COB 2022-0005 - Mount Beacon Reservoir and Pocket Dam Rehabilitation

ADVERTISEMENT FOR BIDS

Mount Beacon Reservoir and Pocket Dam Rehabilitation
For
City of Beacon, Dutchess County, New York

Sealed bid for BID NO. COB_2022_005 – General Construction will be received by the City of Beacon in City Hall at One Municipal Plaza, Beacon, New York, until Thursday, May 12th at 10am, 2022 and then at said office publicly opened and read aloud. Bids are requested for:

Mount Beacon Reservoir and Pocket Dam Rehabilitation
For
City of Beacon, Dutchess County, New York
BID NO. COB_2022_005 – GENERAL CONSTRUCTION BID NO. COB_2022_005 - GENERAL CONSTRUCTION

For Pocket Dam, the Contractor shall: remove 1-foot of concrete and then raise the non-overflow section to EL. 429.2' and replace the foot of concrete to the spillway. The Contractor will remove the remaining deteriorated concrete from the downstream face, clear debris from the downstream channel and repoint the downstream face of the dam. The Contractor will add (2) electrical conduits into the concrete from the pump house to the new valve platform. The Contractor will add 1.5 feet of concrete to the upstream surface of the entire dam, tying into bedrock. A fall protection system will be installed, and valve operating platform will be replaced by the Contractor. Lastly, the Contractor will raise & replace
the pump house door and remove and replace fencing.

For Mount Beacon Reservoir Dam, the Contractor will remove all shotcrete and loose or deteriorated concrete to/from the downstream face and crest of the dam, spillway, training walls and buttresses down to the base of the entire dam. The Contractor will remove shotcrete along the downstream face and crest of the spillway and from the upstream face down to EL. 1282.0'. The Contractor will remove the south spillway channel wall connecting to the gatehouse and install drainage channels and piping in the downstream face to connect the existing drainage pipes to the new draining system at the toe of the dam. The Contractor will remove the deteriorated buttresses to a depth of 1 foot below existing ground surface and prepare for shotcrete layer along the downstream face. The Contractor will route the piping for the drainage system to run to a new weir box and then through the northern most spillway channel wall before the culvert under the access road.

The Contractor will raise the non-overflow sections to EL. 1288.5', build a new spillway channel wall to the gatehouse, remove and install a new valve platform. The Contractor will install a new handrail protection system, extend the dam 19 feet on the southern end and 22 feet on the northern end, excavate the gatehouse floor and remove the existing downstream 18-inch gate valve. The Contractor will install (2) new pipe saddles, install a new 18-inch butterfly valve with extended bonnet and install a new removable steel platform floor in the gatehouse. A new shotcrete surface layer will be placed on all spillway channel walls and the downstream face of the dam. The Contractor will install a new 8-inch tap on the 18-inch C.I.P. before the gate house and install piping to a 4-foot diameter manhole that will contain a flow meter. The Contractor will then install piping with the discharge passing through the spillway channel wall just north of the gatehouse.