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08/08/97 FRI 14:14 FAX 612 490 2150 SEH Q003 ,58,1 • MEMORANDUM ■ST.PAUL,MN 0 MINNEAPOLIS, MN 0 ST.CLOUD, MN ❑CHIPPEWA FALLS,WI ❑MADISON,WI D LAKE COUNTY,IN TO: Jim Ericson, City of Mounds View FROM: Rocky J. Keehn ry DATE: August 7, 1997 RE: Review of McDonalds, City Planning Case 500-97, SEH File No. AMOUND9701.00 Our review was based on a set of plans received by the City on July 25, 1997. The grading and drainage plan reviewed was printed on July 23, 1997. Based on this set of plans,the proposed building relocation will not alter the current impervious and pervious surface area amounts that currently exist on the site. Therefore, the total runoff from the site should not change with the reconstruction. Our concern is not the amount of runoff, but how the drainage patterns for the proposed runoff may be altered since there are three discharge locations of runoff from the site. The three discharge locations are to a curb-cut on the east side of the parking lot,the south entrances to the parking lot and a catch basin at the end of the drive thru. Based on the information provided for our review,it cannot be determined exactly where the existing and proposed 110 runoff drains from the site. Also,flow from the catch basin at the current drive thru is not shown on the plans. To document the drainage patterns, the developer needs to submit a drainage map which shows where all the runoff from the site will go for both the existing conditions and for the proposed. If the drainage patterns differ from those that currently exist, the developer's engineer will need to calculate the expected changes in flow rates to the downstream drainage systems and determine if these changes will cause any adverse impacts. All maps and calculations will need to be submitted for our review. The applicant will also need a Rice Creek Watershed District(RCWD) permit if the area is more than 2.5 acres or within 1000 feet of a DNR protected wetland. Due to its location near Rice Creek, the applicant should check to see if a RCWD permit is required. If a permit is required,RCWD will likely encourage the developer to construct measures to improve the water quality of runoff from the site. Based oiour review,it appears dne to site cnnstraints that an above ground water quality system is unfeasible. An underground system could be built, but since it would be a private system,maintenance would be a problem. Therefore, we would recommend that for this site no water quality treatment methods be required as part of the reconstruction. In order to complete our review,the developer must submit the following: 1. Provide the location of the discharge from the catch basin at the end of the current drive-thru 2. Drainage Map-Existing Conditions 3. Drainage Map-Proposed Conditions 4. Drainage calculations if the existing and proposed differ 5. RCWD permit applications if applicable or if not applicable please indicate why If you have any questions or if I may be of further service please call me at 490-2026. • RJK/rjk/MER S:\WA7EMANONTECH ROCKx\WP'MEMOSWOUNDVWJES