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2019-04-08_GENERAL DOCUMENTS - M1977493
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2019-04-08_GENERAL DOCUMENTS - M1977493
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Last modified
12/27/2024 9:18:48 AM
Creation date
4/8/2019 2:00:24 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977493
IBM Index Class Name
GENERAL DOCUMENTS
Doc Date
4/8/2019
Doc Name
Notificaton & Implementation of Mod 2 for Seepwater Return
From
Climax
To
DRMS
Email Name
ECS
Media Type
D
Archive
No
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-COM <br /> August 2, 2018 <br /> Mr. Tyson Parrott <br /> Climax Molybdenum Company <br /> 11236 Highway 91 <br /> Climax, CO 80429 <br /> Subject: Mayflower Seep Water Return Line North Cutout Discharge Review, Climax <br /> Mine, Colorado <br /> Dear Tyson: <br /> AECOM serves as the Engineer of Record(EOR) for the Mayflower(5 Dam) Tailings Storage <br /> Facilitates (TSF) at the Climax Mine, near Fremont Pass Colorado. In this capacity AECOM was <br /> recently requested by Climax Molybdenum Company (Climax) to review the Mayflower Seepwater <br /> pipeline transition plan and evaluate any potential dam safety impacts on 5 Dam. <br /> The Mayflower Seepwater pipeline pumps seepage water from the toe of 5 Dam up to the Seep <br /> Water pond and pump station near the toe of 3 Dam(Tenmile). This 24-inch HDPE pipeline is not <br /> located within the current structural shell of the dam. Currently the pipeline is known to leak within <br /> the pond area approximately 2,000 ft upstream from the current crest and 200 feet from the <br /> shoreline. The leak is assumed to be a result of a faulty valve buried approximately 12 to 15 ft (in <br /> 2017)below the tailings surface in this area. As discussed in a letter dated September 14, 2017 to <br /> Mr. Raymond Lazuk with Climax it is our opinion that the leak identified has no impacts on 5 Dam <br /> stability, either currently or for the foreseeable future. This pipeline will eventually become <br /> inoperable in the next 2 to 3 years as the dam continues to rise. <br /> It is our opinion that a seep water discharge outlet in the North cutout channel would not have <br /> impacts on 5 Dam stability. The discharge is not located within the structural dam shell and is at <br /> approximately the same distance from the crest as the leadoffs. AECOM will continue to work with <br /> the Climax team to monitor the discharge to confirm the flow goes toward the decant pond and does <br /> not wrap around toward the crest, observe depositional behavior in the area, and also to monitor <br /> piezometer data as part of the regular review of the TSFs performance. During the summer months <br /> with active spigot deposition, the depositional behavior in this area should also be monitored closely <br /> by Climax to confirm proper dam construction methods are still being implemented. <br /> AECOM <br /> 6200 S Quebec St <br /> Greenwood Village,CO 80111 <br /> www aecom.com <br /> M\DC5\PROJECTS\WTR\60568895 CLX FOR 18\500 DELIVERABLES\502 5 DAM SEEP\CLIMAX 5 DAM MOLY SEEPWATER LINE REV 0 DOCX <br />
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