Gulf Power installed four electrical power distribution subaqueous cables across the Sound as an upgrade and replacement to existing cables. Kleinfelder provided horizontal directional drilling (HDD) design support and assisted the client with avoiding impacts to sensitive environmental resources and streamlining permitting.
Kleinfelder designed a combination of drilling methods to install the cables. Boring 1,000 ft. under existing seagrass and pushing HDD pipe from landside in one direction mitigated environmental impacts. Cofferdams that could withstand wave and wind energy were designed within the Sound as workspaces to dig down to the pipe and install the cable. To tie in the cable, drilling to the pipe was performed from a barge. Conventional jet plow was utilized from the intersection to cross the center of the Sound. All work was completed under an ACOE Nationwide Permit and FDEP General Permit.