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Home My WebLink About1999-05-13 BRAA Ltr to OPH Re Preliminary Grading Plan ReviewBonestroo, Rosene, Anderlik and Associates, affirmative ActionlEqual Opportunity Employer Principals: Otto G. Bonestroo, PE. a Joseph C. Ar. jik. PE. a Marvin L. Sorvala, RE. 4 Glenn R. Cook., RE. a Robert G. Schunicht, PE. Q Jerry A. Bourdon, PE. Robert W. Rosene, P.E., Richard E. Turner, PE. and Susan M. Eberlin, C.P.A., Senior Consultants Associate Principals: Howard A. Sanford, PE. s Keith A. Gordon, PE. a Robert R. Pfefferle, PE. Richard W. Foster, PE. a David D. Loskota, PE. a Robert C. Russek, A.I.A. a Mark A. Hanson, P.E. Michael T. Rautmann, RE. 0 Ted K.Field, PE. a Kenneth P Anderson, P.E. a Mark R. Rolfs, PE. Sidney P Williamson, PE., L.S. a Robert F. Kotsmith o Agnes M. Ring a Allan Rick Schmidt, PE. Offices: St. Paul, Rochester, Willmar and St. Cloud, MN a Milwaukee, W1 Website: www.bonestroo.com May 13, 1999 Mr. Thomas M. Melena, Administrator City of Oak Park Heights 14168 N. 57"' Street, P.O. Box 2007 Oak Park Heights, MN 55082 -2007 Re: Boutwells Landing /Valley Senior Service Alliance Preliminary Grading Plan Review Our File No. 55 -98 -805 Dear Mr. Melena: We have reviewed the preliminary grading plan for the Boutwells LandingNalley Senior Service Alliance development as submitted by Ulteig Engineers, Inc. and have the following comments /recommendations : 1. Enlarge Pond B and modify Pond C, Pond D and Wetland 13 as indicated in the attached May 11, 1999 memo. In addition, the enlargement of Pond B should take place on the north end of the pond where the 18" stub from 58 Street /Outlot A will most - likely enter, but should not move any closer to 58"' Street. 2. The typical pond liner section for Ponds A, B, C & D (Section A-A) should show the 10' wide aquatic bench with I' of slope. The plan view contours appear to incorporate this bench. Also, label top of berm and overflow elevations on the plan. 3. Provide maintenance access to any "isolated" structures and pipe, such as the outlets from Ponds B, C and D. This can be accomplished by providing sufficient overland grades for maintenance vehicles (need not be paved or gravel). 4. Several other issues relating to specifics of pipe sizes and /or slopes and connecting the wetlands along the westerly portion of the property (Wetland Complex 14) will need to be addressed in the final storm sewer design, but do not affect the proposed grading plan. 2335 'Test Highway 36 n St. Paul, MN 55113 a 651-636-4600 ® fax: 651 -636 -1311 11r. Thomas M Melena, Administrator Cit of Oak Park Hei Pa 2 The preliminar g radin g plan for the Boutwells Landin Senior Service Alliance development is in g eneral a with the Cit Municipal Code. Approval for this plan is contin upon the implementation of the comments/recommendations noted above. If y ou have an q uestions re this review, please call me at (651) 604-4815. Ver trul y ours, BONESTROO, ROSEATE, ANDERLIK & ASSOCIATES, INC. Dennis M. Postler Attachment cc: Jud Holst, Finance Director (Interim Cit Administrator) Jim Butler, Buildin Official Kris Danielson, Communit Development Director Ja Johnson, Public Works Director Charles F. Melcher, Utei En Inc. Joe Anderlik, BRAA 5598805gradingreview Protect Name,, Boutwells Landing To: Charlie Melcher, Ulteig Engineers Inc, o +'110 Re: Pond grading recommendations Remarks: Client: city of Oak Park heights F11eNo4 &tgm ct 6 — Date-, May 11, 1999 This memo excerpts comments from our 4/22199 and 4129 99 memos regarding Boutwell's Landing. These specific excerpts regard pond grading, - 4 Acceptable with grading shown. Assuming that an 18 -inch stub is provided for outlot A (which encompasses approximately 11 acres of future commercial development north of 58"' Street), then outlot A will require approximately 2 ac-ft of flood storage to reduce 100 -year peak flow to that stub's capacity, which we estimate at approximately 10 cfs. This could be provided in the form of a dry pond north of 8' Street. This flow should be routed through pond B to take advantage of the water quality treatment volume provided there. This wet volume or dead storage is sufficient to handle flow from outlot A and treat to the extent proposed by the AASWMP, The additional volume from outlot A requires flood storage expansion of pond B. We recommend pond E3 be expanded according to the following: contour Pro osed Recommendation 934.0' 0.95 acre 1.4 acre 935,0` 1.11 acre 1.7 acre BOn estroo, Rosen e, Andertik and Associates, Inc St. Paul office: Milwaukee Dtflce: Rochester Cfflce: Wltlmar office: SL Cloud Cfflca: 2335 West Highwa 36 1516 Wes[ Mequon Road 2222 Hwy 52 Norte 205 5th Street SW 2ooa am St. Narth St. Paul, MN 63113 Mequon, trail 53092 Rochester. MN 55001 Willmar, Mho 66201 5t. Cloud. MN 56303 Phone. 612.436 -4603 Phone 414 -2A1 -x465 Phone: 507.282.2100 Phone: 320 -214 -9557 Phone: 320 - 251 -4553 FaX 612 - 636.1311 'Fax: AiA- 2414901 Fix: 607. 282.3100 Fax 320 - 214-9488 Fax, 320 - 251.6252 EON E ST ROO R S EN E AN D E "' T K 6 651 6361311 05/14/99 09 5 : 05/05 NO : 465 We also recommend a 937.0' riprap overflow and top of berm at 933.0'. With the single 30-inch pipe proposed previously and this pond expansion, we calculate a HWL of 936.7' and a 100 -year peak flow of 24.2 cfs. Ponds C and D In order to avoid general overflow across pond berms for the design rainfall event and fully utilize the proposed outlet pipes, we recommend the following revisions to the design of ponds C and 0: 1. Raise the top of berm on both ponds to 934.0'. 2. Provide two 14 to 15-foot riprap overflows at 933.0'. One would allow overflow from pond 0 into wetland complex 1 4. The other would allow overflow from pond C into wetland 13. 3. Pond areas are otherwise sufficient. 1 = :� l s We recommend against the creation of islands within this wetland and our calculations (detailed in previous memos) assume that these will not be constructed. If you have any questions regarding the contents of this memo please call me at (651) 694 -4740. C c - Joe Anderlik, l3RAA Dennis Postler, B RAA Bonestroo, Rosane, Andarrlik and Assoclsfes, Inc. St. Paul office: Milwaukee O fica: Rochester Office: Willmar office: OL Cloud Office: 2335 West Highway 36 1510 West Mequon Road 2222 Hwy 52 Nara'+ 205 5th street 5W 2006 8th St, North 5t. PRu1, MN 53113 Mequon, W1 53092 Rochester, MN 55601 W14mar. MN 56201 31. Cloud, MN 56303 Pnanu; 612.638 -4800 Phona: 414 -241 -4488 Phone: 507 - 282 -2100 Phone: 320.21 4 -9557 phone: 320 -251 - 4 5 53- Fax: 612-636.1311 Fax: 41 -z41 -4001 F ax - , 507- 292 -3100 Fax: 320.2 Fax: 320.251 - $252