NID Board of Directors authorizes $6.6M for Combie Reservoir Mercury Removal Project

June 28, 2018

The Nevada Irrigation District (NID) Board of Directors agreed to award contracts worth $6.6 million to the Combie Reservoir Sediment and Mercury Removal Project during its June 27 meeting.

This pilot project will remove and clean approximately 80,000 cubic yards of sediment from Combie Reservoir using an innovative centrifuge process to reduce elemental mercury in the Bear River watershed. The removed sediment will reduce potential human exposure to methylmercury, as well as restore water storage capacity in the reservoir.

Contracts that were approved during Wednesday’s meeting:

• $4.6 million to Great Lakes Environmental & Infrastructure and Teichert Aggregates for removal of the sediment

• $520,000 to Holdredge & Kull/NV5 for project management

• $869,000 to the U.S. Geological Survey (USGS) for collection and analysis of the sediment

• $600,000 to Teichert for storage of the cleaned sediment.

The total project is estimated to cost $7.5 million. NID will contribute $2 million and the Department of Water Resources (DWR) will provide $5.5 million in grant funding.

The contracts NID Directors authorized on Wednesday call for work to begin this September to remove sediment in dry conditions. Dredging in wet conditions is scheduled to being in February 2019. The USGS began work last fall to establish seasonal baseline conditions of the reservoir.

The District’s partners include The Sierra Fund, DWR, Great Lakes Environmental & Infrastructure, Teichert Aggregates and USGS.

Most of the Sierra watersheds contain elevated concentrations of mercury, a remnant of gold processing practices used more than a century ago. This pilot project in intended to demonstrate that mercury can be effectively removed from river sediments which can then be applied at other reservoirs throughout the Sierra Nevada.

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The Nevada Irrigation District (NID) Board of Directors agreed to award contracts worth $6.6 million to the Combie Reservoir Sediment and Mercury Removal Project during its June 27 meeting.

This pilot project will remove and clean approximately 80,000 cubic yards of sediment from Combie Reservoir using an innovative centrifuge process to reduce elemental mercury in the Bear River watershed. The removed sediment will reduce potential human exposure to methylmercury, as well as restore water storage capacity in the reservoir.

Contracts that were approved during Wednesday’s meeting:

  • $4.6 million to Great Lakes Environmental & Infrastructure and Teichert Aggregates for removal of the sediment
  • $520,000 to Holdredge & Kull/NV5 for project management
  • $869,000 to the U.S. Geological Survey (USGS) for collection and analysis of the sediment
  • $600,000 to Teichert for storage of the cleaned sediment.

The total project is estimated to cost $7.5 million. NID will contribute $2 million and the Department of Water Resources (DWR) will provide $5.5 million in grant funding.

The contracts NID Directors authorized on Wednesday call for work to begin this September to remove sediment in dry conditions. Dredging in wet conditions is scheduled to being in February 2019. The USGS began work last fall to establish seasonal baseline conditions of the reservoir.

The District’s partners include The Sierra Fund, CA Department of Water Resources, Great Lakes Environmental & Infrastructure, Teichert Aggregates and the United States Geological Survey.

Most of the Sierra watersheds contain elevated concentrations of mercury, a remnant of gold processing practices used more than a century ago. This pilot project in intended to demonstrate that mercury can be effectively removed from river sediments which can then be applied at other reservoirs throughout the Sierra Nevada.

 

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