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Home My WebLink About20152852.tiff A COPHQB COLORADO Co Department of Public " Health Et Environment Dedicated to protecting and improving the health and environment of the people of Colorado Weld County - Clerk to the Board RECEIVED 11500 St V PO Box 758 Greeley, CO 80632 AUG 2 7 2015 August 20, 2015 TY COMMISSIONERS Dear Sir or Madam: On August 26, 2015, the Air Pollution Control Division will begin a 30-day public notice period for Whiting Oil and Gas Corporation - Twomile 15-1033H. A copy of this public notice and the public comment packet are enclosed. Thank you for assisting the Division by posting a copy of this public comment packet in your office. Public copies of these documents are required by Colorado Air Quality Control Commission regulations. The packet must be available for public inspection for a period of thirty (30) days from the beginning of the public notice period. Please send any comment regarding this public notice to the address below. Colorado Dept. of Public Health Et Environment APCD-SS-B1 4300 Cherry Creek Drive South Denver, Colorado 80246-1530 Attention: Clara Gonzales Regards, � - Ca) Clara Gonzales Public Notice Coordinator Stationary Sources Program Air Pollution Control Division Enclosure 2015-2852 p Pula( eu1Q1• Cr✓-Rj�W� '1a'7 c €nt $-02[,-/S 4300 Cherry Creek Drive S., Denver, CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe 6; John W. Hickenlooper, Governor I Larry Wotk,MD,MSPH, Executive Director and Chief Medical Officer A CDPHE Air Pollution Control Division CO Notice of a Proposed Project or Activity Warranting Public Comment Website Title: Whiting Oil and Gas Corporation - Twomile 15-1033H - Weld County Notice Period Begins: August 26, 2015 Notice is hereby given that an application for a proposed project or activity has been submitted to the Colorado Air Pollution Control Division for the following source of air pollution: Applicant: Whiting Oil and Gas Corporation Facility: Twomile 15-1033H Oil and Gas Production Facility SESW Section 15, T11 N, R57W Weld County The proposed project or activity is as follows: Applicant proposes to increase process and emission limits in an existing permit to allow for up to 20% control device downtime. With emission increase, facility becomes synthetic minor for VOC. The Division has determined that this permitting action is subject to public comment per Colorado Regulation No. 3, Part B, Section III.C due to the following reason(s): • the source is requesting a federally enforceable limit on the potential to emit in order to avoid other requirements The Division has made a preliminary determination of approval of the application. A copy of the application, the Division's analysis, and a draft of Construction Permit 13WE1361 have been filed with the Weld County Clerk's office. A copy of the draft permit and the Division's analysis are available on the Division's website at https://www.colorado.gov/pacific/cdphe/air-permit-public-notices The Division hereby solicits submission of public comment from any interested person concerning the ability of the proposed project or activity to comply with the applicable standards and regulations of the Commission. The Division will receive and consider written public comments for thirty calendar days after the date of this Notice. Any such comment must be submitted in writing to the following addressee: Bradley Eades Colorado Department of Public Health and Environment 4300 Cherry Creek Drive South, APCD-SS-B1 Denver, Colorado 80246-1530 cdphe.commentsapcd@state.co.us 1 ,7 STATE OF COLORADO co •LORAD D PA TM T •F P LIC HEALTH AND ENVIRONMENT a�Q c AIR POLLUTION CONTROL DIVISION y TELEPHONE: (303) 692-3150 *t * 1876* CONSTRUCTION PERMIT PERMIT NO: 13WE1361 Issuance 2 DATE ISSUED: ISSUED TO: Whiting Oil and Gas Corporation THE SOURCE TO WHICH THIS PERMIT APPLIES IS DESCRIBED AND LOCATED AS FOLLOWS: Oil and gas exploration and production facility known as the Twomile 15-1033H, located in the SWSE