DO TMDL Materials

University of Washington Final Report on phosphorus bio-availability from various Spokane River discharge points.

This concept provides a means for point source dischargers to meet permit limits by providing “mutual aide,” e.g.– utilizing unused permit discharge allowance from one point source to meet overage at another point source.

Ecology memo that provides outline for steps to quantify stormwater credits.

Web site archiving water quality trading articles from around the nation.

A memo from Portland State University describing the results of the latest CE-QUAL-W2 modeling.

Ecology technical review of Spokane Regional Wastewater Phosphorus Bio-availability Study

At the December 16th DO TMDL Implementation Advisory Committee meeting, Ecology was requested to sort comments to the draft Water Quality Trading Framework by category (type). The attached document from Ecology does this.

This presentation was presented by the University of Washington at the December 16th DO TMDL Implementation Advisory Committee.

Professor Micheal Brett’s presentation provides an overview of Bio-availability study objectives.

Authors state “The objective of this study was to use algal bioassays to determine the Bio-available Phosphorus (BAP) of effluent treated by the pilot projects at the main WWTP discharges to the Spokane River. This is critically important because it is currently unknown whether the effluents of facilities designed for advanced P removal tend to make the residual P more or less bioavailable compared to conventional treatment processes.”