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Feasibility Study <br />Water Treatment Plant <br />City of Lino Lakes, MN <br />WSB Project No. 015822-000 Page 22 <br />7.2.2 Detention <br />A cast-in-place concrete detention tank to enhance the oxidation and treatment of <br />manganese and iron. The tank will be sized with a detention time of 10 to 30 minutes <br />depending on the treatment results obtained from the water treatment pilot study. <br />7.2.3 Filters <br />The upper level of the plant may consist of an aerator on top of the detention tank, splitter <br />box, and filters. The upper level will also contain walkways around the filters and control <br />panels to allow the operators to manually initiate backwashes from this level, if needed. <br />7.2.4 High Service Pump Room <br />A high service pump room in close proximity to the electrical room and generator room. <br />7.2.5 Chemical Rooms <br />Chemical rooms for chlorine gas, sodium permanganate, fluoride, orthophosphate, and <br />polymer to aid in backwash settling. <br />7.2.6 Electrical Room <br />An electrical room in close proximity to the high service pump room and generator room. <br />The service entrance and automatic transfer switch would also be located in this room. <br />7.2.7 Generator Room <br />A generator room to house a standby generator that is capable of running the water <br />treatment plant and selected nearby wells in the event of a power outage or possibly for <br />peak shaving. <br />7.2.8 Mechanical/Blower Room <br />A mechanical room that contains the make-up air, dehumidification, HVAC equipment, <br />and an air-wash blower for filter backwashing. This room may also contain the air <br />compressor for process valves and building compressed air. <br />7.2.9 Storage Room <br />A storage room to store miscellaneous parts and materials. <br />7.2.10 Office/Control Room/Laboratory <br />A combined office/control room/laboratory for record drawings and Operation and <br />Maintenance manuals, plant controls and SCADA system, and laboratory equipment to <br />analyze water quality parameters. <br />7.2.11 Clearwell <br />A 250,000-gallon underground clearwell tank located under the filters and high service <br />pump room. <br />7.2.12 Backwash Tank <br />Below grade concrete backwash tank with two cells to allow for more than one filter to be <br />backwashed in one day.