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City presents five-year study showing permeable pavement plugs but removes key pollutants on Sharp Avenue
Summary
City wastewater staff reported results from a five-year effectiveness and durability study on permeable pavement installed on Sharp Avenue, saying the surfaces plugged over time but, after specialized cleaning, showed reductions in phosphorus and some metals; maintenance cost and durability raise questions about wide use on arterial streets.
Trey George, an environmental manager in the city wastewater management department, presented results Wednesday from a five-year study of permeable pavement installed on Sharp Avenue near Gonzaga University.
The study, which the city carried out to meet a stormwater permit requirement and with partial grant funding from the Washington State Department of Ecology, measured pavement condition, infiltration rates and water-quality treatment from 2019 through 2024. A QAPP, or quality assurance project plan, was approved before monitoring began.
City staff installed permeable asphalt in vehicle lanes and porous concrete in bike lanes and parking areas as a pilot and monitored infiltration with ASTM-standard tests, collected stormwater via an underdrain and autosampler, and analyzed pollutants. The pavement…
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