June 6, Via efiling. Ms. Kimberly D. Bose, Secretary Federal Energy Regulatory Commission 888 First Street, N.E. Washington, D.C.

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1 Northern Natural Gas Company P.O. Box 3330 Omaha, NE June 6, 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 Lake Mills Compressor Station Docket No. CP Weekly Status Report No. 11 Dear Ms. Bose: Pursuant to Section (c)(10) of the Commission s regulations, Northern Natural Gas Company hereby submits in the above-referenced docket its weekly environmental inspector report for the period ending June 3, 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

2 Northern Natural Gas Company Lake Mills Compressor Station Project Docket No. (CP ) Weekly Status Report No. 11 May 28, 2018 June 3, 2018 PROJECT DESCRIPTION Northern Natural Gas (Northern) is constructing and will be operating a new compressor station consisting of one 15,900-horsepower natural gas-fired turbine-compressor package in Worth County, Iowa. The facilities are required to provide the requested incremental firm transportation requirements on Northern s system north of Ventura, Iowa. Northern s customer will use the gas to serve customers in Rochester, Minnesota, and in surrounding areas. Appurtenant facilities also would be installed. About 60 feet of pipeline would be removed to facilitate tie-ins; a recycle line and suction and discharge piping also would be installed. Northern is constructing the Project in accordance with the FERC s requirements for prior notice blanket authorization (18 CFR (b)) and Northern s blanket authorization granted September 1, 1982, at Docket No. CP FEDERAL AUTHORIZATION STATUS Northern began consultation with the applicable agencies and tribes September To date, all federal authorizations have been received and are listed in the table below. Administering Agency Permit or Approval Status Federal Federal Energy Regulatory Prior Notice Self-authorized May 24, Commission U.S. Army Corps of Engineers (USACE), Rock Island District U.S. Fish and Wildlife Service (FWS), Region 3, Twin Cities Ecological Service Field Office Native American Tribes State Iowa Department of Natural Resources Section 404, Clean Water Act (CWA) Dredge and Fill Section 10 Rivers and Harbors Act Section 7 Endangered Species Act, Bald and Golden Eagle Protection Act, Migratory Bird Treaty Act, and Easement crossings consultations National Historic Preservation Act (NHPA), Section 106 Consultation to determine impacts on Traditional Cultural Properties Clean Air Act, Prevention of Significant Deterioration (PSD) Minor/Title V Major Air Construction Permit State Protected Species Consultations Section 401 Water Quality Certificate National Pollutant Discharge Elimination System (NPDES) Stormwater Permit Request for Approved Jurisdictional Determination submitted November 17, Preliminary JD received December 14, No Preconstruction notification required. Informal consultation initiated October 20, No response received. Consultation complete. Informal consultation with Native American Tribes initiated November 11, Follow up conducted December Consultation complete. Permits received July 17, Revised construction permits 17-A-238- S1 and 17-A-239-S1 received April 11, Informal review of listed species in October 20, Provided response to request for additional information October 25, Response received October 28, Consultation complete. No USACE Preconstruction Notification, therefore no Section 401 application required. The project falls under 40 CFR (c)(1)(iii) and no authorization under the CWA section 402 is required. 2

