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I CITY OF ST.ANTHONY 2 CITY COUNCIL WORKSESSION MINUTES 3 September 7, 1999 0 7:00 P.M. 6 I. CALL TO ORDER. 7 Meeting called to order at 7:00 p.m. 8 9 II. ROLL CALL. 10 Councilmembers present: Ra.nallo,Marks, Faust,Thuesen,and Cavanaugh. 11 Councilmembers absent: None. 12 Also Present: Michael Mornson, City Manager, Kim Moore-Sykes, Management Assistant;Roger 13 Larson, Finance Director;Jay Hartman,Public Works Director; and Todd Hubmer,WSB& 14 Associates, Inc. 15 16 III. REVIEW 29'x`AVENUE NE STREET AND UTILITY IMPROVEMENTS PROJECT (T. 17 Hubmer,WSB, Inc.) 18 The City Manager reported that this item will be on the Council agenda for the September le 19 meeting. He also informed the Council that he will send out a notice to the property owners residing 20 on 29h Avenue advising them of the meeting and inviting them to attend. 21 22 Hubmer reviewed the proposed project and the timeframe. Councilmember Thuesen voiced his 23 disappointment with the feedback from the residents on 29's regarding sidewalks. He indicated that 24 he felt this was a golden opportunity to install them at the same time as the street improvement was 25 being done. 26 IV. REVIEW SANITARY SEWER STUDY(T. Hubmer,WSB, Inc.) Hubmer presented the results of the sanitary study that he completed. He reported on two primary 29 issues that the City needs to resolve regarding the sanitary sewer system;high flow rates generated by 30 infiltration/inflow and these flows exceed available capacity in some of the existing sewer lines 31 causing occasional sewer backups. Hubmer reported that records indicate that the City experiences 32 the highest flow rates in March and April because of the thawing that takes place at that time,and the 33 frozen ground is unable to absorb the run off so it seeps around building foundations were the 34 ground is thawed. He added that if there is considerable rain during this time, it further compounds 35 the problem. Hubmer reported that this water is usually collected by the structure's drain tile that 36 carries the water away from the foundation by gravity and it drains into the sanitary sewer system. He 37 reported that this drain tile system was a very popular residential construction technique in the 1950's 38 and 1960's to handle storm water,which kept it out of the basements. , 39 40 Councilmember Faust asked Hubmer if he had any data for years 1990 and 1991 because there was a 41 lot of rain during the spring thaw and remembered that there was extensive flooding in several homes. 42 The Mayor reported that a diversion plan with the City of Roseville was tried several years ago but 43 this plan only provided partial relief. He also indicated that the City has an emergency diversion plan 44 with the City of Minneapolis and is used only in the event of an emergency. 45 46 Hubmer reported that the study identified several sanitary sewer deficiencies that if corrected,would 47 provide some reduction in the high infiltration/inflow rates in the City's sanitary sewer system. He 48 fisted twelve areas where the sanitary sewer lines had either inadequate capacity or were impacted by limited downstream capacity and surcharging. Hubmer stressed that the primary source of the infiltration/inflow appears to be from private property foundation drain tile and possibly improper 51 connections of the sump pump to the sanity sewer. Hubmer reviewed his recommendations as listed 52 in the WSB Sanitary Sewer Study. He reported that if these capital improvement recommendations