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7.4.2 Conjunctive Use of Surface and Groundwaters There is one surface water source that was considered as a possible water source for the City— nearby Centerville Lake. Centerville Lake and Peltier Lake were created in 1912 with the construction of a dam by the Saint Paul Water Utility (SPWU), which owns the sole water rights to both lakes and much of the surrounding land. According to DNR Hydrologist Tom Hovey, these lakes are some of the best in Anoka County and would serve as a viable and sustainable source of water in an emergency situation. This is borne out by the fact that, prior to utilizing the Mississippi River as its primary source of raw water, they provided as much as 25 MGD, most recently during the drought of 1988. Mr. Jim Haugen of the SPWU indicated that, should the City of Centerville decide to pursue this option, the SPWU would probably be willing to enter into an agreement whereby the City could use these lakes as an emergency source of water. There is potential to use Centerville Lake as a surface water source in conjunction with the City's existing groundwater wells. However, considering the anticipated interconnection with Lino Lakes, along with the added costs associated with constructing surface water treatment facilities, Centerville would realize only small benefits in return for relatively large costs. 7.43 Alternative Sources of Water Prior to its connection with the City's water system, Centerville Elementary School operated its own water system, which included a private well with a capacity of 500 gpm. In accordance with MnDOH requirements, the school's well was disconnected from the school's system and is used for irrigation purposes only. Considering the age of the well (presumably drilled at the time of the school's construction in 1959) and the number of changes to MnDOH regulations over the years, it is difficult to know whether or not the school's well meets current standards. In all likelihood, it does not. However, given the following set of circumstances, the use of the school's well as an emergency source of water for Centerville's system would be possible: • The well itself would need to be brought into compliance with current MnDOH standards for municipal wells. This would include a detailed investigation of the site, well construction, and water quality. • The City would be required to obtain either ownership or control by easement of the area within a 50 -foot radius of the well. • Appropriate equipment modifications would have to be made, including the installation of a booster pump, shut -off valves, backflow prevention devices, and chemical feed apparatus. Again, considering the likelihood of an interconnection with the City of Lino Lakes and the degree of uncertainty of the effort and expense required to make use of the school's well possible, it is not recommended as an alternative water supply at this time. • CWP- 260A.080 7 -3 260 -080-25