2012-02-01_INSPECTION - M1980244

• Permit No: M1980244
• IBM Index Class Name: INSPECTION
• Doc Date: 2/1/2012
• Doc Name: Phase IV Berm Repair
• From: amec
• To: CC&V
• Inspection Date: 11/17/2011
• Email Name: TC1
• Media Type: D
• Archive: No

Memorandum
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To: Timm Comer (c ✓) File No.: 84201125E0
From: Jay Janney -Moore P.E. 64/ )
Date : February 1, 2012 `
Subject: Phase 5 Northern Berm Washout
AM EC Environment & Infrastructure
2000 S. Colorado Blvd., Suite 2 -1000
Denver, CO 80222
Tel [phone]
Fax: [phone]
www.amec.com
ANA Ort.ivelz
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cc: Kimberly Morrison, P.E. R.G.
Cripple Creek and Victor Gold Mining Company (CC &V) contacted AMEC
Environmental and Infrastructure (AMEC) on November 2, 2011 about a section of the
Phase 5 PSSA Northern Containment Berm being washed out. It is AMEC's
understanding that CC &V was performing an inspection on the process solution pipeline
in the period prior before the washout. Upon completion of the inspection, CC &V
personel did not re- install the blind flange on the pipeline before turning the solution
back on. As a result of this action, solution flowing at a rate of 200 gallons per minute
for approximately one hour eroded the downstream side of the containment berm. The
location of the washout is in the groan between the Phase 5 Containment Berm and the
Phase IV VLF, all within the footprint of the Phase IV lined area.
AMEC personel, Jay Janney -Moore and Kimberly Morrison, completed a site visit on
November 3, 2011 and visually inspected the washout. The damage to the containment
berm was limited to the groan area where the solution washed away a small volume of
the material and created a depression. Direction was given to replace the displaced
materail in accrodance with the Phase 5 VLF structural fill specification in section
02200.0.
Ames Construction was contracted to perform the washout repair. A CAT 980 front -end
loader, a CAT 950 front -end loader, a CAT D -6 dozer, a CAT 563 vibratory smooth
drum compactor, and a tandem axle water truck were used to perform the repair. The
material displaced from the washout area was replaced by transporting the material
using the front -end loaders and placing it in 18" to 24" lifts using the dozer, keying into
existing slopes. Each lift was moisture conditioned using a tandem axle water truck
(when necessary) and compacted using a 10 -ton vibratory smooth drum compactor,
passing over the entire fill surface at least 4 times (method compaction technique was
applicable). All repair activities were monitored by an AMEC field representative and
performed in accordance with the above referenced specification.