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Barton and Murray (West Seattle) CSO Control Facilities Plan

Facilities Plan Cover - Barton and Murray CSO Control, Draft, February 2011King County has developed proposals to control combined sewer overflows (CSOs) at two locations in West Seattle—the Barton and Murray CSO basins. One project is the construction of a new 1.0-million-gallon storage tank on the east side of Beach Drive SW near Lowman Beach Park to control CSOs in the Murray CSO basin. The other is the installation of rain gardens in the right-of-way along 32 to 64 half-blocks in the Sunrise Heights and Westwood neighborhoods east of 35th Avenue SW to control overflows in the Barton CSO basin.

The Barton and Murray Combined Sewer Overflow Control Facilities Plan describes the reasons for these projects, the processes used to develop and evaluate alternatives, and the selection of proposed alternatives to advance for further environmental review. These projects are necessary to control CSOs in compliance with RCW 90.48.480 and WAC 173-245-020 (22).

This plan is submitted in compliance with the first of three compliance schedule dates noted in Section S18 of the West Point Treatment Plant National Pollutant Discharge Elimination System Permit (refer to page 53 of permit).

Final Facility Plan, September 2011

Draft Facilities Plan, February 2011

This project was initiated to address the following:

  • Revised Code of Washington (RCW) 90.48.480: This law requires “the greatest reasonable reduction of combined sewer overflows.”
  • Washington Administrative Code (WAC) 173-245-020 (22): “The greatest reasonable reduction’ means control of each CSO in such a way that an average of one untreated discharge may occur per year.”