Section 15, T11 N, R57W, Weld County, Colorado. THE SPECIFIC EQUIPMENT OR ACTIVITY SUBJECT TO THIS PERMIT INCLUDES THE FOLLOWING: Facility AIRS Equipment Point Description ID SEP 01, One (1) two-phase separator with emissions routed to an open FLR-01 004 flare. Open flare has a minimum control efficiency of 95%. Flare pilot has a maximum assumed downtime of 20%. THIS PERMIT IS GRANTED SUBJECT TO ALL RULES AND REGULATIONS OF THE COLORADO AIR QUALITY CONTROL COMMISSION AND THE COLORADO AIR POLLUTION PREVENTION AND CONTROL ACT C.R.S. (25-7-101 et seq), TO THOSE GENERAL TERMS AND CONDITIONS INCLUDED IN THIS DOCUMENT AND THE FOLLOWING SPECIFIC TERMS AND CONDITIONS: REQUIREMENTS TO SELF-CERTIFY FOR FINAL AUTHORIZATION 1. Within one hundred and eighty days (180) after commencement of operation or issuance of this permit, whichever comes later, compliance with the conditions contained in this permit shall be demonstrated to the Division. It is the owner or operator's responsibility to self-certify compliance with the conditions. Failure to demonstrate compliance within 180 days may result in revocation of the permit. (Reference: Regulation No. 3, Part B, III.G.2). 2. This permit shall expire if the owner or operator of the source for which this permit was issued: (i) does not commence construction/modification or operation of this source within 18 months after either, the date of issuance of this construction permit or the date on which such construction or activity was scheduled to commence as set forth in the permit application associated with this permit; (ii) discontinues construction for a period of eighteen months or more; (iii) does not complete construction within a reasonable time of the estimated completion date. The Division may grant extensions of the deadline per Regulation No. 3, Part B, III.F.4.b. (Reference: Regulation No. 3, Part B, III.F.4.) AIRS ID: 123/9AF2 Page 1 of 8 olor. Depa en . • .li Health and Environment •it Pollution Control Division 3. The operator - =in - -e -I . '•n le - -.Lied by the Division, after completion of self-certification, with the most current construction permit. This construction permit alone does not provide final authority for the operation of this source. EMISSION LIMITATIONS AND RECORDS 4. Emissions of air pollutants shall not exceed the following limitations (as calculated in the Division's preliminary analysis). (Reference: Regulation No. 3, Part B, Section II.A.4) Annual Limits: Facility AIRS Tons per Year Equipment ID Point NO VOC CO Emission Type x SEP-01, FLR- 004 1.1 21.7 5.6 Point 01 See "Notes to Permit Holder"for information on emission factors and methods used to calculate limits. Compliance with the annual limits shall be determined by recording the facility's annual criteria pollutant emissions, (including all HAPs above the de-minimis reporting level) from each emission unit, on a rolling twelve (12) month total. By the end of each month a new twelve-month total shall be calculated based on the previous twelve months' data. The permit holder shall calculate emissions each month and keep a compliance record on site or at a local field office with site responsibility, for Division review. This rolling twelve-month total shall apply to all permitted emission units, requiring an APEN, at this facility. 5. The emission points in the table below shall be operated and maintained with the control equipment as listed in order to reduce emissions to less than or equal to the limits established in this permit (Reference: Regulation No.3, Part B, Section III.E.) Facility AIRS Pollutants Equipment Point Control Device Controlled ID SEP-01, 004 Open Flare VOC, HAPs FLR-01 PROCESS LIMITATIONS AND RECORDS 6. This source shall be limited to the following maximum processing rates as listed below. Monthly records of the actual processing rates shall be maintained by the owner or operator and made available to the Division for inspection upon request. (Reference: Regulation 3, Part B, II.A.4) Process/Consumption Limits Facility AIRS