Landscape Architect & Specifier News

MAR 2017

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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Continued on page 14 12 Landscape Architect and Specifier News The first curb-to-curb permeable street in the Bay Area not only provides a safe and beautiful transportation route in the city of Berkeley, but also infiltrates stormwater, filters pollutants, reduces runoff and improves the health of surrounding trees. Driven by scientific analysis, in-depth research and exhaustive planning, a section of Allston Way was transformed from a deteriorated asphalt surface into a 29,000 square-foot environmentally friendly permeable interlocking concrete pavement (PICP) roadway made of 'Eco-Priora' pavers from Pavestone. Before the first pavers could be installed, concerns from city engineers and arborists about the excavation had to be addressed. The project designers, AECOM and Applied Research Associates, Inc., collaborated on a solution that reduced the excavation depth about one foot by placing an 8" layer of high density polyethylene cellular confinement filled with aggregate as part of the subbase. This approach created a healthy coexistence between the new paver surface and the existing underground utilities and trees along the street. In addition, a system of berms and subdrains manages water entering the pavement to maximize infiltration into the subgrade. During the six-month, two-phase project, seven-man crews installed the pavers, which feature an interlocking joint and a micro- chamfered top edge profile that can generate an initial average permeability flow rate of up to 100 inches per hour, according to the manufacturer. Custom yellow and white pavers create a bold contrast with the darker h a rd s c a p e s by Chad Corley, Pavestone Berkeley's First Permeable Street Renews Old Roadway In northern California in 2016, Allston Way became the city of Berkeley's first fully permeable road. The 29,000 square foot street was designed through collaboration between AECOM and Applied Research Associates. The two-phase project took six months to complete.

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