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i MINNEHAHA CREEK WATERSHED DISTRICTI,� �- QUALITY OF WATER QUALITY OF LIFE Stormwater Management: The District's Stormwater Management rule is triggered for any project proposing to create new or replace existing impervious surface. Because the project proposes to increase impervious surface by 0.195 acres(8494.2 square feet)the District's Stormwater Management rule is triggered. Please submit the following information to fulfill the criteria of the rule: i. Per section 3(d)(2),there must be at least two feet of vertical separation between low openings of structures and the 100 year high water elevation of stormwater BMPs. The proposed infiltration basin has a 100 year high water elevation of 1012.35'and the existing metal garage has a first floor elevation of 1012.11'. i. With the current proposal,there will most likely be standing water against the metal garage with potential to cause structural damage/interior flooding. Ii. Please verify the low opening elevation of the garage. II. Submission of a maintenance agreement for the stormwater infiltration basin; i. MCWD will provide the template; ii. Please note that the agreement can be listed as required exhibit within the Letter of Conditional Approval. Additional Information: Wetland Protection: The Buffer provisions of the Wetland Protection rule are triggered when the Stormwater Management Rule Is triggered for any wetland that Is within the property parcel that is downgradient of site disturbance. Per MCWD permit 07-481,a 35-50 foot buffer has been declared to the parcel,therefore, no further exhibits are needed to fulfill the rule requirements. As we review your submittals,we may find the need to request additional information,and will so inform you. Please be advised that MCWD will retain the application and supporting materials submitted for one year from the date of this letter. After that,the application will be closed and a new application and supporting materials will need to be submitted to initiate the MCWD permit-review process. If you have any questions please contact me at 952- 641-4504 or houinn@minnehahacreek.org. Sincerely, ^oma Heidi Quinn Permitting Technician CC:Justin McCoy,Orono Schools Jed Nikula,Ebert Construction Melanie Curtis,City of Orono Christine Mattson,City of Orono Erik Megow,Wenck Associates We collaborate with public and private partners to protect and improve land and water for current and future generations. 15320 Minnetonka Boulevard,Minnetonka,MN 55345 - (952)471-0590 - Fax:(952)471-0682 - www.minnehahacreek.org