Kennecott_Mill_North_Slope_Scaffold_and_Deck_Stabilization_Pads_Report.pdf
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- Attached to
- Repair Historic Kennecott Mine Structures Federal contract opportunity
- Solicitation number
- 140P2019R0021
About this file
This document contains a federal contract opportunity notice and related project report. The National Park Service is soliciting proposals for construction services to stabilize and repair the historic Kennecott Mines National Historic Landmark Mill Building in Wrangell-St. Elias National Park and Preserve in Copper Center, Alaska. The project scope involves selective replacement of deteriorated heavy timber structures, leveling of remnant ore, reinstallation of siding following stud replacement, construction of a new heavy timber frame and roof, and partial demolition and reconstruction of a timber feature. The government will award a single firm-fixed price contract under a competitive small business set-aside to provide these services over a 730 calendar day performance period. A pre-proposal site visit is scheduled for September 10, 2019, with proposals due around August 22, 2019. The estimated contract value is between $1-5 million.
Kennecott Mill North Slope Scaffold and Deck Stabilization Pads Report
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Text version
Kennecott Mill North Slope Scaffold and Deck Stabilization Pads Report: 10/03/2019
Between Sept. 30 and Oct. 3, 2019 Kennecott Maintenance staff including Matt Smith, Marie Thorn and Paul Hanis along with Alaska Regional Blasting Officer Tim George successfully completed the installation of 14 pads (4”x12”x24”nom.) to be used in the Spring of 2020 for stabilization of the Level 7D north deck (by NPS day labor) and the erection of a scaffolding tower (by contractor, utilizing NPS scaffolding) on the slope between levels 5-7D.
This work involved comprehensive planning and risk management analysis due to the presence of potential explosives, heavy metals and other physical hazards associated with the Concentration Mill.
The slope was measured at 43°, and was steeper in some locations. The surface of the slope is comprised of a matrix or woody debris, rusty metal artifacts, burned fuse, potential blasting caps, miscellaneous other waste deposited from the mill processing as well as ore dust (containing mercury, lead, arsenic, copper, etc.), as well as some oil-stained soil/ore dust.
Gravity-fed water was used to minimize the presence of dust while disturbance was taking place and half-face respirators with mercury/particulate filters were used as well as all other required PPE. A temporary decontamination facility was established at the top of Mill for initial cleanup of tools and personnel.
A winch was used to relocate the heaviest items in an attempt to keep workers safe distance from potential explosions while dragging the heaviest artifacts out of the way. Light materials were moved by hand. All materials were moved only as far as necessary to install the pads.
The pictures will probably give a better idea of what we accomplished.
Before and after.
Before and after.
Slope before we moved all the debris.
Looking down from above, plan view.
Heavy lifting done, stabilization will occcur early Spring.
D
Marie Paul and Matty, steep slope.
Decontamination tent with gravity-fed fire hose for dust suppression.
File details come from the government source that posted it. Updated .