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CMP Part 4C. Water Supply <br /> Long Lake Interconnections <br /> During emergency events, the Orono Highway 12 system and the Long Lake <br /> system are able to provide water service to each other through a series of <br /> interconnections. In the past,this arrangement is able to work for extended periods <br /> of time due to the large extra capacity of Long Lake wells, along with the large <br /> elevated storage in the City of Orono. In the event of emergency water supply <br /> needs, where one of the system wells are to be off-line for an extended period, the <br /> combined firm supply capacity is able to meet the maximum day demands of the <br /> combined systems by nearly 500,000 gallons. <br /> In addition, the combined water system can meet domestic demands for its <br /> customer base during the event that either tower is taken off line for repairs or <br /> rehabilitation. During these outages, available fire flows will be reduced <br /> significantly compared to when each tower is in operation. In the event of the <br /> Orono tank being taken off line, available fire flows will be reduced to <br /> approximately 700-750 gpm throughout the northwest area of the Highway 12 <br /> system. While adequate for residential fire flows, the fire department should be <br /> aware that tankers may be needed on-call if a larger fire occurs at a large industrial <br /> or institutional customer. <br /> There are currently four interconnections between the Long Lake and Orono <br /> (Highway 12)water systems. Two of the interconnections have automatic pressure <br /> reducing valves (PRVs) which allow emergency flow in either direction if an <br /> emergency occurs and system pressure drops below a minimum pressure setting. <br /> The interconnections are located near the following intersections: <br /> • Virginia Avenue and Wayzata Boulevard (Automatic PRV) <br /> • Shaughnessy Avenue and Wayzata Boulevard <br /> • Brimhall Avenue and Wayzata Boulevard(Automatic PRV) <br /> • Willow Drive North and Wayzata Boulevard <br /> The PRVs rarely operate, especially since the set points for operation are at low <br /> levels which are not impacted by normal operating conditions. The primary <br /> operation of these interconnections would be during an emergency such as a large <br /> fire when additional water would be required for the duration of the fire. In the <br /> event that one system loses supply capacity or a tower is taken out of service,these <br /> interconnections can also be utilized. <br /> City of Orono Community Management Plan 2020-2040 Part 4C, Page 17 <br />