr × 0.0259 = 0.015 TPY total HAP sC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 71 of 76

INTERNAL COMBUSTION PUMPING UNIT ENGINE EMISSIONS

The method for calculating engine emissions is to use emission factors provided by the engine manufacturer, the maximum site

- rated horsepower and the annual operating hours.

PUMPING UNIT ENGINE EMISSIONS

- EXAMPLE CALCULATION

Given: Manufacturer’s NO X emission factor = 2 g/hp

- hr

Maximum site

- rated horsepower = 250 hp Annual operating hours = 8760

NO X emissions = (2.0 g/hp

- hr) × (250 hp) × (8760 hr/yr) × (ton/2000 lb) × (1 lb/453.6 g) = 4.8 TPY

For CO and VOC emissions the same calculations are used except the manufacturer’s EF for CO and VOC are used.

CONVERTING MOLE PERCENT TO WEIGHT PERCENT

Many emission estimation and calculation methods require weight percents to be used, rather than mole percents. Most lab analyses list gas constituents in mole percents, however you can request the lab provide both mole and weight percents.

You may download t he Excel spreadsheet to convert mole percent to weight percent, at http://deq.state.wy.us/aqd/miscforms.aspC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 72 of 76



# APPENDIX C

DEFINITIONSC6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 73 of 76

Air Contaminant

- shall mean dust, fumes, mist, smoke, other particulate matter, vapor, gas or any combination of these; but shall not include steam or water vapor.

Air pollutants

- Also known as cri teria pollutants, Air pollutant emissions which have ambient air standards associated with them. Air pollutants include such emissions as volatile organic compounds (VOC), nitrogen oxides (NOx), carbon monoxide (CO), sulfur dioxide (SO 2 ), hazardous air po llutants (HAP) and others.

Average Daily Production

- The qualified maximum total production of domestic crude petroleum and petroleum condensates including natural gas liquids produced from a well during a certain period of time (i.e. 1

- month, 1

- year) di vided by the number of calendar days in the certain period during which the well produced. For example, the average 30

- daily condensate production rate for well ABC is the qualified maximum total condensate production during the 30

- day period x(BBL) ÷ 30( days) = y(BPD). If well ABC only produced 5 days out of the 30

- day period, then the average daily condensate production rate for the well is x(BBL) ÷ 5(days) = y(BPD).

Closed System

– A vessel (treater, separator), pipeline, sales line, gathering line, co llection line, field gas supply or distribution line or any other vessel or line from which no vapors or liquids can exit through open lines, holes, vents or valves unless those lines, holes, vents or valves are connected to another closed

system or to a s ource of continual and complete combustion, unless the vent or valve is a relief device that is designed and intended to open only during emergency situations.

Completion

– An oil well shall be considered completed when the first new oil is produced throu gh wellhead equipment into lease tanks from the producing interval after the production string has been run. A gas well shall be considered completed when the well is capable of producing gas through wellhead equipment from the producing zone after the pr oduction string has been run.

Condensate

- Hydrocarbon liquid separated from natural gas that condenses (becomes liquid) due to changes in temperature, pressure, or both, and remains liquid at standard conditions.

Custody Transfer

- The transfer of produced petroleum and/or condensate, after processing and/or treatment in the producing operations, from storage vessels or automatic transfer facilities to pipelines or any other forms of transportation.

Division

- The Department of Env ironmental Quality, Air Quality Division

First Date of Production

- The date permanent production equipment is in place and product is consistently flowing to sales lines, gathering lines or storage tanks. Production occurring during well completion activities which is routed to temporary production equipment is consid ered to occur prior to the First Date of Production. If extended periods of time pass between zone completions but production from initially completed zones is consistently flowing to permanent production equipment, the First Date

of Production is the dat e when production from the initial zones began consistently flowing to the permanent production equipment, even though more zones will be completed later.

Fugitive Emissions (Fugitives)

- Air emissions which result from gas vapors escaping through and

aro und seals, packing, gaskets, threads, and other such pressure sealing connections.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 74 of 76

Gas

– All natural gases and all hydrocarbons not defined as oil.

Gas Well

– A well, the principal production of which, at the mouth of the well, is gas, as defined by the Wyoming Conservation Law.

Grand fathered

- A facility, installation or site which was built or in service before May 29, 1974 and that has not been physically or operationally changed, causing an increase in any pollutant (to which any state standard appl ies) or causing the emission of a new pollutant. (Modifications which could eliminate grandfather status are increasing production rate by fracturing, acidizing, recompletion of a zone, change in artificial lift methods, bringing new wells into a central battery or a waterflood response. Also such things as installing an engine, increasing horsepower, change in burner ratings. This list is not all inclusive and judgment should be used to determine appropriate status.)