Equipment Point Process Parameter Annual Limit ID Natural gas routed to open flare from two- 6.57 MMSCF/yr SEP-01, phase separator FLR-01 004 Natural gas routed to open flare from two- phase separator during control device 1.32 MMSCF/yr downtime AIRS ID: 123/9AF2 Page 2 of 8 olor Depa en f P li Health and Environment it Pollution Control Division Compliance n ro li e det ed on a rolling twelve (12) month total. By the end of each month a new twelve-month total is calculated based on the previous twelve months' data. The permit holder shall calculate throughput each month and keep a compliance record on site or at a local field office with site responsibility, for Division review. 7. The owner or operator shall continuously monitor and record the volumetric flow rate of natural gas routed to the flare using a flow meter. The flow meter shall continuously measure flow rate and record total volumetric flow of gas routed to the flare from the separators. 8. The owner or operator shall monitor and record control device downtime. The owner or operator shall monitor and record control device downtime manually through site-visits a minimum of once per week. If the control device is observed to not be operating during a site visit, the operator must record downtime as the time elapsed since the last time the control device was observed to be operational. The owner or operator shall use monthly control device downtime records, monthly throughput records and calculation methods detailed in the O&M Plan to demonstrate compliance with the limits specified in this permit. STATE AND FEDERAL REGULATORY REQUIREMENTS 9. The permit number and AIRS ID point number (e.g. 123/4567/890) shall be marked on the subject equipment for ease of identification. (Reference: Regulation Number 3, Part B, III.E.) (State only enforceable) 10. No owner or operator of a smokeless flare or other flare for the combustion of waste gases shall allow or cause emissions into the atmosphere of any air pollutant which is in excess of 30% opacity for a period or periods aggregating more than six minutes in any sixty consecutive minutes. (Reference: Regulation No. 1, Section II.A.5.) 11. This source is subject to the odor requirements of Regulation No. 2. (State only enforceable) OPERATING & MAINTENANCE REQUIREMENTS 12. Upon startup of these points, the owner or operator shall follow the most recent operating and maintenance (O&M) plan and record keeping format approved by the Division, in order to demonstrate compliance on an ongoing basis with the requirements of this permit. Revisions to your O&M plan are subject to Division approval prior to implementation. (Reference: Regulation No. 3, Part B, Section III.G.7.) COMPLIANCE TESTING AND SAMPLING 13. This source is not required to comply with any testing and sampling requirements. ADDITIONAL REQUIREMENTS 14. All previous versions of this permit are cancelled upon issuance of this permit. 15. A revised Air Pollutant Emission Notice (APEN) shall be filed: (Reference: Regulation No. 3, Part A, II.C) a. Annually by April 30th whenever a significant increase in emissions occurs as follows: e3of8 Pa AIRS ID: 123/9AF2 g I III olor- A Depa en ' .li Health and Environment it Pollution Control Division Fora a • - a For sources emitting less than 100 tons per year, a change in actual emissions of five (5) tons per year or more, above the level reported on the last APEN; or For sources emitting 100 tons per year or more, a change in actual emissions of five percent or 50 tons per year or more, whichever is less, above the level reported on the last APEN submitted; or For any non-criteria reportable pollutant: If the emissions increase by 50% or five (5) tons per year, whichever is less, above the level reported on the last APEN submitted to the Division. b. Whenever there is a change in the owner or operator of any facility, process, or activity; or c. Whenever new control equipment is installed, or whenever a different type of control equipment replaces an existing type of control equipment; or d. Whenever a permit limitation must be modified; or e. No later than 30 days before the existing APEN expires. 