EXH0304020451

These final meetingnoteshave beenprepared by Kate Snide'r,Floyd & Snider Inc. ATTENDEES Ann Kenny, Dept. of Ecology John Drabeck,Dept. ofEcology Kelly Whiting, King County Keith Smith,Portof Seattle Paul Fendt,Parametdx Rick Schaefer,EarthTech Felix Kristanovich,FosterWheeler Robert Fadd, Parametrix Pony Ellingson,PacificGroundwaterGroup MEETING SCOPE AND AGENDA The agendaof themeeting included: 1) Methodologyfor evaluatingmodelingresultsto determineimpactand mitigation 2) Vaultfillingestimates 3) Slice modelstatusand Hydrus interimdeliverable 4) Non-hydrologicaffects 5) Opera:.ionalPlan 6) =_xpectatiensfor meeting onJuly _- IMPORTANT NOTE: Modeling is underway to determine post-project low stream ;'lows. Modelinq .resultsare not yet available. Many issues were discussed in the 6/25 meeting regarding how the resultantdata will be evaluated. It is not yet confirmed whether thereare I_w stream flow impacts to the streams, or whether mitigationfor low stream flows will be required. The purpose of the 6]25 meeting was to discuss conceptually how the modeling rasu!:swilt _e evaluated, and how, if mitigation is required, it would be provided, These discussionswill be revisitedwhenthemodelinqr_sultsareevaluated. =-,_,==,,,,_-.= FINAL :o 07,'28/01 F_=. l Of4 ----____ AR 020451 401 Permit Decision-Making, Sea-Tac Airport Third Runway Floyd& Smdcrinc. June 25, 2001 METHODOLOGY RE: LOW STREAM FLOW IMPACT AND MITIGATION 1. Dates of 7-day low stream flow events have been plotted for the full (48 year) record for each watershed. These records will be used to determine an acceptable time period for releaseof mitigationflowsto thestreams, 2. 7..daylow flow statisti_ wiltbe used to comparepro-and post-projectflows forpurposesof determiningpotential impact. 7-day low flow is typicallyused for similar applications(eg: industrialwastewaterdischa_'qe,basinplanning,waterresource planning). 7-day low flow is the criteriathatEcologyusesto determinemaximumimpact on receivingwaters, 3. To evaluate the…

Open full document

Upcoming Events

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 [...]