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1 r Table 1-4. Cost of Screens Installed on HPP Trashracks Item Cost ($) Mobilization (5%) 40,000 Fish Screens 420,000 Trash Rake 210,000 Conveyor 120,000 Subtotal 790,000 Unlisted Items (10%) 80,000 Contract Cost 870,000 Contingency (25%) 230,000 Field Cost 1,100,000 The third option would place the fish screens on the discharge side of HPP just downstream of the Buckskin Mountains Tunnel. The fish screens would create a barrier to live fish that have passed HPP and concentrate them into a bypass channel where they will be killed or separated from the flow. Fish will either be comminuted, electrocuted, or pumped with the debris to the desert or to a separator structure. The water from the separator structure would be pumped back into the canal. The separated fish and debris would need to be handled. Screens that could be used at this location in the canal include, (1) vertical wedgewire screens in either a linear or "V" configuration (or multiple "V"), (2) horizontal rotating drum screens, (3) traveling screens, or (4) modular incline screens. Screen opening size has not been determined, but the intent is not to exclude small or passive life forms. Assuming that vertical wedgewire screens were chosen, this option would require installing the screens, baffles, screen cleaners, comminutors or electric barriers, structures to support the screens and comminutors, and a bypass pipe and/or channel. The major cost items and assumptions are included in Table 1-5. Table 1-5. Cost of Screens on the Discharge Side of HPP f 1 t Item Cost ($) Mobilization (5%) 400,000 Fish Screen Structure (Civil) 6,000,000 Fish Screens 800,000 Baffles 700,000 Screen Cleaners 150,000 Grinders 150,000 Subtotal 8,200,000 Unlisted Items (10%) 800,000 Contract Cost 9,000,000 Contingency (25%) 2,000,000 Field Cost 11,000,000 Control Structure Feasibility Evaluation Miller Ecological Consultants, Inc., February 18, 1997 1-32