AI-generated summary
· Decision · unknown
NSUARB approved Nova Scotia Power's $3,978,895 capital expenditure for Carlton Lake Dam refurbishment to meet Canadian Dam Association safety guidelines and DFO fish passage requirements.
AI summary
- The Nova Scotia Utility And Review Board approved CI# 28726 on September 8, 2010, authorizing Nova Scotia Power Incorporated to spend $3,978,895 on refurbishment of the Carlton Lake Dam — a 680-foot concrete stoplog structure on the Tusket Hydro System — up from the original 2010 ACE budget estimate of $2,716,723.
- The $1,262,172 cost overrun relative to the ACE estimate was driven by four factors: a larger cofferdam required by environmental/DFO restrictions preventing lake drawdown until July 15 (+$863,660 for items 1–2 combined); expanded fish ladder scope and installation of a Portadam temporary dam structure required by the Department of Environment/DFO (+$272,640); additional survey and geotechnical work (+$19,616); and increased indirect costs including capitalized interest (+$106,256).
- The project scope included raising the embankment dam crest to meet minimum freeboard requirements under the Canadian Dam Association (CDA) 2007 Dam Safety Guidelines, stabilizing the concrete spillway and stoplog structures, and constructing a new fish ladder to satisfy Department of Fisheries and Oceans requirements.
- Engineering design was provided by AMEC Earth and Environmental under a multi-phase contract (Phases 1 through 2C) covering conceptual design, geotechnical investigation, detailed design, and construction support; consulting costs in the final submission totalled $152,632 versus the ACE estimate of $133,016.
- Pricing details in the application were partially redacted by NSPI on confidentiality grounds, including contractor tender unit prices, material costs, and Portadam purchase pricing, with NSPI arguing disclosure would harm its competitive procurement position and ultimately increase costs to ratepayers.
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What was filed
Documents filed on this day
- N-1 Redacted Application 6/28/2010
- N-1(C) Confidential Application 6/28/2010
- 05130 Board Decision Letter 9/8/2010
- 05130 Board Decision Letter 9/8/2010