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Planning Commission Report Silver Lake Commons Development Review Planning Case No. 487-97 July 16, 1997 Page 2 • Analysis: `rainage and Ponding: The drainage proposal is to create a detention pond at the southeast end of the site, which then would feed water to the Highway 10 ditch. The ditch flows north at this point, and water then goes through a culvert under Highway 10 to the D.W. Jones property and wetland. While there has been some discussion with the applicant about piping the water to the wetland on the D.W. Jones property and creating a detention pond (for water quality purposes) on that property in cooperation with the property owner, it has been established that there is sufficient room on site to accommodate the required ponding if this option is not possible. A meeting between the parties has been scheduled but will occur after this report was written. The revised drainage plan and stormwater calculations provided by the applicant on July 1, 1997 were forwarded to Rocky Keehn at SEH, Inc., the City's engineer. According to Mr. Keehn, this drainage plan better addresses most of the issues raised in his review of the applicants' earlier submittal. These issues were (1) the possibility of flooding occurring on the property north of the site due to the positioning of the buildings, (2) the need to address the existing bituminous swale which carries water from Eastwood Road acxross the property, (3) the absence of detailed drainage calculations, and (4) the lack of contours for the proposed pond. • The first issue is tentatively resolved by regrading a portion of the property to the north to form a swale that routes runoff around the parking area to the open area which then slopes toward the pond at the southeast corner of the site. The applicants, however, will need to obtain a permanent drainage easement over the regraded area to ensure its function in perpetuity. The second issue is resolved by the addition of a new swale to replace the existing swale on the property that routes runoff from Eastwood Road into the Highway 10 drainage ditch. This swale is not on-site, however, and as such, permission will need to be obtained from Ramsey County, whose right of way it crosses, and Mounds View's Public Works Department. The ::. ..K third issue is resolved by the provision of the detailed drainage calculations which have been reviewed and F '�: ::' �:.:.;.moi: ... found acceptable by Mr. Keehn. The Iast issue is resolved bythe addition of contours to the and which — l � ,� : •- reveal a 2.5 to 1 slope--well under the maximum of 10 to 1 as suggested by Mr. Keehn. The pond depth is shown at four feet, also as suggested by Mr. Keehn. 'a Mr. Keehn raised two additional concerns after `14" reviewing the revised drainage plans. First, the inlet - .. , .. . and outlet to the proposed pond in the southeast corner - "�' 2'.cc„g» of the site are too close together. This can be remedied Figure 1 Proposed inlet relocation by sloping the stalls toward the townhouse units and • relocating the curb cut to the north corner of the parking stalls as indicated in Figure 1 above.