EXH0139018047

for the period July 1, 1998 through June 30, 1999 _ Port of Seattle September 1999 L...,_-,._ ;_'t, .-.,,7-_.-.. ,.-:._.2._;,.qr AR 018047 "I Table of Contents -- 1 Executive Summary .................................................................................................................. 1 Introduction............................................................................................................................... 3 Background ............................................................................................................................... 5 3.1 Sea-Tac Intamational Airport ............................................................................................ 5 3.2 STIA Storm Drainage Subbasins ...................................................................................... 5 3.3 Sampling locations ............................................................................................................ 6 3.4 Storm sampling procedures and analytes ......................................................................... 7 Sampling Results.................................................................................................................... 13 4.1 General ............................................................................................................................ 13 4.2 Method of Data Presentation and Comparisons .............................................................. 13 4.3 Storm events sampled ......_.............................................................................................. 15 4.4 Grab Sample Results ..................................................................................................... 16 4.4.1 Total Pelmleum Hydrocarbons (TPH) ............................... ....................................... 16 4.42. Fecal Co.forms .................................................................................................... .... 18 4.5 Composite Sample Results ............................................................................................. 19 4.5.1 Suspended Solids and Turbidity .............................................................................. 19 4.5.2 Biochemical Oxygen Demand (BODs) ..................................................................... 21 4.5.3 Metals ............................................................................................................ :.......... 22 4.6 Deicing Event Samples .................................... _.............................................................. 26 4.6.1 Background.............................................................................................................. 26 4.6.2 Results .. ................................................................................................................... 27 4.7 Other Results............... i ................................................................................................... 29 4.7.1 WET samples ........................................................................................................... 29 4.7.2 Non-representative composites ............................................................................... 31 4.7.3 Field Quality Control Samples .................................................................................. 31 4.7.4 Metals Dudng Ground Deicing Event Runoff ........................................................... 31 4.7.5 Source Tracing Studies ............................................................................................ 34 4.8 Accomplishments ............................................................................................................ 37 4.9 Ouffall Inspeclions .............................................................. i............................................. 37 Conclusions ............................................................................................................................ 39 References ..................................................................................................................................... 41 Appendices .................................................................................................................................... 43 Appendix A Storm Event Hydrologic and Hydraulic Data ............................................................. 45 Appendix B Tabular NPDES Sample Data Summaries ................................................................ 56 Appendix C Tabular Deicing Event Sample Data Summaries ...................................................... 93 Appendix D Whole Effluent Toxicity Sample Data Summaries .................................................. 107 AR 018048 AppendixE OtherSampleData..................................................................................................111 J AppendixF SourceTracingSampleData Summaries...............................................................116 AppendixG…

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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 [...]