CC MINUTES 07121988 - Laserfiche WebLink

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I Enrooth Perceives $18 ,000 Study Had Confirmed What City Has Been 2 Telling Residents All Along 3 The Councilmember observed it had taken a $10,000 storm sewer study 4 and a $5 or $6,000 -sanitary sewer study to reconfirm that there is 5 really little the city can do outside of spending two or three 6 million dollars to protect a few homes from flooding during severe 7 rainfalls with the exception of spending a few more dollars to find 8 out through a topographical survey whether grading an alley might 9 alleviate some of the problems for one or two homeowners who can't 10 do anything else for themselves to solve their problems. 11 Council Action 12 Mr. Childs was requested to get a quote for the survey for 13 presentation at a future Council meeting. 14 Sanitary Sewer Study - Robertson 15 The engineer identified the Wilson Street trunk line, which runs from 16 29th Avenue N.E. to Lowry Avenue with jogs over to Kenzie Terrace and 17 down Coolidge and back to Lowry. He emphasized that any improvements 18 on this line had to be predicated on the 18 inch line at Lowry which 19 takes the sewage to a 33 inch line into Minneapolis. 20 Mr. Robertson indicated that if the City wanted to enlarge its lines 21 in order to increase the flow into the Metropolitan feeder line it 22 would have to get the state agency's and Minneapolis permission to do 23 so. Conversations he had with those in charge had indicated they 24 were ready to accommodate "normal flows" but would take a harder line 25 with cities like St. Anthony who have excess flows into their system 26 from surface water getting into sanitary sewer systems through 27 foundation drains. 28 Mr. Robertson warned that it would be very expensive for the City to 29 take measures like installing back water valves or sump pumps which 30 had been discussed estimating that if there were 400 homes with 31 drain tile connected to the sanitary system at $3 ,000.00 per home, it 32 would cost well over a million dollars to divorce the foundation 33 water from the sanitary sewer system. 34 The engineer agreed with Councilmember Enrooth that the City's 18 35 inch pipes would have no problem handling normal sanitary sewage 36 flow without storm water infiltration through drain tiles. He said 37 the pipes are only one quarter filled during non-rain periods and 38 cracked pipelines and manhole seepage is minor compared to what goes 39 into the system from drain tiles when it rains. 40 Mr. Robertson agreed with Councilmember Ranallo that although the 41 inability of the sanitary sewer system to function during a storm 42 with the drain tiles connected contributed somewhat to the storm 43 sewer problems in the Murray/St. Anthony Boulevard, those problems • 15