09/05/2007 Council Packet - Laserfiche WebLink

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DRAFT 8 -17 -07 XIII. SUMMARY OF FINDINGS TKDA was authorized to conduct a water treatment feasibility study for the City of Lino Lakes. As part of this study, the water quality information on each well was reviewed. Lino Lakes' water supply meets all primary drinking water regulations. There are two contaminates in the water that are of concern, iron and manganese. The maximum secondary contaminate level for iron is 0.03 mg /I and for manganese is 0.05 mg /I. The secondary contaminant levels are voluntary as they are there for aesthetics reasons. High iron causes red staining and high manganese causes black staining in laundry and household fixtures. Three of the existing wells are above the recommended secondary contaminant levels for iron, and four are above the recommended levels for manganese. The actual levels are on page 5. The levels are not extremely high and are not generating a large number of complaints. In order to determine a plant size and cost, we next estimated what the ultimate future demand for water will be in Lino Lakes. This demand level was determined using current trends, Minnesota DNR future requirements for conservation, and ultimate population projections. The Table on page 7 shows three scenarios. The ultimate peak day demand used for this study is 10.4 MGD. TKDA reviewed three (3) potential future water treatment plant sites. Of these, the two most viable were studied and soil borings were taken. The two (2) sites are a school district parcel at Birch Street, west of Timberlake Trail, and property the City owns on the Southeast corner of Centerville Road and Birch Street. Costs for developing a plant at each site were determined with the school district site being the lower cost alternative. A further look was taken at future storage needs. In 2004, a Comprehensive Water Study was completed by TKDA. This study projected to the year 2030 and recommended 1 MG of additional storage for a population of 32,000. In this study we have a total population of 42,000, about 1/3 more. Therefore, we are recommending 1.5 MG or 2.0 MG storage. A ground storage tank with raw water supply is planned for the central part of the City, whether there is a treatment plant there or not. The ground storage tank will require a booster station to boost the water from the ground reservoirs to the two elevated water towers. The booster station was sized in Chapter IV. Water Treatment Plant Study 23 13843.000