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April 26, 2017 Mike Ericson Page 3 of 7 Reference: City of Centerville Local Water Plan iii. Physical Environment: The current plan covers general information regarding the general location, geology and topography, soils, climate, lakes and other significant waterbodies, wetlands, land use, utility systems, unique areas, zoning and floodplain management, and groundwater characteristics of the City. The LWP will detail drinking water supply management areas (DWSMA) and the city's plan for addressing/protecting groundwater. The Plan will discuss groundwater discharge and recharge areas including the identification of potential land uses affecting groundwater. The City will update land use and zoning maps for present and future conditions, as well as a land cover classification map, such as Minnesota Land Cover Classification System (MLCCS) maps. Key Conservation Areas will be identified. We will specifically review the impaired waters list under the water resources section and compare it to the most recent 303d impaired waters list from the Minnesota Pollution Control Agency. A map of these waters will be provided. Water bodies with TMDLs will be listed in this section. For Centerville, these include Peltier Lake & Centerville Lake TMDL, Lino Lakes Chain of Lakes TMDL, Upper Mississippi River TMDL. The Upper Mississippi River TMDL for bacteria has been set recently, so we will discuss actions for addressing the TMDL in this section. We will perform a review to this information and work with the City to verify any changes or additions that are needed to remain in compliance with the section. iv. Hydrologic Calculations/Modeling Parameters: This section covers the water quantity and NURP standards when designing storm water ponds and other stormwater features. We will update the design storm parameters to reflect the new NOAA Atlas 14 Rainfall data that has become the new industry standard. The LWP will address physical changes to the stormwater system, and if there are changes, these will be reflected in an updated map of the system. It is our understanding there is not a City-wide stormwater model for the City of Centerville and this proposal does not include time for the development of any hydrologic or hydraulic modeling. Stantec is aware the Rice Creek Watershed District has created a district -wide hydrologic and hydraulic model. Stantec well request to obtain a portion of the model that includes the City of Centerville to try to gather information on drainage areas and paths of stormwater runoff, as well as to provide information about future conditions and intercommunity flows. The model outputs might also help identify and acknowledge future changes to structures that have potential for overtopping, as well as impacts of future land use changes on peak water elevations at storage areas that are currently at risk to flooding due to the more intense storms that are occuring. Additionally, RCWD requires an updated floodplain map, which will also be acquired by the RCWD and based on their District - Wide Model. v. Water Resources Management Objectives and Policies: The current water resources management objectives and policies cover items related to: water quantity; water quality; recreation; fish and wildlife; enhancements of public participation through information and education; public ditch systems; Dr.sigrt with community in mind 89