CCP 03-28-1994 - Laserfiche WebLink

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. Average Daily Flow = 300,000 gpd Peak Flow Rate = 1,000 gpm As previously mentioned, the existing wastewater pumping system (main lift station and off-site forcemains) is outmoded, expensive to operate, and in need of replacement. In recognition of these facts, the U.S. Army commissioned a study of alternative discharge locations that could receive the wastewater flow from TCAAP. The findings of this study are summarized below. AT.):'F.RNATlVR DISCHARGE I.OCATJONS MWCC Facilities MWCC staff identified a 66-inch diameter gravity interceptor (4-NS-523), Lift Station L-35, and a 24-inch diameter gravity interceptor in Arden Hills as potential alternative discharge locations (see attached exhibit). The MWCC 4-NS-523 gravity interceptor conveys the wastewater flow from approximately 50% of Mounds View, as well as the communities upstream of Mounds View. It has adequate capacity to convey TCAAP's "modified caretaker" status wastewater flow. t MWCC Lift Station L-35 is located west of U.S. Highway 10 along County Road H. It discharges via a 24-inch forcemain to the MWCC 4-NS-S23 gravity interceptor jyst west of;lIie ~_ Fridley/Mounds View corporate boundary. Lift Station L-35 serves the remaining 50% of.-;' --. . Mounds View. The lift station was over-sized when it was constructed in 1965 to provide - sufficient capacity to convey TCAAP's wastewater flow. The lift station has a firm pumping - capacity of approximately 4,400 gpm. Mounds View's peak flow into the lift station is only 1,600 gpm. Consequently, the lift station has reserve capacity (2,800 gpm) well in excess of TCAAP's "modified caretaker" status peak flow rate of 1,000 gpm. The MWCC 24-inch gravity interceptor near 1-694 was also investigated as an alternative discharge location. However, it was learned that the MWCC has planned for years that TCAAP's wastewater flow should be conveyed to Lift Station L-35 for pumping to the 4-NS-523 gravity ~ in terceptor. Also, it was learned from MWCC staff that the reserve capacity of the 24-inch gravity interceptor was marginal to convey TCAAP's wastewater flow. City of Mounds View Facilities Research of Mounds View facilities revealed that the City has a 21-inch gravity line along County Road H that has adequate capacity to convey TCAAP's "modified caretaker" status peak flow rate of 1,000 gpm to.the MWCC's Lift Station L-35. Because only 3/4 ofa mile of gravity interceptor would be necessary to connect TCAAP's main lift station to the Mounds View 21-inch gravity line, this alternative was selected for implementation. City of Arden Hills Facilities . Research of Arden Hills' facilities identified an I8-inch gravity line that is tributary to the MWCC's 24-inch gravity interceptor. However, this alternative discharge location was rejected for the following reasons: 049.220J.feb S20-049-70