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DRAFT 8 -1 -07 WATER TREATMENT PLANT CITY OF LINO LAKES, MINNESOTA PROJECT NO. 13843.000 1 PURPOSE OF STUDY TKDA has been authorized to conduct a water treatment feasibility study for the City of Lino Lakes. As part of this study TKDA has reviewed the water quality information on the existing wells to determine; the existing quality, the levels of iron and manganese in the water, what constituents should be removed by treatment, and levels of removal. As part of a separate study, TKDA had estimated the water demands for the future based on the DNR policies for appropriating water and based on the ultimate population projection for Lino Lakes. Using these demand projections, a plant capacity was determined. Blending of raw well water with the treated water on peak days was evaluated to reduce the treatment plant size. With a smaller plant size, Lino Lakes' ultimate service area could be served by a single water treatment plant. Two potential future water treatment plant sites were studied and were used to determine the best possible plant location and costs were developed for both sites. A review of future storage needs, water supply, high service pumping needs, and treatment plant sizing was performed based on ultimate population projections. In addition, TKDA reviewed the available treatment technology and selected two types of process equipment for iron and manganese removal. Two different plant layouts were developed based on the space needs for this equipment. Preliminary floor plans were developed and the plant site plans were developed. From this, the acreage needed for a future plant site was determined. After determining the plant size, locations, and layouts, cost estimates were made for the two types of equipment at the two site locations. Included in these cost estimates, are the raw watermains and treated water distribution mains needed for each option. From this data, four cost estimates were prepared. Funding options and final recommendations for these options are at the end of the report. Water Treatment Plant Study 3 13843.000 •