REV94136

• Permit No: C1981071
• IBM Index Class Name: Revision
• Doc Date: 10/28/1987
• Doc Name: APPROVAL FINDINGS TR 13 ECKMAN PARK PN C-81-071
• From: MLRD
• To: ECKMAN PARK HYDROLOGY FILE
• Type & Sequence: TR13
• Media Type: D
• Archive: No

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°F `°~° STATE OF COLOI~1~0
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• " 8 Roy Romer, Governor
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DEPARTMENT OF NATURAL RESOURCES
MINED LAND RECLAMATION DIVISION ~~
DAVID C. SHELTON, Director
DATE: October 28, 1987
T0: Eckman Park Hydrology File
FROM: Catherine W. Begej ~~
RE: APPROVAL FINDINGS TECHNICAL REVISION 13, ECKMAN PARK, PERMIT
N0. C-81-071
Introduction:
A coal operator must submit a revision to the Mined Land Reclamation
Division to leave an impoundment at a site on a permanent basis, Seven
criteria must be met from Rule 4,05.9(1). This document outlines '
compliance with all seven criteria, and is submitted to the file to
compensate for the brevity of the technical revision and to present a
rationalization for the decision which was made. The staff felt a
detailed review was necessary in light of the marginal water quality and
the size of the impoundment (210 acre feet).
The post-mining land use of the impoundment is stock-watering and fish
and wildlife habitat. Water quality of the impoundment is unsuitable for
irrigation purposes.
4,05,9(1) Permanent impoundments for beneficial use of stored
water may only be authorized in accordance with applicable state
law and upon the basis of the following demonstration:
(a) The quality of the impounded water shall be suitable
on a permanent hasis for its intended use, and discharge of water
from the impoundment shall not degrade the quality of receiving
waters to less than the water-quality standards established
pursuant to applicable State and Federal laws;
The water discharging from Pond A, sampled at Site 39, is a slightly.
alkaline, calcium sulfate water, with an average hardness exceeding 465
mg/1, Several parameters periodically exceed water quality standards,
and each will be discussed individually,
The water occasionally exceeds irrigation standards for molybdenum, but a
review of the data showed that poor detection limits were at fault.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]