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HomeMy WebLinkAboutI202410 NOPV Response EXECUTIVE OFFICES INTERMOUNTAIN GAS COMPANY 555 SOUTH COLE ROAD-P.O.BOX 7608• BOISE,IDAHO 83707• (208)377-6000• FAX:377-6097 September 16,2024 Mr.Jeff Brooks,Programs Manager Idaho Public Utility Commission PO Box 83720 Boise,ID 83720-0074 Subject:Response to the Notice of Probable Violation dated August 5,2024(Report#I202410) Dear Mr.Brooks, This letter is intended to address one(1)notice of probable violation stemming from a construction inspection conducted by the Idaho Public Utilities Commission(IPUC)on July 24,2024,on service line 02251-621 of Intermountain Gas Company(IGC)pursuant of Chapter 601 Title,49,United States Code. PROBABLE VIOLATION 1. 49 CFR§ 192,605 Procedural manual for operations.maintenance.and emergencies. (a) General. Each operator shall prepare and follow for each pipeline,a manual of written procedures for conducting operations and maintenance activities and for emergency response.For transmission lines,the manual must also include procedures for handling abnormal operations. This manual must be reviewed and updated by the operator at intervals not exceeding 15 months,but at least once each calendar year.This manual must be prepared before operations of a pipeline system commence.Appropriate parts of the manual must be kept at locations where operations and maintenance activities are conducted. 2. OPS 307 Polyethylene(PE) Main and Service Construction 5.3. Connections shall be made by butt fusion or electrofusion. 5.3.1. Mechanical fittings may be used for connections when space does not allow the use of a butt fusion machine or electrofusion clamp,or when temperatures do not allow electrofusion. Finding(s)• IPUC staff observed a contractor for IGC build a service line on a trailer using(3)Continental Stab fittings and a 1/4"Met Fit Tee.Per OPS 307,connections shall be made by butt fusion or electrofusion,unless space does not allow the use of fusion machines and clamps.The majority of the service line was built on an open trailer with adequate space for butt fusions. Intermountain Gas Resgonse IGC acknowledges the findings brought forth by the IPUC.While butt fusion and electrofusion are the preferred connection methods, with IGC's current inventory of Continental Stab Fittings, it has been the intent to allow the fittings to be used in lieu of butt fusion or electrofusion in order to burn down the remaining inventory.OPS 307—Polyethylene(PE)Main and Service Construction has been revised to provide clarification on the use of Continental Stab Fittings. Please contact Josh Sanders at(701)222-7773 with questions or comments. Respectfully Submitted, Pat Darras Vice President,Engineering&Operations Services Intermountain Gas Company POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 1 of 32 PURPOSE This procedure details construction requirements for the installation of Polyethylene (PE) mains and service lines in MDU Utilities Group (MDUG)systems. REFERENCES External References: 49 CFR Part 192 Subpart F—Joining of Materials Other Than by Welding 49 CFR Part 192 Subpart G—General Construction Requirements for Transmission Lines and Mains 49 CFR Part 192 Subpart H—Customer Meters, Service Regulators, and Service Lines 49 CFR Part 192 Subpart M—Maintenance 49 CFT Part 192.283 Plastic pipe: Qualifying joining procedures ASTM 2620-19 - Standard Practice for Heat Fusion Joining of Polyethylene Pipe and Fittings GF Central Plastics Electrofusion Installation and Training Manual GPTC Guide Material 192.317 Protection from hazards GPTC Guide material 192.321 Installation of plastic pipe MNOPS 216G.07— Protecting Public Facilities and Agricultural Land National Electric Safety Code Rule 320135, 353, and 354 OAR 952-001-0070 (9) - Operators to Mark Underground Facilities or Notify Excavator that None Exist Plastics Institute Technical Report 33 (TR-33) Generic Butt Fusion Joining Procedure for Field Joining of Polyethylene Pipe WAC 480-93-115 -Casing of line pipes TR 33—Appendix A WAC 480-93-178- Protection of plastic pipe Internal References: CNG CP 860— Facilities Installation Diagram OPS 1 — Management of Change OPS 10—Gas Non-Emergency Notification and Reporting Requirements OPS 103— Pipe and Pipeline Components OPS 11 —Storage and Handling of Plastic Pipe and Components OPS 204—Qualifying Plastic Joiners OPS 301 — Excess Flow Valves OPS 302—Gas Service Line Siting and Meter Sets OPS 308—Gas Joint and Provided Trench Installations OPS 309—Squeeze Off of Plastic Pipe OPS 322—Trenchless Pipeline Installation OPS 323— Plastic Pipe Insertion OPS 324— Poly Vinyl Chloride (PVC)Joining and Repair OPS 325—Casing, Sleeve, and Polyethylene (PE) Insertion Installations OPS 327— Inspection, Evaluation, and Repair of Pipelines OPS 407— Exothermic Welding Connections to Steel Pipelines OPS 501 — Equipment Calibration, Maintenance, and Testing OPS 505— Pressure Testing OPS 603— Pipeline Purging and Cleaning OPS 611 —Line Locating and Marking OPS 625—Material and Construction Failure Reporting and Investigation Forms: CNG 315- Facilities Installation Diagram CNG 315R—Service Line Remediation Record CNG 336— Distribution Line Report Form 23007—Customer Load Summary IGC 319— Distribution Line Report IGC 457 - Report of Damage and/or Repair POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 2 of 32 IGC 512—Service Line Work Order MDU/GPNG Task TRAINING AND QUALIFICATION Training is required for personnel who install and relocate PE mains and service lines. Training shall be conducted by the Safety& Technical Training Department, or their designee. Subsequent training will be conducted by the employee's manager or designee. RECORD RETENTION Record Retention Period Storage Location Installation As-Built Documentation Life of pipeline Documentum or similar electronic repository. DEFINITIONS Refer to OPS 3 Master Glossary SCOPE This procedure applies to the installation and relocation of PE mains and service lines. Refer to OPS 327 — Inspection, Evaluation, and Repair of Pipelines for additional repair requirements. This procedure does not apply to PVC. Refer to OPS 324 - Poly Vinyl Chloride (PVC) Joining and Repair. PROCEDURE 1. Safety 1.1. When a potentially hazardous amount of gas is being vented into open air, sources of ignition shall be removed from the area. A fire extinguisher shall be available. 1.2. Refer to OPS 309—Squeeze-Off of Plastic Pipe prior to performing a squeeze-off. 2. Material Inspection 2.1. New Pipe and Fittings: 2.1.1. Pipe and fittings with gouges or scratches exceeding 10% of wall thickness shall not be installed. 2.1.2. Creased or folded material (e.g., kinked pipe) shall not be installed. 2.1.3. Each length of pipe and each fitting shall be visually inspected prior to installation to ensure that it has no damage or defects that could impair its serviceability. 2.1.4. Materials suspected of being damaged or defective shall not be installed. Damages or defects that did not occur during transportation, installation, or testing (e.g., damaged and defective material received from the manufacturer)shall be reported via a Material and/or Component Failure Report (MCFR) JIRA ticket. Contractors shall contact their MDUG representative (e.g., Field Operations Coordinator, Third- Party Inspector, local District Management, etc.) immediately after identifying a material failure. Refer to OPS 625—Material and Construction Failure Reporting and Investigation. 