08-04-25 - City Council Work Session Agenda

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b. Describe effects from project activities on water resources and measures to minimize or mitigate the effects below. iii. Wastewater — For each of the following, describe the sources, quantities, and composition of all sanitary, municipal/domestic, and industrial wastewaters projected or treated at the site. AUAR Guidance: Observe the following points of guidance in an AUAR: • Only domestic wastewater should be considered in an AUAR—industrial wastewater would be coming from industrial uses that are excluded from review through an AUAR process • Wastewater flows should be estimated by land use subareas of the AUAR area; the basis of flow estimates should be explained • The major sewer system features should be shown on a map and the expected flows should be identified • If not explained under Item 6, the expected staging of the sewer system construction should be described • The relationship of the sewer system extension to the RGU's comprehensive sewer plan and (for metro area AUARs) to Metropolitan Council regional systems plans, including MUSA expansions, should be discussed. For non -metro area AUARs, the AUAR must discuss the capacity of the RGU's wastewater treatment system compared to the flows from the AUAR area; any necessary improvements should be described. • If on -site systems will serve part of the AUAR, the guidance in the February 2000 edition of the EAW Guidelines on page 16 regarding item 18b under Residential development should be followed. 1) If the wastewater discharge is to a publicly owned treatment facility, identify any pretreatment measures and the ability of the facility to handle the added water and waste loadings, including any effects on, or required expansion of, municipal wastewater infrastructure. The existing wastewater infrastructure within the study area includes an existing 12-inch diameter polyvinyl chloride (PVC) sanitary sewer along Robinson Drive and 15-inch diameter PVC sanitary sewer along Century Trail. A sewer stub extends to the north from the manhole at the intersection of Robinson Drive and Century Trail with an invert of 879.78. There is a sanitary manhole at the north end of Cardinal Way with an invert of 883.18. The sanitary sewer on Cardinal Way is 10-inch diameter PVC. Inverts are according to record plans for the Century Farms North development. Scenario 1 and 2 The types and amounts of wastewater produced will be typical of residential and commercial uses. The proposed development is expected to generate approximately 502,000 gallons per day (GPD) of wastewater under Scenario 1 and approximately 557,100 GPD under Scenario 2. This volume was estimated using the Metropolitan Council's Sewer Availability Charge (SAC) tool for the following land uses (see Table 8). Lino Lakes Main Street - AUAR 41 July 2025 Page 49 of 617