/s/ Michael T. Loeffler. Michael T. Loeffler Senior Director, Certificates and External Affairs. Attachment. May 24, 2018.

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1 Northern Natural Gas Company P.O. Box 3330 Omaha, NE May 24, 2018 Via efiling Ms. Kimberly D. Bose, Secretary Federal Energy Regulatory Commission 888 First Street, N.E. Washington, D.C RE: Northern Natural Gas Company Cedar Station Upgrade Docket No. CP Weekly Report #18 Dear Ms. Bose; Pursuant to Condition 8 of the Order Issuing Certificate issued by the Federal Energy Regulatory Commission August 22, 2017, in the above-referenced docket, Northern Natural Gas Company hereby submits for filing its weekly status report for the period ending May 20, Any questions regarding the filing should be directed to the undersigned at (402) Respectfully Submitted, /s/ Michael T. Loeffler Michael T. Loeffler Senior Director, Certificates and External Affairs Attachment

2 Northern Natural Gas Cedar Station Upgrade Project (CP ) Weekly Status Report No. 18 Reporting Period: May 14 to May 20, 2018 PROJECT DESCRIPTION The project consists of a 7.86-mile-long, 20-inch-diameter pipeline in Dakota County, Minnesota. New valve settings with inline inspection facilities will be installed at each end of the pipeline. FEDERAL AUTHORIZATION STATUS Northern Natural Gas (Northern) began consultation with the applicable agencies and tribes in September The status of all federal authorizations are listed in the table below. Permit/Approval Administering Agency Status Federal Certificate of Public Convenience and Necessity Endangered Species Act Section 7 Consultation Rivers and Harbors Act, Section 10; Clean Water Act, Sections 404 (dredge/fill) and 401 (water quality certification) Section 106 National Historic Preservation Act Consultation State State Listed Threatened & Endangered Species Consultation License to Cross Public Waters Wetlands Federal Regulatory Commission (FERC) U.S. Fish and Wildlife Service U.S. Army Corps of Engineers, St. Paul District and Minnesota Pollution Control Agency Minnesota State Historic Preservation Office Minnesota Department of Natural Resources Minnesota Department of Natural Resources Certificate issued August 22, 2017 Original No Effect determination received 6/2/2016; subsequent to the No Effect determination, the rustypatch bumble bee was added to the list of endangered species. On 4/27/2017, a May Affect But Not Likely to Adversely Affect Determination was issued. Permit received 4/24/2017 No Effect concurrence received 4/13/17 Concurrence received 6/22/2016 Completed 7/22/2016 1

3 Permit/Approval Administering Agency Status Water Appropriation General Permit (hydrostatic test water and trench dewatering) NPDES 1 Permit for Storm Water Discharge from Construction Activities Minnesota Department of Natural Resources Minnesota Pollution Control Agency 1 NPDES = National Pollutant Discharge Elimination System Permits for first 1.5 miles for open cut received 3/20/2017; remaining permits received 4/13/2017 Permit received 3/21/2017 PIPELINE One contractor will construct the branch line facilities. The environmental training totals listed below reflect all training conducted on the pipeline. On-site Contractor: Minnesota Limited, LLC. (Minnesota Limited) Overall Construction Start Date: January 30, 2018 Environmental Training Conducted: This reporting period: 05 Total to date: 153 Construction Status Minnesota Limited continued topsoil segregation; story pole 1, erosion control device (ECD), and goal post 2 installations; and sound barrier installation for horizontal directional drills (HDD) at mile post (MP) 3.1 (Plan and Profile No. P4-6) and MP 7.4 (Plan and Profile No. P4-21). Sandblasting and coating continued for the 20-inchdiameter pipe for the HDD. The contractor continued stringing and welding the 20-inchdiameter pipe for the HDD from MP 5.3 to MP 5.7. Topsoil segregation is complete from MP 0.1 to MP 2.0, MP 3.0 to 3.5, MP 5.3 to MP 6.3 and from MP 7.0 to MP 7.6. Work in the Rosemount Junction station included excavation of 180 feet of ditch, installation of a 20-inch-diameter pipe and completion of backfill. Wetland feature W-07 at MP 1.3 was approved by the U.S. Army Corps of Engineers (USACE) and City of Rosemount for an additional 0.04 acre to be graded to prevent an unsafe side-slope condition for trucks on the timber mats. The wetland was graded and soils were properly segregated, and protected with ECDs; timber mats will be installed along the working side of the ROW. Construction Modifications Other than the additional acres graded at wetland feature W-07 described above, no construction modifications occurred during this reporting period. Stream Crossings and Environmentally Sensitive Areas - Wetland feature W-33 (Plan and Profile No. P3-4) was crossed by HDD 1 The contractor hydro-excavates a pothole to locate the existing pipeline and then installs a PVC pipe (story pole) in the ground recording depth, mile post and other relevant information on the pipe. This is part of the damage prevention procedure. 2 The contractor installs two PVC pipes vertically on either side of access roads with pennant flagging between the PVC pipes to warn contractors of the overhead risk of electrical power lines 2

