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6. PROJECT SCHEDULE AND PHASING <br />A detailed phasing plan to extend public utilities to the study areas cannot be prepared at this time as the <br />construction schedule of individual developments is unknown. However, a preliminary analysis was <br />completed to identify which infrastructure would need to be constructed prior to any developments to <br />provide utility service. <br />6.1 Northeast Study Area <br />In order to recommend which infrastructure would be needed in the short term, it was assumed that <br />development would begin near the intersection between Cleveland Street NW and Twin Lakes Rd NW. <br />The following infrastructure is anticipated to begin water service: <br />- Trunk Watermain: Extend 12-inch watermain along Twin Lakes Rd NW between 193�d Avenue NW <br />and Cleveland Street NW to finish connecting the existing loop. Continue extending the 12-inch <br />watermain along Twin Lakes Rd NW and Tyler Street NW as development continues. <br />The following infrastructure is anticipated to begin sewer service: <br />- Lift Stations: The Regional Lift Station will be needed to begin sewer service. It is anticipated that <br />an initial firm pumping capacity of 500 to 700 gpm will be needed during the first 5 to 10 years of <br />operation. The lift station's firm pumping capacity can be increased as development progresses. <br />- Forcemains: The 8-inch and 12-inch forcemains associated with the Regional Lift Station will also <br />be needed to begin service along with the air release valve manholes identified for both forcemains. <br />- Trunk Sewermain: It is likely that the full section of 18-inch trunk sewermain will be needed to begin <br />service. Additional trunk sewermain may be needed based on development phasing. <br />- Connection at VWVfP: A new intake structure will be needed at the Elk River WWTP to receive the <br />wastewater pumped by the Regional Lift Station. The cost of the receiving structure is not included <br />in this report. <br />6.2 Northwest Study Area <br />In order to recommend which infrastructure would be needed in the short term, it was assumed that <br />development would begin in the southeast portions of the Northwest study area and extend northwest along <br />the gravel mining site avoiding leapfrog development. <br />The following infrastructure is anticipated to begin water service: <br />- Booster Stations: The BS-2 booster station will be needed to begin water service. A pumping <br />capacity of 400 gpm is considered to be sufficient for this booster station as long as additional <br />supply capacity through wells is provided in the future. <br />- PRVs: The PRV-2 will be needed to recirculate excess water pumped by BS-2 and avoid <br />stagnation. PRV-1 and PRV-3 may also be needed if those existing residents also want water <br />service. <br />- Trunk Watermain: Extend 16-inch watermain along Proctor Road NW and 12-inch watermain along <br />Irving Street NW and 197th Avenue NW to serve development as needed. <br />- Wells: A well may be needed shortly after the initial development phasing to supplement BS-2. <br />However, it is likely this will not be needed to begin water service. Water treatment will likely be <br />needed at this well. <br />- Water Tower: Awater tower is not needed if the initial plans are to only serve single family dwellings <br />located throughout the southeast corner of the area. However, a water tower is recommended to <br />begin service if utilities are being extended to serve mixed residential or highway business land <br />uses. <br />Feasibility Report <br />Northeast & Northwest Urban Service Area Expansion Study <br />City of Elk River, MN <br />WSB Project No. 020010-000 <br />Page 28 <br />