The Reserve Silica Reclamation site is located between Ravensdale and Black Diamond, Washington. The site is in a historical mining area where coal and sandstone have been mined from a tilted bedrock formation south of Ravensdale Lake and Ravensdale Creek.
Two surface mining pits – the Lower Disposal Area and Dale Strip Pit – were reclaimed with cement kiln dust (CKD) and mining spoils between 1979 and 1988 under the permitting authorities of two King County agencies, currently known as King County Department of Local Services and Public Health – Seattle & King County.
CKD is a waste product from cement processing. CKD reacts with water to form calcium hydroxide, which can increase the pH to greater than 12 standard units creating caustic water. Caustic water has seeped from the Lower Disposal Area since the 1980s. The cleanup site is associated with the release of contamination from the CKD.
Reserve Silica Corporation and Holcim (US) Inc. entered into an agreed order under the state's cleanup law, the Model Toxics Control Act (MTCA) in December 2019. The Agreed Order requires the companies to complete a:
Remedial Investigation
Feasibility Study
Preliminary Draft Cleanup Action Plan
Ecology is inviting comments on the following Draft Remedial Investigation
The Remedial Investigation describes the site history, regulatory and environmental settings, field investigations, conceptual site model, and proposed cleanup standards for the Site.
Contact Information
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The Reserve Silica Reclamation site is located between Ravensdale and Black Diamond, Washington. The site is in a historical mining area where coal and sandstone have been mined from a tilted bedrock formation south of Ravensdale Lake and Ravensdale Creek.
Two surface mining pits – the Lower Disposal Area and Dale Strip Pit – were reclaimed with cement kiln dust (CKD) and mining spoils between 1979 and 1988 under the permitting authorities of two King County agencies, currently known as King County Department of Local Services and Public Health – Seattle & King County.
CKD is a waste product from cement processing. CKD reacts with water to form calcium hydroxide, which can increase the pH to greater than 12 standard units creating caustic water. Caustic water has seeped from the Lower Disposal Area since the 1980s. The cleanup site is associated with the release of contamination from the CKD.
Reserve Silica Corporation and Holcim (US) Inc. entered into an agreed order under the state's cleanup law, the Model Toxics Control Act (MTCA) in December 2019. The Agreed Order requires the companies to complete a:
Ecology is inviting comments on the following Draft Remedial Investigation
The Remedial Investigation describes the site history, regulatory and environmental settings, field investigations, conceptual site model, and proposed cleanup standards for the Site.
Contact Information
*Indicates Required Fields