16. Federal regulatory program requirements (i.e. PSD, NANSR or Title V Operating Permit) shall apply to this source at any such time that this source becomes major solely by virtue of a relaxation in any permit condition. Any relaxation that increases the potential to emit above the applicable Federal program threshold will require a full review of the source as though construction had not yet commenced on the source. The source shall not exceed the Federal program threshold until a permit is granted. (Regulation No. 3 Part D). GENERAL TERMS AND CONDITIONS 17. This permit and any attachments must be retained and made available for inspection upon request. The permit may be reissued to a new owner by the APCD as provided in AQCC Regulation No. 3, Part B, Section II.B upon a request for transfer of ownership and the submittal of a revised APEN and the required fee. 18. If this permit specifically states that final authorization has been granted, then the remainder of this condition is not applicable. Otherwise, the issuance of this construction permit does not provide "final" authority for this activity or operation of this source. Final authorization of the permit must be secured from the APCD in writing in accordance with the provisions of 25-7-114.5(12)(a) C.R.S. and AQCC Regulation No. 3, Part B, Section III.G. Final authorization cannot be granted until the operation or activity commences and has been verified by the APCD as conforming in all respects with the conditions of the permit. Once self-certification of all points has been reviewed and approved by the Division, it will provide written documentation of such final authorization. Details for obtaining final authorization to operate are located in the Requirements to Self- Certify for Final Authorization section of this permit. 19. This permit is issued in reliance upon the accuracy and completeness of information supplied by the owner or operator and is conditioned upon conduct of the activity, or construction, installation and operation of the source, in accordance with this information and with representations made by the owner or operator or owner or operator's agents. It is valid only for the equipment and operations or activity specifically identified on the permit. AIRS ID: 123/9AF2 Page 4 of 8 .. olor-A Depa en P .li 'Health and Environment it Pollution Control Division 20. Unless specifi - ed sz _- t - g - o g_-• spec:.. onditions contained in this permit have been determined by the APCD to be necessary to assure compliance with the provisions of Section 25-7-114.5(7)(a), C.R.S. 21. Each and every condition of this permit is a material part hereof and is not severable. Any challenge to or appeal of a condition hereof shall constitute a rejection of the entire permit and upon such occurrence, this permit shall be deemed denied ab initio. This permit may be revoked at any time prior to self-certification and final authorization by the Air Pollution Control Division (APCD) on grounds set forth in the Colorado Air Quality Control Act and regulations of the Air Quality Control Commission (AQCC), including failure to meet any express term or condition of the permit. If the Division denies a permit, conditions imposed upon a permit are contested by the owner or operator, or the Division revokes a permit, the owner or operator of a source may request a hearing before the AQCC for review of the Division's action. 22. Section 25-7-114.7(2)(a), C.R.S. requires that all sources required to file an Air Pollution Emission Notice (APEN) must pay an annual fee to cover the costs of inspections and administration. If a source or activity is to be discontinued, the owner must notify the Division in writing requesting a cancellation of the permit. Upon notification, annual fee billing will terminate. 