2000-02-10_REPORT - M1980244

• Permit No: M1980244
• IBM Index Class Name: REPORT
• Doc Date: 2/10/2000
• Doc Name: CQA Rpt for 1999 acitivites at "Load Out Bin" area of VLF
• From: CC&V
• To: DRMS
• Media Type: D
• Archive: No

Golder Associates Inc.
44 Union Boulevard,Suite 300 91. GOl(ler
Lakewood,CO USA 80228 ^^O�eS
Telephone[phone] �
Fax[phone]
January 24, 2000 Our Ref.: 993-2011
Cripple Creek & Victor Gold Mining Company
P.O. Box 191
100 North Yd Street
Victor, Colorado 80860
Attention: Mr. Ron Roberts
RE: 1999 LOB AREA CONSTRUCTION QUALITY ASSURANCE (CQA)
MONITORING
Dear Ron:
The Cripple Creek & Victor Gold Mining Company (CC&V) requested geotechnical
Construction Quality Assurance (CQA) services to be performed by Golder Associates Inc.
(Golder) on an area near the Load Out Bin (LOB). Construction activities were performed
by Ames Construction Inc. (Ames) and Poly-flex Construction Inc. (Poly-flex) during the
period of October 21, 1999 through October 25, 1999. Golder observed and documented
construction activities including, subgrade preparation, anchor trench excavation, Soil
Liner Fill (SLF) placement, geomembrane deployment, and Drain Cover Fill (DCF)
placement. The testing frequency, material, construction sequence, etc. met or exceeded
the required specifications for the project.
Field earthworks testing was conducted by Golder on SLF placed in the LOB area. Soil
Liner Fill field testing of approximately 40 cubic yards of SLF included monitoring of
placement and preparation for geomembrane deployment, testing in-place moisture and
density, and performing depth verification testing. Soil Liner Fill placement was
performed in accordance with the 1999 Phase III VLF construction specifications. Results
and approximate locations of field density testing performed on SLF are presented in
Attachment A. Although no permeability testing was specifically performed on SLF placed
at the LOB area, Golder has included a representative permeability test result of SLF from
the 1999 Phase III VLF construction in Attachment A.
To construct the LOB area in accordance with the 1999 Phase III specifications, Ames was
required to excavate approximately 35 feet of anchor trench along the east side of the
extension. In the location of the required anchor trench, bedrock was encountered at
ground elevation, making the excavation of the Phase III design anchor trench (3' deep and
2' wide) difficult. To assist constructability, a 4 ft deep by 1 ft wide anchor trench was
proposed as an alternative to the Phase III design anchor trench. Due to the minimal
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