EXH0429022631

for the period July 1, 2000 through June 30, 2001 September 2001 AR 022631 ' Portof Seattle ,i |l Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport for the period July 1, 2000 through June 30, 2001 September 2001 Preparedby ScottTobiason Environmental Management Specialist Aviation EnvironmentalPrograms Port of Seattle ,m. I1' -....... AR 022632 Table of Contents Executive Summary .....................................................................................1 Introduction.....................................................................................................5 Background ................................................................................................... 7 3.1 Sea-Tac InternationalAirport ....................................................................7 3.2 STIA Storm DrainageSubbasins..............................................................8 3.3 Sampling locations.................................................................................10 3.4 Storm sampling procedures and analytes ........................................... 12 Sampling Results..........................................................................................17 4.1 General...................................................................................................17 4.2 Data PresentationMethods ....................................................................17 4.3 Storm events sampled............................................................................18 4,4 Grab Sample Results ..............................................................................22 4.4.1 Total Petroleum Hydrocarbons (TPH)...............................................22 4.4.2 FecalColiforms.................................................................................24 4.5 Composite Sample Results ....................................................................27 4.5.1 Suspended Solidsand Turbidity .......................................................28 4.5.2 BiochemicalOxygen Demand (BODs)..............................................30 4.5.3 Metals...............................................................................................32 4.6 Deicing Event Samples ..........................................................................38 4.6.1 Background...................................................................................... 39 4.6.2 Current Results................................................................................40 4,7 Other Results..........................................................................................43 4.7.1 Field Quality Control Samples..........................................................44 4.7.2 Source Tracing Studies ....................................................................44 4.8 Outfall Inspections ..................................................................................50 Conclusions..................................................................................................53 References...................................................................................................55 Appendices.........................................................................................................61 Appendix A Storm Event Hydrologic and HydraulicData ..................................63 Appendix B Tabular NPDES Sample Data Summaries.....................................68 ==" AR 022633 ? Appendix C Tabular Deicing Event Sample Data Summaries......................... 111 Appendix D Other Sample Data .......................................................................133 Appendix E Ouffall InspectionSummary ..........................................................135 List of Tables Table 1 Nomenclature for Outfalls listed in NPDES Permit Condition S2B .......... 9 Table20ffsite Influences AffectingSTIA MonitoringLocations' ........................ 13 Table 3 Analytes, M_.thod_.and Detection Limits................................................14 Table 4 Stormwater Quality Comparatorsa.........................................................20 List of Figures Figure 1 STIA Subbasin Map .............................................................................15 Figure 2 Rainfall Summary.................................................................................21 Figure 3 TPH for current year .............................................................................24 Figure4 Fecal coliforms for…

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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 [...]