ii
m ~~
WOODARD
&CHRRAN
COMMITMENT & INTEGRITY 41 Hulchins Drive T 800.426.4262
DRIVE RESULTS Portland, Maine 04702 T 207.774.2142
www, woodardcurran.com F 207.774.6635
ATTACHMENT No 1
PRELIMININARY DESIGN (DESIGN BASIS)
PUMP STATIONS UPGRADE PROJECT
NASHUA, NH
BACKGROUND
The City of Nashua has thirteen pump stations of different sizes, types and ages. Like many
other cities Nashua decided to review and upgrade all pump stations for reasons including but
not limited to: ensure proper and reliable operation to limit sanitary sewer overflows, address
failing force mains, meet current safety standards, improve ease of maintenance and
accessibility for staff at each station, and take advantage of new technology for the betterment
of the community. In many stations, the pumping and controls equipment is beyond its
expected life. After an RFQ process and interviews, Woodard & Curran was selected to
complete this project to review and upgrade the City's pump stations.
PREVIOUSLY COMPLETED WORK
The first investigation phase of the project was approved by the Board of Public Works in
October 2015 and a multiday investigation took piace with Woodard & Curran engineers and
plant management and staff in November. The summary report for this investigation was
delivered in January 2016 and presented to city management and wastewater treatment plant
staff on March 9, 2016.
The first phase presented the city with singular or multiple upgrade options for each station
based on the investigative work. The city was able to use this information to make decisions
on how to proceed so Woodard & Curran could continue to the next phase of engineering
work. That direction was provided to Woodard & Curran on April 8, 2016.
The following table summarizes the findings of the Pump Stations Upgrades Project Study
Phase and sets the starting point for the preliminary design scope of work.
Table — Study Phase Summary
Buon; : -° 1 Replace |. .NewStation f° New. <2. foe
ie Pw Type’ 4 Generator.j Fiber: 7 Gomwmente
7 Gills x
[anna eetennfenneenc en pen etene dene ree cnc eafe nee cencannnnenedtatnceeneee feeenensn be cenne cana snaenenne
a Grinder or
elle Reree OS. A fasten ela? * [Submersible Pig Jd AMO ee Pons Me
& Maurice x Grinder Pkg Remaing’in Street
Bi | encererenenfecenennenedennnvncerdensescencafennsneannensttondeascnsscesrdcsssssndinccnsnnnernenener sas
as : Submersible or
National x TBD Grinder Pkg
Grinder or
BON eel heme red oRenal fi X | Submersible Pg | TEP | yates cl
i Self Prime or
& | Newon | | submersible Pig | TPP
5 _ Spalding x OBOE hoe, 5. One, on Da x Flow metering ;
” Watson 4 Self Prime Pkg x
