City of Yakima (City) Project 2561 maintains required treatment capacity by providing for the dredging, screening, dewatering, and beneficial use of approximately 2,000 tons of biosolids from a process unit at the Wastewater Treatment Plant.
Biosolids are routinely dewatered at the wastewater treatment plant to reduce biosolids volume and weight for economical hauling to a licensed beneficial use facility. The water (centrate) removed from the biosolids is detained in a lined lagoon prior to being metered back into the plant for treatment. The lagoon, last cleaned in 2009, requires dredging at approximately 12-year intervals to maintain adequate lagoon capacity by removing residual biosolids that have settled from the centrate. The Wastewater Division requires the services of a qualified contractor to perform the lagoon dredging and handling of the biosolids removed from the lagoon.
The City utilized the procedure established by the State of Washington for competitively bidding projects. Three contractors submitted bids, with Merrell Bros., Inc. submitting the lowest bid of $1,362,650.00. The final bid tabulation and contract are attached for City Council review. The project is funded by Wastewater Capital Fund 478. |