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Regular City Council Meeting Monday, February 12,2007 Page 18 ] pacting storm water management. Two significant areas experiencing re- � construction efforts and corrective drainage action included the expansion of � the Rosedale Shopping Center, and former Frank's Nursery site, with exten- � sive, on-site underground storage facilities installed, substantiallyreducing �a outflow, with long-term impacts yet to be determined. 6 7 Mr. Schwartz noted the Arona Pond (Area 5) expanded as part of the Ap-- � plewood Pointe redevelopment, its performance to-date measured with sev- � eral significantrain events, and the success of that project in reducing drain- .� � age and runoff issues. 11 1� 13 ]� ]� l� 1� 1� 1 �� �� �1 Mr. Schwartz detailed several new problem areas identified since the plan's last update, and continuing study to reduce runoff rates, review of develop- ment sites, and infiltration issues. Mr. Schwartz briefly reviewed the Gottfried Pi�IHa�nline Hoyt Reconstruc- tion Proj ect (Como Area Subdivision 7), and ongoing and significant prob- lems experienced south of this land-locked area and the need to look at con- structing additional infiltration systems, examine soil types, and how to im- plement better improvements. �� Mr. Schwartz spoke to concerns and cooperative efforts of the City's Vari- �:� ance Board in conditioning variance approvals on 30% impervious coverage �4 restrictions; and additional code requirements that would require potential �� mitigations issues for certain variances, with implementation of on-site im- �� provements to reduce storm water system impacts. 2� ��s Mr. Schwartz reviewed efforts by the Minnesota Department of Transporta- �� tion {MnDQT) in using the 40-year old 100-year benchmark storm data, and 3� the need to update data with new data, potentially changing design event 31 considerations for all new land use and construction; and various watershed �� district rules and additional requirements for local municipalities. �3 �� Mr. Schwartz advised that the Public Works, Environment and Transporta- �S tion Commission had reviewed the annual report and concurred with its con- �� tent, as well as supporting short-term improvements as proposed. Mr. �� Schwartz indicated that future mandates would include additional methods 38 for water quality improvement and storm water treatment to ensure that a �� clean and healthy environment.