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• <br />• <br />• <br />WATER TREATMENT <br />Lino Lakes' existing water system incorporates treatment by simple chemical addition at the well heads. <br />Treatment methods include disinfection by gas chlorination and fluoridation by the addition of <br />hydrofluorosilicic acid, for dental prophylaxis. Polyphosphates are also added at the well head as a <br />sequestration agent in an attempt to reduce iron and manganese problems. The following information <br />summarizes the need for and effectiveness of these existing treatment methods. Representative iron and <br />manganese levels can be found in Table B below. These levels can be compared with the Environmental <br />Protection Agency (EPA) recommended secondary (non - health related) levels of 0.3 mg /L for iron and <br />0.05 mg /L for manganese. <br />TABLE 8 -3 <br />RAW WATER IRON AND MANGANESE DATA <br />Well No. <br />1 <br />2 <br />3 <br />4 <br />5 <br />EPA <br />Iron (mg /L) <br />0.71 <br />0.46 <br />0.03 <br />0.18 <br />1.15 <br />0.30 <br />Manganese (mg /L) <br />0.11 <br />0.40 <br />0.26 <br />0.05 <br />0.15 <br />0.05 <br />CLEARWATER CREEK BOOSTER STATION <br />The Clearwater Creek Booster Station was constructed in 2002 in the garage of Well Pumphouse No. 4, <br />to provide the Clearwater Creek subdivision with elevated water pressure. The Booster Station consists of <br />two centrifugal pumps with variable speed drives to maintain a constant elevated system pressure. The <br />station also has provision for a third pump to account for future growth within the subdivision, or <br />expansion of the higher pressure area to the west side of I -35 E. <br />TABLE 8 -4 <br />BOOSTER PUMPS <br />Booster Pump No. <br />Design Boost (pounds <br />per square inches) <br />Design Pumping Rate <br />(gallons per minute) <br />1 <br />23 <br />400 <br />2 <br />23 <br />400 <br />WATER DISTRIBUTION SYSTEM <br />The water distribution system consists of all the components necessary to convey water from the wells or <br />storage tanks to the individual point(s) of demand. These demands are generated independently by all of <br />the serviced customers and by public needs such as hydrant streams for fire - fighting, skating rink <br />flooding, watermain maintenance, and flushing. While the major component of any system is the buried <br />watermains, the total system also includes hydrants, valves, services and meters, and supplemental <br />pumping facilities, as required. A distribution system's adequacy is based solely on its ability to deliver <br />water, at an appropriate rate and pressure, to each and every demand point in the system. The City of <br />Lino Lakes' water distribution system has been well maintained, and it has provided a dependable level of <br />service to the City for many years. Geographically, the system supplies the majority of the developed City <br />and covers over 55 feet of vertical elevation. <br />WATER SYSTEM INTERCONNECTIONS <br />The City of Lino Lakes' water system is interconnected with the neighboring Cities of Centerville, Circle <br />Pines, Hugo, and Shoreview, and a recently completed connection to the City of Blaine. In addition, there <br />are two interconnects to the Minnesota Correctional Facility water system. These interconnections are <br />important to the reliable operation of a water system, enabling cities to back -up their water supply to <br />safeguard against failure of a well, or an extreme fire event. <br />8 -7 <br />