EXH1118041921

2. Summary of test conditionsfor the acute set.ruing-level Ceriodaphnia dubia bioassay .......... 3 3. Summary of bioassay re.suits ...................................................................................................... 4 Pa_ inc. //i Fe.bmary 1999 Water Effe_ Ratio Screen_ Study Draft 1. INTRODUCTION Thisreportsummarizesthepmcedm_ andresultsofbiologicaltesungconductedonsitewaterfrom Seaule-TacomaInternationalAirport(STIA)forthePortofSeattle(PC)S).Thepurposeofthesetestsis toprovidescreening-leveltoxicityinfm-mationm anticipationoffro'realteststhatwillbeusedtosetsite- specificwaterqualitystandardsviaawamreffectratio.Sitewaterconsistedofreceivingwater,ouffall discharge,andamixtm_ofthetwo. AllbiologicaltestingwasconductedbyPammetrix'sEn_tal ToxicologyLaboratoryinKirkland, Washington.AnalyticalchemistrywasprovidedbyAquaticResearchIncorporatedinSeattle, Washington. 2. SAMPLE SOURCE AND HANDUNG SampleswerecollectedaccordingtotheStormWaterQualitySamplingandAnalysisPlan(SAP) datedDecember11,1998.Highlightsoftheseprocedures,aswellasminordeviationsfromthisplan, aredescribedbelow.Pertinentclientandsampling/testinformationissummarizedinTableI. Table 1. Screening-level study: summary information. Ciiemname PertofScstt_ Parametrtx job zmmher 55-2912-01 (61) Date of sampling January14, 1999 To_dcltTtesting r_luirmnm_ls Acu_ m:nzning-_'vel C_eri_ _abia bioassays _m_e location Semlle-Tscoma Inm.maionMAkport Nsme of receiving water Miller Cr_.k Upstrmmmof l.a_ Mlaer Cnmk I)ewmmmm (@ 81 Ave. S.) I.akeItehaOmfalltoMillerCreek WalkerCreek@SR509 Emt Bram:h Des Mokms Creek @ fc_ West Broach Dw Motaa _ near fork STIA_ SDS-3(OO5) CityofSm-TscStormOutfltnmNWPonds Samplescolk___by RanSinmmm,JustinKophs Samples were collected at eight locations (Table I) during a stormevent (as defined in the POS Procedure Manual for Stornnvmer Momtoring) on the morning of 14 January 1999. The antecedent dryperiodpreceding this stormwas 86 hours. Precipitationstarted at 1600 on 13 January and ended at 1600 on 14 January 1999; samples were takenfrom appmxirnamly0700 to 1000 on 14 January. Approximately 1.18 inches of rain fell at STIA during this 24-hour storm. Rainfall intensity Paramar_Inc. ] February1999 Water_ _ Scnnm_ Sn_y Dva_ AR 041923 increased from the beginning of the event throughthe thr_-hour period in which the grabsamples werecollected. Parametrixstaff collected two-liter grab samples at 15-minute intervalsover a three-hourpenod from seven of the eight sampling sites. Field staff approachedsampling locations ca_fully from downstreamto avoid stirringup sediment andcompromising sample integrity. Water level (stage) was measured in…

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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 [...]