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To comply with its NPDES permit the Port of Seattle is developing LID BMP guidelines for future development and redevelopment projects at Seattle-Tacoma International Airport. Existing GIS layers, geologic data, and other relevant information were used to identify shallow and deep stormwater infiltration opportunities across a broad landscape. Information sources included GIS data from local municipalities and agencies, surficial quadrangle geologic maps, topographic survey information, and LiDAR elevation data, and subsurface hydrogeologic information from boring logs.

Infiltration feasibility was based on the evaluation of factors that affect infiltration potential and identification of units that represent unique combinations of these factors. GIS layers of each factor were created and the infiltration feasibility was evaluated. Shallow and deep infiltration maps were created highlighting areas with good, moderate, and poor stormwater infiltration feasibilities, and the results are now being incorporated into the Port’s Stormwater Management Manual for Aviation Division Property.

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The Trash Talk presentation will illustrate contemporary and emerging trash tracking and data analysis technology. Providing insight on the strengths and weaknesses of the available tools addressing stormwater, street sweeping, and trash collection methods; the poster can aid in program improvement throughout different jurisdictions. Permittees can take away ideas for how they can incorporate these technologies and evaluate whether trash management is worth a different approach.

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Identifying sources of fecal pollution is important for effective watershed management. The need to more accurately identify where the contamination is coming from and how much bacteria is present has spurred the development of the U.S. Environmental Protection Agency’s (EPA’s) source ID and Digital Polymerase Chain Reaction (PCR) technology. EPA’s patented genetic testing methods developed specifically to detect human, cattle, chicken, and dog fecal pollution have undergone rigorous review and been proven to be more sensitive and more accurate. The upcoming EPA standard for microbial source tracking (MST) will enable watershed managers to use genetic-based methods for broader applications. It also will increase the credibility of MST as a useful source of information in assessing potential sources of fecal contamination and possible public health risks. Digital PCR is an advanced technology that provides absolute quantification of the target DNA, allowing water managers to know the source of fecal pollution as well as exactly how much fecal bacteria is in the water. It also improves sensitivity, allowing watershed managers to find the fecal source even if it has been some time since the pollution event, and creates the possibility of direct pathogen detection.

The Bioretention Hydrologic Performance Study was funded by Stormwater Action Monitoring and is evaluating the actual hydrologic performance of ten bioretention facilities across the Puget Sound region. The study is ongoing and this poster will provide an overview of the study design and methods and a discussion of the hydrologic and hydrogeologic/geotechnical evaluations of a few of the bioretention facilities based on preliminary results from data collected in the fall of 2016.

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