ADDENDUM NO. |
Nashua WWTIF — Water Valve and Yard Hydrant insisilation
£7B1094-050817
April 2017
All bidders must acknowledge receipt of this Addendum No. 1 by signing it and including with
the bid or stating “acknowledge Addendum 1” directly on the bid sheet. Bids submitted without
acknowledgement of receipt of this addendum may be considered non-responsive.
The following information and changes are now part of the Contract Documents.
DRAWING
1 Remove “New 3” Valve (Contractor to verify pipe size) for the valve into the primary
tanks. Add at two locations on north wall of primary clarifiers “Replace 2” Copper Plant
Water Valve in Pipe Gallery” (see revised drawing).
Note: the pipe gallery is a below grade concrete vault that runs the length of the north
face of the primary clarifiers with stairway entrances at both ends. It houses pumps,
pipes, controls and valves. There is plenty of work space and lighting available to work.
The existing copper (or brass) valves are 2-inch gate type that tee into the existing 2”
copper pipe with solder weld. The new valves will be 2-inch ball type (brass) valves to
be soldered to existing copper pipe.
Add “New 6” Valve “ to the 6” DI line just north of the Aeration Tanks (see revised
drawing).
3. Add electric and instrumentation control boxes that are visible and adjacent to new valve
and hydrant installation at 3 locations — hydrants 4, 5 and 14 (2 on the west face of
primary clarifiers and one at sodium hypochlorite storage tanks.
4, Add note “Cut 7’x7’ section of concrete slab & restore after installation of new valve &
hydrant” at hydrant no. 14 location of sodium hypochlorite storage tanks.
5. Add note “Remove riprap & restore after installation of new valve and hydrant” at hydrant
no. 17.
6. Eliminate note “Pipe freeze to replace valve & hydrant” at hydrant no. 19”. One of the
shut off valves will likely be used instead of the need to pipe freeze.
7. Add note “Existing plant water enters building 8’ below grade” at the location of the
inserta valve to be installed near the entrance to the Sludge Processing and Dewatering
tu