23. Violation of the terms of a permit or of the provisions of the Colorado Air Pollution Prevention and Control Act or the regulations of the AQCC may result in administrative, civil or criminal enforcement actions under Sections 25-7-115 (enforcement), -121 (injunctions), -122 (civil penalties), -122.1 (criminal penalties), C.R.S. By: Bradley Eades Permit Engineer Permit History Issuance Date Description Issuance 2 This Issuance Issued to Whiting Oil and Gas Corporation. Increase annual process/consumption limits and permitted emissions. Process limit for throughput during control device downtime was added. Issuance 1 July 29, 2013 Newly permitted flare stack at true minor facility AIRS ID: 123/9AF2 Page 5 of 8 olor. Depa en . • •li 'Health and Environment •it Pollution Control Division Notes to Permit Holder me o •e ' a -. 1) The permit holder is required to pay fees for the processing time for this permit. An invoice for these fees will be issued after the permit is issued. The permit holder shall pay the invoice within 30 days of receipt of the invoice. Failure to pay the invoice will result in revocation of this permit (Reference: Regulation No. 3, Part A, Section VI.B.) 2) The production or raw material processing limits and emission limits contained in this permit are based on the consumption rates requested in the permit application. These limits may be revised upon request of the owner or operator providing there is no exceedance of any specific emission control regulation or any ambient air quality standard. A revised air pollution emission notice (APEN) and complete application form must be submitted with a request for a permit revision. 3) This source is subject to the Common Provisions Regulation Part II, Subpart E, Affirmative Defense Provision for Excess Emissions During Malfunctions. The owner or operator shall notify the Division of any malfunction condition which causes a violation of any emission limit or limits stated in this permit as soon as possible, but no later than noon of the next working day, followed by written notice to the Division addressing all of the criteria set forth in Part II.E.1 of the Common Provisions Regulation. See: http://www.colorado.aov/cs/Satellite?c=Document C&childpaqename=CDPHE- Main%2FDocument C%2FCBONAddLinkView&cid=1251599389641&paaename=CBONWrapper 4) The following emissions of non-criteria reportable air pollutants are estimated based upon the process limits as indicated in this permit. This information is listed to inform the operator of the Division's analysis of the specific compounds emitted if the source(s)operate at the permitted limitations. Uncontrolled Emission Are the Controlled AIRS Rate emissions Emission Rate Point Pollutant CAS# (lb/yr) reportable? (lb/yr) Benzene 71432 484 Yes 116 n-Hexane 110543 5138 Yes 1233 004 Toluene 108883 477 Yes 114 Ethylbenzene 100414 81 Yes 19 Xylenes 1330207 154 Yes 37 Note: Controlled emissions are based on a maximum assumed downtime of 1752 hr/yr(20%). Controlled emissions are based on VOC and HAP control efficiency of 95%when control device is operational as described in the process table below. AIRS % Pollutants Point Process Process Description Reduction Controlled 01 Venting while controls operational 95% VOC, HAPs 004 5.26 MMSCF/yr 02 Venting during flare downtime 0% NA 1.32 MMSCF/yr AIRS ID: 123/9AF2 Page 6 of 8 olor Depa en f P li `Health and Environment it Pollution Control Division 5) The emission level ,,; -d i p b follov „` ission factors: Point 004: Mole Emission Pollutant Fraction of Factors Source Gas (%) Uncontrolled lb/MMscf NOx* 86.1 AP-42 (controlled) CO * 392.5 AP-42 (controlled) VOC 18.40 27493.0 Gas Analysis Benzene 0.04 73.7 Gas Analysis Toluene 0.03 72.6 Gas Analysis n-hexane 0.34 782.1 Gas Analysis *NOx and CO emission factors were calculated based on vented gas heat content 1,266 Btu/scf and AP-42 emission factors in Chapter 13 Table 13.5-1 (NOx:0.068 lb/MMbtu; CO: 0.37 lb/MMbtu) 6) In accordance with C.R.S. 25-7-114.1, each Air Pollutant Emission Notice (APEN) associated with this permit is valid for a term of five years from the date it was received by the Division. A revised APEN shall be submitted no later than 30 days before the five-year term expires. Please refer to the most recent annual fee invoice to determine the APEN expiration date for each emissions point associated with this permit. For any questions regarding a specific expiration date call the Division at (303)-692-3150. 