Phytoremediation moves RiverLink one more step towards completion of Karen Cragnolin Park
By Dave Russell
The site of the EDACO junkyard for over 20 years, RiverLink’s Karen Cragnolin Park on Amboy Road in West Asheville has taken one more step towards becoming a part of Asheville’s ever-expanding greenway system. Using a process known as “phytoremediation,” RiverLink has been working to clean the contaminated soil on the site since 2013. After taking soil samples on the last of 26 pockets of contaminated soil earlier this month, RiverLink is pleased to announce the samples were proclaimed within safe limits of contaminants by Pace Analytic Services, the EPA-mandated laboratory testing the site. 25 contaminated “hot spots” had already been cleared by the lab.
In the phytoremediation process, native grasses were infused with a bacteria cultivated from the site that can only survive on the Volatile Organic Compounds, or VOC’s, found in the soil at the old junkyard. A Belgian company associated with the Research Triangle Institute in Raleigh/Durham developed the bacteria using the contaminants in the soil. This bacteria can only live on the VOC’s discovered in the soil and as the bacteria eats away, or “vacuums” the contaminants, the bacterium dies off since its only food source are these VOC’s. RiverLink worked with Dr. Ari Ferro, an expert in phytoremediation, to develop and document the process as it cleaned the contaminated soil. One of the many benefits of using phytoremediation is that the cleanup can occur in-situ, meaning “in place,” without removing and transporting the contaminated soils to another location. This cost-effective “green” technology uses plants to “vacuum” VOC’s from the soil through their roots.
EDACO advertised that it was the only junkyard in the U.S. surrounded by public parks and that you could “buy your parts in the park.” After RiverLink acquired the property in 2006, the non-profit worked with D.H. Griffin Wrecking Company, who donated materials and manpower to recycle an estimated 100,000 tons of concrete that covered the entire site. The 8-foot concrete cap was recycled into asphalt and sold.
The property now faces another round of testing, after which a landscape plan will be developed, moving the site closer to becoming a link in the greenway paralleling Amboy Road and the French Broad River, as well as a good place to cast a line!
Dave Russell is the Volunteer Services Manager at RiverLink, 828-252-8474, Ext. 11, or dave@riverlink.org. To find out more about RiverLink and its many programs championing Western North Carolina waterways, visit http://riverlink.org.