Incubation/Early Rearing Water Supply Sample Clauses

Incubation/Early Rearing Water Supply. ‌ Recirculating water system(s) are proposed for some incubation and early rearing area(s). Well or treated water would supply head tank(s) in the incubation and early rearing area. Water from the head tanks would supply the incubation trays, starter troughs, and/or incubation jars. In a particular system, the recirculated water would be pumped through a low-head cleaning screen and degassing/aeration columns prior to returning to its dedicated head tank. As needed, the water will also pass through screening, aeration, biofiltration, ultraviolet disinfection, chiller, heat pump, and/or heat exchanger units to ensure water quality and temperature is maintained. These recirculation systems are required to economically adjust water temperature (see 4.3 Adjusted Timing of Release). Tacoma Power proposes that three recirculation systems for late winter steelhead and spring chinook incubation be evaluated prior to installing recirculation systems for fall chinook or coho incubation. Sterilization of the recirculation loop(s) and associated head tanks would occur within the approximately 1 month downtime that occurs between these species. In addition, Tacoma Power proposes that recirculation loop(s) be installed for approximately 45 starter troughs that will be dedicated to providing treated and/or heated water to steelhead. When heating is required, waste heat from the CSH cold room’s refrigeration system and any new chillers is planned to be utilized. The recirculating water systems will be designed to minimize disease. The new systems will also allow for any formalin treatments required. When temperature adjustment of water supply is not required and sufficient well water is available, the systems will allow for terminating recirculation in favor of a first-pass water supply.