05-13-1996 Council Packet - Laserfiche WebLink

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>• Highway 12 Sewer Capacity Issues April 29, 1996 page 4 For example; the city of Long Lake has indicated the bottleneck area that has caused them to believe there is a capacity problem is located where the sewer line on Watertown Road south of the Burlington Northern Railroad connects to the trunk line running to the Metro lift station. Glenn Cook has indicated this specific bottleneck could be addressed at an estimated cost of $150,000. A.Expansion Alternatives As indicated above, the city ’s plans for the sewer capacity expansion have reflected the expansion of the sewer trunk system through Long Lake to the Long Lake lift station. There is another alternative that was considered but determined to be unacceptable in 1990, but which may merit consideration at this time. The alternative is to direct all new sewer flows down Old Crystal Bay Road to the Metro lift station, the city ’s former sewer plant, adjacent to the French Lake Preserve Park. The reasons this may merit consideration at this time are as follows: 1.) A major reason this alternative was disapproved in 1990 was the fear that having sewer available along the large areas of undeveloped properties adjacent to Old Crystal Bay Road would create pressure for increasing densities beyond the two acre level. Much of the property along Old Crystal Bay Road has, since 1990, been developed at two acre densities, i.e. the Dickey property, the Coffin property, and the area in the northeast quadrant of Watertown Road and Old Crystal Bay Road. Although there several significant properties remaining to be developed, the development density standard has been set for the area. 2.) The potential construction of a two lane roadway south of the Burlington Northern Railroad could result in the city considering whether the property in the southwest quadrant of Highway 12 and Old Crystal Bay Road (between the railroad and Highway 12) should be developed with sewer. If this was to occur, the sewer flows generated by the development could be directed down Old Crystal Bay Road. Local Vs. Regional Issues Although the Metropolitan Council is requiring that the Highway 12 area sewer capacity issues be resolved prior to approval of the city ’s current MUSA amendment, these issues are primarily local issues versus regional issues. The sewer capacity issues relate to local facilities, local agreements, and local decisions. The capacity of the Metro system is only a factor to the extent the MCWS (formerly MWCC) will eventually need to upgrade the capacity of the Metro lift station in Long Lake to accommodate increased local sewer flows. The Metropolitan Council staff have not expressed any concern regarding the impact of increased sewer flows related to the current MUSA amendment on the Metro lift station. The Metro lift station capacity issue was addressed at the time of the city ’s 1987 MUSA amendment which reflected an additional 300-4(X) units of sewer flow. The current amendment, which reflects approximately 70 units of additional sewer flows, will have a comparatively minor impact on the Metro capacity. The existing Metro lift station was designed with the capability of accommodating substantially increased sewer flows through the addition of a third pump.