03-14-1994 Council Packet - Laserfiche WebLink

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Ono G Bonefifoa mjDen W «c»ene ♦•t • jo^Oh C <nae<m P£ \A»rvin L Sorvata »c*^a/0 € Turner PE I Coo« *»E ’^►Hxras £ Noyr% ^'’E flbdcn G Scnunc?K PE SuMn M Ebefim C PA •Sfn«» CjnuAsn Mcniva»d A SanM PE A OofOOf^ PE RddefT ff PtefUtfie PE Pcnatd FoK«» P£ navid O Lc PE 4bc^ C Pui*«^ A I A ,e*y A BouftlDo PE iMarfe A Mjruon P£ v»icriae« T Raucmann P£ va n fM PE Thomas » Anoa*wn A > A Donald C auigjAX pe Thomas 6 Anguv PE ;smae< Maftnea PE M<nae'J'iL Agnes M Pr>g ajC P J Pyne PE Thomas Awenon PE lAchaci C ».yixh. •£ >ames Ma^amj PE je^ O ^*mcn P£ icoft J Argare*. PE V'^wiefh P Anderion ^E Var« 9 lloffSL PE Mart A Se^ PE Gar^ W Monen PE Dan<* J Eogenon PE A Pck Schmidt PE J Casvwei PE Marit O NA^athi PE Maes B Jensen P£ L P^Aip Grave* PE ICa<en L \^>men PE Garv D Ar SXC u E Todd Poster. P£ Keen ff 'wt pE Douglas j Benoe P£ 9vawvn O Gusunor PE Cec-ao O'vier PE Pam G Heuer •£ John P Goioer PE Charles A Enckson Leo M Paweiskv Kalian M Otson f EngePmrdt Bonestroo Rosene Andertik & Associates Engineers & Architects January 18, 1994 Ms. Jeanne A. Mabusth, Building and Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 Re: Tandem Properties File No. 139-1901 Dear Jeanne, We have reviewed the runoff and ponding calculations prepared by Coffin & Gronberg, Inc. for Tandem Properties. The property is located south of Watertown Road, to the west of Old Crystal Bay Road on the Coffin Parcel and to the east of Old Crystal Bay Road on the Dickey Parcel, in the North Half of Section 4. The calculations are acceptable, however, more information is necessary to evaluate the impacts on the downstream properties. We expect that many of the septic systems for this development will be mound systems. Several of the septic sites are less than 3 feet above the high water levels of the detention ponds. These sites are on the following lots: jam 2 1584 DICKEY PARCEL: Lot 5, alternate y I^t 6, alternate f COFFIN PARCEL: Lot 11, primary & alternate Lot 1, alternate ^ w These site locations should be modified to provide a 3 foot elevation above the high water level or the ponds should be modified. It appears that the ponds have been designed as "dry ponds" with no permanent standing water. This design should be reviewed by the Minnehaha Creek Watershed District. A baffle weir detail should be provided that shows how it will function without standing water. Also, each of the pond outlets on the Dickey parcel consist of two culverts at different elevations. No detail has been provided that shows the downstream end of the outlet. The elevated culvert will create a high potential for erosion and we recommend a drop manhole structure be added for control. The drainage calculations show in most cases that the future runoff will be less than the existing runoff. However, the runoff will be concentrated through culverts to the property lines which may have an impact on the downstream properties. The pond outlet at Lot 5 on the Coffin Parcel is directed out to the Luce Line Trail. An existing ditch runs easterly 2335 West Highway 36 • St. Paul, MN 55113 • 612-636-4600