2.1.5. Defective or damaged pipe and fittings discovered prior to being placed into service shall be removed and discarded. 2.1.6. Refer to OPS 11 - Storage and Handling of Plastic Pipe and Components for loading, hauling, and unloading requirements. 2.2. In-Service Pipe and Fittings: 2.2.1. When inspecting for gouges or scratches on in-service pipe and fittings, refer to Appendix 1 of OPS 327— Inspection, Evaluation, and Repair of Pipelines, for pipe inspection criteria and replacement parameters. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 3 of 32 3. Cutting 3.1. When cutting pipe to length before fusing, the pipe shall be cut using cutting tools which do not introduce contamination to the pipe surfaces or the fusion equipment. Cutting shall be performed using hand saws, reciprocating saws, run-around pipe cutters, guillotine cutters, pipe sheers, or chain saws. 3.2. Liquid lubricants (for example, bar or chain oil or other lubricants)or soap transferred to the pipe ends during cutting, shall be removed per the Cleaning Section of this procedure. 4. Cleaning 4.1. Cleaning shall be performed per the manufacturer's instructions, or when butt fusing per TR- 33 Appendix A. 4.2. If contamination cannot be removed per the manufacturer's instructions, or when butt fusing per TR-33, wash the pipe with water and a clean cloth or paper towel, rinse the pipe with water, and dry thoroughly with a clean dry, lint-free, non-synthetic cloth such as cotton or paper towel. 4.3. If water or soap are used in the cutting process, the pipe surfaces shall be cleaned using isopropyl alcohol and allowed to dry prior to facing. 4.4. Lubricants such as chain oil or drilling lubricants such as bentonite shall be removed from the outside diameter and inside diameter of the fusion area with a 90% or greater isopropyl alcohol on a clean cloth or paper towel or isopropyl alcohol wipe prior to scraping or facing. 5. Pipeline Installation 5.1. Plastic joints shall be made with procedures qualified per the requirements of§192.283 Plastic pipe: Qualifying joining procedures. 5.1.1. The joining procedures referenced in this procedure are qualified per the requirements of§192.283 Plastic pipe: Qualifying joining procedures. The manufacture's qualifying procedure letters are available in the Guides & Resources section of the MDUG Policy& Procedure (P&P) SharePoint site. 5.2. Company and Contractor personnel shall be qualified per the requirements of OPS 204— Qualifying Plastic Joiners for applicable joining procedure being made (e.g., butt fusion, electrofusion, external compression ring mechanical fitting, stab-type mechanical fitting, or mechanical saddle). Each joint shall be visually inspected by the joiner or inspection personnel that have the training and experience to inspect the type of joint being made. 5.3. Connections should be made by butt fusion or electrofusion. 5.3.1. Mechanical fittings (e.g., Met Fits) may be used for connections when space does not allow the use of a butt fusion machine or electrofusion clamp, or when temperatures do not allow electrofusion or butt fusion. 5.3.2. Existing inventories of socket fusion fittings, and stab fittings (e.g., Continental Stab Fittings- Constab), may be used until current inventories are used and required butt fusion and electrofusion tooling is acquired, or December 31, 2026. 5.4. Production to in-service connections: 5.4.1. Production to in-service connections of pipe larger than two (2") inches in diameter shall be made with an electrofusion coupler. Production to in-service connection for pipe larger than two (2") inches in diameter shall not be butt fused. 5.4.2. Production to in-service connections of pipe two (2") inches in diameter and smaller shall be made with an electrofusion coupler, mechanical fitting, or butt fused. 5.4.3. Tie-ins for ongoing single projects (e.g., SSIP, Plats, Subdivisions) may be made by butt fusion. 5.5. Polyamide 11 (PA-11) and PE pipe shall not be joined to each other. 5.6. Plastic joining manuals, procedures, and specification are available in the Guides & Resources section of the MDUG P&P SharePoint site. Contractors can access manuals on the manufacturer's website. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 4 of 32 5.6.1. George Fischer Central Plastics Electrofusion Installation and Training Manual. 5.6.2. Innogaz Electrofusion System Installation Procedure. 5.7. Main and service line extensions from steel pipe shall be made with an approved fitting and transition. Unless approved by Corrosion Control, Engineering Services, or System Integrity, steel to plastic transitions shall be installed without a stiffener/protective sleeve. 5.7.1. Refer to OPS 327— Inspection, Evaluation, and Repair of Pipelines for existing (in- service)cathodic protection test reading requirements and coating condition, external condition, and internal condition inspection and documentation requirements. 5.8. Refer to OPS 308- Gas Joint and Provided Trench Installations for joint trench and customer provided trench installation requirements. 5.9. When inserting PE pipe into an abandoned steel pipeline, or when installing PE pipe in a sleeve or casing refer to OPS 325—Casing, Sleeve, and Polyethylene (PE) Insertion Installation. 5.10. Refer to OPS 327— Inspection, Evaluation, and Repair of Pipelines when temporary above ground installations are required. 5.11. Butt fusions shall be made in accordance with TR-33 Appendix A. NOTE: TR-33 was used to develop ASTM 2620-19, making the level of safety in TR-33 equivalent to that of ASTM 2620-19. 5.11.1. New procedures require an MOC. Refer to OPS 1 — Management of Change. 5.11.2. MDPE may be butt fused to HDPE. 5.11.2.1. Connections (e.g., cross fusions) to Dupont Aldyl A MDPE, Uponor Aldyl A MDPE and Phillips Driscopipe 7000 and 8000 HDPE shall not be made by butt fusion. 5.11.3. Butt fusion is not recommended below negative 4°F without special provisions such as a heated portable shelter(e.g., tent or trailer). 5.11.4. Protect fusion heater plates and fusion surfaces from unacceptable temperature variations and possible contamination from wind and rain as needed. 5.11.5. Butt fusions made in ambient temperatures of 100°F and higher require additional cooling time while in the clamp. The clamp shall not be removed until the fusion bead is cool to the touch. 5.11.6. Avoid rough handling, pulling, installation and pressure testing for a minimum of an additional 30 minutes after fusion has properly cooled. 5.11.7. A butt fusion joint shall be joined by a tool that holds the iron square to the ends of the piping, compresses the heated ends together, and holds the pipe in proper alignment while the plastic hardens. 5.11.8. Hydraulic butt fusion machine pressures shall be set using the butt fusion machine manufacturer's recommendation for specific machine settings. 5.11.9. Heating tools shall be equipped with a thermometer or other built-in temperature indicating device. Before the first fusion of the day, actual surface temperature of the heater plate or adapter surface shall be checked with a pyrometer(infrared or surface) calibrated per the requirements of OPS 501 - Equipment Calibration, Maintenance, and Testing. The actual temperature of the heater plate or adapter surface should be checked periodically through the day. 5.12. Electrofusion(s)shall be made in accordance with manufacturer specifications and procedures. 