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Home My WebLink AboutDAQ-2024-0112021 DAQC-CI141910001-24 Site ID 14191 (B1) MEMORANDUM TO: FILE – MOUNTAIN WEST PIPELINE, LLC THROUGH: Rik Ombach, Minor Source Compliance Oil and Gas Section Manager FROM: Stephen Foulger, Environmental Scientist DATE: October 9, 2024 SUBJECT: FULL COMPLIANCE EVALUATION, Minor, Daggett County INSPECTION DATE: September 18, 2024 SOURCE LOCATION: Clay Basin Gas Wells #2 Sections 16, 20, 21, 22, 23, 26, and 27 T3N, R24B well field remote locations Clay Basin, UT DIRECTIONS: 40.90698951, -109.1952386 SOURCE CONTACTS: Dani Baldwin, Environmental Specialist Phone: (801) 201-0595, Email: dani.baldwin@williams.com OPERATING STATUS: Operating. PROCESS DESCRIPTION: In the Clay Basin field, natural gas is dried by dehydration units which are located at separate injection/withdrawal wells. The dehydration units were installed during the original construction of the Kastler Compressor Station located in Daggett County. The dry natural gas is stored underground and then recovered for distribution and sale. The dehydration units are located at individual well sites. APPLICABLE REGULATIONS: Approval Order (AO) DAQE-ANSR0141910002-10, dated July 8, 2010 SOURCE EVALUATION: Name of Permittee: Permitted Location: Mountain West Pipeline, LLC P.O. Box 45922 40.90698951 -109.1952386 Salt Lake City, UT 84145 Clay Basin, UT SIC Code: 4922: (Natural Gas Transmission) 2 Section I: GENERAL PROVISIONS I.1 All definitions, terms, abbreviations, and references used in this AO conform to those used in the UAC R307 and 40 CFR. Unless noted otherwise, references cited in these AO conditions refer to those rules. [R307-101] Status: In Compliance. I.2 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401] Status: In Compliance. No limits set in the AO were found exceeded at the time of inspection. I.3 Modifications to the equipment or processes approved by this AO that could affect the emissions covered by this AO must be reviewed and approved. [R307-401-1] Status: In Compliance. All modifications were addressed in an approved AO. I.4 All records referenced in this AO or in other applicable rules, which are required to be kept by the owner/operator, shall be made available to the Director or Director's representative upon request, and the records shall include the two-year period prior to the date of the request. Unless otherwise specified in this AO or in other applicable state and federal rules, records shall be kept for a minimum of two (2) years. [R307-401-8] Status: In Compliance. Records required to be kept by the AO were requested and were observed at the time of inspection. I.5 At all times, including periods of startup, shutdown, and malfunction, owners and operators shall, to the extent practicable, maintain and operate any equipment approved under this AO, including associated air pollution control equipment, in a manner consistent with good air pollution control practice for minimizing emissions. Determination of whether acceptable operating and maintenance procedures are being used will be based on information available to the Director which may include, but is not limited to, monitoring results, opacity observations, review of operating and maintenance procedures, and inspection of the source. All maintenance performed on equipment authorized by this AO shall be recorded. [R307-401-4] Status: In Compliance. Good air pollution control practices found in use at the time of inspection. I.6 The owner/operator shall comply with R307-150 Series. Inventories, Testing and Monitoring. [R307-150] Status: In Compliance. Source found properly reported in the Emissions Inventory. I.7 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns. [R307-107] Status: In Compliance. Section II: SPECIAL PROVISIONS II.A The approved installations shall consist of the following equipment: II.A.1 Clay Basin Well Field #2 Basin Wide 3 II.A.2 Dehydration unit capacity 6MMscfd Unit # 35 Location: 4,539,246 N., 649,263 E. Line Heater: 0.75 MMBtu/hr II.A.3 Dehydration units capacity 15 MMscfd Unit # 29 Location: 4,538,250 N., 653,441 E. Unit # 30 Location: 4,538,555 N., 650,506 E. Unit # 50 Location: 4,538,500 N., 650,281 E. II.A.4 Dehydration units capacity 20 MMscfd Unit W.G.