Stormwater retrofits for treating highway runoff: Echo Lake basin
Presentation Abstract
Bioretention technologies are a popular stormwater treatment tool in the Pacific Northwest; however, some local studies have shown certain priority pollutants in stormwater (mainly nutrients and dissolved copper) may increase in concentration after bioretention treatment, particularly when influent concentrations are relatively low. This study evaluates effectiveness of two different bioretention technologies constructed as part of a stormwater retrofit project that treats highway runoff in Shoreline, Washington: 1) mature bioretention planter boxes containing Ecology’s standard compost/sand mix and 2) a commonly-used proprietary media designed to provide phosphorus treatment. Samples were collected and analyzed over two storm seasons to assess reduction in toxicity to water fleas and concentrations of a wide-range of contaminants, including suspended solids, metals, nutrients, petroleum hydrocarbons, and polychlorinated biphenyls (PCBs). The study adds new information on the performance of mature (>3-year old) bioretention installations and important maintenance considerations.
Session Title
Stormwater Characterization and Management Using a Watershed Approach
Conference Track
SSE3: Fate, Transport, and Toxicity of Chemicals
Conference Name
Salish Sea Ecosystem Conference (2018 : Seattle, Wash.)
Document Type
Event
SSEC Identifier
SSE3-116
Start Date
6-4-2018 11:15 AM
End Date
6-4-2018 11:30 AM
Type of Presentation
Oral
Genre/Form
conference proceedings; presentations (communicative events)
Contributing Repository
Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.
Subjects – Topical (LCSH)
Runoff--Washington (State)--Echo Lake (Shoreline : Lake); Rain gardens--Washington (State)--Echo Lake (Shoreline : Lake); Bioswales--Washington (State)--Echo Lake (Shoreline : Lake); Urban runoff--Washington (State)--Echo Lake (Shoreline : Lake)--Management
Geographic Coverage
Echo Lake (Shoreline, Wash. : Lake)
Rights
This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.
Type
Text
Language
English
Format
application/pdf
Stormwater retrofits for treating highway runoff: Echo Lake basin
Bioretention technologies are a popular stormwater treatment tool in the Pacific Northwest; however, some local studies have shown certain priority pollutants in stormwater (mainly nutrients and dissolved copper) may increase in concentration after bioretention treatment, particularly when influent concentrations are relatively low. This study evaluates effectiveness of two different bioretention technologies constructed as part of a stormwater retrofit project that treats highway runoff in Shoreline, Washington: 1) mature bioretention planter boxes containing Ecology’s standard compost/sand mix and 2) a commonly-used proprietary media designed to provide phosphorus treatment. Samples were collected and analyzed over two storm seasons to assess reduction in toxicity to water fleas and concentrations of a wide-range of contaminants, including suspended solids, metals, nutrients, petroleum hydrocarbons, and polychlorinated biphenyls (PCBs). The study adds new information on the performance of mature (>3-year old) bioretention installations and important maintenance considerations.
