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8onestnom Rosene. Anderllk and Assochl Inc is an Affirmative Actlon/Equal opporturdty Employer Bonestroo PrInclparrOtto G. Bonestroo. P.E.+ Joseph C. Anderiik. RE. • Marvin L Sorvala. P.E. - Rosene Richard E Turner. RE. • Glenn R. Cook. RE. • Robert G. Schunlcht. RE + Jerry A. Bourdon. P.E. • Robert W. Rosen. P.E. and Susan M. Eberlln. C.P.A.. Senior Consultants ® Robert P. E. AnderlilC & Associate Principals. Howard A. Sanford. RE • Keith A. Gordon. P.E • R. Pfefferle, Richard W. Foster, P.E. ■ David O. Loskota. P.E. • Robert C. Russek. AJ.A • Mark A. Hanson, P.E. Michael T. Rautmanrt, P.E. • Ted KJReld. P.E. + Kenneth P. Anderson. P.E. + Mark R. Rolls, PE + AssoAssociatestes Sidney P. winiamson. P.E., LS. • Robert K Kotsmlth ■ Agnes M. Ring + Michael P.Rau, P.E • Allan Rick Schmidt. P.E. Engineers & Architects Offices: St Paul. Rochester. Willmar and St. Cloud MN • Milwaukee. WI Websim www.bonestroo.com March 9, 1999 Elizabeth VanZ,omdren City Planner/Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: Carriage Hill' Subdivision File No. 139-2467 Dear Liz: We have reviewed the preliminary plat for the proposed six lot Carriage Hill subdivision. The site is located.west of Brown Road South (C.R. 146), east of Willow Drive and south of the Webber Hills neighborhood in the northwest quarter of Section 10. We have the following comments in regards to engineering matters. 1. Access: The proposed access location for Carriage Lane appears acceptable. We recommend that Carriage Lane be constructed to a 24-foot paved width in accordance with City standards for a private street serving 3 to 6 units. We also recommend that Carriage Lane be an urban street section with concrete curb and gutter and storm sewer. The City should review and determine whether the 150-foot driveway across Outlot B to Lot 2 is acceptable. Final plans should include a typical street section for both Carriage Lane and the driveway to Lot 1. Access to Lot 1 along King Street is adjacent to an existing driveway serving the property fo •the north. Does it make sense to have two separate driveways side by side or would a combined access be more appropriate? The proposed .plan for the access to Lot 1 appears to require some extensive grading. Construction easements or retaining walls may be required to construct this access. It also. appears that the construction of this access will impact the wetland and wetland buffer. Plans should be submitted to the Minnehaha Creek Watershed District (MCWD) for their review. Geotechnical recommendations and street design should be provided for our review. 2. Grading: A grading and erosion control plan for the entire site should be submitted for review. Erosion control measures should be in place prior to any grading, particularly along the wetland and ponding area. Additional erosion control will be needed during construction of the houses and septic systems. Drainage: As stated in # i above, we recommend that storm sewer should be constructed to route storm flows from the street to the pond. Based on the drainage calculations submitted, it appears that the existing 12-inch CMP under Willow Drive will remain in place. The CMP will act in conjunction with the proposed 15-inch CMP. We recommend that all storm pipes be RCP rather than CMP. We recommend that the pond have an outlet structure that provides 1-foot of skimming to remove floatables and debris. ,Some Type of permanent erosion control measures should be installed downstream from the pond to prevent sedimentation in French Lake. We have attached additional comments from our water resources department regarding water quantity and quality. 4. Utilities: City sewer exists just south of the site on Willow Drive. The City should review and determine whether they intend to ever provide sewer service to this area. 5. Easements: Final platting should include 33 feet of dedicated right-of-way for C.R. 146 and 66 feet of dedicated right-of-way for Willow Drive. Does Outlot A have any impact on access to the lot south of Willow Drive? The drainage and utility easements shown appear to be acceptable. Additional easements may be required if sanitary sewer is provided. 6. Financial Guarantee: When the plans have been completed we will prepare an estimate of the total cost for the site improvements to determine the amount of the financial guarantee required. 2335 West Highway 36 ■ St. Paul, MN 55113 11 651-636-4600 m Fax: 651-636-1311