Minutes - Public Works Committee - 09/18/2012

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Interim Engineer Nelson indicated the property on the west side of Armstrong Boulevard has a septic system with plastic pipe so the operation was stopped immediately when part of that septic system was uncovered. Councilmember Elvig noted many of the septic systems in Ramsey are not well mapped because there are no as builts for them. Interim Engineer Nelson presented Change Order #2. Civil Engineer II Linton described the development history of this area. Councilmember Elvig asked about the $300,000 cost to develop the triangular parcel. He noted the AUAR contemplates large -lot residential development to the north to densify that area and some of the drainage comes from that location. He asked whether the drainage water had to be held longer because it was a natural flowage for the west holding pond. Civil Engineer II Linton confirmed the western area does have natural drainage areas. Councilmember Elvig stated there was also to be a swimming lake in that area. Councilmember McGlone noted there are 100 acres with no pervious surface of development, which is a "city," and asked why that assumption would ever have been made. Development Manager Lazan explained that a lot of pieces have come together and there was a thought at the beginning of COR THREE that the pipe was not in across the street but then more research found there was a 72 -inch pipe. The pond that was dug is really a small narrow portion on the south side so if the pipe filled, it would overflow into the pond and then slowly drain. The pipe was in the road, but not the entire width of the road so now the County road will need to be torn up to extend a very large pipe and turn it to get to the lake. Development Manager Lazan noted there were two unfinished pipes, with the outlet pipe to the pond also incomplete and put in as part of COR THREE. He stated he would not recommend the project at this price today but would like time to study the assumptions and bring back a recommendation for further consideration. Civil Engineer II Linton explained that to serve those three developments, watermain was extended up Zeolite Street that will have to be lowered to turn to the southeast and maintain gravity flow. Interim Engineer Nelson stated the total drainage area identified is about 64 acres and of that, North Commons about 3.4 acres. Development Manager Lazan stated the numbers assume no storm water so even if full build out is in the assumptions, some storm water work is needed to address flow. Public Works Committee / September 18, 2012 Page 10of16