HAP

- Hazardous air pollutant, foun d in Section 112(b) of the Clean Air Act is a list of 188 contaminants with the classification “hazardous air pollutant”. Typical hazardous air pollutants include benzene, toluene, ethyl

- benzene, xylene, n

- hexane, formaldehyde, methanol and others.

Major Emitting Facility

- A facility which either has the potential to emit 250 TPY or more of any one regulated air pollutant or is a named facility and has the potential to emit 100 TPY or more of any one regulated air pollutant.

Major Source

- A source whic h emits either 100 TPY or more of a regulated air pollutant, 10 TPY or more of a hazardous air pollutant, or 25 TPY or more of the total hazardous air pollutants.

Modified Facility

- An existing facility becomes modified once production streams or product ion equipment associated with another well or wells is added to or tied into it. The date modification occurs to an existing facility is the First Date of Production for the added well or the date the production streams

associated with an additional well or wells are tied into equipment at the existing facility.

Examples of modified facilities not involving new wells or added production from other wells are:

An existing well facility is completed in additional production zones resulting in increased produ ction and/or emissions at the facility greater than those previously permitted. Existing production equipment is replaced with larger equipment, resulting in increased potential or actual emissions.

Oil

– Crude petroleum oil and any other hydrocarbons, regardless of gravities, which are produced at the well in liquid form by ordinary production methods, and which are not the result of condensation of gas

before or after it leaves the reservoir.

Oil Well

– A well, the principal production of which, at the mouth of the well, is oil, as defined by the Wyoming Conservation Law.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 75 of 76

PAD

- A PAD facility is a location where more than one well and/or associated production equipment are located, where some or all production equipment is shared by more than one well or where well streams from more than one well are routed through individual production trains located at the same or contiguous and adjacent location. If the production streams or production equipm ent associated with one or more wells is added to an existing single well facility, that location is then considered to be a PAD facility. A single well becomes a multiple well or PAD facility upon the First Date of Production of an

additional well at the location or on the day production streams associated with an additional well or wells from separate locations are routed to the single well facility.

Potential to Emit

- The maximum capacity of a stationary source to emit any air pollutant under its phys ical and operational design. Any physical or operational limitation on the capacity of a source to emit an air pollutant, including air pollution control equipment and restrictions on hours of operation or on the type or amount of material combusted, stor ed or processed, shall be treated as part of its design if the limitation is enforceable by the EPA and the Division.

Recompletion

– Any downhole operation in an existing oil or gas well that is conducted to establish production of oil or gas from any geo logical interval not currently completed or producing in said existing oil or gas well.

Single Well Facility

– A single well facility is one where production equipment is associated with only one well. A single well becomes a multiple well or PAD facilit y upon the First Date of Production of an additional well at the location or on the day production streams associated with an additional well or wells from separate locations are routed to the single well facility.

Spud

– The commencement of operations f or the first boring of a hole for the drilling of an oil, gas or injection well. This includes setting conductor casing.

Synthetic Minor

- “Synthetic Minor” sources are sources that do the following types of things to limit

emission rates below 100 TPY : 1) limit operating hours of a source or 2) limit production rates such that

source emissions are less than 100 TPY.

VOC

- Volatile organic compound means any organic compound which participates in atmospheric photochemical reactions; typically conside red C 3 + or Non

- methane/ethane hydrocarbon vapors.

VOC Weight Percent

- This is the weight of the volatile organic compounds, expressed as a percent, as compared to the total weight of the compounds in a gas stream. (This should not be confused with the volume or mole percent of a gas stream, which is usually how it is expressed in a lab analysis of a gas.)

Wildcat Well

– Any oil or gas well designated as a wildcat well by the Wyoming Oil and Gas

Conservation Commission. Wildcat wells are wells outside known fields or new wells which are determined by the Commission to have discovered oil or gas in a pool not previously proven productive.C6 S2 O&G Production Facilities Permitting Guidance September 2013 Page 76 of 76

Workover

– Any downhole operation in an existing oil or gas well that is designed to sustain, restore or increase the production rate or ultimate recovery in a geologic interval currently completed or producing in said existing oil or gas well. Workover includes but is not limited to: acidizing, reperforating, fracture treating, sand/paraffin removal, casing repair, squeeze cementing or setting bridge plugs to isolate water productive zones from oil or gas productive zones or any combination thereof. Workover doe s not mean the routine maintenance, repair or replacement of downhole equipment such as rods, pumps, tubing, packers or other mechanical devices.

Worst case

- A situation allowed in air permitting in the State of Wyoming where a facility, site or

sourc e (which is representative of all the facilities, sites or sources within a designated field area) may be used to represent the worst air emissions for the field area sources.

Wyoming Environmental Quality Act

- Wyoming Statute, Title 35 “Public Health an d Safety”, Chapter 11 “Environmental Quality” which provides the authority for the rules and regulations of the Air Quality

Division.