EXH1193045668

for the penod July 1, 1999 through June 30, 2000 September 2000 1193 AR 045668 -_ PortofSeattle 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 EnvironmentalManagementSpecialist AviationEnvironmentalPrograms Portof Seattle AR 045669 Table of Contents Executive Summary........................................................................................ Introduction..................................................................................................... Background.................................................................................................... 3.1 Sea-Tac InternationalAirport.................................................................... 5 3.2 STIA Storm Drainage Subbasins .............................................................. 6 3.3 Sampling locations ................................................................................... 3.4 Storm sampling procedures and analy_es................................................ g Sampling Results.......................................................................................... 15 4.1 General ................................................................................................... 15 4.2 Data Presentation Methods .................................................................... 15 4.3 Storm events sampled ............................................................................ 16 4.4 Grab Sample Results ............................................................................. 18 4.4.1 Total Petroleum Hydrocarbons (TPH) .............................................. 19 4.4.2 Fecal Coliforms................................................................................. 21 4.5 Composite Sample Results .................................................................... 23 4.5.1 Suspended Solids and Turbidity....................................................... 23 4.5.2 Biochemical Oxygen Demand (BODs) ............................................. 25 4.5.3 Metals ............................................................................................... 27 4.6 Deicing Event Samples .......................................................................... 33 4.6.1 Background...................................................................................... 33 4.6.2 Results.............................................................................................. 34 4.7 Other Results.......................................................................................... 36 4.7.1 Field Quality Control Samples .......................................................... 37 4.7.2 WET samples ................................................................................... 37 4.7.3 Source Tracing Studies ................................... :................................ 38 4.6 Outfall Inspections.................................................................................. 46 Conclusions.................................................................................................. 49 References ................................................................................................... 51 Appendices......................................................................................................... 55 Appendix A Storm Event Hydrologic and Hydraulic Data .................................. 57 AR 045670 Appendix B Tabular NPDES Sample Data Summaries ..................................... 62 Appendix C Tabular Deicing Event Sample Data Summaries ........................... 88 Appendix D Whole EffluentToxicitySample Data Summaries .......................... 98 Appendix E Other Sample Data ...................................................................... 102 Appendix F Source Tracing Sample Data Summaries .................................... 106 Appendix G Ouffall Inspection Summary.......................................................... 111 List of Tables Table 10utfall Nomenclature............................................................................... 7 Table…

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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 [...]