Exhibit A: Scope of Work — Revised 2/14/2017
I. Prepare Preliminary Design Report for Primary Tank Upgrade
A.
Preliminary workshap. ENGINEER shall attend a preliminary workshop with
OWNER to review the work plan for the upgrade project, and solicit input on a
wide range of issues including chain and flight material, shaft layout, scum
handling and disposal options, and ancillary improvements. Brainstorm on
options, and identify the preferred alternatives for detailed evaluation.
Develop base plans and collect site data. ENGINEER shall develop base plans
for construction documents using existing record drawing information
supplemented by detailed field measurements. This will primarily focus on the
depth and dimensions of the scum well and scum piping. Assume 1 day of field
measurements by ENGINEER with 2-person team.
Prepare and Issue Technical Memorandum (TM)
1. Evaluate design requirements for upgraded chain and flight mechanism
including material options: conventional plastic molded, fiberglass loop
and stainless steel chain. Evaluate options for relocation of drive and
return shafts. Arrange and attend 1 day of field trips with OWNER staff to
other New England WWTFs to see rectangular mechanisms and inspect
chain material options. ENGINEER shall develop draft TM for OWNER
input.
2. Evaluate requirements for new sludge withdrawal system using automated
valves for basins 3, 4, 5 including piping modifications in the Primary
Gallery, sludge well modifications and control system for automated
valves. ENGINEER shall develop draft TM for OWNER input.
3. Evaluate options for new access hatches over sludge wells. ENGINEER
shall develop draft TM for OWNER input.
4, Assess condition of primary pumps with manufacturer’s representative
and determine rehabilitation and/or replacement requirements.
ENGINEER shall develop draft TM for OWNER input.
5. Inspect the odor control fans with manufacturer’s representative and
determine rehabilitation requirements. Inspect grease/mist eliminator, fan
enclosure and carbon vessel with manufacturer’s representative and access
upgrade needs. ENGINEER shall develop draft TM for OWNER input.
Access need for and requirements for winter operation and possible
enclosure of odor control system.
