HYDRO27962

• Permit No: C1980002
• IBM Index Class Name: Hydrology
• Doc Date: 6/15/1984
• Doc Name: OHIO CREEK COAL MINE 2
• From: FOX CONSULTANTS INC
• To: MLRD
• Permit Index Doc Type: PROF POND CERTIFICATIONS
• Media Type: D
• Archive: No

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May 28, 1984
MINCON INC., P.C.
5504 Jefferson Ave.
Denver, Colorado 80237
[phone]
[phone] RECEIVED
Mr. George [d.L. Robinson
Fox Consultants Inc.
710 Kipling
Lakewood, Colorado 80226
Dear 61r. Robinson:
JUN 1 51984
MINED LAND RECLAMAl10N OIVISIOM
Cola OeAt o! Nafura! Retipul~
Per our phone conversations during the week of May 14th, Mincon
Inc. P.C. is pleased to provide professional services to verify
the construction of the sedimentation pond at the O.C. :~o. 2 ?,:ine.
2ond design criteria has been supplied by Fox Consultants and is
based on the Gingery Associates Inc.'s report dated July 16, 1980.
On May 21st, a site visit was made by Mr. William Balaz, Mincon,
accompanied by Mr. Bob Weaver, O.C. No. 2 Mine Foreman. The
dimensions of the constructed pond were measured and compared tc
the Gingery Associates' design specifications. The results are:
1•) The pond is built in the approximate location on the
hillside as shown but may be slightly lower in elevation.
This is based on a calculated top of berm elevation of
9080 (by altimeter) compared to a design elevation of
9139.5• This appears to have been done to facilitate
construction by minimizing the cut required and to
locate the pond on a flatter slope.
2.) The pond is constructed to approximate design dimensions
as shown in the Appendix.
3•) The pond slopes appear to approximate the required 2:1
and 3:1 grades. Calculations and comments based on field
observations are included in the A ppendix.