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I I I Council Meeting Minutes June 12, 1995 Page 9 Council Business. continued Williams does not see benefit in leaving Swale 2 in its present state and would support grading, but added his actions are not driven by the concern of the townhomes' marketability. He feels that silt from this area which runs into Pond 3/4 may work against Pond 3/4's ability to hold water, and supports some modification to Swale 2 to remedy the current situation. He is somewhat concern of Pond 5, but is comfortable with mediation for Swale 2. Harstad suggests the orifice be opened at Swale 2 and then studied after a heavy rainfall to see if Pond 5 has problems. Harstad wants the area to be nice just as much as the Council. Benke asked if Proper intents to install a lO-inch orifice. Proper said the Ulteig Plan lists both 9 and 10 inch orifices and does not know their response. Melcher said RCWD approved the 9-inch orifice and this could work, but installation of a 10 inch could be discussed. Benke noted the two sets of calculations and feels that before the Council is comfortable with regrading Swale 2, the data needs to be reanalyzed. Melcher and Harstad feel a lO-inch orifice should be installed and if that doesn't work they could come back and discuss increasing the pond size. Proper agrees that the calculations need to be reevaluated. Fulton recommends that the lO-inch orifice be installed in Pond 3/4 and an agreement be entered into where the real practical impact of a 100-year flood is the true measurement of whether the system will work. If any problems occur, then both parties come back and mediate financially. Harstad does not have a problem with this and feels the lO-inch orifice will work. Fulton feels the Park Board should be contacted of this proposal. Williams noted the need for agreement between Ulteig and staff regarding the upgrade. Fulton said that assuming the orifice is installed and changes are made to Pond 2, the issue relates to the overall drainage pattern. If the engineering numbers are correct, Ulteig should be willing to stand behind them. Ulteig needs to determine the appropriate design, and enter into an agreement whereby they are held financially. Harstad feels the opening on Swale 2 is too small and increasing the flow by 35 % will clear up the problem. Benke suggests staff work with the applicant to resolve disagreements and come back to Council on June 27. Larson asked if this recol1unendation includes that no work be performed until June 27. Benke feels the area should not be regraded without an agreement. Williams requests the applicant and staff determine Swale 2's regrading, capacity, orifice, Pond 3/4 flow volume, and any potential affect to Pond 5. Larson asked to review Pond 5 I s outlet and distribution to the stormsewer. Motion by Gunderman, seconded by Williams, to REQUEST STAFF TO WORK WITH THE APPLICANT TO RESOLVE THE DETAILS AND DISAGREEMENTS OF THE INNSBRUCK PARK ESTATES PONDING AREA AND COME BACK TO COUNCIL ON JUNE 27,1995. 5 Ayes - 0 Nayes, Motion Carried. Council Business Innsbruck Park Estates Ponding Area Report 95-104