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APR-07-1999 10:17 WSB & ASSOCIATES INC. 6125411700 P.02iO3 <br /> - BA.Mirrelneadr,P.E. <br /> 350 Westwood Lake Office 9rct A.Wd%RE <br /> 8441 Wayzata Boulevard Perk R.vviuenbring,l'E <br /> ! Minneapolis, MN 55426 Donald w stem,EE <br /> Ronald B.Bray,EE <br /> 612-b4i-4800 <br /> &Assadates, Inc. FAX 541-1700 <br /> Memorandum <br /> To: Mr. Mike Mornson, City of St Anthony <br /> Mr. Jay Hartman, City of StAnthony <br /> From: Charles Janski <br /> c: Mr.Pete Willenbring, WSB <br /> Mr. Todd Hubmer,WSB <br /> Date: April 6, 1999 <br /> Re: Status Report <br /> MCES UI Grant Project <br /> The sanitary sewer system in the City of St Anthony has two known problems that are to be <br /> investigated in this study. The first is inadequate flow capacity that results in backups during <br /> high flow conditions,and the second is the significant volume of clear water,infiltration and <br /> inflow(I/I),that enters the system. The two problems are directly related since the I/I is a <br /> substantial portion of the flow that exceeds the pipe capacity,but it may not be feasible to reduce <br /> the III flow to the available capacity so it is important to also consider capacity improvements. <br /> Over the past few months we have focused on the system capacity issue in order to reduce the <br /> potential for sanitary sewer backups as soon as possible. In this effort we have reviewed MCES <br /> flow records and some record drawings of the City collection system. <br /> The sanitary sewer backups in the Harding Street area appear to be related to the capacity of the <br /> existing lift station at 37h Avenue. The lift station pumps the wastewater south on Harding <br /> Street to the gravity system at 35`h Avenue. The wastewater continues flowing south in the <br /> gravity system down Harding,Edward,Roosevelt, and Wilson Streets to the MCES interceptor <br /> line just south of the City limits. Increasing,the Harding Street lift station capacity would <br /> increase the flow in the downstream sewer sections and increase the potential for sanitary sewer <br /> backups in these areas unless additional capacity can be provided by increasing pipe sizes or <br /> possibly re-routing some of the flow. We are currently looking into short-term options for re- <br /> routing the flow to reduce the capacity required in the downstream sewer segments. <br /> Minneapolis S t . C l o u d <br /> Infrdstruetwre Engineers Planners <br />