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Highway 12 Sewer Capacity Issues <br />April 29, 1996 <br />page 2 <br />Brothers Nursery development. These four developments combined account for 70 units of <br />sewer capacity. <br />However, the currently proposed neighborhood sewer projects and the potential lack of sewer <br />capacity to serve those projects, may require the city to move ahead with the sewer expansion <br />project; even though there is not, at this time, a substantial development proposal in the north <br />Highway 12 area. <br />Sewer Capacity Availability <br />There are three issues related to sewer capacity availability. <br />1. <br />2. <br />1. <br />2. <br />The joint trunk sewer agreement between the cities of Orono, Long Lake and <br />Medina. <br />The determination of the amount of capacity currently available in the existing <br />joint sewer trunk system. <br />3.Expansion of the sewer trunk system. <br />Joint Agreement <br />The joint sewer trunk agreement between the cities of Orono, L.^ng Lake and Medina <br />allocates 589 units of sewer capacity between the three cities as follows: <br />Long Lake 291 units <br />Orono 216 units <br />Medina 82 units <br />The city of Medina is at or near its allotted capacity. Based on separate analyses <br />completed by both the city’s consulting engineer and Mike Gaffron, it appears that on <br />the basis of normal or average sewer flows Orono has between 40 and 90 units of <br />allocated capacity remaining in the trunk system. However, Glenn Cook has indicated <br />that during times of high rain fall the "peak" flows may reach or exceed the capacity of <br />the system. This is due to the infiltration and inflow of storm water into the sanitary <br />sewer system. <br />If, based on current metering of sewer flows, there is unused capacity in the system, it <br />may be possible to obtain additional allocated capacity through a renegotiation of the joint <br />agreement. <br />Existing Capacity <br />Although based on normal sewer flows Orono has not used its full allocation of sewer <br />capacity, the city of Long Lake has experienced capacity problems in the trunk system.