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Surface and groundwater resources are deemed Public Waters (or Waters of the State of Minnesota). The Minnesota Department of Natural Resources (DNR) manages the appropriation of water from public waters through its Water Appropriations Permit program. It is the mission. of the ON R to monitor public waters and take necessary conservation measures to protect the resource from excessive withdrawal. Surface Water Quantity Centerville and Peltier Lakes are partially located in the City. These lakes are part of the Rice Creek chain and are used as reservoirs for the City of Saint Paul's public water supply system. Centerville Lake covers 455 acres with a maximum depth of 19 feet and a Littoral area (POrtion of the lake that is less than 15 feet in depth) of 276 feet. Peltier Lake covers 465 acres with a maximum depth of 18 feet and a Littoral area of 412 acres. These lakes discharge their water to the George Watch Lake located immediately west. Clearwater Creek (County Ditch 47), which flows during wet periods, discharges into Peltier Lake. This creek and other County and private ditches and small ponds comprise the remaining surface water found in the City. The potential flood zones provided in Figure 12 are associated with lower land areas along the lakeshore, ditch and creek. Groundwater Quantity The City's wells utilize the Prairie du Chien-Jordan aquifer unit to supply water to its public water supply system. Other aquifers in the area include the Quaternary (sand and gravel aquifer that lies above the Prairie du Chien-Jordan) Franconia-Ironton-Galesville, and the Mount Simon Hinckley. A 1990 investigation by the US Geological Survey (Effects of Present and Projected Ground- Water Withdrawals on the Twin Cities Aquifer System. Minnesota; Water-Resources Investigations Report 90-4001) indicates that the total 1980 groundwater withdrawals (200 million gallons per day) represents apprOXimately one-half of the safe yield of the regional aquifer system. An approximate limit for groundwater availability in the region is from SOO to 800 millions gallons per day. This investigation included groundwater withdrawals for lake level augmentation and building cooling systems that has since been prohibited by the Minnesota Department of Natural Resources. The Minnesota Geological Survey's (MGS) County Well Index (CW/) and the Minnesota Department of Natural Resources' (DNR) State Water Use Database System (SWUDS) were utilized to identitY high-capacity wells in the area that could affect the delineation of the City's WHPA. Three high capacity wells have been identified to fall within one-mile of Centerville's wells. Information on these groundwater appropriations is provided below. With the exception of the City's municipal wells, no groundwater observation wells have been identified within the City's DVVSMAs. DNR data of regional groundwater elevations provide information on trends in groundwater quantity. Also, the pumping records and static water levels of the City's wells continue to be collected to determine the trends in groundwater quantity and availability. No well interference problems have been identified by the DNR within Centerville's DVVSMA or the region. July 3, 2007 DRAFT Centerville Wellhead Protection Plan (Part 2) Page 8 ---------------------------------- -- - ---- -__02--___________