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® B.A.Mittelsteadt,P.E. <br /> 350 Westwood Lake Office Bret A.Weiss,P.E. <br /> 8441 Wayzata BOUlevard Peter R Willenbring,P.E. <br /> Minneapolis, MN 55426 Donald W.Sterna,P.E. <br /> • Ronald B.Bray,P.E. <br /> 612-541-4800 <br /> �'fAssociates,Inc. FAX 541-1700 <br /> July 14, 1998 <br /> Mr. Mike Morrison <br /> City of St Anthony <br /> 3301 Silver Lake Road <br /> St. Anthony, MN 55418-1699 <br /> Re: Sump Pump Inspection Project <br /> City of St. Anthony <br /> WSB Project No. 1065.14 <br /> Dear Mr. Mornson: <br /> The purpose of this letter is to update you on-our preliminary findings and discuss potential <br /> revisions to the proposed program. <br /> In the past few months,we have had an opportunity to meet with City Staff on several occasions, <br /> view a limited number of homeowner connections,review City building and sewer construction <br /> records, and review some MCES flow records. Based on these efforts our findings to date <br /> • include: <br /> 1. 84% of the homes in St. Anthony were constructed prior to 1970, and only about 4% <br /> ( 93 homes)were constructed in the past 10 years. Sump pumps were not commonly <br /> installed in homes constructed prior to the mid-1980's, so we expect to find very few; <br /> pumps in the City. <br /> 2. The vast majority of the homes in St. Anthony were constructed with gravity footing <br /> tiles connected directly to the sanitary sewer system without the use of sump pumps. <br /> These systems have been called."passive"type systems. Redirection of these systems <br /> is highly intrusive and costly. Estimates for correction are in the range of$1,200 to <br /> $2,000 per house. <br /> 3. Identification of the passive systems may result in damages to private property since <br /> in many cases the connections are not readily visible and access may involve moving <br /> furniture and pulling up carpet. <br /> 4. There are many "wet" areas of the community where homes may require footing <br /> drains or sump pumps for many months of the year. In these areas the tile may operate <br /> during cold weather conditions so the discharge pipes will need to be protected from <br /> freezing. This may involve installing an-underground connection to the storm sewer or <br /> alternate discharge point. <br /> F:\WPW1M1065.14\071599-mm.wpd <br /> Infrastructure Engineers Planners <br /> EQUAL OPPORTUNITY EMPLOYER <br />