August 31, 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 August 31, 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. 23 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 August 26, 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. 23 August 20, 2018 August 26, 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 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: 10 Total to date: 80 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 sandblasted and commenced painting the station scrubber. K & K continued sandblasting and painting the above ground piping in the east workspace and the 4-inch-diameter blow down line to the silencer. K & K continued coating the E-Line tie-ins and valves. Plastic sheeting was used to capture sandblast media and coating for proper disposal. K & K installed 2-inch-diameter vent lines on the compressor building. K & K poured concrete for the E-line thrust blocks, electrical box foundations, and the lube oil support foundation. Concrete trucks were washed out in the designated concrete washout area. K & K continued installing insulation around the light pole foundations. K & K commenced excavation for the suction headers, discharge headers, and the discharge piping north of the station scrubber. K & K commenced excavation and installation of the 2-inch-diameter power gas lines from the D-Line 2-inch-diameter valves. K & K removed concrete forms from the lube oil cooler foundation, two E-Line thrust blocks, electrical box foundations, and the light pole foundations. Young Plumbing & Heating installed registers, grills, and thermostats for the heating, ventilation, and air conditioning applications. K & K installed the exhaust and intake transition duct inside the compressor building. K & K continued backfilling around the D-Line and E-Line tie-ins. Station Mechanical: K & K's welders completed the third hydrostatic pressure test of the main line piping. K & K dewatered the hydrostatic pressure tested pipe back into the onsite frac tank. K & K built containment structures and placed them underneath all valves, plugs, pumps, and hose connections for the hydrostatic pressure test. K & K continued 1-inch-, 2-inch-, 3-inch- and 16-inchdiameter piping fabrication. K & K commenced bolting up the suction and discharge piping to the compressor. K & K installed gas operated valve (GOV) 105 & GOV 106 in the valve yard. K & K installed the 36-inch-diameter station scrubber outlet piping. Station Electrical: Apple Electrical Contractors, Inc. (Apple Electrical) secured and landed cables in the fire and gas interface panel inside the compressor building. Apple Electrical continued to land 3

4 previously installed cables on the Solar skid to the lube injection pump motor, heaters, and the fuel injection pump motor. Apple Electrical continued to install receptacles with industrial covers in the auxiliary building. Apple Electrical installed fire and gas devices and terminated four fire eyes in the compressor building. Apple Electrical installed fiber control and communication cables in the communication cabinet from the tech room, station control panel, T-1 communication board, and fire and gas interface cabinet in the motor control center. Apple Electrical continued to install PVC coated rigid galvanized steel conduit to the fuel gas skid from the turbine. Apple Electrical continued to terminate communication cables with end kits and landed in the communication cabinet. Apple Electrical installed rigid galvanized steel conduit and cable for the horn and beacons in the compressor building. 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 in excess of 0.50 inch occurred during this reporting period. On August 21, 2018, the project received 1.50 inches of rain. The inspection, per the erosion control plan, found the project to be in full environmental compliance. 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 78% Continued site preparation activities within the ETWS Station - Civil 4/23/18 70% Station - Mechanical 5/12/18 51% Continued piping fabrication Poured concrete for the E-Line thrust blocks, electrical box foundations, and the lube oil support foundation Station - Electrical 5/25/18 52% Installed fire and gas devices and terminated four fire eyes in the compressor building 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 ECD maintenance 3. Continue to backfill and compact around building foundations 4. Continue receiving and staging building materials 5. Continue piping fabrication 6. Continue auxiliary building erection 7. Continue compressor building erection 8. Continue hydrostatic pressure testing of new piping 9. Continue to sandblast and coat various diameter piping 10. Apple Electrical will install and terminate the fuel gas skid application, generator set, 4

5 grounding, and closed-circuit television applications 11. Fill Solar reservoir with lubricating oil for turbine 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 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. 5

6 Photos Facing east, K & K built containment for valves, plugs, and pipe connections for the hydrostatic pressure test Facing northeast, K & K removed concrete forms from the pipe support foundations 6

7 Facing north, K & K poured concrete for the electrical box foundations Facing west, K & K installed insulation around the light pole foundations 7

8 Facing northeast, K & K commenced bolting the suction and discharge piping to the compressor Facing west, K & K continued coating the E-line tie-ins and valves 8