5.12.1. Electrofusion fittings shall not be installed when ambient temperatures are below negative 10°F or greater than 120°F. 5.12.2. Scraping/peeling shall be completed with an approved scraping tool. Scraping shall not be performed with sandpaper, utility/emery cloth, wood rasps, metal files, or grinders. A paint scraper should only be used in situations where confined working space (e.g., proximity to other structures and utilities) requires a hand tool. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 5 of 32 5.12.3. Assure a minimum depth of.007"was scraped/peeled using one of the following methods: 5.12.3.1. Preferred method: Physically scribe a scraping depth indicator mark, or witness mark with an approved scribe tool (e.g., Marksman 007), onto the pipe surface at intervals around the pipe. This mark scribes the pipe surface to the depth of at least .006"while not removing more than 10% of the pipe wall thickness. Removal of the minimum amount of.007"when scraping/peeling will remove the scribe mark and provide visual confirmation that adequate pipe surface has been removed by scraping. 5.12.3.2. Optional method: Mark the area to be peeled with an oil free permanent marker at intervals around the pipe. Allow marks to dry before peeling. After scraping/peeling witness marks shall be completely removed. 5.12.3.3. Optional method: Measure the thickness of the ribbon peeled for the pipe with a micrometer calibrated per the requirements of OPS 501 - Equipment Calibration, Maintenance, and Testing. The ribbon shall be at least .007" but less than 10% of wall thickness of the pipe. 5.13. Mechanical joints or fittings installed after January 22, 2019, shall be Category 1 joint as defined in ASTM F1924-12, providing a seal plus resistance to a force on the pipe joint equal to, or greater than, that which will cause no less than 25% elongation of pipe, or the pipe fails outside the joint area if tested. 5.13.1. Mechanical connections shall be made in accordance with manufacturer specifications and procedures. 5.13.2. Stab type mechanical fittings shall not be installed after December 31, 2024. 5.14. Pipelines shall be protected from washouts, floods, unstable soil, landslide, and other hazards that may cause the pipe to move or sustain abnormal loads. 5.14.1. Where pipelines cross areas that are not normally under water but are subject to periodic run-off or flooding (e.g., near a river or runoff), the depth should be increased to protect the pipeline from expected scour(washout), such as that expected from a 100-year flood. 5.14.2. When pipelines are installed over landfill areas where the supporting fill may decompose, contact Engineering Services for pipe support requirements. 5.15. Pipelines shall not be permanently installed aboveground, either exposed or in a casing or sleeve, or in a below grade enclosure or vault. Valve boxes are excluded from this requirement. 5.16. Examples of trench configurations are shown in Appendices 4-15. Joint trench configurations may vary with the addition or exclusion of other utilities. The selected joint trench configuration shall meet the requirements of the utilities sharing the trench and easement, city, county, or state requirements. The following are the minimum radial separation distances of utilities (e.g., horizontal/perpendicular crossings and paralleling main/service): 5.16.1. PE pipelines should be installed with at least four(4") inches of clearance from other underground utilities, (excluding electric) and structures. For electric clearance requirements refer to Section 5.16.2. 5.16.1.1. If minimum clearance cannot be attained, the pipeline shall be protected from damage that might result from its proximity to other structures and utilities, excluding electric. For electric clearance requirements refer to Section 5.16.2. Examples of protective measures are placing sandbags, rock shield, PVC, or FRP half sleeve between the pipe and the foreign utility to prevent contact and wear. 5.16.1.2. In WASHINGTON, plastic pipelines paralleling other utilities shall have a minimum of 12" of separation from the other utilities, and plastic pipelines perpendicular(e.g., crossing)to other utilities shall have a minimum of six (6") inches of clearance of separation from other utilities, excluding electric. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 6 of 32 For electric clearance requirements refer to Section 5.16.2. Where minimum separation is not possible, adequate precautions, such as inserting the plastic pipeline in conduit, shall be taken to minimize potential hazards resulting from the close proximity to the other utilities. 5.16.2. At least 12"separation should be maintained when crossing or paralleling electric(direct bury or in conduit). 5.16.2.1. When 12"separation cannot be maintained, mechanical protection is to be used to limit the likelihood of detrimental heat transfer to gas facilities. Examples of protective measures are placing sandbags, rock shield, PVC, or FRP half sleeve between the pipe and the foreign utility to prevent contact and wear. 5.16.2.2. Electric separation should be discussed with all parties involved prior to installation. 5.16.3. Service lines may be installed in a sleeve or by bore with communication conduits(e.g., phone, cable,fiberoptic, etc.). Minimum separation should be maintained outside of the sleeve or bore, see Appendices 10-15. Service lines shall not be installed in a sleeve or by bore with electric. 5.17. Pipelines shall not be installed within the influencing area (typically 10') of any system that radiates temperatures above 100°F. If there is a concern that this may occur, contact Engineering Services. 5.18. Pipelines shall not be installed or operated under enclosed structures without approval from Engineering Services and the installation of proper casings, seals, and vents. Refer to OPS 302—Gas Service Line Siting and Meter Sets for service line requirements. 5.19. Pipelines installed in a navigable stream, river, or harbor shall be installed with a minimum cover of 48", or 24" in consolidated rock, from the top of pipe and the underground natural bottom and shall meet permitting agency requirements. 5.20. Two (2") inch and smaller pipe should be snaked in the trench to allow for movement of the pipe. 5.21. Each field bend of PE pipe shall comply with the following: 5.21.1. PE pipe shall not be installed with a bend radius that is less than the minimum bend radius specified by the manufacturer for the diameter of the pipe being installed. 5.21.2. Each bend shall have a smooth contour and be free from buckling, cracks, or other mechanical damage. 5.21.3. Lengths of PE pipe installed without fittings shall not be bent to a radius smaller than the following minimum values: Pie Minimum Allowed Bend Radius 2" IPS 5' 4" IPS 10, 6" IPS 14' 8" IPS 18' 5.21.4. Lengths of PE pipe installed with fittings(e.g., couplers, in-line tees, etc.)shall not be bent to a radius smaller than the following minimum values: Pipe with Fittings Minimum Allowed Bend Radius 2" IPS 20' 4" IPS 38' 6" IPS 56' 8" IPS 72' 5.22. Cover and Backfill: POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 7 of 32 5.22.1. Backfill, including compaction specifications, shall be performed per the requirements of governing/permitting agencies. 5.22.2. Mains shall be installed with a minimum of 30"of cover in soil or 24" in consolidated rock. 5.22.2.1. Service lines converted to main do not require the minimum depth requirements in Step 5.22.1. Refer to Company procedures and practices for service line conversions. 