#1C Location: 4,537,352 N., 653,556 E. Line Heater: 1.0 MMBtu/hr Unit #38 Location: 4,537,800 N., 652,200 E. Line Heater: 0.5 MMBtu/hr Unit #3 Location: 4,539,534 N., 651,031 E. Line Heater: 0.5 MMBtu/hr Unit W.G.#7C Location: 4,537,867 N., 649,713 E. Line Heater: 0.5 MMBtu/hr Unit #59 Location: 4,539,302 N., 649,717 E. Line Heater: 0.5 MMBtu/hr Unit #6 Location: 4,538,320 N., 652,915 E. Line Heater: 0.4MMBtu/hr II.A.5 Dehydration units capacity 30 MMscfd Unit W.G. #4 (new) Location: 4,537,811 N., 651,476 E. Line Heater: 2.2 MMBtu/hr Unit #39 Location: 4,538,163 N., 650,324 E. Line Heater: 2.0 MMBtu/hr Unit W.G. #2C Location: 4,537,800 N., 653,300 E. Line Heater: 0.4 MMBtu/hr Unit W.G. #9B Location: 4,539,211 N., 650,201 E. Line Heater: 0.4 MMBtu/hr 4 II.A.6 Dehydration units capacity 35 MMscfd Unit W.G. #15 Location: 4,538,963 N., 650,642 E. Line Heater: 1.0 MMBtu/hr Unit W.G. #2B Location: 4,537,806 N., 653,124 E. Line Heater: 0.4 MMBtu/hr Unit #54 Location: 4,538,002 N., 652,730 E. Stack Height of 10 meters from ground II.A.7 Grandfathered dehydration units #2 Location: 4,538,806 N., 651,031 E. #4 Location: 4,537,466 N., 651,472 E. #28 Location: 4,538,105 N., 652,208 E. #40 Location: 4,538,792 N., 649,464 E. W.G.# 1A Location: 4,537,668 N., 653,705 E. W.G.# 1B Location: 4,537,676 N., 653,732 E. W.G.# 2A Location: 4,537,835 N., 653,136 E. W.G.# 6 Location: 4,538,935 N., 650,217 E. W.G.# 7A Location: 4,538,528 N., 649,944 E. W.G.# 7B Location: 4,538,549 N., 649,974 E. W.G.# 9A Location: 4,539,182 N., 649,969 E. II.A.8 Produced Water Tank (new) Capacity: 1000 gallons Location: 4,537,811 N., 651,476 E. Status: In Compliance. No unpermitted equipment found onsite at the time of inspection. II.B Requirements and Limitations II.B.1 Dehydration Unit Requirements. II.B.1.a Opacity: Visible emissions from any dehydration unit listed in this permit shall not exceed 10% opacity. Opacity observations of emissions from stationary sources shall be conducted in accordance with 40 CFR 60, Appendix A, Method 9. [R307-401] Status: In Compliance. No visible emissions were observed at the time of inspection. II.B.1.b Questar shall not exceed 4000 hours per rolling 12-month period for each non-grandfathered dehydration unit listed in this permit. To determine compliance with a rolling 12-month total, Questar shall calculate a new 12-month total by the twentieth day of each month using data from the previous 12 months. Records of operation shall be kept for all periods when each dehydration unit is in operation. The records of hours of operation shall be kept on a monthly basis. [R307-401] Status: In Compliance. These records were reviewed and found compliant at the time of inspection. 5 II.B.2 Requirements on the 0.25 MMBTU/hr Dehydration unit #54. II.B.2.a The stack height shall be 10 meters or higher from ground level. [R307-401] Status: In Compliance. Proper stack heights were observed at the time of inspection. AREA SOURCE RULES EVALUATION: The following Area Source Rules were evaluated during this inspection: EMISSION INVENTORY: Emission Inventory Section R307-150: Status: In Compliance. Source not required to Report under R307-150 requirements. PREVIOUS ENFORCEMENT ACTIONS: No previous enforcement action has been taken in the last five years. COMPLIANCE STATUS & RECOMMENDATIONS: In regards to Approval Order (AO) DAQE-ANSR0141910002-10, dated July 8, 2010, the overall status is: In Compliance. Source found compliant at the time of inspection. ATTACHMENTS: None.