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Regular City Council Meeting Monday, February 12, 2007 Page 18 of 30 sive, on-site underground storage facilities installed, substantially reducing outflow, with long-term impacts yet to be determined. 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 significant rain events, and the success of that project in reducing drain- age and runoff issues. Mr. Schwartz detailed several new problelTI 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 Pit/Hamline Hoyt Reconstruc- tion Project (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 effolis of the City's Vari- ance Board in conditioning variance approvals on 30% impervious coverage 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. Mr. Schwartz reviewed efforts by the Minnesota Department of Transporta- tion (MnDOT) in using the 40-year old 100-year benchmark stornl data, and the need to update data with new data, potentially changing design event considerations for all new land use and construction; and various watershed district rules and additional requirements for local municipalities. Mr. Schwartz advised that the Public Works, Environment and Transporta- 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 for water quality improvement and storm water treatment to ensure that a clean and healthy environment.