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JUN-05-2003 11:45 WSB & ASSOCIATES 7635411700 24 WSB &Associates,Inc. June 5, 2003 The Honorable Mayor,City Council and Staff City of St. Anthony Village 3301 Silver Lake Road NE Minneapolis, MN 55418-1603 Re: Reduction of Clear Water Flow-In for Sanitary Sewer Systems St. Anthony Village,MN r? WSB Project No. 1065-57 Dear Mr. Mayor City Council and Staff The purpose of this letter is to discuss the options available to reduce clear water flows into the '... sanitary sewer system. By way of background,clear water in the Village is primarily groundwater which is directed into the sanitary sewer through foundation drains and sump pumps from private residences. Clear water flows cause the sanitary sewer system to backup into basements causing damage to properties and increasing the cost of sanitary sewage treatment. Foundation drains and sump-pump discharges from private residences should be disconnected from the sanitary sewer line and redirected to the storm sewer system to prevent damage to residents and to reduce the overall sanitary sewer treatment costs. The Village has completed a number of activities to reduce the flow of clear water into the sanitary sewer system. These activities include: 1. Mandatory inspection and disconnection of illegal foundation and sump-pump connections at the time homes are sold. 2. The Village has completed a City-wide educational program. This program included mailing brochures describing the problem,presenting solutions, and provided a contact at City Hall which would assist them with an evaluation of their property. This educational program is also conducted each year at the public information meetings associated with the street reconstruction projects. 3._ Since 1999 the Village has reconstructed nearly 17,000 lineal feet of sanitary sewer, a_nd_ _ all manholes within the City street reconstruction projects. Furthermore, the City has completed flood improvements which have reduced the occurrence of street and home flooding, which in the past has contributed to clear water flows into the sanitary sewer. 315®bts3i In 2002,the Village received information from the Metropolitan Council concerning an increase Aemorle'Highway in the rates to the sanitary sewer treatment charges due to the large volume of clear water in the iuite 3oa:: sanitary sewer flows. St. Anthony Village has increased its water rates to cover these direct expenditures. As a result of these cost increases and continued backups,the Village desires to vlinneap04. : reduce the quantity of clear water entering the sanitary sewer system. To achieve this goal,a Ainnesota number of options are available. Several options are provided below for your consideration: 511422 r63 5418©4. F:\WPWIN\1065-57\060403 Mayor City Staff.doe 763541+700 FAX Minneapolis • St. Cloud Equal Opportunity Employer