October 25, 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 October 25, 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. 31 Dear Ms. Bose: Pursuant to Section (c)(10) of the Commission s regulations, Northern Natural Gas Company hereby submits for filing in the above-referenced docket its weekly environmental inspector report for the period ending October 21, 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. 31 October 15, 2018 October 21, 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 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 (JD) 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 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 is required. The project falls under 40 CFR (c)(1)(iii) and no authorization under the CWA section 402 is required. A SWPPP has been developed for the Project. 2

3 Administering Agency Permit or Approval Status Water Appropriations Permit Received October 2, 2017, modified April 24, 2018 Iowa State Historic Preservation Office Section 106 Consultation, NHPA Literature reviewed 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, 2018 Environmental Training Conducted: This reporting period: 4 Total to date: 101 Construction Status K & K continued maintenance of silt fence and erosion control devices (ECDs) along the workspace perimeter. K & K continued receiving and staging building equipment within the extra temporary workspace (ETWS). Station Civil: K & K continued cleaning the inside of the auxiliary and compressor buildings. K & K continued to sub-grade the south workspace area in preparation to install rock. K & K continued hauling in sand for backfill and clean rock for the compressor station yard. K & K continued spreading rock and compacting with a roller in the southwest workspace. K & K continued hauling out topsoil and subsoil to an approved location. K & K continued to backfill around the fuel gas heater, the fuel gas heater piping and the suction and discharge header piping. K & K commenced excavation and installation of bollards around multiple electrical racks, the generator, the satellite, and the air header riser. K & K continued sandblasting and painting the station scrubber, the station scrubber piping and above ground piping. Plastic sheeting was used to capture sandblast media and paint overspray for proper disposal. K & K applied wax tape around the suction and discharge header flanges. River City Fence Co. mobilized equipment and materials to install the compressor station fence. River City Fence commenced installation of fence posts for the north perimeter of the fence. Station Mechanical: K & K's welders continued installation of the grating in the compressor building. K & K insulated the fuel gas heater piping. Northern purged and loaded the station for emergency shutdown testing. Northern completed the 24-hour test run on the compressor unit with no issues. Station Electrical: Apple Electrical Contractors, Inc. (Apple Electrical) continued stainless steel tubing installation on the fuel gas regulator valves and the fuel gas relief valve. Apple Electrical continued stainless steel tubing installation on the fuel gas and power gas take offs, pressure indicators, pressure transmitters, and pressure differential switches. Apple Electrical pulled cables for the building heater meter. Apple Electrical continued terminating cables in the control room. Apple Electrical installed television monitors in the control room. 3

4 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 No rain events in excess of 0.50 inch occurred during this reporting period. To date, the project has received inches of precipitation. Lake Mills Compressor Station Construction Progress Activity Start Date Completed Notes Site Preparation 4/5/18 95% Continued site preparation activities within the ETWS Station - Civil 4/23/18 95% Station - Mechanical 5/12/18 95% Continued spreading and compacting rock for the compressor station yard Continued installation of the grating inside the compressor building Station - Electrical 5/25/18 90% Continued stainless steel tubing installation Station - Commissioning 8/10/18 50% Continued commissioning small devices and equipment Clean-Up and Restoration 9/25/18 30% Continued removing topsoil and subsoil *Completed totals include either percentage of task completed or date task was 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 ECD maintenance 3. Continue to backfill and compact around building foundations 4. Continue auxiliary building erection 5. Continue compressor building erection 6. Continue pneumatic pressure testing of new piping 7. Continue to sandblast and coat various diameter piping 8. Commence restoration activities in the east and west workspace 9. Continue commissioning the generator 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 4

5 Spills To Date Spill No. Date Segment Volume Notes 1 4/5/18 Lake Mills Compressor Station 3.87 gallons O-Ring failure in the hydraulic filter on a bulldozer 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. 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 north, plastic sheeting used to capture sandblast media and paint overspray 5

6 Facing west, K & K continued backfilling around the fuel gas heater and piping Facing south, plastic sheeting used to capture sandblast media and paint overspray 6

7 Facing north, K & K continued backfilling around the discharge piping Facing south, K & K continued subsoil grade work in the west workspace 7

8 Facing east, River City Fence Co. commenced fence post installation 8