Rehabilitate an existing 1,000,000-gallon, pre-stressed concrete ground storage tank. The diameter of the tank is 100 feet. The sidewall depth is 10 feet. The tank shall only be out of service for a maximum period of 75 consecutive calendar days during the rehabilitation. The work under this contract includes, but is not limited to the following: o Pressure wash and clean the interior and exterior of the existing ground storage tank to allow for inspection by the OWNER and ENGINEER. o Repair the exterior wall of ground storage tank, including:
o Cracks - approximately 200 LF o Repair interior wall of ground storage tank, including:
o Cracks - approximately 200 LF
o Repair existing interior roof dome of ground storage tank, including:
o Cracks - approximately 200 LF
o Spalls - approximately 100 SF E. Miscellaneous work, including:
o Backfill foundation where concrete spalling is exposed.
o Replace roof access hatch hardware.
o Surface prep and re-gel coat dome access hatch.
o Rout cracks and apply repair mortar on precast overflows.
o Replace / repair loose overflow screens & missing vent screens.
o Clean corroded steel ties with wire brush and apply epoxy sealant.
o Replace gaskets at both manways.
o Repair loosely anchored standoff supports at inlet pipe.
o Exterior ladder replacement to meet current OSHA standards. F. Prepare and apply a new coating system to the following items:
o Tank exterior walls and dome concrete/shotcrete.
o Tank interior exposed pipe and fittings.
o Tank interior dome ceiling and 3 feet down the interior wall from the ceiling. G. Clean, fill and disinfect the ground storage tank per AWWA C652.
Additional Pre Bid Meeting Note: Bidders may join the pre-bid meeting via Microsoft Teams (audio only). Toll number: 347-378-4680 Conference ID: 304 960 148# Question End Date 8/15/2023 5:00 PM
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