EXH1129042872

for the period July 1, 1998 through June 30, 1999 _ Port of Seattle September 1999 1129 AR 042872 Table of Contents Execut_'eSummery..................................................................................................................1 Introduction...............................................................................................................................3 Background...............................................................................................................................5 3.1 Sea-Tac InternationalAirport............................................................................................5 3.2 STIA StormDrainageSubbesins......................................................................................5 3.3 Samplinglocations............................................................................................................6 3.4 Stormsamplingproceduresandarmlytes....................................................................... 7 SamplingResults................................................................................................................. 13 4.1 General.......................................................................................................................... 13 4.2 MethodofData Presentationend Comparisons............................................................. 13 4.3 Stormeventssampled.....................................................................................................15 4.4 GrabSampleResults......................................................................................................16 4.4.1 Total PetroleumHydrocarbons(TPH)...................................................................... 16 4.4.2 FecalColiforms....................................................................................................... 18 4.5 CompositeSampleResults - 19 4.5.1 SuspendedSolidsandTurbidity..............................................................................19 4.5.2 BiochemicalOxygenDemand(BeDs) .................................................................... 21 4.5.3 Metals......................................................................................................................22 4.6 DeicingEventSamples...................................................................................................26 4.6.1 Background............................................................................................................. 26 4.6.2 Results.....................................................................................................................27 4.7 OtherResults..................................................................................................................29 4.7.1 WET samples................................................................................................:.......... 29 4.7.2 Non-represe_-itativecomposites.............................................................................. 31 4.7.3 FieldQualityControlSamples................................................................................. 31 4.7.4 MetalsDuringGroundDeicingEventRunoff........_................................................. 31 4.7.5 SourceTracingStudies.......................................................................................... 34 4.8 Accomplishments............................................................................................................37 4.9 OuffallInspections...........................................................................................................37 Conclusions............................................................................................................................39 References.....................................................................................................................................41 Appendices....................................................................................................................................43 AppendixA StormEventHydrologicand HydraulicData.............................................................45 Appendix B TabularNPDES SampleData Summaries................................................................ 56 AppendixC Tabular DeicingEventSampleData Summaries......................................................93 AppendixD Whole EffluentToxicitySampleData Summaries.................................................. 107 AR 042873 AppendixE Other SampleData................................................................................................ 111 AppendixF SourceTracingSample Data Summaries............................................................... 116 AppendixG OutfallInspectionSummary..................................................................................... 121 List of Tables Table 10utfall Nomenclature.......................................................................................................... 7 Table20ffsita InfluencesinSTIA MonitoringLocations(a)..;......................................................... 8 Table 3 Analytes.Me_ods and Detectionlimit=............................................................................. 9 Table4 StormwatarQualityComparators(a).............................................................................. 14 Table5 Correctionsto TotalRecoverableCopper Data Summaries in Past Reports................... 26 Table 6 WET TestingSummary.................................................................................................... 30 Table 70ulfall MetalsSamplesDuringGroundDeicingEvents................................................... 33 t Table8 InstTeamMetals SamplesDuringGroundDeicingEvents................................................ 33 Table 9 SDS1 Samples(rag/I)....................................................................................................... 36 List of Figures Figure 1 STIA SubbesinMap......................................................................................................... 11 Figure2 TPH for currentyear ....................................................................................................... 17 Figure3 FecalColiformsforCurrant year ................................................................................... 18 Figure4 TSS for CurrentYear ....................................................................................................... 20 Figure5 Turbidityfor CurrentYear ................................................................................................ 20 Figure6 TSS andTurbiditypeak and return for SDS3 .................................................................. 21 Figure7 BOD5forCurrentYear..... .......................................................................................... _.....22 Figure8 Total RecoverableCopperfor CurrentYear.................................................................... 24 Figure9 Total RecoverableLwd'for CurrentYear....................................................................... 25 Figure 10 Total RecoverableZinc for CurrantYear........................... ........_.................................. 25 Figure11Glycolresultsfor CurrentYear ......................................_............................................... 28 Figure12 SDE4 SourceTracing............................................................. ,.....................................…

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