5.22.2.2. When required by the permitting agency, the main or service line shall be installed at the depth required by the permitting agency. 5.22.2.3. Mains and service lines installed in cultivated agricultural areas should have a minimum of 54" of cover at the time of installation. 5.22.2.3.1. Where an underground structure prevents installation at those depths, the service line shall be able to withstand anticipated external loads. 5.22.2.4. In Minnesota, mains and service lines installed in cultivated agricultural areas shall have a minimum of 54" of cover at the time of installation. 5.22.2.4.1. Where an underground structure prevents installation at those depths, the service line shall be able to withstand anticipated external loads. 5.22.3. Bottom of ditch shall be clean and free of rock or other hard objects. The pipe shall be uniformly and continuously supported over its entire length on firm stable material. 5.22.3.1. When native material is not clean and free of rock or debris, pipe shall be bedded with six (6") inches of bedding material that consist of well graded from course to fine, non-corrosive sand, or non-fractured gravel not exceeding one-fourth (1/4") inch minus in size (typically sand). 5.22.4. Ensure the ditch wall is clean and free of rock or other hard objects. If the ditch wall adjacent to the pipe is not clean and free of rocks or other hard objects, maintain three (3") inches from the ditch wall. 5.22.5. Pipe shall be shaded with six(6") inches of material that is clean and free of rock and debris. 5.22.5.1. When native material is not clean and free of rock or debris, pipe shall be shaded with six (6") inches of shading material that consist of well graded from course to fine, non-corrosive sand, or non-fractured gravel not exceeding one-fourth (1/4") inch minus in size (typically sand). 5.22.6. Except for purge locations, distribution pipelines shall be shaded with six (6")inches of cover prior to pressure testing. Refer to OPS 505—Pressure Testing or contact Engineering Services for high pressure pipeline and transmission pipeline requirements. 5.22.7. When required by the permitting agency, warning tape shall be installed approximately 18" below finish grade. 5.22.8. Native soil may be used to backfill the remainder of the trench unless other materials are specified by the permitting agency or property owner. Final backfill should not include trash and debris. 5.22.9. In all states, except Oregon if determined to be necessary by Field Operations, upon completion of installation of underground facilities, the facilities shall be marked per the requirements of OPS 611 — Line Locating and Marking prior to leaving the job site. 5.22.9.1. In Oregon, in areas of ongoing excavation or construction, operators must mark newly installed underground facilities immediately upon placement. As per the requirements of OPS 611- Line Locating and Marking. 5.23. Standard Service Line Installations: 5.23.1. Standard service line diameter is three-fourths (1/") inch IPS unless one (1") inch, two (2") inch, or four(4") inch is specified on the Customer Load Summary— Form 23007, POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 8 of 32 or when a larger diameter is required per OPS 301 - Excess Flow Valves. Refer to OPS 301 - Excess Flow Valves for EFV and service line sizing requirements. 5.23.1.1. Low pressure and five (5) psig distribution pressure service lines shall be sized per the following tables. Low Pressure System (< one (1) psig) Service Line Capacity In Cubic Feet Per Hour with a Pressure Drop of 0.3 Inches Water Column Length of Service Nominal Pipe Size Inches Line (Feet) 3/" 1" 2" 20 215 400 1,950 30 170 315 1,550 40 145 265 1,300 50 125 235 1,150 60 115 210 1,050 70 110 190 975 80 105 175 905 90 100 166 845 100 95 155 795 125 90 140 700 150 85 135 630 175 80 125 575 200 70 120 530 Contact Engineering Services for Service Lines longer than 200' or larger than two (2") inches. Assumes a minimum main pressure of five 5" Inches Water Column and IPS SDR-11 plastic pipe. Five (5) psig Distribution Pressure System Service Line Capacity in Cubic Feet Per Hour with a Pressure Drop of 0.3 psig Length of Service Nominal Pipe Size (Inches) Line (Feet) %11 1" 2" 20 1,585 2,700 8,850 30 1,260 2,300 8,800 40 1,070 1,950 8,700 50 945 1,700 8,450 60 850 1,550 7,600 70 780 1,400 7,000 80 725 1,300 6,500 90 675 1,200 6,050 100 635 1,150 5,700 125 560 1,000 5,050 150 505 925 4,550 175 460 850 4,200 200 430 785 3,850 Contact Engineering Services for Service Lines longer than 200' or larger than two (2")inches. Assumes a minimum main pressure of three 3psig and IPS SDR-11 plastic pipe. 5.23.2. Service lines less than two (2") inches in diameter shall have at least 18" cover on private property and at least 24" cover in the right-of-way (ROW). 5.23.2.1. A minimum 24" of cover is preferred over service lines on private property and in the ROW in non-rock type soil. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 9 of 32 5.23.2.2. In consolidated rock, service lines shall be installed with a minimum of 18" of cover in the ROW and 12" cover on private property. Caliche is not considered consolidated rock. 5.23.2.3. Exceptions to minimum cover in non-rock type soils require the approval of local Field Operations Management and the Engineering Services, or System Integrity Manager. The approval shall be documented on the service line As-Built. 5.23.2.4. When required by the permitting agency, the service line shall be installed at the depth required by the permitting agency. 5.23.2.5. Service lines two (2") inches and larger in diameter should be installed at main depth requirements. Exception to this step would include areas near the riser where depth may be less than main depth requirements due to bury line requirements of anodeless service risers. 5.23.2.6. For cultivated agricultural areas refer to the Cover and Backfill Section of this procedure. 5.23.3. Beginning December 31, 2024, three-fourths (3/4") inch, one (1") inch, and two (2") inch service line extensions from PE main shall be made with electrofusion service punch tees, unless approved by Engineering Services. 5.23.3.1. Service lines extending from PE main may be installed with in-line tees. 5.23.4. Three-fourths (3/4") inch connections shall be made by butt fusion. 5.23.4.1. Mechanical fittings may be used when space does not allow the use of a butt fusion machine. 5.23.5. One (1") inch and larger connections shall be made by butt fusion or electrofusion. 5.23.5.1. Mechanical fittings may be used when space does not allow the use of a butt fusion machine or electrofusion clamp. 5.23.6. Standard installation height for anodeless service risers (ASR) is determined by the manufacturers DO NOT BURY line recommendations. The DO NOT BURY line (e.g., Red Line) shall be above final grade. Allow room for future fill or landscape. Refer to OPS 302—Gas Service Line Siting and Meter Sets. 5.23.7. Refer to OPS 302—Gas Service Line Siting and Meter Sets when an ASR riser is likely to be set in a hard surface (e.g., concrete or asphalt). Stiffeners are not required at the pigtail of an ASR. 5.24. Exhibit 1 outlines potential inspectable items. 6. Tracer Wire and Locate Test Stations 6.1. PE pipe shall be installed with a minimum 14-gauge wire. Refer to OPS 103— Pipe and Pipeline Components and OPS 322—Trenchless Pipeline Installation for trenchless installation wire requirements. 