Title
Consideration of and action on acceptance on the completion of the Surface Water Treatment Plant Solids Handling Improvement Project and approving final payment and release of retainage.
Body
Summary:
We received four bids at the May 19th bid opening for the Solids Handling Improvement Project, and on June 6, 2020 the project was awarded to CSA Construction based on their bid of $4,453,685.00.
As you recall, The Ardurra Group was hired to prepare the design, engineering plans and specifications for this project that would allow the sludge to be thickened and caught prior to going to the lagoons. This allows the plant to reuse some of the water it loses through backwash water and desludging the clarifiers.
The project entailed the construction of several new facilities at the Surface Water Treatment Plant. Behind the existing holding basin, a sludge thickener was constructed. The sludge produced by the clarifiers is too thin for any of the sludge removal processes without first being thickened. This basin now acts a clarifier where the sludge will be routed there and excess water allowed to decant off the top of the structure and collected for return water. A polymer addition system was also built. When the sludge gets high enough in the thickener, the operator will turn on the pumps to remove the sludge. It will be injected in the line with a polymer and be discharged into a series of dewatering boxes. This allows the sludge to be caught. Water removed from the sludge in this gravity fed dewatering plan will be captured in a lift station where it can be returned to the head of plant either by way of a lagoon or through the holding basin directly. This project also included changes to the holding basin, opening the five chambers to each other, controlled by a valve. This project allows the sludge to be captured prior to going to the lagoons. It will then be removed from the site by being hauled to the landfill.
As stated earlier, the project was awarded in the amount of $4,453,685.00 however, due to a balancing change order, there is a savings of $194,322 with the final construction cost coming in at $4,259,363.00.
This project has now been completed and is ready for Council to accept completion of the project as well as make final payment and release retainage.
Fiscal/Budgetary Impact:
This project was funded out of various Water and Sewer Certificates of Obligation. These bonds included Series 2016 bond fund 509, Series 2017 bond fund 510 and Series 2018 bond fund 511.
Recommended action
Accept completion of the project and approving final payment and release of retainage.