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I I I I I I I I I I I I I I I I I I I system pressurized and to meet small demands. The main pumps will be controlled by variable frequency drives (VFD) to provide constant pressure to the system. The pump system will be designed as a pre-fabricated, skid-mounted system including the main pumps, pressure maintenance pumps, variable frequency drives, piping, valves, and electrical controls. Automatic filtration will also be included on the skid, downstream of the pumps. This filter will prevent debris from entering the irrigation systems and help avoid clogging sprinklers or valves. The automatic filtration system will backwash debris from the filter screen. Typically, this water is discharged back into the storage reservoir, away from the intake screen. Each pump station will be composed of several pump "skids" in order to meet the required volume of water being pumped and to allow for incremental phasing as the system grows. Phase I Pump Station The Phase I pump station will be located at Highland NO.3 Reservoir. Output from the hydraulic model requires approximately 32,000 GPM at a discharge pressure of approximately 116 PSI. The total required horsepower is anticipated to be approximately 3,200 HP. Eight pumps, each with 400 HP motors, are proposed for this pump station, Four skids, each capable of 8,000 GPM, would be required to meet the total demand of the secondary supply system at build-out level. Phase II Pump Station The Phase II pump station will be located at the proposed new reservoir near the head of the Erkenbeck Lateral. Output from the hydraulic model requires approximately 28,500 GPM at a discharge pressure of approximately 106 PSI. The total required horsepower is anticipated to be approximately 2,600 HP. Seven pumps, each with 400 HP motors, are proposed for this pump station. Four skids would be required to meet the total demand of the secondary supply system at build-out level from this station with three skids capable of delivering 8,000 GPM and a single skid capable of approximately 4,500 GPM. Pump System Enclosure Each pre-fabricated pump system will be located within a building, installed on a concrete slab. This building could be constructed of precast concrete "tilt-up" walls, concrete masonry unit (CMU) walls, or wood framed walls. The building will include adequate access for maintenance including a roof hatch above the pumps and filters. Proper ventilation will be required to keep the motors cool as well as to heat the exposed piping during shoulder months when freezing conditions may exist. Electrical Requirements Electrical components required at each pump station will include a main service disconnect and meter (as specified by the local electrical utility), transformer, and service panel for the previously mentioned components. The pump station skid will include the Aqua Engineering, Inc, November 8, 2004 Canal Modernization Feasibility Study - 23-