4 - Wetland feature W-20 (Plan and Profile No. P4-4) is currently being crossed by HDD Rain Events No rain events in excess of 0.5 inch occurred this reporting period. The environmental inspection concluded that the jobsite was in full environmental compliance. To date, the project has received 3.20 inches of precipitation. Branch Line Construction Progress Activity Start Date Completed Notes Survey 01/10/ /25/2018 Completed Clearing 01/30/ /28/2018 Completed Grading 04/10/ % Stringing 04/25/ % Welding 04/28/ % Ditching HDD P4-1 05/18/ % Drilling HDD P4-2 HDD P4-3 05/15/ % Drilling HDD P4-4 05/18/ % Drilling HDD P4-5 HDD P4-6 HDD P4-7 HDD P4-8 HDD P4-9 05/15/ % 30-inch ream HDD P4-10 HDD P4-11 HDD P4-12 HDD P4-13 HDD P4-14 HDD P4-15 HDD P4-16 HDD P4-17 HDD P4-18 HDD P4-19 HDD P4-20 HDD P4-21 Lower-in Backfill Tie-ins Clean-up Seeding *Completed totals include either percentage completed or date all completed. All totals are approximate. Spills Project-derived waste will be properly managed and every effort will be made to eliminate spills. Minnesota Limited will conduct final disposal of contaminated soil and material through Clean Harbors. Project spills, regardless of volume, will be documented in this section and tracked in the table below. No spills occurred this reporting period Spill No. Date Segment Volume Notes 1 04/27/2018 MP 0.1 access road 2.0 gallons Cleaned and contained in contamination barrels *The Minnesota Department of Natural Resources (MNDNR) will be notified of all spills that result in a hazardous condition as defined by the DNR. The National Response Center (NRC) will be notified as applicable. 3

5 One-Week Projection - Continue topsoil segregation - Continue installation of ECDs - Continue stringing 20-inch-diameter pipeline - Continue work in the Rosemount Junction facility - Continue installation of goal posts at all highline crossings - Continue welding 20-inch-diameter HDD pipe and line pipe - Continue installation of HDD sound barriers - Continue sandblasting and coating of 20-inch-diameter pipe - Continue HDDs at MP 1.0 (P4-1), MP 1.5 (P4-3), MP 2.0 (P4-5), and MP 5.7 (P4-15) - Commence hydrostatic pressure testing of HDD pipe (pre-test) - Commence work in Cedar Station AGENCY COMMUNICATIONS On May 7, 2018, the Saint Paul District of the USACE approved modification of 0.04 acre of impacts from fill (matting) to cut/fill (matting) with restoration of original soils, contours, and vegetation resulting in a permanent no-net-loss of wetland acres for Wetland 7 to prevent an unsafe side-slope condition for trucks on the timber mats. On May 16, 2018, the City of Rosemount issued a Notice of Decision that the proposed modifications to Wetland 7 would result in no-loss of wetlands within their jurisdiction. PROJECT-WIDE LANDOWNER CONCERNS There were no landowner concerns during this reporting period. Tract: Location: Problem/Concern: Resolution: Date: NON-COMPLIANCE CONCERNS There were no compliance concerns during this reporting period. 4

6 Photos of this week s activities: Facing west, near MP 5.7, drilling and stringing is ongoing Facing south, near MP 1.4, toposoil segregation is ongoing 5

7 Facing south, near MP 5.5, silt fence installation is ongoing 6