Black Diamond wastewater infrastructure upgradeProject OverviewPhase One: wastewater storage facility The first phase centers on construction of an enclosed storage facility to equalize peak flows entering the existing pump station near Jones Lake. Peak flows will be stored and released slowly over time to avoid overwhelming the downstream conveyance system. See the map for information about the general location of storage facility alternatives.
The 750,000-gallon storage facility will extend the life of existing equipment and defer the need to build additional new pumping and pipeline facilities for several years. Phase Two: additional wastewater capacity to accommodate Black Diamond as it growsPhase two improvements could include larger conveyance facilities, a satellite treatment facility or a combination of both. A satellite treatment facility would be required to treat effluent to a standard high enough for it to be used to recharge wetlands, irrigate nurseries and parks, and for some industrial uses. Planning for phase two will be conducted simultaneously with the development of the phase one storage facility. The phase one storage facility will be compatible with any other improvements built in phase two. Your comments and ideas are welcomeKing County is committed to being a good neighbor and is interested in learning your view about this project. Together with the City of Black Diamond, King County's project team is working to ensure the new facilities fit with the community. The project team will work directly with the City and community to address concerns and minimize the project's potential community and environmental impacts. These efforts will continue during environmental review, permitting, construction and the facilities' long-term operations and maintenance.
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