REP47851

• Permit No: C1981019
• IBM Index Class Name: Report
• Doc Date: 3/29/2002
• Doc Name: 2001 AHR & ARR Letter to Exhibit 3
• Annual Report Year: 2001
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

7/11/02
C-81-019
AHR
RULE 4.05.9(17)
Rule 4.05.9(171
Colowyo inspects all impoundments quarterly by a qualified person designated by the operator,
for appearance of structural weakness and other hazardous conditions. The reports are
retained at the mine site, and copies of the reports are submitted to the Division in Exhibit i of
this Annual Report. Colowyo submitted Technical Revision 55 (TR-55) to the Division on
December 11, 2002. TR-55 requested approval to waive the requirement for quarterly
impoundment inspections of impoundments which are not the primary sediment control
structure for a particular area; are constructed in reclaimed areas of the mine to enhance the
approved postmining land use; which are completely incised, or which have a storage capacity
no greater than two-acre feet and an embankment no greater than five feet in height, while
maintaining an annual inspection as required by Rufe 4.05.9(14). At the Division's request, and
in accordance with Rule 4.05.9(18)(b), Colowyo is preparing a written safety demonstration by a
professional engineer. Colowyo will continue performing 4uarterly inspection of these types
(stockponds/small depressions) of impoundments until the Division has approved TR-55.
RULE 4.05.13(4)(c) Monitoring Report Requirements (surface and ground water)
All analytical results from surface and ground water monitoring have been tabulated and are
kept on file at Colowyo Coal Company L.P. Historical data is presented in this AHR. The
monitoring timeframe for this annual report is from January 1, 2001 through December 31,
2001. A description of the surface and ground water monitoring plan is located in Colowyo's
CDMG Permit, Volume 1, Section 4.05.13 on page 4.05-10 of the permit.
Surface water monitoring sites comprise one upstream and two downstream sites and are
briefly described below:
New Upper Good Springs Creek (NUGSC) -upstream site, located south of the mine
along Moffat County State Highway 13.
Lower Good Spring Creek (LGSC) -downstream site, located below active mining
conditions along Moffat County State Highway 13.
• Lower Taylor Creek (LTC) -downstream site, located below active mining conditions
along Moffat County Road 17.
Ground water monitoring sites comprise one up dip and two down dip shallow alluvial wells and
are briefly described below:
A-6 Well (A-6) -located south of the mine along Moffat County State Highway 13.
North Good Springs Well (NGSW) -located along Moffat County State Highway 13.
Gossard Well -located within the rail loop facility. Access to this well is through Colowyo.
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