7) This facility is classified as follows: Applicable Status Requirement Operating Permit Synthetic Minor Source of: VOC PSD Minor Source 8) Full text of the Title 40, Protection of Environment Electronic Code of Federal Regulations can be found at the website listed below: http://ecfr.gpoaccess.gov/ Part 60: Standards of Performance for New Stationary Sources NSPS 60.1-End Subpart A—Subpart KKKK NSPS Part 60, Appendixes Appendix A—Appendix I Part 63: National Emission Standards for Hazardous Air Pollutants for Source Categories MACT 63.1-63.599 Subpart A—Subpart Z MACT 63.600-63.1199 Subpart AA—Subpart DDD MACT 63.1200-63.1439 Subpart EEE—Subpart PPP MACT 63.1440-63.6175 Subpart QQQ—Subpart YYYY MACT 63.6580-63.8830 Subpart ZZZZ—Subpart MMMMM MACT 63.8980-End Subpart NNNNN—Subpart XXXXXX AIRS ID: 123/9AF2 Page 7 of 8 olor. Depa en . li Health' and Environment it Pollution Control Division 9) A self certification form and guidance on how to self-certify compliance as required by this permit may be obtained online at: http://www.colorado.gov/pacific/cdphe/air-permit-self-certification AIRS ID: 123/9AF2 Page 8 of 8 Division Information Engineer: Bradley Eades Control Engineer: Christopher Laplante Review Date: 05/29/2015 Application Date: 02/24/2015 Facility Identifiers Permit No. 13WE1361 AIRs County# 123 Weld Facility# 9AF2 Facility Type: exploration and production facility ❑Located in the 8-hour non-attainment area? O True Minor ® Synthetic Minor for: f' VOC NOx r CO Administrative Information Company Name: Whiting Oil and Gas Corporation Source Name: Twomile 15-1033H Source Location: SWSE Section 15, T11 N, R57W SIC: 1311 Address 1: Whiting Oil and Gas Corporation Mailing Address Address 2: 1700 Broadway,Suite 2300 ty,State Zip: Denver, CO 80290 Name: Chenine Wozniak Person To Phone: 303-802-8369 Contact Fax: 303-861-4023 Email: chenine.wozniak@whiting.com Requested Action Self Certification Required? Yes Issuance Number: 2 Source Description: Oil and gas exploration and production facility known as the Twomile 15-1033H, located in the SWSE Section 15, T11 N, R57W,Weld County, Colorado. Point Name Type Control Action Modification to increase Sep-01, FLR. 004 01 Separator Venting Flare permit limits due to exceedances 004 Two-phase separator controlled by an open flare.Flare has a minimum control efficiency of 95%. 'Flare is assumed to have have 20%downtime Equipment Description This source vents natural gas from: a well head separator Emissions from this source are: routed to a flare Natural gas venting from a well head separator.Emissions from this source are routed to a flare. Total Requested Volume: 6.57 MMscf/yr Requested throughput while controls are operational: 5.256 MMscf/yr Requested throughput during control device downtime: 1.314 MMscf/yr Calculations Emission Calculation Method EPA Emission Inventory Improvement Program Publication:Volume II,Chapter 10-Displacement Equation(10.4-3) Ex=Q'MW*Xx/C Ex=emissions of pollutant x Q=Volumetric flow rate/volume of gas processed MW=Molecular weight of gas=SG of gas'MW of air Xx=mass fraction of x in gas C=molar volume of ideal gas(379 scf/lb-mol)at 60F and 1 atm Throughput(0) 6.570 MMscf/yr 750 scf/hr MW 26.71 Ib/Ib-mol 0.0180 MMscf/d mole% MW Ibx/Ibmol mass fraction lb/hr lb/yr tray Helium 0.0300 4.003 0.001 0.0000 0.00 20.82 0.01 CO2 3.3900 45.383 1.538 0.0576 3.04 26669.97 13.33 N2 2.9900 28.013 0.838 0.0314 1.66 14519.68 7.26 methane 67.1642 16.536 11.106 0.4158 21.98 192523.85 96.26 ethane 7.6891 30.994 2.383 0.0892 4.72 41312.06 20.66 propane 9.1749 44.092 4.045 0.1515 801 70127.33 35.06 isobutane 10918 58.118 0.635 0.0238 1.26 10999.68 5.50 n-butane 4.0995 58.118 