Construction Sand and Gravel Mining, New Single-Family Housing Construction (except Operative Builders), Residential Remodelers, Water and Sewer Line and Related Structures Construction, Site Preparation Contractors

NORTHSTAR MATERIALS, INC. DBA KNIFE RIVER MATERIALS

Support Activities for Oil and Gas Operations, Support Activities for Nonmetallic Minerals (except Fuels) Mining, Fossil Fuel Electric Power Generation, Other Chemical and Allied Products Merchant Wholesalers, Petroleum and Petroleum Products Merchant Wholesalers (except Bulk Stations and Terminals)

KRAEMER MINING AND MATERIALS, INC.

GOVERNMENT MARKETS

Crushed and Broken Limestone Mining and Quarrying, Other Crushed and Broken Stone Mining and Quarrying, Construction Sand and Gravel Mining, Industrial Sand Mining, Water Supply and Irrigation Systems

Construction Sand and Gravel Mining

Construction Sand and Gravel Mining, Industrial Building Construction, Commercial and Institutional Building Construction, Water and Sewer Line and Related Structures Construction, Oil and Gas Pipeline and Related Structures Construction

Construction Sand and Gravel Mining

Construction Sand and Gravel Mining, Site Preparation Contractors

Crushed and Broken Granite Mining and Quarrying

Crushed and Broken Granite Mining and Quarrying, Construction Sand and Gravel Mining, Other Heavy and Civil Engineering Construction

Construction Sand and Gravel Mining, Water and Sewer Line and Related Structures Construction

Support Activities for Oil and Gas Operations, Site Preparation Contractors, All Other Specialty Trade Contractors, Construction Machinery Manufacturing

All Other Nonmetallic Mineral Mining, Power and Communication Line and Related Structures Construction, Other Heavy and Civil Engineering Construction, Poured Concrete Foundation and Structure Contractors, Masonry Contractors

Crude Petroleum and Natural Gas Extraction, Natural Gas Liquid Extraction, Bituminous Coal and Lignite Surface Mining, Bituminous Coal Underground Mining, Anthracite Mining

Support Activities for Forestry, Construction Sand and Gravel Mining