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City of Everett 01 1100 - 4 <br />2024 WPCF Biosolids Removal UT 3826-2 <br /> <br /> <br />00 1100 - 4 SUMMARY OF WORK <br />damage caused by dredging into the pond bottom clay layer. <br />c. Contractor’s plan for removal shall be submitted and approved prior to <br />the start of the work. <br /> <br />C. Dewatering <br /> <br />1. Equipment <br />a. The Contractor shall provide all labor, equipment, and appurtenances <br />necessary to perform and support the dewatering, managing on site, <br />and transportation of the biosolids. <br />b. The City is not responsible for the performance efficiency of any item <br />of the Contractor’s equipment or equipment system used in this <br />Contract. <br />2. Dewatering Chemicals <br />a. The net weight of dewatering agents to be used for this project shall <br />be submitted to the City’s Project Manager upon delivery to the work <br />site. Costs for dewatering agents shall be incidental to the unit cost <br />per Dry Ton of biosolids treated. <br />3. Operations <br />a. The Contractor shall understand that it is imperative that each load of <br />material must contain at a minimum of 28% TS. Materials with a solids <br />content of less than 28% TS will be too wet to transport. <br />b. Contractor shall determine and implement the best operational <br />procedures for the successful dewatering of the biosolids to the <br />required minimum TS content of 28% TS. <br />c. Upon completion of the work, the Contractor will be responsible for <br />returning the Biosolids Pad staging areas and haul routes along the <br />pad to their original condition at the start of the project. Any damage <br />by the Contractors operations to the Biosolids Pad staging areas and <br />haul routes along the Pad will be the responsibility of the Contractor <br />to repair to the satisfaction of the City’s Project Manager. <br /> <br /> <br />D. Centrate Return and Effects on Wastewater Treatment <br /> <br />1. Contractor shall return Biosolids centrate to the wastewater treatment <br />process stream using the 10-inch centrate return line. This line runs from <br />the Biosolids Pad to the north end of Aeration Cell #1. <br />2. Contractor is responsible for providing equipment to connect with the 10- <br />inch centrate return line. <br />3. Contractor shall monitor and minimize any scum mat, foaming or other <br />effects from dewatering chemical side-streams. Scum mats that form at the <br />Recirculation Pump Station or the Aeration Cells in excess of 100 square <br />feet in surface area shall be the responsibility of Contractor to collect and <br />dispose of in dumpster(s) provided by the City for this purpose. Any costs <br />of controlling, adjusting, or remediating effects of dewatering side-streams <br />shall be incidental to the costs of dredging and dewatering.