Mitigation Site

US Naval Academy

US Naval Academy Mitigation SitePrinceton Hydro, LLC was subcontracted by the Louis Berger Group to conduct invasive species for three sites located within the boundaries of the United States Naval Academy in Annapolis, MD. The sites included the 12.2-acre Greenbury Point NAAA Mitigation Area and two smaller sites totaling 5 acres.

There was a wide variety of targeted vegetation with varying densities scattered throughout the entire 12.2-acre mitigation area. Due to the large amount of desirable plants, Princeton Hydro’s control approach utilized backpack sprayers with a triclopyr and surfactant solution and a glyphosate surfactant solution. The herbicide application was conducted during October 2009 over a three day period. It was a very time-intensive operation since great care was taken to avoid herbicide spray drift onto non-target vegetation. During the herbicide application, Princeton Hydro applicators removed much of the Oriental bittersweet vines from the trees and shrubs throughout the site.

A follow up site visit was conducted later that month to assess the effect of the herbicide on the targeted plant species and assess any non-target damage. A walkthrough of the entire site revealed that the herbicide application was very effective and a vast majority of the targeted plant species were showing advanced signs of die-off.

The two smaller sites within the Naval Academy boundaries were targeted for the control of common reed (Phragmites). The reed stands exceeded 12-15 feet in height and required the herbicide application to be conducted using Princeton Hydro’s Marshmaster amphibious track vehicle equipped with a 55 gallon motorized tank sprayer. The smaller stands of common reed and areas close to desirable plant species were sprayed with a backpack sprayer to avoid any risk of non-target herbicide damage. The herbicide applied was a glyphosate surfactant solution. The smallest site was located at the edge of small cove where Princeton Hydro was required to maneuver the Marshmaster machine across a 1,000 foot stretch of the Chesapeake Bay. The common reed spraying for both sites was conducted during single day.

Princeton Hydro, LLC was contracted to conduct additional invasive species control for the above sites during the spring and fall of 2010. The spring application was conducted to further control the invasive species in one area and was very effective in controlling all targeted invasive species. A spot treatment application was conducted to control any remaining invasive species. The fall application included an additional ten acres of common reed. While the fall 2009 herbicide applications in Areas 2 and 3 were very effective in controlling the common reed growth, a secondary application was conducted in both areas to control any remaining growth. The secondary application will be followed up in the winter of 2010 with the rolling and crushing of the reed stalks using Princeton Hydro’s Marshmaster vehicle equipped with a steel lawn roller. The 2010 herbicide applications followed the same strategy and herbicides.