A
Mim ~~,
WOODARD
& CURRAN
a | Presene | Np
& | Santere Self Prime Pkg x .
z City to CCTV and
Trestle TBD Self Prime Pkg {reuse X confirm forcemain
Brook or Extend Bidg existing) material and joint
condition
Northgate x Costa x
By penne een cate cB eae es Be Moet ee ete bese eee en ne
| , Includes only
5 ar) St x electrical necessary
for safety
Notes:
- All stations will have controis upgrades
- All stations not equipped with permanent generators will have portable generator hook ups
- Preference will be given to self prime pumps and station buildings where possible
PROPOSED PRELIMINARY DESIGN
This next phase of work (as presented in the following scope) will be to proceed with
preliminary (30%) design for stations where an upgrade path is obvious and mutually agreed
upon,
Woodard & Curran will use local subconsultants for surveying, and wetland delineation for all
stations, gravity sewer, and forcemain locations. A geotechnical investigation will be
completed for the Northgate forcemain location, and all other geotechnical investigations will
be held until the next phase of work.
Preliminary design and engineering drawings will be developed and presented in design basis
reports for each pump station. Cost estimates and permit evaluations will also be developed
for each site.
Renditions will be completed for two stations (Marshall and National} as requested. For
National, a pump station with historical flooding issues, the City will install a meter and work
with Woodard & Curran to determine design flow rates. We will perform an investigation into
the permitting required including having a wetland scientist involved during the surveying.
The project will include two additional components not initially envisioned in the scope. The
Northgate forcemain break on July 4th weekend was a critical failure in the City’s sewer
system, and this project will now include preliminary design for the replacement of this pipe via
directional drilling This project will include borings in the river to depths of 50’ to understand
where to directional drill to replace the force main.
The benefit of immediate connection of five of the City's pump stations (Spaulding, Marshal,
Fulton, Watson, and Trestle Brook) to the City's extensive fiber optic has also been identified,
and this connection work will be completed as part of this project. The pump station
preliminary design work that will be completed concurrently will be compatible with the
City of Nashua (P228730.10) 2 Woodard & Curran
Attachment 1 May 27, 2016
