Finance Committee - Agenda - 1/5/2022 - P4
Exhibit A. - Scope of Services
Nashua, WWIF - Dry Well Piping and Valve Replacement
Phase I. Preliminary Design
Task A. Initial Planning and Evaluation
1) Hold a project kickoff and brainstorming meeting with the City to review and confirm the overall scope,
approach, and project schedule.
2} Site survey:
a. Perform interior 3-dimensional scanning of the Raw Sewage Pump Station Dry Well and Wet Well
(to the extent possible with the station in operation). This is assumed to be two days’ effort and
will be subcontracted to Matterscan. Deliverables to include access to an electronic 3D virtual site
walk of the photographed facilities as well as a point cloud for CAD drawing development of
existing facilities.
b. Prepare 3-D Revit model of existing dry well and piping system using combination of record
drawings and point cloud from Matterscan.
3) Conduct site visit with the applicable Building Services and other support disciplines {assume
instrumentation and electrical} to support design developmeni efforts.
Task B. Preliminary Design Development
1) Evaluate the design requirements; develop planning level cost estimates; and summarize findings in
technical memoranda (TM) for the following project elements/alternatives:
a. Replacement of interior piping and vaives in kind with separate costs for each of the following
elements:
i. Replace all pump piping: suction (30-inch spool at wet well wall to 20-inch reducing elbow},
discharge (20-inch increaser to 24-inch bend connecting to header}.
ii. Replace all valves (plug valve on suction piping; check valve and plug valve on discharge
piping) in kind.
iii, Replace the 42-inch 90-degree bend with nozzles at Lhe western wall where the header
exits the building.
iv. Replace all remaining piping including the 42-inch header to the 90-degree bend at
western wall where the header exits the building, and including all remaining 90-degree
bends, reducers, and fittings (30-inch magnetic flow meter to remain).
vy. Determine the requirements for installing electrical actuators on the plug valves including
structural, instrumentation and electrical provisions.
vi. Develop a plan for constructing a platform to access plug valves on the discharge.
vii. Develop preliminary design drawings of the proposed replacement header system
identifying any changes from the existing system and illustrating the potential access
platform and electrical actuators.
b, Assess the feasibility and costs of constructing a second redundant discharge header system with
the following elements:
i. Replace all pump piping: suction (30-inch spool at wet well wall to 20-inch reducing elbow),
discharge (20-inch reducer to 24-inch piping splitting to connect to both existing header
and new header system).
ii, Replace all existing valves (plug valve on suction piping; check valve and piug valve on
discharge piping) in kind. Provide additional isolation valves as needed for second
redundant header system.
WRiIGHT-PIERCE ==
Engineering a Better Enviranment i
