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Princeton Hydro designed, permitted, and provided regulatory support, including an Environmental Assessment and Environmental Baseline Survey, for this non-tidal wetland and stream mitigation project at the Mattawoman Creek Mitigation Site (MCMS) in Pomfret, Charles County, Maryland. The MCMS is the primary site included in the United States Air Force at Joint Base Andrews (JBA) Mitigation Bank, which provides advanced wetland and stream mitigation credits within the Potomac Basin that can be applied to address anticipated mitigation requirements tied to future capital improvement projects at JBA or other Department of Defense facilities.
This project consists of a combination of freshwater wetland creation and restoration; hydraulic & hydrologic enhancement; re-establishment of vegetative composition and structure; and upland forest restoration buffering the wetland components of the bank. This restoration project provides over 40 wetland mitigation credits and 3,700 linear feet of stream restoration on 81 acres of land. Key project components included a stream assessment of Old Womans Run, and an unnamed tributary, to evaluate existing conditions and determine measurable stream functional uplift resulting from the planned restoration.
The analysis included a watershed assessment and evaluated parameters related to the hydrology, hydraulics, geomorphology, water quality, and biology of the stream reach to be restored or relocated. A wetland water budget was developed for the proposed wetland creation and restoration to determine if sufficient water was available to establish or re-establish wetlands on the site. It was used to inform design development, including proposed grading and plant community composition. The establishment and re-establishment of wetlands was accomplished through directed grading, ditch plugging, and stream restoration designed to maximize the retention of surface water, floodplain reconnection, and groundwater inputs.
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