02-14-1994 Council Packet - Laserfiche WebLink

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X 1 0 : ^ -4 1 ^ BONESTROO Ir. 0 0 >- SOCX^^TES R . Bonestroo ffg la Anderlik & Associates Engineers & Architects January 7, 1994 • lltTn.Hr A^rvn M find A li I*II 1*1 Vet* A ff J ^yni* Pk 1 1*1 C 1*1 Ih40^* ^ IVrteflr. PI thO*nj\ W Pf 1 pf .M.HVWI 1 ^irvjU r|W 1’C^CK Ff .V«Hrwe«C lyrcaM l»*ff I)#v«in lewiu. fC Jjmtl « f f 1 Ptu iiiyn* r| ♦.ITfWl M C-**** f't r.AIA 0 feiUHh PI Knii V Y.,^. t*r Nufr-k 1*1 •«rr A |li4tftjLAI. fl Von J Ar^ri PI I>»iiAi*. * iv*<^ i*t Marl A MjiMifi. Pf 1 • t PI '■lUn .M Mv*rlai i i*a Vi t P.xjtmjr.*. rt « it#v pf Cr« III • -pf fed r 1 rill PP U#1i A PI P#«i< r. 1p| Itii4iwi* P AnrlrfWt.AlA Cwy w Miinrf« PI ItJftt 1' 1 DjniH J PI I ll.UIP^ A J ,4 Ivwi 1 A»%pt\A t«U Pf IfiiM PA.ty J Cr.^ Pf 1 L«il.lil M » 1-4 •» r I m Utif 0 n 1 1 i Ms. Jeanne A. Mabusth, Building and Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 Re: ITiree Star Trucking Subdivision File No. 139-1843 Dear Jeanne, We have reviewed the revised preliminaiy jilal and grading plan, and runoff/ponding calculations submitted for the Three Star Trucking subdivision located north of Watertown Road in the Southeast Quarter of the Southca.st Quarter of Section 33. We recommend several modifications to the plan and calculntion.s. As noted in our previous letter dated September 12, 1993, the drainage swale on Lot I must be lowered to control the runoff within the subdivision. This change should be shown on the grading plan. The drainage for this property is an important issue due to the fact that much of the runoff currently drains easterly through the developed properties in the Daniels Long Lake Heights Addition. We recommend tJiat additional storage volume be provided in the pond on Lot 4 to reduce the outlet flows. Both the pond bottom and outlet could be lowered up to two feet if the culvert is extended to the cast. Also, the easterly property, existing drainage swale and existing culverts must be further investigated to determine the drainage capacity available downstream. Tlie e.xisting drainage swale and culverts may need to be improved at this time to prevent future property damage downstream. Further, we recommend that the City obtain a drainage easement over the swale. This easement should be either granted to the City or purchased by the developer. Tlicsc property owners should be contacted to discuss the project. A large portion of the pond on Lot 4 is shown within the wooden area. These trees will need to be removed unless the pond location i.s changed. The pond outlet that consists of both a 15 inch and a 36 inch culvert i.s acceptable, however, no detail has been provided that shows the downstream end. Tlic elevated 36 inch culvert will create a high potential for erosion and we recommend a drop manhole structure be added for control. The septic sites, house site and pond shown on Lot 4 may be rearranged if necessary to save the wooded area, however, testing for additional septic sites will need to be delayed