REP23183

• Permit No: M1977004
• IBM Index Class Name: Report
• Doc Date: 4/14/2003
• Doc Name: Annuual Report
• Permit Index Doc Type: Annual Fee / Report
• Media Type: D
• Archive: No

Pitch Reclamation Project February 2002
2002 Annual Reclamation Repoli Page 14
' 4.4 Sediment Control Embankment
During the summer and fall of 2000, an investigation was conducted to determine the nature and
' extent of seepage on the downstream face of the Sediment Control embankment. The cause was
determined to be perched water within the core of the embankment. Homestake conducted repair
work during the summer and fall of 2001. There are nine (9) piezometers in the embankment where
the phreatic surface can be monitored. Four of the piezometers were completed in the core of the
embankment and were placed in the area of the perched seepage in 2001. Monitoring of these
piezometers in 2002 indicates an overall lowering of the phreatic surface in the core of the
embankment. These piezometers will continue to be monitored in 2003. A Sediment Embankment
' Report is submitted annually to the Colorado Division of Water Resources (CDWR) providing the
results of the embankment monitoring program. In addition, in 2002 a Remedial Design As-built
Report was submitted to the CDWR documenting the methods used to correct the seepage
I' problem, Both of these reports are provided in electronic Adobe Acrobat© Portable Document
Format on the CD attached to this report. No seepage was observed on the downstream face of the
embankment during 2002 and the embankment continues to perform within the intent of its design.
4.5 Waste Rock Dumps
Seven (7) piezometers were measured monthly to monitor seasonalphreatlc surface fluctuations for
the Indian Creek and Tie Camp waste rock dumps. Results were presented in the 2002
Geotechnical Monitoring Report submitted to the Division of Minerals and Geology (DMG) in
December 2002. Visual inspections of the waste rock dumps were made periodically, when weather
permitted. The piezometers continue to show deep ground water levels with minor seasonal
fluctuations in the phreatic surface. Details and figures of the 2002 monitoring of the waste rock
dumps were presented in the December 2002 report on file with the DMG and are provided in
electronic Adobe Acrobat© Portable Document Format on a the CD attached to this report.
4.6 Water Quality Monitoring
As outlined in TR4, Homestake has monitored water quality since 1994 to verify the intended
effectiveness of installation of the Pinnacle Adit plug. Water quality monitoring conducted in 2002
included sampling points located at the North Pit Lake discharge (Sample Point NPL), the Tie Camp
Creek drainage (Sample Points TCCDRN and TCC), the site discharge POC (Sample Point SW-
33), as well as spring and seep surveys conducted in the spring and fall.
Quarterly discharge-monitoring reports (DMRs), pursuant to Colorado Wastewater Discharge Permit
System (CWDPS) number CO-0022756, were submitted to the Colorado Department of Public
Health and Environment (CDPHE) for 2002. Monitoring for the CDPS was conducted at the
designated POC SW-33, shown on Figure 3. Analytical tests conducted for the DMRs at SW-33
included, flow, dissolved radium 226, total radium 226/228, total uranium, pH, total suspended solids
(TSS), total dissolved solids, oil and grease, potentially dissolved zinc, and whole effluent toxicity
(WET) analyses as required by the CDPS. During 2002, all analytical results were below the CDPS
permit's 30-day average or daily maximum limitation. The 2002 DMRs are on file with the CDPHE-
Water Quality Control Division.
2002_ RECLAMATION RPT.DOC