REP31086

• Permit No: C1981023
• IBM Index Class Name: Report
• Doc Date: 1/31/1997
• Doc Name: 1996 ANNUAL HYDROLOGIC MONITORING REPORT
• Annual Report Year: 1996
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

Annual Certification
Operator. Kaiser Ventures, inc.
t Facility: Chimney Rock Mine, C-81-023
Pond Identification: Pond Number 003
' Type of Pond: Sedimentation. Earthen embankment. Riprap-lined emergency spillway.
Corrugated metal pipe (CMP) trickle tube with metal baffle plate primary
' spillway.
Rules 4.05.9 (10) and (11)
' The basis for this section of this certifiption is Rule Number 4, Section 4.05.9 (10) and (11) of the
Regulations of the Colorado Mined Land Reclamation Board for Coal Mining. References within this
certification quote Rule Number 4 unless otherwise noted.
' (a) Existing and required monitorinft procedures and instrumentation.
' Inspections of the pond are required quarterly ]Rule 4.05.6(13)]. Quarterly inspections were made on 328!96,
627196, 927/96, and 29 October 1996.
' A stake (instrumentation to monitor sediment volume, Permit, Para 2.05.3, Page 2.05-2, Rev. 3.1-94) is in the
pond.
(b) The desien depth end elevation of env impounded waters et the time of the initial certification retort or
' the average and maximum depths and elevations of env Impounded waters over the oast year for the annual
certification reports.
' Based on the 1996 quarterly inspection reports, the average depth and elevation of impounded waters was 0.5'
and 6453.5, and the maximum depth and elevation was 0.8' and 6453.8', respectively.
' Ic) Existing storage capacity of the dam or embankment.
The existing storage capacity of the dam is estimated to be approximately 1.0 acre feet [from the existing
sediment level to the invert of the emergenry spillway (reference the Sedimentation Pond As-built, Rev. I, 5-
' 30-91, and 4th Quarter 1996 Inspection Report)].
(d) Anv rtres occurring to the construction material up to the date of the Initial certification or over the past
' year for the annual certification reports.
No fires were reported up to the date of the initial certification, and no indication of fires in the construction
' materials of the dam was observed during the past year.
fe) Anv other aspect of the dam or embankment aRecting stability.
' The lack of protective vegetation subjects the embankment to erosion, which could contribute to embankment
instability. However, no erosional features have developed.
Chimney Rock Mine Pond #003 Certification, 3 December 1996, Page 1 of 3 Pages