340821-001 FINAL United Keno HHERA 4 May 2011

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Human Health and Ecological Risk Assessment for the Historic Keno Hill Mine Site Table 2.1 Summary of Aquatic Environment Reports Document title Content Prepared by Period covered Elsa Reclamation and Development Company Keno Hill Mine Keno Hill Silver District Site Investigation and Improvement, Special Projects Fisheries Assessment Project September 17-19, 2008 Environmental Quality of Receiving Waters at United Keno Hill Mines Ltd., Elsa Yukon South McQuesten Water Quality Sampling Program - Year 2 Keno Valley Receiving Water Monitoring Program, 2004/2005 Keno Valley Stream, Sediment and Benthic Invertebrate Monitoring Programs, 2007 Water Quality Assessment Report for United Keno Hill Mines Aquatic Resource Assessment Report for United Keno Hill Mines Investigation into fish presence, fish habitat and metal uptake in fish tissue; fish tissue analysis and comparison to previous data; investigation into barriers to fish movement which exist and may require removal; sediment quality Measurements of water (flow, metal concentrations and general water chemistry), sediment (particle size, metal concentrations) and benthos (population) Water quality results from four sampling periods to capture seasonal variation, and development of natural background levels of metals. Investigation of hydrology (water level, flow, basins characteristics), water quality (metals and general chemistry) and sediment quality (metals) Measurements of sediment quality (metals) and benthos (population) parameters Assessment of the existing water quality data from impacted rivers and creeks as well as background stations Summary of water quality from the area from 1994 through to 2007, assessment of sediment quality data from impacted and background stations, and evaluation of data from recent benthic community and fish surveys and comparison to results from previous studies. Access Consulting Group (Access 2009) Davidge and Mackenzie- Grieve (1989) Environmental Dynamics Inc. (EDI 2005) Laberge Environmental Services (Laberge 2005) Laberge Environmental Services (Laberge 2008) Minnow Environmental Inc. (Minnow 2008) Minnow Environmental Inc. (Minnow 2009) 340821-001 – FINAL – May 2011 2-5 SENES Consultants Limited 2008 1974-75 & 1980 & 1985 2004-2005 2004-2005 2007 Historical (1994- 2007) Historical (Water [1994-2007], sediment [1985, 1994, 2004, 2007] , benthos [1985, 1994, 2007], fish [1994/1995, 2006])
Human Health and Ecological Risk Assessment for the Historic Keno Hill Mine Site Table 2.1 Summary of Aquatic Environment Reports (Cont’d) Document title Content Prepared by Period covered Analyses of Invertebrate and Sediment Data for the Keno Hill Mine Water License (QZ06-074) Long-Term Aquatic Monitoring Program for United Keno Hill Mines Approach for Developing Water Quality Goals for United Keno Hill Mines Fish and Fish Habitat Assessment Conducted Near Elsa, Yukon for United Keno Hill Mines August 1994 – September 1995 Fisheries Assessments Conducted in the Keno Hill Mining Area, Including Metals Analysis of Fish Tissue Samples Scope of monitoring (sample types, substances, sampling frequency and locations) and reporting requirements for sediment quality and benthic community monitoring in support of water license Identification of the requirements for a comprehensive, site-wide long-term aquatic monitoring program to be developed in support of the environmental assessment, closure planning, and regulatory processes in the short-term Review of water quality at Keno Hill Mine site to develop water quality goals for Christal and Flat Creeks and to confirm best approach for water quality assessment in the South McQuesten River Fisheries investigation (population, heavy metals in tissue), and habitat availability and utilization by fish Fish habitat, fish utilization and metal content of fish flesh Minnow Environmental Inc. (Minnow 2010a) Minnow Environmental Inc. (Minnow 2010b) Minnow Environmental Inc. (Minnow 2010c) White Mountain Environmental Consulting (WMEC 340821-001 – FINAL – May 2011 2-6 SENES Consultants Limited 1996) White Mountain Environmental Consulting (WMEC 2006) 2009 Historical, and 2009 Historical 1994-1995 2006
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340821-001 FINAL United Keno HHERA 4 May 2011

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