Black Diamond Wastewater Infrastructure Upgrade
New wastewater facilities to serve Black Diamond's growing population

Alternative C - Storage tunnel

A 12-foot diameter in-line storage tunnel would be installed west of the existing King County pump station towards the abandoned lagoon site. A flushing station/odor control facility would be required at the upstream end of the tunnel. A pump would lift flow from the tunnel to a smaller sewer pipe for transport back to the pump station after heavy flows subside.

Alternative C- Storage tunnel
(.PDF file, 1.4MB)

For more information

• Contact Doug Marsano about King County's project at 206-684-1235 or doug.marsano@kingcounty.gov

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Department of Natural Resources and Parks
Wastewater Treatment Division
201 S. Jackson St.
Seattle, WA 98104-3855
Fax: 206-684-1278

Updated: April 18, 2008

WTD Construction Projects

Conveyance System Improvement Program

Regional Wastewater Services Plan