On a rainy June day, ECOSS staff put on their best protective gear and headed to Equinox Studios in Georgetown. Why a rainy day? To conduct water quality sampling of rainwater flowing off the roofs and measure the effectiveness of recently installed Green Stormwater Infrastructure (GSI). The Equinox “Industrial Strength” GSI project is a demonstration site to showcase the utility of nature-based systems in removing contaminants from stormwater and in protecting local waterbodies.

ECOSS staff sampling water from the catch basin near Equinox Studios. Photo Credit: Cari Simson / ECOSS.

Pollution in stormwater can originate as air pollution from many sources that falls on buildings and the ground when it rains. Environmental solutions like Grattix boxes and oyster shell barrels are meant to reduce pollution carried by stormwater into nearby water bodies. To put that to the test, ECOSS is measuring changes in turbidity levels, total suspended solids, total and dissolved metals (e.g. zinc and copper), and pH after the installation of GSI at Equinox.

Equinox Studios is located at the corner of 5th Avenue South and South Michigan Street, a high traffic area near the 1st Avenue Bridge, Boeing Field, the Port of Seattle, I-5. Despite the ongoing COVID-19 crisis at the time of this writing, the site hasn’t seen any reduction in vehicle traffic due to an influx of detoured traffic through Georgetown upon closure of the West Seattle Bridge.

Sampling water that’s been filtered through a Grattix box. Photo Credit: Cari Simson / ECOSS.

In June of 2019, ECOSS sampled in four locations from Equinox’s roofs and nearby roadway to obtain a baseline for water quality prior to GSI construction. Returning to the site in 2020, ECOSS sampled water that traveled through roof downspouts before and after Grattix box and oyster-shell cistern installations to measure how these GSI improve water quality. ECOSS also sampled a nearby roadway and catch basin again to investigate the impact of new permeable pavement and asphalt. With the help of ARI labs in Tukwila, who will conduct the lab analyses, ECOSS looks forward to evaluating the effect of Equinox’s GSI installations. Stay tuned for the results!

Learn more about GSI projects at Equinox Studios

Funding for sampling provided by Puget Sound Stewardship and Mitigation fund, a grant making fund created by the Puget Soundkeeper Alliance and administered by the Rose Foundation for Communities and the Environment.

Also of note, a vertical garden has been installed on the exterior of one of the buildings at the Equinox Complex. The vertical garden will add native plants and hearty vines to the block and will be watered through cisterns capturing water from the nearby roof. For more information and to see a video of the recent installation, go here.

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