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City Council Regular Meeting Minutes November 25, 1997 Page 4 1 1. The church develop and enforce an on-site parking plan with the assistance of the 2 Public Works Director and Staff, and 3 2. Receive approval from the City of Minneapolis regarding the Church's proposed storm 4 water retention plan. 5 Commissioner Thompson reported the motion carried unanimously. 6 Anthony Kaczor, 3008 - 33rd Avenue NE, stated he had been in attendance at the November 7 18, 1997, Planning Commission and there had appeared to be some confusion in regard to the 8 storm water drainage for this proposal, including who has jurisdiction of this site, Rice Creek 9 Watershed or Middle Mississippi. One resident was in attendance at the meeting and 10 expressed concern in regard to the storm water because of flooding in the area. Mr. Kaczor 11 expressed concern that no one from the Storm Drainage Task Force had been present to 12 address the issue and asked that the Council be clear on the storm water drainage. 13 Mayor Ranallo stated that previously the water from the church building would flow into the 14 alley behind St. Anthony Boulevard and Pahl Avenue. This proposal will change that by 15 placing a pipe under the new building and running the water out into the lawn in front of the 16 school. He noted that Ted McCrossan has been working on this proposal. Ranallo asked if 17 Mr. De Zelar had been working with the Middle Mississippi Water Management Organization. ftGary De Zelar, architect for St. Charles Borromeo Catholic Church, stated that the Middle 19 Mississippi Water-Management Organization has no guidelines in place and was relying on 20 the City of Minneapolis. He has hired an engineer to study the flow of the storm water and if 21 necessary to work with the City of Minneapolis in regard to retention of the water. 22 Mr. De Zelar stated he has received the calculations provided by the engineer in regard to the 23 flow of storm water. He noted the water on the property flows in three directions. The water 24 in Section A, from the rectory and the church, flows to the north to St. Anthony Boulevard; 25 the water from Section B, the area over to the center of Pahl Avenue, flows out to Pahl 26 Avenue; and Section C, the remainder of the property, all flows southwest to the Minneapolis 27 system. 28 Mr. De Zelar then displayed the engineers calculations of existing conditions and conditions 29 after completion of the proposed addition for the aforementioned three Sections. Section A 30 will remain the same, Section B existing is .17 and will be decreased to .12, and Section C 31 existing is .75 and will be increased to .78. The result is a run-off negative to B, positive to 32 C of 1/500th of a cubic foot per second. This is based on a hundred year event, twenty four 33 hour storm. 34 Mr. De Zelar stated that he has not yet discussed these calculations with the City of 35 Minneapolis. He noted their concern is the flooding on 27th Avenue and Stinson. If the flow is increased, they are looking for a detention of water so the flow will not be changed. If that 7 is required, alternatives would include ponding in front of the school, addition of another dry 38 well or increasing the size of an existing dry well, or the installation of a trickle down roof.