2.383 0.0892 4.71 41301.68 20.65 isopentane 0.9640 72.114 0.695 0.0260 1.38 12050.99 6.03 n-pentane 1.2883 72.114 0.929 0.0348 1.84 16105.08 8.05 cyclopentane 0.1070 70.13 0.075 0.0028 0.15 1300.81 0.65 n-Hexane 0.3443 86.18 0.297 0.0111 0.59 5143.63 2.57 cyclohexane 0.0799 84.16 0.067 0.0025 0.13 1165.68 0.58 Other hexanes 0.6134 86.18 0.529 0.0198 1.05 9163.82 4.58 heptanes 0.3606 100.21 0.361 0.0135 0.72 6264.16 3.13 methylcyclohexane 0.0810 98.19 0.080 0.0030 0.16 1378.73 0.69 224-TMP 0.0004 114.23 0.000 0.0000 0.00 7.92 0.00 Benzene 0.0358 78.12 0.028 0.0010 0.06 484.81 0.24 Toluene 0.0299 92.15 0.028 0.0010 0.05 477.63 0.24 Ethylbenzene 0.0044 106.17 0.005 0.0002 0.01 80.98 0.04 Xylenes 0.0084 106.17 0.009 0.0003 0.02 154.60 0.08 C8+Heavies 0.2346 289.287 0.679 0.0254 1.34 11766.43 5.88 VOC mass fraction: 0.406 Total VOC(Uncontrolled) 93.99 Notes Mole%and mass fractions from Two Mile 15-1033AH gas analysis collected 07/24/14. Emissions are based on 8760 hours of operation per year. I calculated the average MW of C8+based the avg MW of gas provided by Whiting • 13WE1361.CP2.xlsm 004 Two-phase separator controlled by an open flare.Flare has a minimum control efficiency of 95%. Flaring Information Equipment Description Flare to combust low-pressure separator gas during VRU downtime. Manufacturer TBD Model TBD Serial Number Gas Heating Value 1266 Btu/scf Throughput 8317.62 MMBtu/yr Note:Per application and NOS submitted 02/06/2014,Flare is shop built 'Overall Control I 95.00% Pollutants AIRS Point Process Process Description %Reduction Controlled 01 Venting while controls operational 95% VOC,HAPs 004 5.26 MMSCF/yr 02 Venting during control device downtime 0% NA 1.32 MMSCF/yr Total Requested Volume: 6.57 MMscf/yr Venting while controls are operational: 5.256 MMscf/yr Venting during control device downtime: 1.314 MMscf/yr Controlled Emissions=[(Td)x EF]+[(T-Td)x EF x(1-C)] • Td=Portion of gas throughput during control downtime EF=Calculated uncontrolled emission factor T=Throughput while controls operational C=VOC/HAP control efficiency while controls are operational Combustion emission factor source: AP-42:Chapter 13.5 0.07 IlbNOX/MMBtu 0.31 IlbCO/MMBtu Emissions Summary Table Pollutant Uncontrolled Emission Factor Uncontrolled Emissions Controlled Emissions Source 1 VOC 28611 Ib/MMscf 94.0 tpy 22.6 tpy Gas Analysis/Eng.Ca lc. Nox 0.07 Ib/MMBTU 0.3 tpy 0.1 tpy AP-42 CO 0.31 Ib/MMBTU 1.3 tpy 0.5 tpy AP-42 Benzene 73.79 Ib/MMscf 485 lb/yr 116.4 lb/yr Gas Analysis/Eng.Ca lc. n-Hexane 782.90 Ib/MMscf 5144 lb/yr 1234.5 lb/yr Gas Analysis/Eng.Ca lc. Toluene 72.699 Ib/MMscf 478 lb/yr 114.6 lb/yr Gas Analysis/Eng.Ca lc. Xylenes 23.531 Ib/MMscf 155 lb/yr 37.1 lb/yr Gas Analysis/Eng.Ca lc. Ethyl benzene 12.326 lb/MMscf 81 lb/yr 19.4 lb/yr Gas Analysis/Eng.Ca lc. Note:Values used in permit are reflected below.Differences due to rounding. Regulatory Applicability AQCC Regulation 1 This source is subject to the opacity requirements for flares in Section II.A.5:'No owner or operator of a smokeless flare or other flare for the combustion of waste gases shall allow or cause emissions into the atmosphere of any air pollutant which is in excess of 30%opacity.' AQCC Regulation 2 Section I.A applies to all emission sources."No person,wherever located,shall cause or allow the emission of odorous air contaminants from any single source such as to result in detectable odors which are measured in excess of the following limits: For areas used predominantly for residential or commercial purposes it is a violation if odors are detected after the odorous air has been diluted with seven (7)or more volumes of odor free air." AQCC Regulation 7 Was the well newly constructed,hydraulically fractured,or recompleted on or after August 1,2014? No This separator is not subject to Reg 7 Section XVII.G Per email correspondence from Whiting on 06/05/2015,the most recently completed well at this facility is Twomile 15-1033AH.Date of first production for this well is 10/29/2012 Miscellaneous Notes Whiting submitted this update/mod as a result of the facility experiencing periods of larger than expected monthly natural gas production in addition to unforeseen flare downtime.The potential compliance issue was self-disclosed under separate cover on February 17,2015. Modification makes facility synthetic minor source of VOCs.An O&M plan was submitted with application. 