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Met* 07 2004 7:30RM HP LASERJET 3330 • •i/U Bonestroo Rosene ■ Anderlik & Associates Cn9ln«ar* & Architacti May 7. 2004 Mike Otifron Planning Director City of Orono Post Office Box 66 Crystal Bay. MN 33323 Re: Creekside File No. 139-04-000 Plat No. 04-3016 2335 We»t Highway 36 • St Prul, MN 55113 Office: 651-636-4600 • Fax: 651-636-1311 wwwbonestroo.com p. X Dear Mike: We have reviewed the preliminary grading, drainage and erosion control plans for the proposed seven lot Creekside subdivision. The site is located east of South Brown Road, south of Long Lake and north of the Luce Line trail in the northeast quarter of Section 3. We have the following comments m regards to engineenng matters. 1. Acccss/Streets: An application to subdivide this site w.ts reviewed in 1999. At that time access to the site from South Brown Road was across an casement to the property. It appears the acces.s to this site is across the same easement shown m the 1999 application. Our position was then and is today ili.it access to the property should be platted as part of the subdivision and not across an casement. The platted access nght- of-way should be a minimum of 50-fcct in width to meet City standards for a private sticct. Seven properties will use this roadway for acce.«;s onto South Brown Road. The proposed typical street section shows a 24 -foot urban street with concrete curb and gutter. City code requirc.s a minimum paved street width of 28-fcct for aprivate road serving seven units. Staff and council should review and determine what street width ia appropriate for this site. Final plans should include plan and profile views of the street. Horizontal and vertical alignments should meet the minimum standards specified in the code (30 mph design speed, maximum .street grade of 12%). A typical street section should be included in tlic final plan act. The final submittal should include a geotechnical report, R-value recommendation and pavement design. Hennepin County should review and approve the proposed access to the site. 2. Grading: The erosion control fence detail should be revised to allow only steel t-posls ;uid should specify machine sliced installation of die fence. Wc will provide detailed comments regarding the erosion control plan with the final plat submittal. The final grading plan should identify first floor a:id lowest floor elevations for all proposed and existing homes. Additional erosion control will be nccc.ssary during coiustruclion of the houses. 3. Drainage: The draft version of the City ’s' Comprehensive Storm Water Management Plan (SWMP) shows that the site lies within the Tanager Lake drainage distnci. Long Lake Creek, a Mn DNR protected waterway, flows through tJic site. Plans should be submitted to the Mn UNR and the Minnehaha Creek W.atcrshcd District (MCWD) for review and appros-al. The plans should identify the OHW and flood plain boundaries for I tiiig Lake Creek. The proposed pond should meet NURP standards. The final plans should include detailed pond design showing a 10:1 aquatic bench 10-fcct wide at the pond NWL. 'Iho pond design should also include u concrete outlet structuie that provides l-foot of slamming to remove lloaublcs and debris. Storm sewer design and calculatiwis including outlet structure details should be provided fur review. Final plans should incorporate Best Maiiagcmsat Practices (BMP's) in all areas where storm water c:mnot be routed directly to a pond. The rate control calculations provided are acceptable. • St. Paul. St Cloud. Rocbeiter. Willmar, MN • Milwaukee, Wl • Chicago. IL AffV«4«tlv« Action/Cquai Opportunity Impfoytr snd tntployeo Omncit I