Landscape Architect & Specifier News

JUN 2018

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 from page 14 h a rd s c a p e s 16 Landscape Architect and Specifier News its licensed representatives to be sure the procedure was correctly done and in the best interest of the newly planted trees. All of the newly planted trees are likely to survive the plaza environment and live for a normal lifespan. The plaza/park is the start of the bike and jogging trail that winds along the Bronx River Parkway. The plaza also features "The Rising," Westchester's monument to the county residents who died at the World Trade Center on 9/11. The plaza offers a wide variety of public activities: concerts, fitness classes and picnicking. There's also a renovated playground with safety surfacing, in-line skating, widened walking and nature study trails and opportunities to study nature and the trees. Team List Kensico Dam Plaza Project Landscape Architect: Gibney Design LA, PC, Wading River, N.Y. Richard Gibney, RLA, ISA Brick Watsontown Brick Co., 'Garden Blend' 4"x8" chamfered paving brick CU-Structural Soil ® installation overseen by Cornell University Tree grates Neenah Foundry 4'x4' grates Photos Ken Uhle, RLA, ASLA, Westchester County Department of Parks, Recreation and Conservation. Top, Left: For the new trees to survive the pavement loads, the landscape architect specified excavating 2–3' of soil and replacing it with CU-Structural Soil® (aka CU-Soil). This structural soil was developed at Cornell University to bear pavement loads after compaction and allow root penetration and vigorous tree growth. The loam contained at least 20% clay to maximize water and nutrient holding capacity, and was mixed with 1" dia. crushed stone to create void spaces. A small amount of a hydrogel was added to prevent the soil and stone from separating during the mixing and installation. The proportion of soil to stone was approximately 80% stone to 20% soil by dry weight. This proportion insured that each stone touched another stone, creating a rigid skeleton, with the soil filling the pore spaces between the stones. Bottom, Left: The structured soil was installed in layers and compacted after each layer was added. This continued to the final grade just before a layer of stone dust was applied. After the CU-Soil was installed, the new trees were planted with regular soil immediately around the root balls. The clay brick pavers were set atop the structural soil with no mortar joints to allow water to infiltrate into the structural soil, thus requiring no automatic irrigation system. Right: In addition to reconstructing Kensico Dam Plaza and beautifying the space with extensive landscaping, the $31.4 million project rehabilitated the dam infrastructure, reconstructing portions of the dam, spillway and stone masonry surfaces.

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