EXH0368021341

At the request of the AirportCornmun/fi_ Coalition, I have assessed the Port of Seattle's declaredintent to use City of Seattle drinkingwater to augment summerflows in Miller orDes Moines Creeks when flows fall below 1.0cfs (cubic feet per second). Of particularconcern in my assessment, was the potential toxicity of chlorine andfluoride, which are introduced to the City of Seattle's drinking water supplyby the Seattle Water Department. Possible effects associated with ctifferencesin conventional water quality parameters,e.g., temperature,dissolved oxygen, pH, and alkaliaity, between drinking waterand streamwaters, were also assessed. In _ this assessment, I have relid on my education, specialized naining, andprofessional skills acquired overa 40- yearcareer as a Fisheries Biologist (see attached CurriculumVitae). Conclusion Inmyopinion,forthefollowingreasons,Cityof Seattleciriakingwatershouldnotbe used to augment summerlow flows in areastreams. Freec1"dorir_in drinkingwateris highly toxic to fish and other aquatic life, The free chlorinereacts with humic substances in surface waters forming a varietyof by-products that are persistent, bioaccumulated, and also toxic to fish and other aquatic life. Even with treatm_t, the levels of chlorinatedby-products may _11 be high enough to be harmful. Fluoride found in drinking water also can have both lethal and sublethal effects for fish and otheraquatic life, and may not be reduced to harmless l_'els employing current waste treatment technoiosy. Differences in conventional properties,e.g., t¢mperature,dissolved oxygen. pH, and alkalinity, berweev,drinking waterand stream water, may also produceimpacts. AR 021341 Use of well waterfrom sites within either the Miller or Des Moines Creeks v,atcrshecls is • potentially a less harm..Fulalternative; although even the use of well water can provexobe…

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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 [...]