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<< w;r; Q L S WARNER ROAD, ST. PAUL, MN 55 16 ILE NO. May 4, 1995 Mr. Jay Pomeroy AJA Inc. - Valley Square Suite 200 Office Center 7575 Golden Valley Road Minneapolis, MN 55427 RE: Roseville High School, Stormwater Management Plans Dear Mr. Pomeroy: I have reviewed plans received (April 5, 1995) for the Roseville High. School Additions and renovations and have the following comments: 1. In regard to stormwater management, several options have been discussed.. The proposal to place a dike across the southwest arm of Willow Pond (62-210) was looked at. Due to the filling prohibition in our rules, a DNR Protected Waters permit for this option would most likely be denied. Any stormwater treatment system will have to occur on site. The proposed Grit Chambers will provide limited sediment removal and will need cleaning several times a year. The clean-out material may also pose a problem; Grit Chamber sediment is sometimes considered hazardous waste. I understand that the city has requested that the school district look at other options for treating stormwater run- off . I am aware of several types of systems that could be incorporated that would reduce sediment and/or contaminants from reaching Willow Pond. Pond systems, infiltration systems, wetland systems, and filtering systems may be able to be incorporated in the present design. New stormwater treatment technology and the understanding of it all is constantly evolving. I am therefore unable to recommend one system over another. 2. Any activity below the Ordinary High Water Elevation (OHW), which alters the course, current, or cross-section of Willow Lake (#62-219), is under DNR jurisdiction and may require a DNR Protected Waters Permit. No official OHW has been established for this Public Water Wetland. AN EQUAL OPPORTUNITY EMPLOYER