HYDRO31393

• Permit No: C1981022
• IBM Index Class Name: Hydrology
• Doc Date: 8/17/1994
• Doc Name: SOMERSET MINING CO TR-022 SUBSTATION NO 3 SEDIMENT POND CERTIFICATION PN C-81-022
• From: SOMERSET MINING CO
• To: DMG
• Permit Index Doc Type: PROF POND CERTIFICATIONS
• Media Type: D
• Archive: No

1
SOMERSET MINING COMPANY
SEDIMENT POND A CERTIFICATION
In accordance with Rule 4.05.6(10), each sediment pond will be
inspected during construction under the supervision of, and
certified after construction by, a qualified registered
professional engineer. This certification is for the construction
of Sediment Pond A at the Somerset Mine which was constructed
during October and November of 1992 and completed on December 3,
1992 with the installation of the dewatering pipe.
The construction of pond A was actually and enlargement of existing
sediment pond 12. The construction of the pond was supervised by
L. x. Jewkes, an EIT and_Colorado School of Mines graduate, who
works under my supervision. Mr. Jewkes has a wide variety of
experience in the construction industry.
Pond A is near the entrance to the Somerset Mine just west of the
silo along the railroad tracks, east of the main entrance to the
mine site. This pond is a dugout type pond, therefore it does not
have true compacted embankments. The design of pond A is shown on
drawing 5-040, dated 01-30-92. The design calculations for pond A
are contained in Appendix B page B-102. The pond was constructed in
accordance with the approved plan except all of the design
elevations of the pond shown on drawing 5-039 were reduced one
foot. It was necessary to lower the pond one foot so it would
"fit" the exiting ground surface. The design capacity of Pond A is
as follows:
POND A CAPACITY - ACRE FEET
Water Sediment Total
0.077 0.016 0.093
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