REQUEST FOR BIDS
The City of Waupaca is requesting sealed bids for mechanical construction service
for REHABILITATION OF SLUDGE TRANSFER TANKS #1 & #2. Bids must be
submitted in a sealed envelope clearly labeled “REHABILITATION OF SLUDGE
TRANSFER TANKS #1 & #2”. These sealed bids must be delivered to the office of
the City Clerk, 111 S. Main Street, Waupaca, WI 54981, no later than 2:00 P.M. on
Friday, July 26, 2019. The public opening of these sealed bids will be held at that
time. Include return address on sealed envelope. Bids shall be submitted on the
included City of Waupaca bid forms only.
PROJECT BACKGROUND
The City of Waupaca Wastewater Treatment Facility is located at 325 S. Oborn
Street in the City of Waupaca. The 8000 building tank to be rehabilitated is a fixed
concrete cover digester, which is utilized for sludge transfer, primarily to hold and
transfer FOG waste. The tank is rectangular in shape with two separate square
shaped truncated pyramid hoppers. Internal dimensions of the tank are 17 feet
wide and 34 feet long, with 12 feet side water depth from the cover to the top of
hoppers. The truncated pyramid shaped hoppers are 7 feet deep. Total volume of
tank including the hoppers is 8,280 cubic feet. The tank walls are 18” thick
composed of 12” thick concrete, 2” thick cork insulation, and 4” thick face brick. The
tank roof is a fixed concrete cover that has a 4’ diameter Envirex/P.F.T gas collection
dome centered over the southern half of the tank and a 24” Varec Fig. 220 access
hatch centered over the northern half of the tank. The tank is enclosed within a
brick building.
The physical condition of the concrete tank is acceptable. The internal sludge and
gas piping has corroded and needs replacement. The concrete cover is in acceptable
condition but existing cold joint cracks needs to be repaired and sealed along with
cold joints at gas dome and access cover.
Work shall be completed to allow for sludge tank utilization by October 15, 2019.
Plant drawings are included within this packet.
Bids Due: July 26, 2019 (2:00 PM)
Contract Award: August 6, 2019 (6:00 PM)