01-24-2005 Council Packet - Laserfiche WebLink

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Jan 13 2005 10:02 B0NE3TR00 ROSENE RNDERLiK 6516361311 p. 1 ^ i Bonestroo Rosene Anderlik & Associates Engineers & Architects ?r.v, WifSi HighWHy 36 - St P.iul. MN ‘jSlia Office: 65l-636-'>600 • Fax: 651*636*1311 wwwhonestroo.com January 13, 2005 Mike GafTron Planning Director City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: Creeksidc File No. 1394)5-000 Plat No. 04-3016 Dear Mike: We have reviewed the revised utility, street, grading, drainage and erosion control plans dated 1-3-05 for the proposed seven tot Creeksidc subdivision. The site is located ea.st of South Brown Road, .soulli of Long Lake and north of the Luce Line trail in the northeast cjuarlcr of Section 3. We have the following comments in regards to engineering matters. 1. Acccss/SCreets: A geotechnical rcjxjrl, R-valuc recommendation and pavement design should be submitted for review and approval. The proposed trail between Lois 2 and 3 shows proposed grades in excess of 40%. These proposed grades are not only a safety concern but are likely to be an erosion concern. The proposed wood chip surfacing will likely end up in the creek after a rain event. Tlie trait plan should be revised to reduce the grades and implement permanent erosion control measures. 2. Grading and Erosion Control: The plans have been rcvi.scd so that all lots will be custom graded at the time the home is constructed. This will present a problem with respect to drainage and construction issues. It is likely that home construction will begin and be completed at different times on each of the lots. We previously recommended that the sites be graded with side yard swales centered on the lot lines to convey storm water to the rear of the lots to the extent possible. Tliis will be difficult to accomplish if each lot is graded independently from the others. We would strongly ircommcnd that the city encourage the applicant to grade all building sites now rather than in a piecemeal fashion. Thi.s will require submitting a revised grading plan for review and approval. We feel this will go a long way in minimizing drainage issues and reducing the inick iraffic during home construction. Once the site is graded the applicant should provide an overall as-built grading survey to the city for review and approval prior to the issuance of any building permits. Wc further recommend that an as-built grading survey for each lot be submitted and approved prior to the issuance of o certificate of occupancy. This would scrv'c as a check to verify that the drainage was not altered during the home construction or final lot grading. The survey should include contours that extend at least 50-fect beyond all lot lines. We recommend that the westerly portions of Lots 1 and 2 be graded to drain southerly to the creek. This grading should be done prior to the proposed tree installation. 3. Drainage: Please sec the attached comments from Lance Hoff regarding drainage issues. 4. Financial Guarantee: Wc hove estimated the cost for site improvements to be $307,465 and have attached a copy of the estimate to this report. The applicant should provide a financial guarantee for 150% of this amount or $461,198 to the city prior to any work on site. The financial guarantee can be reduced periodically as work is completed and accepted but should never be reduced below $20,000 uniil all work is completed and accepted. . f V • St. Pciul. St. Cloud, Rocheiler, Wlflmar. MN • Milwaukee. Wl • Chicago. **L Action/E^«i OMportunily Employer «nd rmplrty#*r Owvn^.1