EXH1287051605

for the period July 1, 1999 through June 30, 2000 September 2000 AR 051605 _,_ PortofSeattle =l i ii Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport for the period July 1, 1999 through June 30, 2000 September 28, 2000 _ Prepared by ScottTobiason Environmental Management Specialist Aviation Environmental Programs Port of Seattle AR 051606 Table of Contents Executive Summary........................................................................................ 1 Introduction..................................................................................................... 3 Background.................................................................................................... 5 3.1 Sea-Tac InternationalAirport.................................................................... 5 3.2 STIA StormDrainage Subbasins.............................................................. 6 3.3 Sampling locations................................................................................... 8 3.4 Storm samplingproceduresand analytes ................................................ 9 SamplingResults.......................................................................................... 15 4.1 General............................................................................................ •...... 15 4.2 Data PresentationMethods.................................................................... 15 4.3 Stormevents sampled............................................................................ 16 4.4 Grab Sample Results ............................................................................. 18 4.4.1 Total Petroleum Hydrocarbons(TPH) .............................................. 19 4.4.2 Fecal Coliforms................................ ................................................. 21 4.5 CompositeSample Results .................................................................... 23 4.5.1 Suspended Solidsand Turbidity....................................................... 23 4.5.2 BiochemicalOxygen Demand (BODs) .............................................. 25 4.5.3 Metals............................................................................................... 27 4.6 DeicingEvent Samples .......................................................................... 33 4.6.1 Background...................................................................................... 33 4.6.2 Results.............................................................................................. 34 4.7 Other Results.......................................................................................... 36 4.7.1 Field Quality ControlSamples .......................................................... 37 4.7.2 WET samples ................................................................................... 37 4.7.3 Source Tracing Studies ................................... ;................................ 38 4.8 Ouffall Inspections.................................................................................. 46 Conclusions.................................................................................................. 49 References................................................................................................... 51 Appendices......................................................................................................... 55 AppendixA Storm Event Hydrologicand HydraulicData .................................. 57 AR 051607 Appendix B Tabular NPDES Sample Data Summaries ..................................... 62 Appendix C Tabular Deicing Event Sample Data Summaries ........................... 88 Appendix D Whole Effluent Toxicity Sample Data Summaries .......................... 98 Appendix E Other Sample Data ...................................................................... 102 Appendix F Source Tracing Sample Data Summaries .................................... 106 Appendix G Outfall Inspection Summary .......................................................... 111 List of Tables Table 10utfall Nomenclature ............................................................................... 7 Table 20ffsite Influences Affecting…

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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 [...]