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M „ Kimley-Horn ►.'i M FI and Associates, Inc. Attachment 1 Work Order Number 17 Addition of 90th Avenue and CR 510 In-Line Wastewater Master Pump Station (North County Elementary School Site) Project Description and Understandine Construction of a new in-line master wastewater pump station near the intersection of CR 510 and 90"' Avenue is necessary to pump wastewater to the North WWTP . This pump station will redirect flows and relieve Chesters Gap area and boost pressure through the existing 12-inch forcemain on CR 510. The station will be dedicated tore-directing flows from Chesters Gap area to the North WWTP and relieve a hydraulic restriction in this area. The project will consist of construction of a new facility similar to the station designed for 64" Avenue and CR 510 under work order #2 . Both of these proposed stations were identified in the 2004 Master Plan prepared by PBS&J. During the design of 64`h Avenue facility it was determined that the 90`h Ave station was more critical in meeting demands and re-directing flows sooner rather than later as described in the Master Plan. Furthermore, as result of the hydraulic analysis for the 64" Avenue station, it was determined that construction of the 64`h Avenue station can be postponed and possibly be eliminated. Minor modifications to the existing stations between 90th and 64"i Avenues which may be necessary as a result of increasing pressures from the in-line pump station will also be included under this work order. The facility (building, pump room, electrical room) has been designed under WO #2, and will consist of a concrete building (CBS) which will house the pumps, electrical gear, instrumentation and telemetry, and generator. The property acquisition for this station is currently under negotiation by the Utility Department' s staff The station will be located at the North County Elementary School site near the intersection of CR 510 and 90°i Avenue, adjacent to Lateral "D" Canal . Carter Associates, Inc. drawing C-2 for the North County Elementary School identifies the location of this pump station . Normal anticipated flows for the pump station are expected to range from 500 gpm to 1500 gpm, which represent diversion of flows from the area through build-out conditions per the 2004 Master Plan prepared by PBS&J. The size of the station will provide space for future VFD ' s to account for the wide range of flows and/or an allowance for multiple pumps in the future. Smaller size pumps (600 gpm) with across the line starters will be designed for now, with space for piping and electrical gear for larger sizes pumps in the future . Modeling scenarios, using IRCU ' s existing sewer system hydraulic model will be evaluated to determine the recommended option and phasing plan. The station will also consist of backup auxiliary power using a diesel driven generator with an automatic transfer switch. Radio telemetry will be included for remote monitoring and control and match IRCU ' s standard. It is assumed that Data Flow system will be specified . C:\Documents and Settings\lbrown\Local Settings\Temporary Internet Files\OLK13F\90th Ave In-line Wastewater Booster Station - rev 3 .doc Page 1