Client: Dominion Energy via C2 Environmental Inc.
Approximate Design Cost: $118,202
Project Timeline: Design 2021-present, Construction TBD
Project Manager: Scott C. Blossom, P.E., CFM, LEED AP
Design Engineers: Elisabetta Civiletto, Courtney Samuels
Environmental Scientists: Ryan J. Schopp, Katie Foster, Mimi Hill
The Line 105 Tarboro-Parmele project involves the rebuild of an existing overhead 115kV electric transmission line. This project, located in North Carolina, was split into phases to address complex project constraints associated with the construction access, steep slopes, and existing levee in the project limits. Phase 1 extends from the existing SR-5 to SR-86 in Edgecombe County, and Phase 2 extends from SR-87 to Parmele substation in Pitt County. The existing wood H-frame structures will be replaced with new structures, and the overhead conductor and shield wires will be replaced. New structures that are located in wetlands will result in permanent wetland impacts. A culvert rebuild task was designed to properly manage the stormwater for the substations Tarboro through Parmele. This will increase the overall safety and stability of the substations. As a component of the design process, an existing conditions analysis was completed in conjunction with an environmental inventory to evaluate design parameters and site constraints. This allowed BCE to improve site safety as well as efficiency.
Project Role
BCE assisted the floodplain administrator with outreach and coordinated with clients and County to define requirements for the floodplain study. BCE calculated peak discharges for culvert sizing by measuring various depths along ditches at each culvert. These values were used to find cross sectional areas of each culvert. Utilizing AutoCAD, BCE found the drainage areas for each of the culverts and the maximum concentration time of water flowing through the drainage area. This was used to calculate the volume of water running through the culvert, allowing BCE to properly size each culvert. Additionally, BCE completed a hydrologic and hydraulic data review and floodplain analysis for the pole replacements located in Special Flood Hazard Area (FEMA Floodplain Zone AE), with base flood elevations and floodway encroachment stations determined by detailed methods.