3 Administering Agency Permit or Approval Status A SWPPP has been developed for the Project. Iowa State Historic Preservation Office Water Appropriations Permit Section 106 Consultation, NHPA Received October 2, 2017, modified April 24, 2018 Literature review and Phase I Cultural Resource Report submitted for review and concurrence January 26, 2016; concurrence received March 2, Environmental Training One contractor is constructing the Lake Mills compressor station. The environmental training totals listed below reflect all training conducted for the compressor station. On-site Contractor: K & K Incorporated (K & K) Overall Construction Start Date: April 3, 2017 Environmental Training Conducted: This reporting period: 4 Total to date: 18 Construction Status K & K continued hauling in and spreading rock for the compressor station site. K & K continued installation and maintenance of silt fence and erosion control devices (ECDs) along the workspace perimeter. K & K continued receiving and staging piping and building equipment within the extra temporary workspace (ETWS). Station Civil: K & K completed installation of rebar and concrete forms for the compressor building stem walls. K & K completed excavation and installation of rebar and concrete forms for the scrubber foundation. K & K poured concrete for the compressor building stem walls and pipe supports. Concrete trucks and the pump truck were washed out in the designated concrete washout area. Plastic sheeting was placed underneath the pump truck to prevent any leaks or spills. Braun Intertec was onsite to test concrete for compliance with the required specifications. K & K began setting batter boards and layout for the generator foundation. K & K completed backfilling and installation of the rebar mat for the auxiliary building foundation. Station Mechanical: K & K's welders continued pipe fabrication in the ETWS. Station Electrical: Apple Electrical Contractors, Inc. (Apple Electrical) continued mobilizing tools, equipment, and personnel. Apple Electrical installed underground conduit runs in the auxiliary building for the automatic transfer switch (ATS), generator, main disconnect, motor control center (MCC) and the T-1-T-4 transformers. Construction Modifications No construction modifications occurred this reporting period. Stream Crossings and Environmentally Sensitive Areas No wetland or environmentally sensitive areas are present in the construction area. Rain Events One rain event of 0.60 inch occurred May 31, The inspection per the erosion control plan 3

4 found the project to be in full environmental compliance. To date, the project has received 9.88 inches of precipitation. Lake Mills Compressor Station Construction Progress Activity Start Date Completed Notes Site Preparation 4/5/18 45% Continued site preparation activities within the ETWS Station - Civil 4/23/18 30% Poured concrete for the auxiliary building stem walls Station - Mechanical 5/12/18 2% Continued pipe fabrication within the ETWS Station - Electrical 5/25/18 1% Began installing underground conduit Station - Commissioning Clean-Up and Restoration *Completed totals include either percentage completed or date all completed. All totals are approximate. Percentage completed references the location at time table was completed within this reporting period. Weekly Projection 1. Continue equipment, tools, and personnel mobilization 2. Continue to prepare the ETWS and continue ECD maintenance 3. Continue to haul in and spread rock for the compressor station foundation 4. Continue to excavate the building foundations 5. Continue to build and set concrete forms for building foundations 6. Continue concrete pours for building foundations 7. Commence excavation for the generator foundation 8. Continue receiving and staging building and piping materials 9. Continue piping fabrication 10. Commence installing structural steel for the auxiliary building 11. Apple Electrical will continue to mobilize equipment, tools and personnel 12. Apple Electrical will commence conduit installation for the main disconnect and utility transformer PROJECT-RELATED SPILL TOTALS All project-derived waste will be properly managed and every effort will be made to eliminate spills. Safety-Kleen will dispose of all project-derived waste. There were no spills during this reporting period. This reporting period: 0 Total to date: 2 Quantity: 0.00 gallons Total quantity: 3.94 gallons Spills To Date Spill No. Date Segment Volume Notes 1 4/5/18 Lake Mills 3.87 gallons O-Ring failure in the hydraulic filter on a bulldozer Compressor Station 2 4/27/18 Lake Mills Compressor Station 0.07 gallon Hydraulic hose failure in an extended boom forklift The Iowa Department of Natural Resources will be notified of all spills that meet the reportable threshold. The National Response Center (NRC) will be notified as applicable. 4

5 PROJECT-WIDE AGENCY COMMUNICATIONS AND SITE VISITS No agency communications occurred during this reporting period. PROJECT-WIDE LANDOWNER CONCERNS There were no landowner concerns during this reporting period. PROJECT-WIDE NON-COMPLIANCE CONCERNS No compliance concerns occurred during this reporting period. Photos Facing southeast, continued backfill for the auxiliary building foundation 5

6 Facing west, the pump truck was placed on plastic sheeting to prevent any leaks or spills Facing east, poured concrete for the compressor building stem walls and pipe supports 6

7 Facing southeast, installed rebar and concrete forms for the scrubber foundation Facing east, silt fence is functional and in good condition around workspace perimeter 7