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Nov 03 2004 10i23 BONESTROO ROSENE RNDERLIK 6516361311 P.l Bonestroo Rosene Anderiik& Associates Engineers & Architects 2335 west Highway 36 • St. Paul. MN 55113 orrice: 65I-636-4600 • Fax; 6SI-636-13II wwwJ)onestroo.com EXHIBIT D Noveniber 3,2004 Ms. Janice Gtmdlacb Planner City'ofOrono Post OCBce Box 66 Ciystal Bay, MN SS323 4475 Forest Lake Landing File No. 139-04-000 Plat No. 04-3054 Dear Janice; We have reviewed die revised site plan dated 10-28-04 for the proposed iraproveoients to 4475 Forest Lake Landing. The proposed inoproveinents include site grading, removing an existing residence and constructing a new home. The topography of this site makes drainage issues a challenge to deal with effectively. We have the following comments with rega^ to engineering matters: • The proposed plsuis shown retaining walls along the northwest and southeast lot lines. The walls are shown constructed on the lot lines. It is unclear how these walls can be constructed without easements from the neighboring properties. The city should review and comment on required set backs for retaining walls (5-feet?). e The stated purpose of the retaining wall along the southeast lot line is to channel storm water to the street In general it is iwt a sound engineering practice to direct water to the base of a retaining wall. We recommend that a deuiled retaining wall design be submitted that shows how the base of the wall will be protected from the water undermining it. The detail should also address proposed permanent erosion control measures. • The final plans should identify proposed top and bottom of retaining wall elevations as well as wall materials. • It appears that storm water will be directed from the southwest to the northeast onto the southwest side of the pool deck. Plans should be revised to direct storm water around the pool deck. • The driveway is shown at a 10% grade. This is the maximum recomnended driveway grade and should not be exceeded when constructed. • The proposed slopes south and east of the driveway are shown at 2:1. The maximum recommended slope for maintenance (mowing) reasons is 3:1. We reconunend that the grading plan be revised to reduce all proposed slopes to a 3:1 maxiiruun. • The proposed silt fence should be the heavy duty type with steel t-posts. A note should be added to the plain stating that the erosion and sediment controls are to be installed, iiupectcd and approved by the city prior to any work on aite. If you have any questions please call roe at (651) 604-4863. Yours very truly, BONESTROO, ROSENE, ANDERLDC & ASSOCIATES, INC. Tom Kellogg Co: Greg Gappa, CityofOrono Bruce Vang, Ci^ of Otono • St. Paul. St. Cloud. Rochester, Willmar. MN • Milwaukee, Wl • Chicago, IL Afflrmjrlv* ActJon/ff<|ual Opportunity Cmploytf fmployoo Ournotf