6.2. Tracer wire connections shall be made with MDUG approved connectors. 6.3. Tracer wire shall not be brazed or soldered. 6.4. Tracer wire shall be connected in a way to protect the connection for pulling/tension, typically by wrapping the wire around the pipe with a half hitch. 6.5. Transition fitting tracer wire connections shall be made with the supplied tracer wire connection or exothermic weld (e.g., cad weld). Refer to OPS 407 - Exothermic Welding Connections to Steel Pipelines. 6.6. Transition fitting tracer wire for main shall terminate into an above ground or flush mount locate test station. A test lead from the steel main connection shall terminate in the same locate test station. The PE tracer wire and the lead from the steel main should not be connected to the same locate test station terminal. Wire configurations shall be installed per brand specific standards. Refer to Appendix 1 —CNG, MDU, and GPNG Transition Fitting POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 10 of 32 Tracer Wire Configuration. In IDAHO refer to Appendix 2 — IGC Transition Fitting Tracer Wire Configuration. 6.7. Tracer wire at end of mains shall terminate above ground. 6.7.1. If the end of main terminates under a hard surface (e.g., asphalt or concrete), the tracer wire should terminate in a flush-mount locate test station. 6.7.2. An underground locate device (e.g., zinc locate coupon, magnesium anode or marker ball)should be installed at the end of main. 6.7.2.1. The connection shall be spliced below ground as near the end of main as possible. 6.7.2.2. The location of the underground locate device shall be identified on the As- Built drawing. 6.8. Transition fitting tracer wire for service lines shall be directly connected to the transition fitting. 6.8.1. A locate coupon or magnesium anode should be installed at the base of the ASR. 6.8.1.1. Install locate coupon in the same trench as the service line without allowing the coupon to be in direct contact with the ASR. 6.8.1.2. The location of the locate coupon/magnesium anode shall be identified on the As-Built drawing. 6.8.2. Refer to Appendix 3— MDUG PE Service Line with Steel Main Wire Configuration. 6.9. A locate test station shall be installed approximately every 1000', but no further than 1500' apart. 6.9.1. A zinc coated locate coupon or magnesium anode should be installed at test stations or at tie-in locations to existing systems on main extensions when under 1000 feet. 6.9.2. Locate coupon/magnesium anode wire lead shall terminate in the test station. A single locate wire shall be spliced into the PE tracer wire and terminate in the same test station. Locate coupon/magnesium anode wire lead and PE tracer wire shall not be spliced together below ground. 6.9.3. New main with service lines spaced less than 1000' (e.g., plats, subdivisions)do not require test stations. 6.9.4. The location of the locate coupons/ magnesium anodes and locate test stations shall be identified on the As-Built drawing. 6.10. Wire should be installed immediately adjacent to the pipe or separated approximately two (2") inches to six (6") inches from the pipe. Wire should not be wrapped around the pipe, including wire connections (half hitch). Except for trenchless installations, wire should not be taped to the pipe. Refer to OPS 322 —Trenchless Pipeline Installation. 6.11. A continuity check of tracer wire (e.g., line locate) should be made after pipeline installations. 6.11.1. New wire connections that do not have continuity shall be repaired. Existing wire or wire connections that do not have continuity shall be reported to local Field Operations Management, or their designee. 7. Care and Maintenance of Tools 7.1. Equipment used in joining PE pipe shall be maintained in accordance with the manufacturer's recommended practices or procedures. 7.2. Heat fusion equipment shall be free of rust, corrosion, dirt, and/or molten plastic residue that can impair the quality of fusion joints. 7.3. After each use, remove melt residue from the heater surface with a soft wooden stick or by wiping with a clean dry, lint-free, non-synthetic cloth such as cotton or paper towel. 7.4. Faceplates shall not be changed while the tool is hot. Bolts should be tightened carefully to prevent stripping. High temperature anti-seize lubricant should be used on faceplate bolts to minimize galling. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 11 of 32 7.5. Malfunctioning equipment shall not be used and will be repaired or replaced. 8. Documentation 8.1. As-Built documents shall be completed in accordance with MDUG Gas As-Built Documentation Guidance Document located on the P&P SharePoint site. 8.2. Cascade Natural Gas: 8.2.1. Main installation shall be documented on CNG 336— Distribution Line Report. 8.2.2. Service Line installation and relocations shall be documented per the requirements of CNG CID 860— Facilities Installation Diagram. 8.3. Intermountain Gas: 8.3.1. Main installation, including relocations 15' or longer, shall be documented on IGC 319— Distribution Line Report. 8.3.2. Service line installations and relocations shall be documented on IGC 512—Service Line Work Order. 8.3.3. Main relocation less than 15' shall be documented on IGC 457—Report of Damage and/or Repair. 8.4. Montana-Dakota Utilities and Great Plains Natural Gas: 8.4.1. Main and service line installations and relocations shall be documented in PCAD and when applicable Task Forms. 8.5. Documentation not completed on As-Built documents shall be documented in approved compliance tracking software (e.g., Maximo). POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 12 of 32 Appendix 1 -CNG, MDU, and GPNG Transition Fitting Tracer Wire Configuration CNG, MDU & GPNG TRANSITION FITTING MARKER TEST STATION WITH PE TRACER WIRE ANODE TEST HEAD DETAIL PE TRACF MARKER TEST STATION STEEL ItA..� WITH TEST LEADS 0 ANODE `EAD 0 0 O C GRADE a PLACEMENT DETAIL � J d �] d O � ! PE PIPE 6" Min. O STEEL TRACE HARE O .1 ANON J J TRACE HARE CONNECTION LUG ?E TRACE WRE STEEL PF ANODE TRANSITION NON-CONTROLLABLE nTTINC 24 Alin. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 13 of 32 Appendix 2—IGC Transition Fitting Tracer Wire Configuration IGC STANDARD INSTALLATION FOR STEEL TO PLASTIC TIE-IN WITH ANODE WIRE COLORS WHITE/RED: STEEL YELLOW: PLASTIC BLACK: ANODE O WIRING MALONEY: OPTION #1 TEST POST WIRE JUMPER TOP: STEEL LEAD'S ON OUTSIDE MIDDLE: ANODE LEAD CONNECTED ON INSIDE BOTTOM: PLASTIC LEAD WIRING MALONEY: OPTION #2 TOP: STEEL ANODE LEAD'S O CONNECTED ON INSIDE BOTTOM: PLASTIC LEAD GROUND LEVEL ip 2 WIRE LEADS "7 FROM STEEL LOCATING WIRE FOR PLASTIC STEEL PIPE PLASTIC PIPE TRANSITION FITTING a WIRE FROM ANODE ANODE POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 14 of 32 Appendix 3—MDUG PE Service Line with Steel Main Wire Configuration srwa. Wrap wire around riser Note: oo Nor BURY line shall be above final grade. o, �b Tina/Drade rifle/Grade 1 Note: When an optional locate coupon is used, install theJ­W locate coupon in /he some trench as the service line. Donotallow the coupon to be in direct contact with the onode/ess meter riser.Tracer wirer connection or exothermic weld JTracer Wlre Anode%ss� I!x rS,A.ml Svrvlce rronsNhn Tee Service Riser o-iCe rN and Slow/to Nc Trans/Non FJII/np soo'e ao.n .nr 4DU UTILITIES CROUPM-21Ch-h A 400 N 40,staN01lain D, STEEL TO P.E. SERWCE TRANSIMV rTMW AND 0noevnq NYTDo 6'339 TRACER WIRE CONN£CRON POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 15 of 32 APPENDIX 4 - HORIZONTAL LOT SIDE W/PRIMARY DISTRIBUTION ELECTRIC FEEDER COT SIDE STREET SIDE DEPENDING ON UTILITIES 30%48" w t- - - O z WARNING TAPE--- __--__ w w WHEN REQUIRED = v — — X O _ GAS COMMS ELEC, Z =I 4"MIN. Utility a 12"MIN FOR Owner Set WASHINGTON I ELEC r SEDER 12" MIN. NOTES: 1. NATIVE SOIL OR SELECTED BACKFILL. 