MOHAVE GENERATING STATION
Decommissioning, Demolition and Asbestos Abatement
NorthStar was contracted by Southern California Edison to decommission the Mohave Generating Station (MOGS) in Laughlin, Nevada. MOGS was a 1,580 megawatt coal-fired electric power generation facility situated on 3,000 acres adjacent to the Colorado River. The Facility contained 217 acres of storage ponds, evaporation ponds, and a 300-acre landfill.
The scope of services included: asset recovery, asbestos abatement, hazardous material handling and disposal, demolition, relocation of the pond contents to the onsite landfill, and closure of the landfill. Asbestos abatement included the removal of friable and non-friable materials, closure of the boiler, tank and pipe insulation, floor tile and mastic, roofing transite and other materials. Hazardous material handling included the collection and disposal machine oil, hydraulic fluids, PCB oil, mercury switches, light tubes, ballasts, batteries and other classified wastes. Pond closure included the relocation of 2.5 MM CY of material to the on-site landfill and grading of the pond berms to the match surrounding grade. Landfill closure included constructing a buttress, grading the area to meet the required slopes, installing back drains, surface drainage swales and placing a two-foot drip cap over the entire landfill. The landfill closure also required the redesign of the final documents to reflect an early closure.
Highlights of the demolition and decommissioning activities on the site included the demolition of two180-foot high supercritical steam boilers, two 790 MW cross-compound steam turbines, four 8-million gallon steel storage tanks, and one 500-foot tall concrete stack. In addition, demolition activities were performed around the Control Room which remained active during the first few months of the project. The work involved daily coordination with the client and the site-services contractor to ensure seamless continuity of items that needed to be maintained until they could be terminated. Explosive demolition methods were employed for the boiler structures and the concrete stack. As part of the demolition activities, NorthStar salvaged and recycled over 40,000 tons of ferrous metals as well as recovered and recycled other exotic metals diverting them from landfills.
Asset recovery included completing an inventory of the site assets, marketing those assets online and conducting onsite auctions. This project was structured as a “net credit payment” to the owner for a predetermined amount with a sharing option if the minimum revenue amount was exceeded. NorthStar successfully marketed and sold several large components therefore providing the client with a large profit sharing.
Finally, NorthStar coordinated with local city and county officials providing the necessary information and expertise to perform this complex project without injury. Upon completion of all work activities, NorthStar had performed over 300,000 man-hours without a lost time incident.The overall project was completed to the client’s satisfaction and agreed upon schedule.