1996-07-25_HYDROLOGY - M1977493

• Permit No: M1977493
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/25/1996
• Doc Name: As-Built Drawings, Doc. and Cert., Robinson Lake Cut-Off Wall
• From: TITAN Environmental
• To: Climax
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

.i III I II I II I II IIII III
999
= v=Environmental
Titan Environmental Corporation
-939 E Arapahoe Rd , SUIte 230
E,nule\N ood. Colorado 80112
July 25, 1996 Phone [phone]
Fax [phone]
5101-004
Mr. Bryce Romig
Environmental Coordinator
limax Mine
Highway 91
- 9��- 9
Climax, CO 80429
TRANSMITTAL
j/'�As-Built Drawings,Documentation, and Certification
Robinson Lake Cut-Off Wall
Dear Bryce:
As requested, Titan Environmental Corporation (TEC) has prepared as-built drawings,
supporting documentation, and certification for the construction of the Robinson Lake
cut-off wall at the Climax Mine. Also attached are photographs taken at various stages of
construction which document the building of the cut-off wall.
The original design for the cut-off wall which was submitted to the State Division of
Minerals and Geology of the Colorado Department of Natural Resources, included the
following features:
• A single, 8-inch reinforced concrete cut-off wall constructed across the downgradient
drainage of Robinson Lake. The cut-off wall was to be keyed into the underlying
competent bedrock within a 24-inch (minimum) deep trench excavated into the
bedrock;
• A perforated, drainage collection pipe placed within a trench excavated on the
upgradient side of the cut-off wall. The collection pipe would be wrapped in a
geosynthetic cloth and surrounded with a coarse sand/gravel backfill to facilitate
drainage; and
• Two sumps connected by a manifold to the drainage collection pipe. These sumps
would be used to remove ground water intercepted by the cut-off wall and convey it
to the Robinson Reservoir.
C\PROJECTS�5101-004\L,1525101 004