2_ 6"OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY. IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3'BETWEEN DITCH WALL AND EDGE OF PIPE. 3. D-P.REQUIRES 30"MINIMUM COVER(24"IN CONSOLIDATED ROCK). H.P.REQUIRES ENGINEERING SERVICES OR SYSTEM INTEGRITY APPROVAL AND 36"MINIMUM COVER_ Drawn: J WOKOJANCE Date:9127123 Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 16 of 32 APPENDIX 5 - STACKED STREET SIDE STREET SIDE LOT SIDE —I I—III—_ III I I III — 24" — ___ WARNING TAPE -I WHEN REQUIRED 4"MIN. ST LIGHT _ 17 MIN FOR _ WASHINGrON _— COMMS z = GAS _ z - i f 12"MIN. or Utility Owner set NOTES: 1. NATIVE SOIL OR SELECTED BACKFILL. 2_ 6'OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY. IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN W BETWEEN DITCH WALL AND EDGE OF PIPE. 3. D-P.REQUIRES 30"MINIMUM COVER(24"IN CONSOLIDATED ROCK). H.P.REQUIRES ENGINEERING SERVICES OR SYSTEM INTEGRITY APPROVAL AND 36"MINIMUM COVER. Drawn: J WOKOJANCE Date:9127/23 Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PRO`IDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 17 of 32 APPENDIX 6 - HORIZONTAL STREET SIDE STREET SIDE LOT SIDE _III III —1II II lb I 36" - -I I MIN. WARNING TAPE WHEN REQUIRED - ST LIGHT — - GAS — ELEC .12 � — -' I I III I I=1 I I I I=1 I I- 4"MIN. 12" 12" 12"MIN FOR or Utility Owner or Utility WASHhGrCN Set Owner Set 12" MIN NOTES: 1. NATIVE SOIL OR SELECTED BACKFILL. 2. 6.OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY. IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3'BETWEEN DITCH WALL AND EDGE OF PIPE. 3. D.P.REQUIRES 30"MINIMUM COVER(24"IN CONSOLIDATED ROCK). H.P.REQUIRES ENGINEERING SERVICES OR SYSTEM INTEGRITY APPROVAL AND 36"MINIMUM COVER. Drawn: J WOKOJANCE Date:9/27/23 Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services A royal:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 18 of 32 APPENDIX 7 - STACKED LOT SIDE LOT SIDE STREET SIDE co Z w w z o J WARNING TAPE Z ------- -------- , WHEN REQUIRED O U Z GA S N 12 ! 3 { 0 g� COMMS ELEC ` 36" NOTES- 1- NATIVE SOIL OR SELECTED BACKFILL. 2_ 6'OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY_ IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3'BETWEEN DITCH WALL AND EDGE OF PIPE. 3. D-P.REQUIRES 30"MINIMUM COVER(24"IN CONSOLIDATED ROCK). H.P_REQUIRES ENGINEERING SERVICES OR SYSTEM INTEGRITY APPROVAL AND 36"MINIMUM COVER_ Drawn: J WOKOJANCE Date:9t27123 Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 19 of 32 APPENDIX 8 - STACKED STREET SIDE STREET SIDE LOT SIDE bo z z o z o J ________ WARNING TAPE _ ______ M z WHEN REQUIRED o z GAS N 1 z ' V g COMMS ELEC -- 36" NOTES: 1. NATIVE SOIL OR SELECTED BACKFILL. 2_ 6'OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY_ IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3'BETWEEN DITCH WALL AND EDGE OF PIPE_ 3. D-P.REQUIRES 30"MINIMUM COVER(24"IN CONSOLIDATED ROCK). H.P_REQUIRES ENGINEERING SERVICES OR SYSTEM INTEGRITY APPROVAL AND 36"MINIMUM COVER_ Drawn:J WOKOJANCE Date:9/27f23 Engineer: DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 20 of 32 APPENDIX 9 - TRENCHED/ROCK SAW DITCH TRENCH WIDTH MAY VARY 0 =1I = ___ WARNING TAPE ___ WHEN REQUIRED = 8 z a N = _ O ------------ a __________.. O Z u_ N _Z ELEC NOTES: 1. NATIVE SOIL OR SELECTED BACKFILL. 2. 6.OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY_ IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3"BETWEEN DITCH WALL AND EDGE OF PIPE. 3. D.P.REQUIRES 30"MINIMUM COVER(24"IN CONSOLIDATED ROCK). H.P_REQUIRES ENGINEERING SERVICES OR SYSTEM INTEGRITY APPROVAL AND 36"MINIMUM COVER_ Drawn: J WOKOJANCE Date:9/2723 Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 21 of 32 APPENDIX 10 Typical Gas Service Line joint trench including Gas, secondary electric and Communications Private Property ! Stacked -�-- .� _ > 00 G $ j t - Trench width to vary. a N C � :o I I � O GAS I H { c O Z ` v 4"MIN. Ua1dy 12"MIN FOR WAMNGTON 12" NOTES- Min. 1. NATIVE SOIL OR SELECTED BACKFILL. 2- 6"OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY. IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3"BETWEEN DITCH WALL AND EDGE OF PIPE. 3. 2"AND LARGER SERVICE TO BE INSTALLED AT MAIN DEPTH REQUIREMENTS.EXCEPTION TO THIS STEP WOULD INCLUDE AREAS NEAR THE RISER WHERE DEPTH MAY BE LESS THAN MAIN DEPTH REQUIREMENTS DUE TO BURY LINE Drawn: J WOKOJANCE Date:9/27/23 REQUIREMENTS OF ANODELESS RISERS. Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 22 of 32 APPENDIX 11 Typical Gas Service Line joint trench including Gas. secondary electric and Communications ROW ! Stacked o Trench width to vary .�. • A•• •.g• • .•P' GAS COMMS ELEC 2 Z O z — v 4" MIN. utility 12"MIN FOR WASHINGTON 12" NOTES- Min- 1. NATIVE SOIL OR SELECTED BACKFILL. 2. 6-OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY. IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS. MAINTAIN 3'BETWEEN DITCH WALL AND EDGE OF PIPE. 3. 2"AND LARGER SERVICE TO BE INSTALLED AT MAIN DEPTH REQUIREMENTS.EXCEPTION TO THIS STEP WOULD INCLUDE AREAS NEAR THE RISER WHERE DEPTH MAY BE LESS THAN MAIN DEPTH REQUIREMENTS DUE TO BURY LINE Drawn: J'WOKOJANCE Date:9/27/23 REQUIREMENTS OF ANODELESS RISERS. Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIE Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 23 of 32 APPENDIX 12 Typical Gas Service Line joint trench including Gas, secondary electric and Communications Private Property i Horizontal g y I Q Trench vlfidth to vary,' a) • F r•. J SAS COMMS aEC w 4"MIN. Utility 17 MIN FOR WASHINGTON 12" NOTES- Min. 1. NATIVE SOIL OR SELECTED BACKFILL. 2_ 6"OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY. IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3"BETWEEN DITCH WALL AND EDGE OF PIPE. 3. 2'AND LARGER SERVICE TO BE INSTALLED AT MAIN DEPTH REQUIREMENTS.EXCEPTION TO THIS STEP WOULD INCLUDE AREAS NEAR THE RISER WHERE DEPTH MAY BE LESS THAN MAIN DEPTH REQUIREMENTS DUE TO BURY LINE Drawn: J WOKOJANCE Date:9127/23 REQUIREMENTS OF ANODELESS RISERS. Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 24 of 32 APPENDIX 13 Typical Gas Service Line joint trench including Gas, secondary electric and Communications ROW/ Horizontal �` i it �I`` . ''f: .� ' •''. I . > ° 1 .. . a N 0 I Trench width to vary ) � L O GAS`', COMMS aEC } 4"MIN. Utility 12"MIN FOR WASHINGTON 12" NOTES: Min. 1_ NATIVE SOIL OR SELECTED BACKFILL. 2_ 6"OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY, IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3"BETWEEN DITCH WALL AND EDGE OF PIPE. 3. 2"AND LARGER SERVICE TO BE INSTALLED AT MAIN DEPTH REQUIREMENTS.EXCEPTION TO THIS STEP WOULD INCLUDE AREAS NEAR THE RISER WHERE DEPTH MAY BE LESS THAN MAIN DEPTH REQUIREMENTS DUE TO BURY LINE Drawn: J WOKOJANCE Date:9l27123 REQUIREMENTS OF ANODELESS RISERS. Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services A royal:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 25 of 32 APPENDIX 14 Typical Gas Service Line joint trench including Gas, secondary electric and Communications Private Property!Trenched 1 Rock Saw Ditch 1• I ED a C i o C ' Trench width to vary O', C4 Q� � rV.. I o I COMMS pi I ) ELEC NOTES- 1- NATIVE SOIL OR SELECTED BACKFILL. 