KOOSKIA NATIONAL FISH HATCHERY Recirculation incubation chiller system

Well water make up column Reuse water aeration column Reservoir 1, 000 gal Input well water Recirculation pumps Two stage chiller unit

Controller for the two 7 1/2 hp motors Flow meter

Average cost per month to operate the large chiller and hatchery power is $12, 368. 19 Average cost per month to operate the small chiller and hatchery power is $4, 710. 28 The Difference in cost per month is $7, 657. 91 The large chiller is operated four months of the year by itself and three months in conjunction with the small chiller. The small chiller is operated five months of the year by itself. Cost saving calculated by Avista Power • Monthly energy savings with new system 94, 107 k. W hr/month • Monthly demand savings with new system 129 k. W/month • Monthly energy cost Savings $5, 866/month • Monthly demand cost savings $612/month Based on the Avista cost savings estimations, the new system saves us approximately……. . $29, 330/year

First year of full incubation at Kooskia National Fish Hatchery Total eggs on station 764, 546 Total eyed-eggs on station 729, 476 Percent eye-up 95. 4 Total hatch 716, 077 Percent hatch 93. 66 Advantages • Water is recirculated • Only 10 gallons/min is added into the system at all times • Going to a smaller chiller system has saved us $$$$$ • Ability to control water temperature to the Heath stacks Disadvantages • Having to be more diligent in making sure that chemicals are discharged out of the system • More time consuming for personnel to perform egg treatments • Inability to adjust individual stack temperatures