Demolition of the Navajo Generating Station.pdf

Sunshine Pryor, Tetra Tech EC, Inc.
Pete Everds, Tetra Tech EC, Inc.
Michael O'Hare, Tetra Tech EC, Inc.

Description

Demolition of the Navajo Generating Station Authors Ms. Sunshine Pryor - United States - Tetra Tech EC, Inc. Mr. Pete Everds - United States - Tetra Tech EC, Inc. Mr. Michael O'Hare - United States - Tetra Tech EC, Inc. Abstract Operation of the Navajo Generating Station (NGS), a 2,250 MW coal-fired power plant, in Northern Arizona ceased in 2019 with demolition starting soon after and restoration will be completed in early 2024. Decommissioning, decontamination, demolition and restoration (DDDR) activities included closure of the CCR landfill, closure of evaporation ponds and solid waste landfill, removal and disposal of the overhead catenary lines, demolition and removal of 3 – 750 MW power units and all associated equipment and support facilities. The plant was isolated from energy sources, remaining chemicals/fuels/fluids were removed, and asbestos-containing materials abated prior to demolition. Experts mechanically demolished structures using shears and equipment and explosives were used to bring down the three 775-foot stacks, boilers, and turbine deck. Site restoration included removal of ponds wastes, grading for proper stormwater drainage and retention, and revegetation. Closure of the approximately 277-acre CCR landfill included consolidation of ash, evaporation pond waste, and inert construction debris. The waste surface was prepared for the cover system (a combination of geotextile, geomembrane, and geocomposite). Cover soil was placed over the liner and stormwater drainage and retention features were installed. Access roads were constructed for inspection, monitoring, and maintenance activities. Revegetation was with a native seed mix.

 
May 15th, 11:30 AM May 15th, 12:00 PM

Demolition of the Navajo Generating Station.pdf

Grand Rapids, Michigan

Demolition of the Navajo Generating Station Authors Ms. Sunshine Pryor - United States - Tetra Tech EC, Inc. Mr. Pete Everds - United States - Tetra Tech EC, Inc. Mr. Michael O'Hare - United States - Tetra Tech EC, Inc. Abstract Operation of the Navajo Generating Station (NGS), a 2,250 MW coal-fired power plant, in Northern Arizona ceased in 2019 with demolition starting soon after and restoration will be completed in early 2024. Decommissioning, decontamination, demolition and restoration (DDDR) activities included closure of the CCR landfill, closure of evaporation ponds and solid waste landfill, removal and disposal of the overhead catenary lines, demolition and removal of 3 – 750 MW power units and all associated equipment and support facilities. The plant was isolated from energy sources, remaining chemicals/fuels/fluids were removed, and asbestos-containing materials abated prior to demolition. Experts mechanically demolished structures using shears and equipment and explosives were used to bring down the three 775-foot stacks, boilers, and turbine deck. Site restoration included removal of ponds wastes, grading for proper stormwater drainage and retention, and revegetation. Closure of the approximately 277-acre CCR landfill included consolidation of ash, evaporation pond waste, and inert construction debris. The waste surface was prepared for the cover system (a combination of geotextile, geomembrane, and geocomposite). Cover soil was placed over the liner and stormwater drainage and retention features were installed. Access roads were constructed for inspection, monitoring, and maintenance activities. Revegetation was with a native seed mix.