2. 6-OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY- IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3"BETWEEN DITCH WALL AND EDGE OF PIPE. 3. 2"AND LARGER SERVICE TO BE INSTALLED AT MAIN DEPTH REQUIREMENTS.EXCEPTION TO THIS STEP WOULD INCLUDE AREAS NEAR THE RISER WHERE DEPTH MAY BE LESS THAN MAIN DEPTH REQUIREMENTS DUE TO BURY LINE Drawn: J WOKOJANCE Date:9/27123 REQUIREMENTS OF ANODELESS RISERS. Engineer. DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services Approval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date: Sept. 16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 26 of 32 APPENDIX 15 Typical Gas Service Line joint trench including Gas. secondary electric and Communications ROW 1 Trenched 1 Rock Saw Ditch N Trench width to vary , o Q LL ;0 ��-- �_� L 0 COMMS T C ELEC NOTES- 1- NATIVE SOIL OR SELECTED BACKFILL. 2_ 6"OF ACCEPTABLE MATERIAL OR SAND AROUND PIPE WHERE NECESSARY. IF DITCH WALL ADJACENT TO THE PIPE IS NOT CLEAN AND FREE OF ROCKS OR OTHER HARD OBJECTS, MAINTAIN 3"BETWEEN DITCH WALL AND EDGE OF PIPE_ 3. 2"AND LARGER SERVICE TO BE INSTALLED AT MAIN DEPTH REQUIREMENTS.EXCEPTION TO THIS STEP WOULD INCLUDE AREAS NEAR THE RISER WHERE DEPTH MAY BE LESS THAN MAIN DEPTH REQUIREMENTS DUE TO BURY LINE Drawn: J WOKOJANCE Date:9/27J23 REQUIREMENTS OF ANODELESS RISERS. Engineer: DRAFTING SERVICES GAS MAY BE PLACED ON A LEVEL ABOVE ALL OTHER UTILITIES Construction Services A roval:OPSMOC-1780 PROVIDED 12"VERTICAL SEPARATION IS MAINTAINED. Drawing Name:JOINT&PROVIDED TRENCH POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 27 of 32 EXHIBIT 1 Quality Inspection Protocol Checklist OPS 307 Acceptance Criteria for Conforming Work Related Section Quality Protocol 2_1 a) Polyethylene (PE) pipe containing scratches exceeding 10% of wall QIP 024 thickness are not installed. b Fittings or pipe containing creases or folds are not installed. 4_1 a) Area to be joined is cleaned inside and out with a clean, lint free QIP 040 Butt Fusion cloth. 4_1 a) From each pipe end, an area approximately 2 times the fitting length QIP 041 GFCP is cleaned with approved cleaning agent. Coupling b After cleaning, no visible debris remains on the surfaces to be fused. 4.1 a) Fitting and area of pipe to be joined is cleaned with clean, lint free QIP 045 Socket cloth. Fusion b) When contamination is present on pipe, it is cleaned with isopropyl alcohol. 4.1 a) At the saddle tee installation location, an area of pipe approximately QIP 049 GFCP 3 times the fitting length is cleaned with approved cleaning agent. Saddle Tee b After cleaning, no visible debris remains on the surfaces to be fused. 4.1 a) From each pipe end, an area approximately 2 times the fitting length QIP 051 Innogaz is cleaned with an isopropyl alcohol impregnated towel. QIP 052 b After cleaning, no visible debris remains on the surfaces to be fused. 4_3 a) When soap or water are used to clean pipe during cutting, pipe QIP 040 surface is cleaned with isopropyl alcohol before facing. 4_4 a) If drilling lubricants were used, the outside and inside diameter of QIP 040 the fusion area is cleaned using 90% or greater isopropyl alcohol. QIP 041 QIP 045 QIP 049 QIP 051 5_2 a) The qualified individual performs a visual inspection of the complete QIP 040 fusion joint. QIP 041 b) or c)A fusion joint deemed visually unacceptable is not placed into QIP 045 service. QIP 049 QIP 051 QIP 052 5.11 a) Chips (shavings)are removed with a clean, lint free cloth. QIP 040 Butt Fusion b) Pipe high/low alignment is checked. c) If clamp adjustments are made after initial facing, pipe is refaced, chips (shavings)are removed, and pipe high/low alignment is checked. a) Plates are clean. QIP 040 b) Nonstick coating is intact. c) Temperature is between 400 -450°F. a) The fusion joint is held under fusion force in the machine for a QIP 040 minimum of 30 seconds per inch of pipe diameter or until the pipe surface is cool to the touch. b) The fusion joint is not pressure tested, pulled, installed, or handled QIP 040 roughly for a minimum of 30 minutes after cooling. 5.11.8 Is contractor equipment being inspected? QIP 040 •Yes = inspect, No = proceed to next step. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 28 of 32 a A calibrated pyrometer is used to verify heater plate temperature. 5.12.1 Is ambient temperature below-10°F or above 120°F? QIP 041 •Yes = inspect, No = proceed to next step. QIP 049 a) Fitting is not installed. QIP 051 QIP 052 5.12 a Pipe ends are cutsquarely. QIP 041 GFCP b) Stab depth marks are present or reapplied after scraping. QIP 041 Coupling c Pipe is wiped clean with isopropyl alcohol. a) Each end of the fitting is aligned with stab marks on the pipe. QIP 041 b) Fusion joint is secured in clamping device before fusion begins. c) After the fusion cycle is complete, adhere to the manufacturers cooling times before the joint is removed from the clamping device. d) After the fusion cycle is complete, adhere to the manufacturers cooling times before the joint is tapped or pressure tested. Was the power interrupted during the fusion cycle? QIP 041 •Yes = inspect, No = proceed to next step. a) The joint is allowed to cool to ambient temperature before attempting to refuse. b) Verify with pyrometer that fitting and surrounding pipe temperature have equalized with pipe temperature at least 2 feet away from fitting. 5.12 a) Fittings are only fused to Teel Plastics pipe OR gas piping systems QIP 045 Socket listed on the Performance Pipe Qualified Gas Distribution Piping Fusion Systems document. a) Ends are cut squarely, then cleaned inside and out. QIP 045 b) Chamfering is performed, and the rounding clamp is placed at the bottom of the depth gauge. a) Plates are cleaned with a clean, lint free cloth. QIP 045 b) Nonstick coating is intact. c Tem erature is between 490 -510' F. a) Pipe fusion area and fusion tools are shielded from wind, snow, QIP 045 blowing dust, and rain by using a canopy or similar device. b) Pipe and fitting are pulled straight from the heating iron. c) While joining, the fitting is held flush against the rounding clamp for the appropriate cooling time. d) Joint is allowed to cool an addition 5 minutes after cooling time, before stressing joint. 5.12 a) Fusion joint is secured in clamping device before fusion begins. QIP 049 GFCP b) After the fusion cycle is complete, adhere to the manufacturers Saddle Tee stated cooling times before the joint is removed from the clamping device. c) After the fusion cycle is complete, adhere to the manufacturers stated cooling times before the joint is tapped or pressure tested. Was the power interrupted during the fusion cycle? QIP 049 •Yes = inspect, No = proceed to next step. a) The joint is allowed to cool to ambient temperature before attempting to refuse. b) Verify with pyrometer that fitting and surrounding pipe temperature have equalized with pipe temperature at least 2 feet away from fitting. 