Specifications include, but are not limited to: 1.Semi-Quantitative Risk Assessment A risk analysis is required to be performed by the Grant NOFO. The first scope item to be performed with grant funding will be to complete a comprehensive SQRA performed in compliance with the US Department of Interior Bureau of Reclamation Best Practice on Dam and Levee Safety Risk Analysis (Version 4.1) – Appendix A. Development of a comprehensive dam breach inundation map at pre-flood full pool elevations and at 0.5 and 1.0 foot lower than pre-flood full pool elevations. Preform a SQRA workshop to identify, quantify, and prioritize dam failure modes which will be prioritized with estimated probabilities developed for each mode. Based on the results, an SQRA Risk Report, with risk matrices will be prepared and submitted to DHEC. Upon completion of the project, the SQRA will be included as a standalone appendix in the Springwood Lake Emergency Action Plan. 2.Dam Breach Analysis A dam breach analysis will be completed to confirm the high hazard class of the dam and receive agency approval. The dam breach is anticipated to require detailed analysis of the breach flow path and inundation area for the 100-year, 50% PMF, and 100% PMF under sunny day and storm conditions. A HEC-RAS model of the breach flow path will be created to generate danger reach maps for inclusion in the EAP. A summary of the computations and results will be prepared for the H&H Report. Outputs from the modeling will be used to generate updated danger reach maps, ACER charts, and an updated breach analysis narrative. Graphics will be provided to the County for inclusion in the Emergency Action Plan (EAP). The results, maps, and graphics from the dam breach analysis will be incorporated into the updated Flood Plain Management Plan and the EAP. 3.Permitting The following permits have been identified and will be obtained as part of this project: • US Army Corps of Engineers Wetlands Delineation • US Army Corps of Engineers Jurisdictional Determination • DHEC Water Quality Certification (Section 401) • DHEC Dam Modification Permit • Richland County SWPP/NOI (includes Land Disturbance and NPDES Notification) • SCDOT Encroachment Permit 4.Discipline Specific Scope Tasks Based on observed damages, repairs to Springwood Lake Dam will require a multi-disciplined approach to a comprehensive design. The analysis will fully document the hydrologic and hydraulic models, inputs, and the results as well as including all back-up calculations and the engineer's design notes. H&H design will be used to drive design requirements for spillway sizing, normal pool reservoir water level elevation, and freeboard requirements. The results of the hydrologic and hydraulic analysis will be included in a technical design report for the overall project. 5.Geotechnical Design The Springwood Lake Dam is an earthen embankment dam that has documented occurrences of internal erosion (“piping”), settlement, deep voids (improperly termed “sinkholes” in the ASDSO Report), development in the crest of the dam, and visually observed voids underlying the concrete lined auxiliary spillway channel. Repairs will be designed under the direction of a Professional Engineer licensed in the State of South Carolina, who is experienced in earthen dam design. The following analysis and tasks have been identified to be completed: Seismicity Subsurface Investigation Geotechnical Laboratory Testing Analysis and Design 6.Survey and Utility Coordination Some surveying and utility location has been completed during the preparatory phase of the project. The scope of the services outlined below is to obtain supplemental information to support the H&H design, geotechnical design, repair plan development, and inundation mapping. Surveying to be performed during this phase of the design will be to fill in data gaps and/or obtain additional information as necessary.