Landscape Contractor / Design Build Maintain

MAR 2017

LC/DBM provides landscape contractors with Educational, Imaginative and Practical information about their business, their employees, their machines and their projects.

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Porous Pave Permeable Downtown Commons By David Aquilina, Strategic Storyteller PHOTOS: POROUS PAVE Above, Left & Right Completed in 2016, the Downtown Commons in Minneapolis, Minn., is a 4.2-acre public park adjacent to U.S. Bank Stadium, the new home of the NFL's Min- nesota Vikings. In July and August of that year, 22,000 square feet of Porous Pave permeable paving material was installed to complete the landscaping. A total of 19,000 square feet of Porous Pave XL was poured to form seven areas of perme- able pavement. In addition, 3,000 square feet of Porous Pave XLS created 129 per- meable tree surrounds. T The Downtown Commons sits next to U.S. Bank Stadium, the new home of the NFL's Min - nesota Vikings. Game day and community events are held on its "Great Lawn," a large oval grass field that serves as an open public space. The larger eastern block also has a stage area for performances. The smaller western block is more intimate and tranquil, and features a rolling landscape and more trees, benches and tables. Peterson Companies, Chisago City, Minn., was the landscape contractor for the Commons, and Blackstone Contractors, LLC, Corcoran, Minn., was hired as a subcontractor to install Porous Pave's XL and XLS products. The XL (50 percent aggregate and 50 percent fine-cut, 1/8-1/4 inch recycled rubber chips in the tan color) was installed at a depth of two inches atop a 2" aggregate base for the paved per - meable areas. The workers applied two inches of XLS directly over the soil of the tree wells. The installation of the permeable pavement and tree surrounds was one of the last steps in the landscaping process. Before constructing each of the seven sections of permeable pavement, the crew measured the base of each tree, drove in metal stakes to define the circumference of the tree wells, and affixed heavy-duty cardboard around the stakes to estab - lish and protect the areas for the tree surrounds. The workers put down a two-inch base of com - pacted aggregate in the sections to be paved and covered the edges of bordering sidewalks with plastic sheeting. The recycled rubber chips and the dry, clean, chipped granite aggregate for the XL come in pre- measured bags. The binder is in five-gallon pails. In a portable mortar mixer, the installers mixed the rubber and aggregate chips with the binder in the proportion specified by the manufacturer. Workers wore gloves and were careful to pro - tect adjacent surfaces from the binder, which is very sticky and begins to set up quickly. They dumped mixed batches of the XL into wheelbarrows, spread the material with con - crete come-along rakes, screed it with oil-coated boards in a back and forth motion to achieve a depth of two inches, guided by two-inch measur - ing screed boards. They finished the corners and rolled the edges with trowels, and then smoothed the surface with well-oiled bull floats. Paving Right Using a pres- sured hand sprayer as well as soaked rags, the workers coated all tools and equipment with vegetable oil and periodically reapplied it to keep the mate- rial from sticking and hardening. 46 LC DBM

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