13WE1361.CP2.xlsm 004 Two-phase separator controlled by an open flare.Flare has a minimum control efficiency of 95%. The orignial application submitted requested a process volume of 23.73 MMscf/yr with actual volume of 3.9 MMscf/yr.It was communicated to Whiting that requested volume appears innappropriate for the actual expected throughputs.A meeting took place with Chenine Wozniak and Andrea Huggins on 07/06/2015 at CDPHE where flare downtime and development of requested permit values were discussed.It was determined that Whiting would request a significantly lower volume,with 20%anticipated flare downtime. Emailed operator to request O&M plan include calculation methods for process limits.A revised O&M Plan was received 07/14/2015. Sent draft permit to operator on July 10,2015 and received comments July 14th.Comments are responses are summarized below: -Source requested a revised process description to include the assumed control device downtime of 20%.Description was revised to reflect"maximum assumed control device downtime is 20%". -Source requested consistency in referring to gas coming off the separator as"gas routed to open flare"rather than"gas venting from separator".I updated the corresponding permit language accordingly. Operator calculated total weight of gas and VOC emissions based on an estimated MW of Hexane+(93.6974 lb/lb-mol).Emissions calculated in PA were slgihtly different than those calculated by Whiting.Difference is insignificant and may be attributed to rounding,so I will use what was provided by Whiting.Values are as in table below Emission Factors for Permit Uncontrolled Uncontrolled Emissions NOX 86.09 Ib/MMscf natural gas vented 0.28 tpy CO 392.46 Ib/MMscf natural gas vented 1.29 tpy VOC 27493.0 Ib/MMsd natural gas vented 90.3 tpy Benzene 73.7 Ib/MMsd natural gas vented 484 lb/yr Toluene 72.6 Ib/MMscf natural gas vented 477 lb/yr Ethylbenzene 12.3 lb/MMscf natural gas vented 81 lb/yr Xylenes 23.5 Ib/MMscf natural gas vented 154 lb/yr n-Hexane 782.1 Ib/MMscf natural gas vented 5138 lb/yr Controlled Controlled Emissions NOX 86.1 lb/MMscf natural gas vented 0.28 tpy CO 392.5 lb/MMscf natural gas vented 1.29 tpy VOC 6598.3 lb/MMscf natural gas vented 21.68 tpy Benzene 3.7 lb/MMscf natural gas vented 116.21 lb/yr Toluene 3.6 lb/MMscf natural gas vented 114.48 lb/yr Ethylbenzene 0.6 lb/MMscf natural gas vented 19.39 lb/yr Xylenes 1.2 Ib/MMscf natural gas vented 37.05 lb/yr n-Hexane 39.1 lb/MMscf natural gas vented 1233.22 lb/yr 13WE1361.CP2.xlsm AIRS(County/Plant) 123/9AF2 Permit No. 13WE1361 Date 5/29/2015 Controlled Controlled Actual Requested NCRP= Uncontrolled Emission Emissions Emissions PTE Ctrl. reportable Point# SCC Pollutant or CAS Factor Emisison Factor Source (tpy)* (tpy)* (tpy)* Eff/0 ? 004 31000205 VOC 27493 lb/MMscf Gas Analysis/Eng.Calc. 8.4 21.7 90.3 95% Yes 004 31000205 Benzene 73.7 lb/MMscf Gas Analysis/Eng.Calc. de minimus 116 484 95% Yes 004 31000205 n-Hexane 782.1 lb/MMscf Gas Analysis/Eng.Calc. de minimus 5138 1233 95% Yes 004 31000205 Toluene 72.6 lb/MMscf Gas Analysis/Eng.Calc. de minimus 114 477 95% Yes 004 31000205 Ethylbenzene 12.3 Ib/MMscf Gas Analysis/Eng.Calc. de minimus 19 81 95% No 004 31000205 Xylenes 23.5 lb/MMscf Gas Analysis/Eng.Calc. de minimus 154 37 95% No • y N O 8) y 9 `7 `n ; N O LC C C" 0 p, e c a i C x v; V0 C CCS T v v -- as G cn — 7 [� 7 C C.• C' E E Z y -- M M M •..� _ Cy ❑ - C _� �0 J N N N -n :n _ = T ,„0> N L < L c'- ace 0 'S. }., _ C v {y O a G v - C G U E m ,-- y y c _ > E G y O a 'L7 'S. > cq y p L .M... cc• G O - Q cm ,• c :-.• E'm y 4.1 a J U 4 a G it .. > 1.a G _ p s _ .J C D -6.. 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