Exhibit A -
scope of Services
WRIGHT. PIERCE = =
iii. Replace the existing 42-inch 90-bend with nozzles at the western wall where the existing
header exits the building.
iv. Develop a plan for redundant header while maintaining adequate access to existing
facilities including ability to utilize existing bridge crane for pump and piping removal.
v. Assess options for tying the redundant neader into the existing force main. Assess
provisions for future dual force mains either to the existing grit chambers or potential
future replacement grit removal facility.
vi. Determine the requirements for installing electrical actuators on the plug valves including
structural, instrumentation and electrical provisions.
vii. Develop a plan for constructing a platform to access plug valves on the discharge to both
the existing and redundant header systems.
viii. Develop preliminary design level drawings of the proposed redundant header system
identifying any changes from the existing system and illustrating the potential access
platform and electrical actuators.
Wet well modifications, including:
i. Replacing slide gate SLG-O2 to allow for wet well isolation.
ii, Assess the need for miscellaneous concrete repairs in the wet wells (seal cracks,
cementitious overlay, etc.).
iii, Assess replacement requirements for wet well level-monitoring system including
identifying options for redundancy.
Existing force main: Assess options for inspecting and lining (if warranted) the buried 42-inch force
main between the Influent Pump Station and the Grit Tanks.
i. Assess options for inspection as part of subsequent investigations prior to proceeding with
final design or to be conducted during construction when force main is bypassed.
ii. Assess options for lining (if warranted) using cured-in-place piping (CIPP} or spray-on
interior coatings.
Replacement valve options, including:
i. Assess advantages and disadvantages of replacing existing check valves with electrically
actuated motorized valves (plug or cane type}.
ii. Evafuate cost versus benefits of specifying higher quality plug valves with a higher k-factor,
fii, Evaluate using knife valves versus plug valves for replacement of existing plug valves,
Bypass pumping alternatives, including:
i. Assess capacity requirements, duration, and seasonality factors.
ii. Utilizing conventional bypass pumping pit for main pump station to main WWTF.
iii. Utilizing the existing WWFTF pump station with bypass pumping from the feed-well of the
WWETF to the grit chambers.
iv. Utitizing the existing WWFTF pump station with bypass pumping from an isolated chlorine
contact tank to the aeration basin inlet channel.
Conduct a pump system head analysis to assess the impact on pumping capacity of the above-
identified proposed changes to the piping system, including:
i. Redundant header system impacts.
ii. Any valving system changes anticipated to change the k-factor that characterizes head loss
across a particular valve.
iii. Differences in force main diameter if various lining technologies are utilized.
The scope of anticipated improvements for building design disciplines is assumed to be jimited to:
changes in pipe support needs (structural); the potential new valve access platform(s}
ing a Better Envi
