UOSA Presentation 18x24 20081017uosa.org/Graphics/UOSA Presentation 18x24-REV.pdf · Wetland\rareas...
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Transcript of UOSA Presentation 18x24 20081017uosa.org/Graphics/UOSA Presentation 18x24-REV.pdf · Wetland\rareas...
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The existing sanitary sewer is within permanent UOSA sanitary sewer easements of 20 or 25 feet in width. Initially UOSA had requested Project Limits of Disturbance (LOD) of 100 feet in width to allow for construction activities. The temporary expansion of the easements to 100 feet was estimated as impacting approximately 35+ acres of parkland outside of the existing permanent easements. After working in conjunction with the Park Authority, UOSA has revised the LOD width to primarily 80 feet which would impact approximately 16 + acres of parkland outside of the existing permanent easements. Additional temporary construction easement areas may also be requested by UOSA allowing for additional construction entrances and materials and equipment staging areas.
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The Park Authority and UOSA understand the magnitude of this proposed impact on the natural resources and are coordinating closely to ensure a restoration plan is included to mitigate construction impacts on these resources. Critical elements of the restoration plan include restoring existing unforested areas to a meadow condition and replanting existing forested areas at a planting density of 400+ tree and shrub stems per acre with native species.
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A majority of the area within the requested temporary construction easement contains significant natural resources. This is a heavily wooded area with mature plant communities and relatively low levels of invasive plants. Cub Run is the largest non-tidal wetland complex in Fairfax County (with the probable exception of Huntley Meadows). This large floodplain complex contains many unusual plant communities and animal habitats. These ecosystems are fragile and the Park Authority must ensure that this project is conducted to the highest standards to prevent degradation of these communities and habitats.
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Most of the area is within the floodplain and associated Resource Protection Area (RPA) for Cub Run and/or Flatlick Branch. Wetland areas and vernal pools are also located within and/or adjacent to the proposed construction site. Seven stream crossings are proposed all requiring temporary damning or stream inversion; five across Cub Run, one across a Cub Run tributary stream and one across Flatlick Branch.
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Construction may impact areas of cultural significance. UOSA has done a Phase I study and has determined that no areas of significance are within the Projects Limits of Disturbance (LOD). The Park Authority is coordinating with UOSA to allow for Park Authority inspection of the construction site throughout construction to determine if unknown sites are disturbed.
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Construction will disturb approximately 1.85 miles of asphalt trail. The associated trail closures will have a larger impact than just the sections within the LOD, as the trail within and adjacent to the proposed LOD serves as a major north-south spine trail.
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