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<br /> Bonestroo,Rosene,Anderlik and Associates,Inc.is an Affirmative Action/Equal Opportunity Employer
<br /> Bonestroo and Employee Owned
<br /> Principals:Otto G.Bonestroo,P.E.• Marvin L.Sorvala,P.E.• Glenn R.Cook,P.E.• Robert G.Schunicht,P.E.
<br /> 0 Rosene Jerry A.Bourdon,P.E.
<br /> Anderlik & Senior Consultants:Robert W.Rosene,P.E. Joseph C.Anderlik,PE.•Richard E.Turner,P.E.• Susan M.Eberlin,C.P.A.
<br /> Associate Principals:Keith A.Gordon,P.E.•Robert R.Pfefferle,P.E.• Richard W.Foster,RE.• David O.Loskota,P.E.
<br /> Associates Mark A.Hanson,P.E.•Michael T.Rautmann,PE.• Ted K.Field,P.E.• Kenneth P.Anderson,P.E.• Mark R.Rolfs,P.E.-
<br /> David A.Bonestroo,M.B.A.• Sidney P Williamson,RE.,L.S.•Agnes M.Ring,M.B.A.•Allan Rick Schmidt,P.E.
<br /> En ineers&Architects Thomas W.Peterson,PE.• James R.Maland,PE.• Miles B.Jensen,P.E.• L.Phillip Gravel III,P.E.• Daniel J.Edgerton,P.E.
<br /> 9 Ismael Martinez,P.E.• Thomas A.Syfko,PE.• Sheldon J.Johnson• Dale A.Grove,P.E.• Thomas A.Roushar,P.E.
<br /> Robert J.Devery,PE.
<br /> December 24,2002 Offices:St.Paul,St.Cloud,Rochester and Willmar,MN• Milwaukee,WI• Chicago,IL
<br /> Website:www.bonestroo.corn
<br /> Mr.Lyle Oman
<br /> Building Inspector
<br /> City of Orono
<br /> Post Office Box 66
<br /> Crystal Bay,MN 55323 r�
<br /> Re: Robert Suess Pond Grading Inspection
<br /> BRA File No. 139-02-000 `-rio 'o
<br /> Dear Lyle:
<br /> On Thursday December 19, 2002 we inspected the pond on the Robert Suess property, Lot 8. Block 1,
<br /> Meadow Wood Pond. The pond discharges to an existing ditch along the west side of Truffula Trail.The ditch
<br /> then conveys flows northerly across Lot 7, Block 1 to an existing culvert under Truffula Trail. We have the
<br /> :'cilowin observations regarding engineering matters.
<br /> The fill placed between the south edge of the pond and the island hits been rainoved.
<br /> + Ponding calculations dated 4-13-00 submitted by Mark Gronberg show a 5.2 acre drainage arca reaching
<br /> the pond. The calculations provided indicate that pond discharges for the 1-year through 100-year storm
<br /> events will range between 0.44 cfs to 4.15 cfs (assuming the fill paced in the pond is removed as noted
<br /> above). I'he correspop.ding pond water elevations range i-etween 10233.57 to 1025.23. The polio
<br /> caiculations assume the pond is full of water at all times. The pond typically is not full and the water
<br /> elevations are generally lower than the outlet elevation of 1023.2. If the pond is not full of water when a -
<br /> storm event begins the pond outlet flows and water elevations will be less than those shown ir_ the
<br /> cal-ilations.
<br /> + ;he outlet flows and pond water elevations are acceptable and do not appear to pose a risk to neighboring:
<br /> properties.
<br /> • Fill placed between the pond outlet and the driveway on Lot 7,Block 1 is obstructing flows and should b:;
<br /> removed immediately.
<br /> + The downstream ditch to the north (Lot 7, Block 1) along the road appears to have a high point located
<br /> midway between the driveway and the culvert under the road. The ditch slows drainage to the north an"'
<br /> promotes infiltration of storm water, an environmentally friendly situation. A disadvantage to slowing
<br /> itoriii water and promoting infiltration is the iriabiiity to maintairi a manicured lawn during wet t..'nes Of
<br /> the year. Drainage across this neighboring property could be improved if the ditch was graded to remove
<br /> the high point. We would expect the removal of the ditch high point to create a ditch similar io the e-iL,
<br /> im.-nediately across the street on Lot 3, Block 1.
<br /> Please contact me at(651)604-4863 if you have any questions regarding this matter.
<br /> Yours very truly.
<br /> BONESTROO, ROSENE, ANDERLIK&ASSOCIATES, INC.
<br /> Tom Kellogg
<br /> Cc: Gress Gappa,City of Orono
<br /> 2335 West Highway 36 ■ St. Paul, MN 55113 ■ 651-636-4600 ■ Fax: 651-636-1311
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