5.12 a Pipe ends are cutsquarely. QIP 051 b Stab depth marks are present or reapplied after scraping. QIP 051 POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 29 of 32 Innogaz a) Each end of the fitting is aligned with stab marks on the pipe. QIP 051 Coupling b) Fusion joint is secured in clamping device before fusion begins. c) Cooling time indicated on the electrofusion processor has passed before the joint is removed from the clamping device or pressure tested. Was the power interrupted during the fusion cycle? QIP 051 •Yes = inspect, No = proceed to next step. a) Power failure occurs during the first 25% of the fusion time and the joint is allowed to cool undisturbed for 1 hour before attempting to refuse OR power failure occurs after the first 25% of the fusion time and the joint is replaced. b Pop-up indicators have risen OR fitting is replaced. QIP 051 5.12 a) Fusion joint is secured in clamping device before fusion begins. QIP 052 Innogaz b) Cooling time indicated on the electrofusion processor has passed Saddle Tee before the joint is removed from the clamping device, tapped or pressure tested. Was the power interrupted during the fusion cycle? QIP 052 •Yes = inspect, No = proceed to next step. a) Power failure occurs during the first 25% of the fusion time and the joint is allowed to cool undisturbed for 1 hour before attempting to refuse OR power failure occurs after the first 25% of the fusion time and the joint is replaced. b Pop-up indicator has risen OR fitting is replaced. QIP 052 5.12.2 a) A paint scraper is not used unless the working space is confined, QIP 041 requiring a hand tool. QIP 049 b) Sandpaper, utility/emery cloth, rasps, files, or abrasives/grinders are QIP 051 not used. QIP 052 5.12.3 a) An acceptable method is used to confirm removal of a minimum of QIP 041 .007" pipe material. QIP 049 QIP 051 QIP 052 5.13.1 a) Pipe end is cut squarely. QIP 048 Met Fit b No burrs are present. Coupling a Stab depth is marked and measured on the pipe. QIP 048 a) The rings are bottomed out and past the locking grip. QIP 048 b Stab depth mark is visible. 5.16 (Washington) Is an underground structure present in a PE installation area? QIP 002 •Yes = inspect, No = proceed to next step. QIP 005 a) Pipe has a minimum separation of 6"when crossing non-electric QIP 006 utilities OR protective measures are used. b) Pipe has a minimum separation of 12"when paralleling utilities OR protective measures are used. c) Pipe has a minimum separation of 12"when crossing electric OR protective measures are used. 5.16 (States other than Washington) Is an underground structure present in a PE QIP 002 installation area? QIP 005 •Yes = inspect, No = proceed to next step. QIP 006 a) Pipe has a minimum separation of 4"when crossing or paralleling underground non-electric utilities and structures OR protective measures are used. b) Pipe has a minimum separation of 12"when crossing or paralleling electric OR protective measures are used. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 30 of 32 5.16.3 a Service lines are not installed in a bore with electric. QIP 007 5.17 a) Pipe is not installed within 10' of a system radiating temperatures QIP 005 above 1001F. QIP 006 5.22 a) Main is installed with a minimum cover of 54" in cultivated QIP 005 agricultural areas, 30" in soil, OR 24" in consolidated rock. 5.22 a) Ditch bottom provides uniform support with firm material for pipeline. QIP 008 b) Ditch bottom is clean and free of rocks or other hard objects OR 6" of bedding material is laid before the pipe is placed. c) Bedding material is either: Native material clean and free of rocks or other hard objects; sand; or non-fractured gravel not exceeding 1/4" minus in size. 5.22 a) Pipe is shaded with 6" of backfill material. QIP 008 b) Backfill material is either: Native material clean and free of rocks or other hard objects; sand; or non-fractured gravel not exceeding 1/4" minus in size. 5.22 a Final backfill does not contain trash or debris. QIP 008 5.22.9 Is the project in Oregon or upon completion of installation of underground QIP 161 facilities has Field Operations determined it to be necessary to mark facilities? •Yes = inspect, No = proceed to next step. a Facilities are marked per the requirements of OPS 611. 5.23 Is the service line installed in soil? QIP 006 •Yes = inspect, No = proceed to next step. a) Pipe smaller than 2" is installed with a minimum cover of 18"on private property, 24" in the ROW unless a lesser minimum cover is approved. b) Pipe 2" and larger is installed with a minimum cover of 30", except areas near the riser as required due to bury line requirements of anodeless service risers. c) Pipe is installed with a minimum cover of 54" in cultivated agricultural areas unless a lesser minimum cover is approved. 5.23 Is the service line installed in consolidated rock? QIP 006 •Yes = inspect, No = proceed to next step. a) Pipe smaller than 2" is installed with a minimum cover of 12"on private property or 18" in the ROW, unless a lesser minimum cover is approved. b) Pipe 2" and larger is installed with a minimum cover of 24", unless a lesser minimum cover is approved and/or except areas near the riser as required due to bury line requirements of anodeless service risers. c) Pipe is installed with a minimum cover of 54" in cultivated agricultural areas unless a lesser minimum cover is approved. 6 a) Tracer wire is not brazed or soldered. QIP 047 b Tracer wire is installed within approximately 6"of the pipe. POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 31 of 32 ADMINISTRATION The Vice President, Engineering &Operations Services of the MDU Utilities Group is responsible for establishing this policy.Administration of this policy is the responsibility of the Director, Policy& Procedures. Reviewed: rrrEanaurrrvN -_ Approved: Director, Polic`yF�mcedures Vice PresicTei�F Engineering &Operations Services Date: 7-12-24 Date: 7-15-24 REVISIONS Major Revision Summary MOC Date New integrated procedure. Replaced CNG CP 607, IGC OPSMOC-301 1/4/2022 4027, and MDU GDS Sec. 5 2023 Annual Procedure Review: Added QIP requested by QMS. Added NESC recommendations. Align language with OPSMOC-1722 7/22/2024 OPS 306 and 308. Minor Revision Summary MOC Date Revised 5.16 to add minimum separation requirements in OPSMOC-1415 2/11/2022 Washington. Add TR-33 note to section 5.11. N/A 8/23/2022 Language in section 5.4 has been edited to distinguish between pipe larger than two inches (Section 5.4.1) and pipe OPSMOC-1540 10/4/2022 two inches and smaller(Section 5.4.2). Change the discontinuance date for socket fusion and sidewall heat fusion tapping tees in the areas they are OPSMOC-1707 11/23/2022 currently being used. 5.6. Plastic joining manuals, procedures, and specification are available in the Guides & Resources section of the MDUG Policy& Procedure SharePoint site. Contractors can OPSMOC-1820 2/15/2023 access manuals on the manufacturer's website. 5.6.1. George Fischer Central Plastics Electrofusion Installation and Training Manual. 5.6.2. Inno az Electrofusion System POLICY STATEMENT OPS 307 Cascade Natural Gas Corporation Polyethylene(PE) Main and Service Status: Released Great Plains Natural Gas Co. Construction Revision Date:Sept.16,2024 Intermountain Gas Company OPSMOC-2266 Montana-Dakota Utilities Co. Page 32 of 32 Installation Procedure. ***5.6.1. and 5.6.2. are linking to the manufacturer's website. Change the sunset date of the use of socket fusion, and OPSMOC-2059 1/4/2024 Constab mechanical fittings in section 5.3.2 & 5.23.3. Implement Maximo/Locusview to document SSIP projects. OPSMOC-1814 5/13/2024 Removal of reference to use of saddle fusion fittings in OPSMOC-2113 5/31/2024 section 5.3.2. Revised section 5.3. Clarification on Met-Fit and Continental OPSMOC-2266 9/16/2024 Stab Fittings.