EXH0369021347

Subj: The Port of Seattle's Revised Implementation Plan for the Des Moines Creek Flow Augmentation Facility (see transmitted letter to Tom Luster, Department of Ecology, from Keith Smith, Port of Seattle, dated August 18, 2000). Dear Mr. Luster: At the request of the Airport Communities Coalition, I have evaluated the Port of Seattle's revised plans to use City of Seattle drinking water (also referred to as Seattle Public Utilities [SPU] water) to augment summer low flows in Des Moines Creek. You will note that I reviewed the Port's initial plans in my letter to you on August 21, 2000. Of particular concern in my assessments, has been the potential toxicity of chlorine and • fluoride, which are introduced to the City of Seattle's drinking water supply by the Seattle Water Department. Possible effects associated with differences in conventional water quality parameters, e.g., temperature, dissolved oxygen, pH, and alkalinity, between drinking water or well water and stream waters, were also assessed. Formation of Potentially Harmful Chlorinated By-Products Is Ignored. am pleased to see that the Port has at least considered dechlorination in their revised plan when considering use of City of Seattle drinking water as the source of augmentation water. I still have concern that even after treatment, residual chlorine will persist and form chlorinated by-products harming fish and other aquatic life in Des Moines Creek. The Port has yet to decide on which treatment alternative it will use and presents no data on the efficacy of any of the treatment…

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PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]