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Page 16 <br /> <br /> <br />gravity system and the lift station that serves this system are sized to accommodate development <br />per the City Engineer. <br /> <br />(2) If the wastewater discharge is to a subsurface sewage treatment system (SSTS), <br />describe the system used, the design flow, and suitability of site conditions for <br />such a system. If septic systems are part of the project, describe the availability of <br />septage disposal options within the region to handle the ongoing amounts <br />generated as a result of the project. Consider the effects of current Minnesota <br />climate trends and anticipated changes in rainfall frequency, intensity and amount <br />with this discussion. <br /> <br />Post-development, wastewater will not discharge to a subsurface sewage treatment (septic) <br />system. Currently, the site is not connected to City wastewater utilities, and on-site septic <br />systems are used. The Phase I states, according to the property owner, “the property is connected <br />to two septic systems (one for each house)” (Appendix H). Prior to site development, the two <br />septic systems will be abandoned in accordance with Chapter 78 of the Elk River City Code (2), <br />section 17.5 of the Sherburne County Zoning Ordinance (1), and with Minnesota Rule Chapter <br />7080.2500. <br /> <br />(3) If the wastewater discharge is to surface water, identify the wastewater treatment <br />methods and identify discharge points and proposed effluent limitations to <br />mitigate impacts. Discuss any effects to surface or groundwater from wastewater <br />discharges, taking into consideration how current Minnesota climate trends and <br />anticipated climate change in the general location of the project may influence the <br />effects. <br /> <br />The wastewater treatment facility includes two anoxic tanks, six aeration basins, and three <br />clarifiers. Ferric chloride is added to remove phosphorous, chlorine is added to remove bacteria, <br />and sulfur dioxide is added to remove leftover chlorine. Ultraviolet lights are also used to <br />sterilize the remaining bacteria in the water. The treated water is discharged to the Mississippi <br />River (24). <br /> <br />iv) Stormwater – Describe changes in surface hydrology resulting from change of land <br />cover. Describe the routes and receiving water bodies for runoff from the project site <br />(major downstream water bodies as well as the immediate receiving waters). Discuss <br />environmental effects from stormwater discharges on receiving waters post <br />construction including how the project will affect runoff volume, discharge rate and <br />change in pollutants. Consider the effects of current Minnesota climate trends and <br />anticipated changes in rainfall frequency, intensity and amount with this discussion. <br />For projects requiring NPDES/SDS Construction Stormwater permit coverage, state <br />the total number of acres that will be disturbed by the project and describe the <br />stormwater pollution prevention plan (SWPPP), including specific best management <br />practices to address soil erosion and sedimentation during and after project <br />construction. Discuss permanent stormwater management plans, including methods of