Laserfiche WebLink
<br />City of Elk River <br />Northeast Development Area Optimization Proposal <br />Page 6 of 8 <br /> <br /> <br />ii. Existing water distribution system highlighted infrastructure (wells, <br />treatment plants, storage facilities, booster stations, PRV stations, etc.), <br />pressure zones, and the development areas to be studied. <br />iii. Figure showing the limits of the planned developments and the proposed <br />land use for the development areas that will be used to estimate sanitary <br />sewer flows and water demands. <br />iv. Figure of the existing sanitary sewer trunk system showing residual <br />capacity in percentage and flow for ultimate development conditions. <br />v. Three (3) figures, one for each proposed utility alignment (two (2) sanitary <br />alignments and one (1) for the water system) to serve the development <br />areas. <br /> <br />Assumptions <br /> <br />The proposed scope of services includes the following assumptions: <br /> <br />1. City staff will provide the data request items in a timely manner. <br />2. A review of recent studies is limited to the City’s most recent Comprehensive Plan adopted <br />in 2021 and the Northeast & Northwest Urban Service Area Expansion Study completed <br />in 2023. <br />3. City staff will perform draw down test(s) with guidance from AE2S staff. A drawdown test <br />form will be provided for City staff to utilize. <br />4. Metropolitan Council Environmental Services Flow Variation Factors for Sewer Design <br />and/or Ten States Standards shall be used for planning purposes to calculate sanitary <br />sewer peak hourly flows. <br />5. A capacity analysis of the WWTF is not included in this scope. <br />6. Most of the data needed for the development of the sanitary sewer system model <br />including pipe diameters, invert elevations, trunk alignments, etc. is available in GIS <br />format. A detailed review of sanitary sewer as-builts to identify pipe diameters, invert <br />elevations, etc. is not included in this scope and fee. However, it is anticipated that as- <br />builts may be needed to verify some of the GIS data. <br />7. Completing sanitary sewer flow monitoring is not included in this scope and fee as it is <br />anticipated that lift station flow data will be sufficient for the study. If needed, flow <br />monitoring could be completed for an additional fee. If needed, it would be <br />recommended to complete sanitary sewer flow monitoring in the spring of 2025 to <br />evaluate the impact of infiltration/inflow (I/I) in the existing sanitary sewer infrastructure. <br />8. Sanitary sewer model will be developed using AquaTwin Sewer software. <br />Page 105 of 204