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<br />. <br /> <br />_ / f ~ ~ ~ ~ CONSULTING ENGINEERS <br /> <br />""'''1 Maier Stewart & Associates Inc. <br />April 15, 1993 <br />File: 230-000-00 <br /> <br />Mr. Pat Klaers, Administrator <br />City of Elk River <br />P.O. Box 490 <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />RE: TH 10 LIFT STATION <br />WASTEWATER TREATMENT PLANT UPGRADE <br /> <br />Dear Mr. Klaers: <br /> <br />. <br /> <br />In 1988, the City undertook the construction of an 18-inch sanitary sewer along Main Street <br />which provided capacity for sewer in the western area of the City. This improvement ended <br />where Main Street meets TH 10, because that was the limits of the 1988 Street Improvement <br />project. It was assumed the upgrade of the last segment of old 12-inch sewer to 18-inch along <br />TH 10 together with the reconstruction of the existing lift station along TH 10 would take place <br />at the same time as the wastewater treatment plant (WWTP) was upgraded. <br /> <br />The lift station and associated forcemain which pumps the sewage flow from the trunk line to the <br />treatment plant was built as part of the original WWTP in 1959. In 1976, two of the three <br />pumps were replaced. <br /> <br />Since the 1988 improvement project, we have monitored the operation of this lift station. <br />Recently, an event recorder was installed in the lift station to monitor its operation. The results <br />indicated the lift station is operating well beyond its design capacity. During daytime hours, <br />often a pump will start and run non-stop for several hours with secondary pumps needed during <br />the same period of time because of peak flows. Even in the middle of the night, a pump starts <br />on the average of every 5-7 minutes. <br /> <br />As you are aware, the current schedule for the WWTP upgrade calls for construction in late 1994 <br />and 1995. We are concerned that the development proposed in the western area will surely <br />overload this lift station prior to 1995, not to mention the problem a failure of one of the pumps <br />could cause right now. <br /> <br />. <br /> <br />For these reasons, we would suggest the lift station, forcemain, and trunk line upgrade be <br />segregated from the WWTP project and proceeded with immediately. It is likely plans and <br />specifications could be prepared and construction initiated in late summer such that the new lift <br />station would be in operation prior to new homes in the western area. <br /> <br />1959 SLOAN PLACE, SUITE 200, ST. PAUL, MINNESOTA 55117 612-774-6021 <br />9800 SHELARO PARKWAY, SUITE 102, MINNEAPOLIS, MINNESOTA 55441 612-546-0432 . Equal Opportunity Employer <br />