2008-11-06_REVISION - M1980244

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 11/6/2008
• Doc Name: As Built Certification
• From: AMEC
• To: CC&V
• Type & Sequence: TR52
• Email Name: BMK
• Media Type: D
• Archive: No

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November 6, 2008
Mr. Mark Vanoni
Senior Environmental Coordinator
Cripple Creek & Victor Gold Mining Co.
Post Office Box 191
Victor, Colorado 80860
Re: Certification Letter Phase IVB/C Berm Raise
Dear Mark:

Project 84201125DO

Divisior

AMEC Earth and Environmental, Inc. (AMEC) has prepared this letter report certifying the construction of
the Valley Leach Facility (VLF) Phase IVB/C perimeter berm raise, as presented in the attached Drawings
1 and 2. The berm raise consisted of placing fill material onto the existing perimeter berm and placing
geomembrane liner over the berm. The berm raise geomembrane liner was welded to the existing VLF
liner and vacuum tested to form a watertight seam.
This letter report summarizes the overall berm raise construction and Construction Quality Assurance
(CQA) testing completed by AMEC.
Berm Raise Construction
Construction on the Phase IVB/C berm raise was initiated on October 23, 2008, with placement of Select
Structural Fill (SSF) onto the existing perimeter berm. The approximate extent of SSF placement is
shown on Drawing 1. The SSF was placed and compacted by Conley Construction to form a nominal
2-foot high berm above the existing perimeter berm. Note in most areas, the berm height exceeds 2 feet.
Since the berm raise is not intended for additional ore storage or solution storage, no CQA coverage was
required for the placement and compaction of the berm raise fill. In addition to fill placement, the Drain
Cover Fill (DCF) covering the existing perimeter berm surface was removed to expose the existing VLF
liner. The DCF was carefully removed by Conley Construction.
On October 30, Camanco, the geomembrane liner installer, began installation of the 80-mil single-sided
textured Linear Low Density Polyethylene (LLDPE) geomembrane over the berm raise. The
geomembrane installation occurred from October 30 through November 1. During this period,
approximately 12,000 square feet of LLDPE geomembrane was deployed and seamed. Photographs of
geomembrane deployment and seaming are presented in Figures 1 through 6. The LLDPE
geomembrane was provided by PolyFlex and is from the same production run that was used for the
Phase IV.
AMEC provided continuous CQA observation and documentation during the geomembrane deployment
and seaming. In accordance with the Amendment No. 8 Technical Specifications, trial seams and
destructive seam tests were conducted to verify extrusion seaming quality and strength. Results from the
trial and destructive seam tests are presented in Table 1, attached.
Over the three days of geomembrane deployment, six (6) trial seams were conducted. Two trial seams
were conducted per day: one in the morning and one in the afternoon. The trial seaming frequency
exceeded the minimum requirement of one trial seam per day. Peel and shear tests conducted on the
trial extrusion seams showed the peel strengths ranged from 113 to 188 pounds per inch (ppi), exceeding
AMEC Earth & Environmental, Inc.
304 Inverness Way South, Suite 490
Englewood, Colorado 80112
Tel: [phone]
Fax: [phone] www.amec.com
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SAPROJECTS\1125D CC&V adr & slf geotech. design\h2 - design\benn raise cert\berm raise certification letter Adoc