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connection work, and will not require that work be redone in the future. The materials and
equipment included in this scope will be compatible to the whole system upgrades and will
have continued value in the future.
PRELIMINARY DESIGN ~ DETAILED SCOPE OF SERVICES
The preliminary design project includes the following general components as described below in detail:
e Field Investigation
« Preliminary Design
« Permit Scoping
* Cost Estimate
e Design Basis Report
Pump Station Fiber Connection
Field Investigation
Field investigation work will be undertaken by subconsultants under contract with Woodard & Curran.
Survey work wil include boundary, topographic, underground utility, and wetland survey of each
existing station location, each proposed site for pump station relocation (Marshall and National}, and for
each proposed gravity sewer location associated with pump station removal (Spalding and Harris).
Geotechnical exploration during this phase wil! only include the Northgate forcemain replacement area.
Two borings will be completed within the river, and two will be completed outside of the river to obtain
information on depth to an impenetrable layer. All other geotechnical investigation work as required for
consideration in final pump station, gravity sewer, or forcamain design will be completed as part of a
future phase.
Preliminary Design
The preliminary (30%) design will include the finalization of pump sizing, communications upgrades,
and station type for station upgrades. Consideration will be made for package pump station systems
with grinder, submersible, and seif-prime pumps as well as custom and building options. Design of any
new buildings will include building layout and exterior design. A request has been made for preliminary
renderings to be created for the Marshall and National pump stations. These will be developed early in
the process and provided fo the City for input.
Dasign will include pipe sizing for both forcemain replacements and gravity sewers to replace pump
stations as applicable. Survey information will be utilized to make a final determination on gravity sewer
locations. Preliminary directional drilling installation plans will be developed for the Northgate forcemain
replacement based on the results of the geotechnical investigation.
This phase of the work will also include the preliminary design for the electrical upgrades required at the
Bridge Street pump station. This design will address safely concerns and standby power requirements
at the station.
Permit Scoping
An evaluation of required permits will be completed as part of the preliminary design. The permits will
not be filed at this time, but a list of the requirements for permitting (local, state, and federal) will be
developed. Some of these permits will be dependent on the results of the wetland delineation.
Cost Estimate
An engineer's estimate of probable cost will be developed based on the preliminary design.
City of Nashua (P228730.10) 3 Woodard & Curran
Attachment 1 May 27, 2016
