Task 1: Data Gathering This task shall include a kickoff meeting with the Project Team and completion of all preliminary investigative work necessary to perform subsequent tasks. This includes, but is not limited to, reviewing existing background information, completing land and bathymetric surveying, collecting and analyzing sediment samples from the impoundments, and desktop review of wetlands and Natural Heritage data as necessary to inform the alternatives analysis, including for upstream wetland impacts related to removal. The land survey shall gather all information necessary to perform the alternatives analysis. Vendors should describe the scope of the land survey in their proposals. At a minimum, the land survey shall consist of 1-foot topographic contours which extend 50 feet beyond the limits of each abutment, and a Class 1 boundary survey within a 100-foot radius of the dam. A full Class 1 Boundary Survey may be completed if deemed necessary at the Vendor’s discretion and included in the Vendor’s proposal. The land survey shall also gather elevations for all existing structures, including, but not limited to, the spillway crest, pipe inverts, and weirs/steps. The bathymetric survey shall gather all information necessary to perform the alternatives analysis. Vendors should describe the scope of the bathymetric survey in their proposals. At a minimum, the bathymetric survey shall extend 75 feet beyond the normal pool waterline from the dam embankment. Vendors to assume that five (5) sediment depth measurements will be necessary. Vendors may propose additional bathymetric data collection deemed necessary for the development of the Hydraulic and Hydrologic Model (Task 2) and overall completion of the alternatives analysis. The selected vendor shall carry out a sediment sampling and testing plan which provides sufficient data to complete subsequent tasks and make informed decisions. RIDEM understands that this may not be feasible without completed land and bathymetric survey, and therefore asks Vendors to assume that six (6) samples will be necessary. The sediment samples shall be analyzed by a certified laboratory to collect all characteristics deemed necessary by the Vendor and shall include testing for potential human exposure and aquatic toxicity risks.
