Treatment processes at the City of Yakima Wastewater Treatment Plant (City) generate approximately 8,000 wet tons of biosolids per year. In compliance with the City’s coverage under the Department of Ecology General Biosolids Permit (Permit), the biosolids are treated and verified through laboratory testing to meet all federal and state Class B biosolids standards. The Class B designation qualifies the biosolids for beneficial use including conditional land application. The current Permit and the City’s 2018 Annual Biosolids Report to Ecology, including laboratory testing results, are attached for reference.
The City’s coverage under the Permit does not include biosolids hauling or land application, so the City contracts for these services through the bid process. Qualified bidders must maintain coverage and compliance with the General Biosolids Permit for these functions. Compliance with the Permit’s hauling restrictions include proper load coverage during transport and spill containment/clean-up plans for transportation accidents. Permit restrictions for land application include containment requirements and strict observation of agronomic land application rates, verified through the laboratory testing of soils, to protect groundwater from nutrient infiltration. The Permit also includes land application setback and vegetation buffer requirements for the protection of surface waters. Complete details can be found in the attached Permit.
Yakima Wastewater Treatment Plant has completed the proposal and evaluation process for selecting a contractor to provide Biosolids Hauling and Land Application Services. The Evaluation Committee recommends Natural Selection Farms as the selected contractor. Please see attached Cover Letter / Recommendation of Award / Natural Selection Farms, Inc. General and Site-Specific Land Application Plans. Agreement Exhibits A& B are on file in the Purchasing Office. |