Nova Scotia Power filed a capital work order application seeking UARB approval for $3,104,448 to refurbish the Carlton Lake Dam on the Tusket Hydro System to meet Canadian Dam Association safety guidelines and DFO fish passage requirements.

M03085 · CI# 28726 - P-128.10 - NSPI WO - HYD - Carlton Lake Dam Refurbishment - $3,104,448

AI summary

Nova Scotia Power Inc submitted CI# 28726 (Approval Sheet dated April 29–30, 2010), requesting UARB approval for a total project estimate of $3,104,448 — a $387,725 (14.3%) increase over the 2010 ACE budget estimate of $2,716,723 — to refurbish the Carlton Lake Dam spillway, stoplog structures, and fish ladder on the Run Of River Hydro Tusket Hydro System (Cost Centre 408).
The variance was driven by expanded scope following detailed engineering completed after the 2010 ACE: increased survey and geotechnical work, additional fish passage ladder scope to meet Department of Fisheries and Oceans (DFO) requirements, and the need for a Portadam temporary cofferdam system (purchased from Portadam Inc., Williamstown NJ at an undisclosed per-linear-foot price) because environmental/fisheries restrictions prevent lowering Carlton Lake until July 15, leaving an extremely short construction window.
The project justification references a 2005 dam safety review and a January 2006 AMEC Dam Safety Review (DSR) that found the 680-ft Carlton structure has insufficient freeboard, and that the concrete spillway and stoplog structures do not meet Canadian Dam Association (CDA) 1999/2007 stability criteria; consulting fees of approximately $153,598 (accounts 028-Environmental and 028-Design) represent the largest single cost line.
In response to DARB Information Request IR-G7, NSPI disclosed that the Tusket hydro system produces an average of 12.45 GWh annually and that a 10-year Dam Safety Capital Works Program exists covering multiple hydro systems province-wide; NSPI withheld the detailed program (Confidential Attachment 1) on the basis that disclosure of specific budgets and plans would advantage potential suppliers and increase costs to customers.
The project schedule targets a June 2010 construction start, October 2011 in-service date, and November 2011 close; capitalized interest (AFUDC) is forecast at $48,691, reflecting the extended construction period.

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What was filed

Documents filed on this day

N-1 Redacted Work Order 4/30/2010 exhibits