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tflt Bonestroo MM Rosene AfKtertik& |\|| Associates EnglfiMf s 4 AixhItecU April 29.200S 2335 \West Highway 36 • St. Paul. MN 55113 Office. 651-636-4600 • Fax: 65I-636-I3II wwwixinestroo.com EXHIBIT F Ms. Janice Gundlach Planner CityofOrono Post Oflice Box 66 Ciystal Bay, MN S5323 ^AY •s» ClTYo,ms A/0 Re:1745 Fox Street File No. 0001 39-051 Plat No. 05-3097 Dear Janice: We have reviewed the site plans dated 4-7-OS for the proposed improvements to 1745 Fox Street The plans propose to subdivide an existing single family lot into a six lot single family subdivision. The existing lot is 57.91 acres of which 21.11 acres are dry. We have the following comments with regards to engineering matters: • The drainage calculations provided only address an area (8 acres) that is to be routed to the proposed pond. The city requires that storm water rate control be met for the entire site. In other words, post development flows for the entire site must not exceed predevelopment flows. Drainage calculations should be revised to cover the entire site, it may be necessary to incorporate some best management practices in addition to the pond to meet the rate control required. • The proposed pond needs to meet NURP standards. • Because the improvements will disturb more than one acre the flnal plans should include a detailed temporary and permanent erosion and sediment control plan as required for the NPDES permit. • The proposed retaining walls exceed 4-feet in height in some areas. A separate engineered design and detail submittal is required for all walls that are greater than 4-feet in height • The limits of the proposed grading for the retaining walls approaches some septic site locations. It is likely that the grading shown will impact the proposed septic sites on Lots 3 and 4. We recommend that the grading plan be revised or alternative septic sites be shown to eliminate any potential conflicts. • The driveway shown across Outlot A to serve Lot 6 should be configured to serve the existing guest house if this structure is to remain. The guest house access onto Fox Street should be removed and the ditch regraded. • We received a separate plan dated 4-14-05 proposing improvements to Fox Street to eliminate a sight distance issue. The plans should be revised to show the existing street grades and include existing vertical curve information so we can further analyze the necessity of any improvements to Fox Street. If you have any questions please call me at (651) 604-4863. Yours very truly. BONESTROO. ROSENE. ANDERLIK A ASSOCIATES. INC. Tom Kellou5-^ Cc: Oreg Gappa, City of Orono St. Paul. St. Cloud. Rochester. MN • Milwaukee. Wl • Chicago. IL \ AfflriMiJwB AciiofVMMal OppofUtlty Kwiil»yr imyto y Owiwtf