HYDRO23319

• Permit No: C1981019
• IBM Index Class Name: Hydrology
• Doc Date: 1/5/2004
• Doc Name: Addendum to 2003 Annual Impoundment Inspection Report
• From: Knight Piesold and Co
• To: DMG
• Permit Index Doc Type: Prof Pond Certifications
• Media Type: D
• Archive: No

KENNECOTT ENERGY COMPANY
COLOWYO COAL COMPANY L.P.
ANNUAL IMPOUNDMENT INSPECTION
NPDES PONDS AND OTHER HOLDING PONDS
DATE: 9/19103

m undment Name Erosion, Instability,
Structural Weakness,
Hazardous Conditions
4.05.9 15 a
Monitodng procedures
and Instrumentation
4.05.9 15 b
Depth of
Impounded Waters
4.05.9 15 c
Elevation at
Impounded Waters
4.05.9 15 c
Existing Storage
Capacity
4.05.9 15 d
Other Structural Instabiliy
or Maintenance Required
4.05.9 15 a
Experienced
Impoundment
Ins actor 4.05.914
Date
of
Ins action
Streeter Pond-001A None Drtly, Annual Insp. 4.6 ft. 6582.6 0.93 ac-ft. None K.R. Blunt 9/19/2003
Work Area Sediment Pond - 002A None Ortly, Annual Insp. 3.5 ft. 7149.5 7.84 ac-ft. None K.R. Blunt 9/19/2003
Gossard Pond - 003A Nane Orty, Annual Insp. 1.8 ft. 6386.0 1.34 ac-H. None K.R. Blunt 9/19/2003
Gulch APond - 004A None Ortly, Annual Insp. 4.5 ft. 6609.5 4.36 ac-ft. None K.R. Blunt 9/19/2003
Stoker Siding Pond- OOSA None Ortly, Annual Insp. 2.7 ft. 6324.5 O.fi ac-ft. None K.R. Blunt 9/19/2003
Loop Pond - OO6A None Drtly, Annual Insp. 3.5 ft. 6347.5 0.86 ac-ft. Will be dredged Ocl. 2003 K.R. Blunt 9/19/2003
Prospect Pond - 007A None Ortly, Annual Insp. Dry Dry 1.5 ac-ft. None K.R. Blunt 9/19/2003
Wes[ Pit Pond - 008A None Ortly, Annual Insp. Dry Dry 4.4 ac. ft. Will be dredged Ocl. 2003 K.R. Blunt 9/19/2003
Section l6 Pond-009A None Ortlg Annual Insp. 3.5 ft. 7743.5 1.2 ac-ft. None K.R. Blunt 9/19/2003
East Taylor Pond - 010A None Drtly, Annual Insp. 6.0 ft. 6936.0 2.2 ac-ft. None K.R. Blunt 9/19/2003
Taylor Pump Holding Pond None Annual Insp. 2.0 ft. 6551.0 3.5 ac-ft. None K.R. Blunt 9/19/2003
Evaporation Pond North None Annual Insp. Dry Dry 5.1 ac-R. None K.R. Blunt 9/19/2003
Evaporation Pond South None Annual Insp. Dry Dry 4.2 ac-ft. None K.R. Blunt 9/19/2003
Aeration Pond Nane Annual Insp. 9 0 ft. 7212.0 4.1 ac-ft. None K.R. Blunt 9/19/2003
Sediment Sump None Annual Insp. 8.5 ft. 7238.5 0 86 ac-ft. Will be dredged Oct. 2003 K.R. Blunt 9/19/2003
Washbay Pond-0028 None Annual Insp. 8.5 ft. 7204.5 15.65 ac-ft. None K.R. Blunt 9/19/2003
2oW Hnnual Imvoonamanl Inspection pacemoer 30.2003