2000-02-17_REPORT - m1980244

• Permit No: m1980244
• IBM Index Class Name: REPORT
• Doc Date: 2/17/2000
• Doc Name: QA RPt for 1999 ADR Expansion Construction
• From: CC&V
• To: DRMS
• Media Type: d
• Archive: No

Golder Associates Inc.
44 Union Boulevard,Suite 300 VE _ Golder
Lakewood,CO USA 80228 ' Assoeites
Telephone[phone]
Fax[phone]
January 24, 2000 Our Ref.: 993-2011
Cripple Creek & Victor Gold Mining Company
P.O. Box 191
100 North 3rd Street
Victor, Colorado 80860
Attention: Mr. Ron Roberts
RE: 1999 ADR EXPANSION CONSTRUCTION QUALITY ASSURANCE (CQA)
MONITORING
Dear Ron:
The Cripple Creek & Victor Gold Mining Company (CC&V) requested geotechnical
Construction Quality Assurance (CQA) services be performed by Golder Associates Inc.
(Golder) on the 1999 ADR Expansion. Construction was performed by Industrial System
Inc. (ISI), Ames Construction Inc. (Ames), and Poly-flex Construction Inc. (Poly-flex).
During the period of August 8, 1999 through November 8, 1999, Golder observed and
documented construction activities including, laboratory testing of soils and geomembrane,
Backfill and Special Backfill placement, Soil Liner Fill (SLF) placement, geomembrane
deployment, and Drain Cover Fill (DCF) placement.
Golder performed laboratory tests for grainsize distribution, Atterberg limits, and
compaction on samples of Backfill (SF-1), Special Backfill (SB-1 and SB-2), SLF (SLA-4),
and DCF (DCF-1). Laboratory tests were conducted in accordance with applicable ASTM
test methods and results met or exceeded the construction specifications. Laboratory test
results and are presented in Attachment A.
In memorandums to CC&V dated August 12, 1999 and September 25, 1999, Golder
reviewed Special Backfill test results submitted by ISI and determined the material met the
intent of the design. Therefore, Golder considered all of the materials acceptable.
Field earthworks testing was conducted by Golder on Backfill and SLF placed during 1999
ADR Expansion construction. Golder performed in-place moisture density testing on
Backfill material placed by ISI to verify that the material was placed in uniform layers of
approximately 8 inches and compacted using a hand operated vibratory compactor to
achieve a minimum relative density of 95% of modified Proctor dry density (ASTM-1557).
SLF field testing of approximately 370 cubic yards of SLF included monitoring of
placement and preparation for geomembrane deployment, testing in-place moisture and
density, and monitoring depth. Soil Liner Fill placement was performed in accordance
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