Appendix_E_Wheatley_Reservoir_Bathy_Contours_NAVD88.pdf

This appendix document provides bathymetric contour mapping for the Wheatley Reservoir dredging project managed by Charles County, Maryland. The file contains detailed elevation contours referenced to the North American Vertical Datum of 1988 (NAVD88), which establish baseline conditions of the reservoir bed and are essential for quantifying sediment accumulation and planning dredging operations. The bathymetric survey data, collected in late 2024, identified significant sediment accumulation in the northern and eastern areas of the reservoir, which have been designated as the focus areas for the initial dredging event. Sealed bids from qualified dredging firms are being solicited to provide wet dredging, hauling, and sediment disposal or beneficial reuse services within the defined areas. The project site is located at Gilbert Run Park, 13140 Charles Street, Charlotte Hall, Maryland 20622, and bidders are encouraged to review all project documents and conduct site visits during normal business hours prior to submitting proposals. Charles County reserves the right to request post-dredging bathymetric surveys to document changes in reservoir elevation following completion of dredging activities, with the total sediment volume to be dredged dependent upon contractor cost proposals per cubic yard and other associated project factors.

The dredging scope is constrained by the location of the work within a public park, requiring that dredging activities be scheduled to accommodate park accessibility and recreational activities. No specific contract award value, budget range, or pricing structure is disclosed within this bathymetric appendix document. Funding sources and contract award timelines are not specified in this technical exhibit. The document serves as a supporting reference to enable qualified contractors to develop accurate cost estimates and project schedules based on the precise volumetric and elevation data presented in the contour mapping.