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- /i -rV <br />,.r-/4?>M.‘ <br />K * *v. <br />«*. <br />* V « '.^ <br />• »V ► ' • <br />>•* •- <br />♦ IW • •*• . / < <br />r-. <br />•* <br />• » tJ’» v-f . <br />. Vtr;.-.--. <br />•:^ . ** <br />< •; :• \-*C. VA ^ *• ,, <br />>:.V4 V.*' <br />V. <br />May 29, 1998 <br />• J . »m..^ <br />•i’Ji'i 01 <br />r-*Tv " .....^1, • V. ^ <br />VanDoren <br />Hazard <br />Stallings,Inc. <br />Architects ■ Engineers ■ Planners <br />Mr. Michael P. Gaffron <br />Senior Planning Coordinator <br />City of Orono <br />2750 Kelley Parkway <br />Orono, MN 55323 <br />Re: Preliminaiy Drainage Analysis <br />Tumham Toll Addition <br />Orono, MN <br />VHSJobNo. 98-302 <br />Dear Mr, Gaffiron: <br />Van Doren - Hazard - Stallings, Inc. has completed the Preliminary Drainage Analysis in <br />accordance with the Notice of Planning Commission Action dated April 29,1998. <br />As per discussions with Mr, Tom Kellogg of Bonestroo Rosene Anderlik & Associates, the <br />enclosed drainage analysis demonstrates that post development runoff can be maintained at <br />predevelopment levels via vegetated buffering. <br />Since the property owner is not proposing to develop any of the three lots at the present time, Mr. <br />Kellogg has indicated that utility and grading plans are not required at this time. Our drainage <br />analysis of each lot required that assumptions be made regarding the future development of each <br />lot. These assumptions are summarized as follows: <br />1.11,/VO sf is assumed as the area of developed impermeable surface (home, <br />driveway, etc.) for Block 1, Lot 1. <br />2. 7,000 sf is assumed as the area of developed impermeable surface (home, <br />driveway, etc.) for Block 2, Lot 1 and Block 3, Lot 1. <br />3. Block 1, Lot 1 has one drainage area which flows into the existing wetland. <br />4. Block 2, Lot 1 has one drainage area which flows to two existing wetlands. <br />5. Block 3, Lot 1 has two separate drainage areas, each of which flows to existing <br />drainage and utility easements. <br />The enclosed drainage analysis calculations demonstrates that post development runoff can be <br />maintained at predevelopment levels via vegetated buffering at the time of development. <br />Additionally, vegetated buffers will allow maintaining or reducing phosphorus loading into <br />existing ponds or wetlands. <br />! , <br />3030 Harbor Lane North <br />(612)553-1950 <br />Suite 102 Minneapolis, MN 55447-2175 <br />Fax:(612)553-1967