Laserfiche WebLink
KALLIO ENGINEERING INC. <br /> . - - . . - . <br /> 10775 Poppitz Lane <br /> Chaska, MN 55318 <br /> April 26,200� <br /> Lyle Oman,Chief Building Official <br /> City of Orono,MN <br /> RE: 2665 Mapleridge Lane <br /> Orono,MN <br /> Dear Mr.Oman: <br /> On Apri126,200�,I inspected the ponding area at 2655 Mapleridge Lane and found it to be in <br /> conformance with the Stormwater Management Plans dated January 5,200�. <br /> Variations from the plans include the following: <br /> • The constructed pond does not contain wet detention. Wet detention was not criteria set <br /> by the city and has no impact on rate control. <br /> • The tile lines containing roof drainage were reduced from 6 inch to 4 inch as required,but <br /> not outlet into the upper pond. The tile lines outlet into the crushed rock near the lower <br /> dry pond. The roof drainage area is actually minimal with a ioo year flood of only o.5 cfs, <br /> therefore,the asbuilt conditions are acceptable in regards to stormwater management. <br /> However,the tile lines should be monitored for plugging as they begin to collect gutter <br /> debris. If plugging becomes a problem,outletting the 6 inch tile lines into the upper dry <br /> pond should resolve any issues. <br /> Variations from the plans were allowed,provided necessary storage volumes were met. I believe <br /> the dry detention ponds as constructed meet the criteria as set forth by the city. <br /> If you wish to discuss this further,please contact me. <br /> Sincerely, <br /> KALLIO ENGINEERING INC. <br /> �c�.�.t ���2-��'" <br /> Curt Kallio,P.E. <br /> Fax: 952-400-8492 � www.kallicenqineerinp.com � Phone: 952-448-5725 <br />