Eastern Connecticut Conservation District and Willimantic Whitewater Partnership are seeking engineering design plans, permitting and construction oversight for the modification of the Bridge Street Dam. The consultant shall provide detail on their approach, all deliverables (including the specific format of all deliverables) and itemized costs associated with the following 7 tasks. This outline scope is not intended to be a complete list of requirements; the engineer is expected to propose a scope of work sufficient to complete the final design and permitting, such that the Bridge Street dam can be successfully modified. WWP welcomes innovative, cost-effective methods as long as they maintain a focus on the successful completion of this project. Design-build approaches will be considered and can be submitted as a separate optional approach. Design-build fee estimates for construction should list assumptions such that it can be revised if needed depending on the final regulatory approved engineering design plans. 1. Project Management The consultant will propose an adequate amount of time to keep ECCD, WWP and its project partners up-to-date on the project’s progress at all times, and integrate the project partner team into the design decision-making process in a meaningful way. As part of the project management for this project the consultant should include regular progress telephone updates, a project kick-off meeting and one additional meeting that can be used as needed throughout the duration of the project to ensure transparent communications with the project partners. Design review and permitting meetings are included under the appropriate tasks below. This task includes all coordination between WWP, project partners, regulatory agencies, the town and stakeholders as needed to ensure the successful completion of this project. ECCD and WWP, along with its project partners, will take a lead role in public outreach; however, the consultant will be required to support the public outreach component of this project by providing graphic material from the design process and support data as needed. ECCD and WWP will also be responsible for any access coordination or agreements needed. 2. Additional Data Collection Collect and analyze any additional field and other data, available data and resource information on file with local, state and federal agencies and other sources that are necessary to advance the design to the 100% level and proceed to construction. The proposal must identify each data parameter needed, an approach and cost for obtaining that data, and a discrete deliverable. At minimum it is anticipated that this data will include the location of critical infrastructure, delineation of regulated resources (i.e. state and ACOE wetland delineation), delineation of approximate property boundaries as per the local tax assessor data, identification of the potential presence of a threatened and endangered species listed on the state NDDB, investigations of the river left downstream stone retaining wall to determine if geotechnical stabilization is required, and additional topographic and bathymetric data as needed to prepare the necessary base mapping and engineering design plans. While sediment testing was completed in 2007, additional sediment analysis will be conducted as part of this project. The consultant should include in its scope of work a cost to coordinate with CT DEEP to determine what level of sediment testing is adequate to proceed with the dam removal regulatory process. The consultant should provide a description and fee estimate for collecting and analyzing sediment samples, such that proposals and fee estimates can be easily compared. The consultant shall prepare a sediment management plan discussing the sediment characteristics, quality and quantity, along with any due diligence completed. The sediment management plan shall propose a suitable method for sediment management based on the results of the sediment analysis and discussions with appropriate CT DEEP regulatory staff, as needed for the dam modification design. An Archeological and Historical Assessment Report was prepared during the feasibility phase of this project. The consultant is to submit a project notification form and coordinate with the State Historic Preservation Officer to determine if additional archeological or historical assessment is needed to satisfy the Section 106 requirements. Ensure that all necessary assessments and evaluations have been conducted. This shall include, but is not limited to, conducting assessments and evaluations on the Bridge Street Dam material to determine if it has any hazardous waste as defined by C.G.S. §22a-115(1) or hazardous materials in excess of DEEP standards . This may include, but is not limited to, sediment assessment to address streambed sediment, site visit(s), environmental and historic document review, preliminary survey(s) and property information, and preliminary environmental studies. The environmental studies include but may not be limited to: (i) assessments of wetlands and waterbodies and submission of associated Wetland/Waterbody Identification and Delineation Report; (ii) ecological review; (iii) environmental impact assessment; (iv) National Diversity Database (“NDDB”) consultations and surveys. This Project may constitute a State action subject to the Connecticut Environmental Policy Act, C.G.S. Sec. 22a-1 et seq. (“CEPA”), and that funding for the construction is contingent on a determination by DEEP and/or the Connecticut Office of Policy and Management that the requirements of CEPA have been satisfied. The Contractor shall submit all concept plans relating to this Project to DEEP Water Planning & Management Division for review and determination as to whether it is subject to CEPA. Concept plans shall incorporate any mitigation deemed necessary as a result of such determination. The consultant shall determine what data-collection efforts require the development of Quality Assurance Project Plans (QAPP) and develop QAPPs, as needed. All data gathered and analysis completed as part of this task shall be documented and described in the Engineering Design Memorandum prepared as part of Task 4. 3. Hydrology & Hydraulics The selected consultant shall conduct a hydrologic assessment and HEC-RAS hydraulic analysis to reflect any changes to the dam modification design, and the whitewater features developed by the McLaughlin Whitewater Design Group during the initial feasibility study. Model appropriate flows to assess both fish passage and changes to regulated flooding events as needed to complete the regulatory process for dam modification. The results of the modeling will be documented in the Engineering Design Memorandum included under Task 4.
