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Table 4.5 — Projected Wastewater Flow for Northwest Areas (2040 Development Timeframe) <br />Land Use Type Net Developable Average Unit Wastewater Wastewater <br />Acres Flow (gpd/acre) Flow (gpd) <br />Single Family Residential 1,393 Varies�'> 229,074 <br />Mixed Residential 266 625 166,250 <br />Highway Business 41 800 32,800 <br />Public/Semi Public 29 0 0 <br />Open Space/Parks 202 0 0 <br />Total Average Wastewater Flow (gpd) 428,124 <br />Peak Hourly Flow Peaking Factor�2� 3.5 <br />Peak Hourly Flow (gpd) 1,498,434 <br />(2) Average unit wastewater flow for existing Windsor Lift Station dwellings was calculated using 83 gpd/unit. A <br />generation rate ot 1Z4.5 gpd/unit was used tor all remaining single tamily residential areas. <br />(3) Source: Metropolitan Council Environmental Services Flow Variation Factors for Sewer Design. <br />Investigating the serviceability of the ultimate northwest areas is beyond the scope of this study. However, <br />a high level preliminary analysis was completed to assess how the proposed northwest Regional Lift Station <br />(discussed in Sections 4.6 and 4.7 of this report) may change to serve the projected ultimate <br />developments. The planned land uses for the ultimate northwest areas include single family residential, <br />industrial, rural industrial, and highway business, which are projected to generate a significant volume of <br />wastewater. A summary of the projected wastewater flows for these land uses is shown in Table 4.6. The <br />wastewater flows for the northwest study areas summarized in Table 4.6 are only for the developments <br />planned beyond the year 2040. The total projected flow (ultimate flow) of the entire northwest areas can be <br />calculated by adding wastewater flows from Tables 4.5 and 4.6. The northeast study area is not projected <br />to develop beyond the boundary shown in Figure A1 and therefore the 2040 flow projections summarized <br />in Table 4.4 can also be a representation of ultimate development conditions. <br />Table 4.6 — Projected Wastewater Flow for Northwest Areas (Beyond 2040 Development Timeframe) <br />Land Use Type Net Developable Average Unit Wastewater Wastewater <br />Acres Flow (gpd/acre) Flow (gpd) <br />Single Family Residential 196 375 73,500 <br />Industrial 478 800 382,400 <br />Rural Industrial 231 600 138,600 <br />Highway Business 428 800 342,400 <br />Total Average Wastewater Flow (gpd) 936,900 <br />Peak Hourly Flow Peaking Factor�'► 3.2 <br />Peak Hourly Flow (gpd) 2,998,080 <br />(1) Source: Metropolitan Council Environmental Services Flow Variation Factors for Sewer Design. <br />The Elk River wastewater treatment plant's facility plan completed in 2013 projected the city-wide <br />wastewater flows through 2035. These projections were used to design the 2017 plant expansion. The <br />projected city-wide wastewater flows obtained from the facility plan are shown in Table 4.7. <br />Table 4.7 — 2035 City-Wide Projected Wastewater Flows <br />Parameter Value <br />Average Dry Weather Flow 3.98 MGD <br />Average Wet Weather Flow 4.54 MGD <br />Peak Hourly Wet Weather Flow 7.27 MGD <br />MGD — Million Gallons per Day <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 17 <br />