SUBJECT/RECOMMENDATION:
Title
Approve Supplemental Work Order 1 to Hazen and Sawyer, of Tampa, Florida for the Marshall Street and Northeast Water Reclamation Facility Digester Covers Evaluation and Repairs Project (21-0022-UT) in the amount of $111,220.00, increasing the work order from $180,000.00 to $291,220.00, and authorize the appropriate officials to execute same.
Body
SUMMARY:
The City utilizes anaerobic digesters at its Northeast (NE) and Marshall Street (MS) Water Reclamation Facilities (WRF’s) that convert organic matter into stabilized biosolids and methane (or biogas). The digesters at MS and NE WRF were releasing small amounts of methane into the atmosphere through suspected leaks in their floating covers. The methane produced by the digester is flammable and when mixed with air, can create explosive conditions.
November 2021, the City Manager approved emergency procurement for engineering and construction services to remediate the issues due to the potential threat to the WRF’s and public safety.
January 2022, City Council approved (via ratify and confirm) a purchase order to Hazen and Sawyer to design the repairs in the amount of $180,000.00. The agenda item noted plans to hire Rowland, Inc., of Pinellas Park, to construct the repairs; however, Engineering would return to Council later for approval once the construction estimate was complete.
September 2022, City Council approved (via ratify and confirm) a purchase order to Rowland, in the amount of $1,909,650.00 to construct the repairs.
The digester repair work is now complete, and the city is placing the digester back into operation. This Supplemental Work Order includes assisting the city in seeding the digester, monitoring, reporting, and preparing a final report. The work is anticipated to last up to 4 additional months.
The NE digester has been stabilized by installing a flame arrestor and will be repaired separately in a future project.
APPROPRIATION CODE AND AMOUNT:
3277327-546900-96664
Funds are available in capital improvement project 327-96664, Water Pollution Control R&R, to fund this contract.