2016-01-18_REPORT - M1977493

• Permit No: M1977493
• IBM Index Class Name: REPORT
• Doc Date: 1/18/2016
• Doc Name: Asbestos Disposal Shaft Closure Report
• From: Climax Molybdenum
• To: DRMS
• Email Name: ECS
• Media Type: D
• Archive: No

TETRA TECH TECHNICAL
MEMORANDUM
To: Brian McGill
Company: Climax Molybdenum Company—Climax Mine
CC:
From: Daryl Longwell, P.E.
Date: January 15, 2016
Subject: Climax Mine, CAVR Asbestos Disposal Shaft—Closure Documentation
Project No. 114-910345
The purpose of this report is to summarize the work performed to complete the closure of the Crusher Adit
Vent Raise (CAVR) Shaft at the Climax Mine, and to provide certification of completion. The CAVR Shaft
is a former ventilation shaft that was converted for use as an asbestos disposal shaft, pursuant to approval
from the Colorado Department of Public Health &Environment(CDPHE), Hazardous Materials and Waste
Management Division. Closure activities have been performed in general accordance with the approved
November 16, 2012 closure plan titled "Climax Mine Crusher Adit Vent Raise Asbestos Disposal Shaft
Closure Plan."
In summary, the closure activities included the execution of the following steps:
1. Decontamination and Deconstruction of the Enclosure Building
• Prior to the physical closure of the shaft,the enclosure building will be decontaminated
by a licensed abatement contractor in accordance with the asbestos decontamination
work plan for the CAVR shaft dated November 14, 2012.
2. Construction and placement of formwork and steel reinforcement(rebar); and
3. Construction of reinforced concrete cap to seal the shaft and have the ability to support loading of up
to 100 feet of overburden material; and
4. Placement of a brass monument, embedded in the concrete, identifying the site as an asbestos
disposal site.
The following sections describe the work performed, referencing various documentation included as
attachments to this report. Also included, as Attachment 1, is a Photo Log, providing photographic
documentation of work progress.
1.0. DECONTAMINATION AND DECONSTRUCTION
In general accordance with the Asbestos Decontamination Work Plan, attached to the above-referenced
Closure Plan, the interior of the building was decontaminated, and the HEPA fan exhaust system and bag
disposal conveyance system (disposal chute) were dismantled and removed to prepare the building for
demolition and shaft cap construction.All asbestos abatement work was performed by NorthStar Demolition
and Remediation, Inc. (NorthStar),formerly known as LVI Environmental Services, Inc., a certified General
Abatement Contractor in the State of Colorado. Abatement work began on August 11, 2014 and final
clearance air sampling was performed on August 19, 2014. The results of the air clearance sampling
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