A
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WOODARD
& CURRAN
COMMITMENT & INTEGRITY
DRIVE RESULTS
ATTACHMENT NO. 1 EXHIBIT A
FINAL DESIGN
PUMP STATIONS UPGRADE PROJECT
NASHUA, NH
BACKGROUND
The City of Nashua has fourteen 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 investigation phase of the project was approved by the Board of Public Works in October
2015 and a multiday investigation took place with Woodard & Curran engineers and plant
management and staff in November 2015. The summary report for this investigation was
delivered to the City in January 2016 and presented to city management and wastewater
treatment plant staff on March 9, 2016.
The preliminary design phase of the project was approved by the Board of Public Works in July
2016 and a Design Basis Report (DBR) was delivered to the City and presented to city
management and wastewater treatment plant staff on January 19, 2017. The DBR presented
the City with recommended upgrade options and estimates of probable construction cost for
each station based on preliminary engineering analysis of layout, mechanics, hydraulics and
constructability. The city was able to use this information to make decisions on how to proceed
so Woodard & Curran could continue to the final design phase. The City provided Woodard &
Curran with a memorandum dated February 10, 2017 summarizing the City’s design decisions
relative to the recommendations inciuded in the DBR and outlining additional design requests.
Since the City’s February 10, 2017 memorandum, Woodard & Curran has completed additional
preliminary design tasks to evaluate several of the City’s design requests at the Northgate and
Spalding stations. A site visit was conducted on March 30, 2017 with city wastewater
treatment plant staff and structural and electrical engineers from Woodard & Curran. The
purpose of this site visit was to conduct a more extensive condition assessment of the
structural and electrical components of the pump station to verify that the City’s current
upgrade design objectives could be achieved relative to upgrading, as opposed to fully
replacing, the pump station. Site visits were also conducted on April 17, 2017 to Trestle Brook
and Saniere pump stations to perform structural observations and assessments of the wet
wells and dry wells at each station and for the building at Trestle Brook.
On April 13, 2017 a teleconference was conducted including city wastewater staff, the city's
hydraulic modeling consultant Hazen and Sawyer and Woodard & Curran to discuss modeling
results related to the preliminary design to eliminate the Spalding pump station.
