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Attachment A Table 6: Wells Within the Project Site Unique Well IDStatusUse 702842ActiveMonitoring Well 702743SealedMonitoring Well b.Describe effects from projectactivities on water resources and measures to minimize or mitigate the effects below. i.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. 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. Based on the Metropolitan Council’s Sewer Available Charge determination standards for buildings with the proposed uses (see site planin Attachment A), wastewater flows are projected to be approximately 12,480 gallons per day (GPD) for the southern, mixed-use part of the siteand approximately 131,520 GPDfor northern, residential part of the projectsite. Wastewater is expected to be equivalent to domestic strength wastewater. In the event a specific user would have wastewater stronger than domestic strength wastewater, a pretreatment facility would be required to be installed. The sanitary sewer service will be provided by the City of Roseville. The existing system currently has the capacity to handle the amount of wastewater generated by this type ofdevelopment.Itisconnectedtoone of Metropolitan Council’s nine Metropolitan Wastewater Treatment Plants. A sewer line will be stubbed off of the existing sanitary main in County Road C and will be extended into the property. The proposed buildings will be connected to this main line. Manholes will be provided every 200 feet to provide access to the main line on the site for serviceability and monitoring. All sanitary sewers area located outside the MDH required setbacks from a well. All onsite wells will be properly sealed per the MDH code prior to construction of the proposed development. 2)If the wastewater discharge is to a subsurface sewage treatment system (SSTS), describe the system used, the design flow, and suitability of site conditions for such a system. Not applicable. 3)If the wastewater discharge is to surface water, identify the wastewater treatment methods, discharge points, and proposed effluent limitations to mitigation impacts. Discuss any effects to surface or groundwater from wastewater discharges. Twin Lakes Station10 March 2020