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Interim Use Permit 2011-01 Recording Transmittal 01-28-2011CITY OF CHANHASSEN PLANNING DEPARTMENT 7700 Market Boulevard P.O. Box 147 CHANHASSEN, MN 55317 (952) 227 -1100 FAX (952) 227 -1110 TO: Campbell Knutson, PA 317 Eagandale Office Center 1380 Corporate Center Curve Eagan, MN 55121 LETTER OF TRANSMITTAL DATE JOB NO. 1/28/11 1 2011-01 ATTENTION Sue Nelson RE: D ocumen t Recording WE ARE SENDING YOU ® Attached ❑ Under separate cover via the following items: ❑ Shop drawings ❑ Prints ❑ Plans ❑ Samples ❑ Specifications ❑ Copy of letter ❑ Change Order ❑ Pay Request ❑ COPIES DATE NO. DESCRIPTION 1 1/24/11 11 -01 Interim Use Permit 2011 -01 Minnetonka Middle School West IUP ❑ FORBIDS DUE For Recording ❑ PRINTS RETURNED AFTER LOAN TO US THESE ARE TRANSMITTED as checked below: ❑ For approval ❑ For your use ❑ As requested ❑ For review and comment ❑ FORBIDS DUE REMARKS ❑ Approved as submitted ❑ Resubmit ❑ Approved as noted ❑ Submit ❑ Returned for corrections ❑ Return ® For Recording ❑ PRINTS RETURNED AFTER LOAN TO US COPY TO: Cliff Buhman, Inspec Mike Condon, Minnetonka Schools SIG If enclosures are not as noted, kindly notify us at once. copies for approval copies for distribution corrected prints CITY OF CHANHASSEN CARVER AND HENNEPIN COUNTIES, MINNESOTA INTERIM USE PERMIT #2011 -01 1. Permit Subject to the terms and conditions set forth herein, the City of Chanhassen hereby grants an interim use permit for the following use: Interim Use Permit to allow site grading for tennis courts based on the plans prepared for the Minnetonka Middle School West. 2. Propert X . The permit is for property situated in the City of Chanhassen, Carver County, Minnesota, and legally described as follows: LEGAL DESCRIPTION The Southwest Quarter (SW 1/4) of the Northwest Quarter (NW 1/4) of Section Three (3), Township One Hundred Sixteen (116), Range Twenty Three (23) West, according to the U. S. Government Survey thereof, excepting therefrom the 35/100ths acres conveyed by deed recorded in the office of the Register of Deeds of Garver County, Minnesota, in Book 8 of Heeds, page 400, and that part thereof conveyed by deed recorded in the office of the Register of Deeds of Carver County, Minnesota, in Book 41 of Deeds, page 322, and sub to the right, title and interest of the State of Minnesota in that strip of land conveyed by deed recorded in the office of the Register of Deeds of Garver County, Minnesota, in Book 33 of Deeds, page 25. Also that part of Lot E. Bardwell Acres, not conveyed by said deed recorded in the office of the Register of (deeds of Corver County, Minnesota, in Book 41 of Deeds, page 322. Sub*t to o permanent easement for roadway purposes as recorded in the office of the Register of heeds of Carver County, Minnesota, in Book 64 of Deeds, page 32. 3. Conditions The permit is issued subject to plans dated December 3, 2010 prepared by Inspec, and the following conditions: a. Adequate sediment and erosion control practices must be installed prior to any earth - disturbing activities. b. All silt fence shall use metal t -posts and shall be consistent with City Detail Plate No. 5300. Include detail on Sheet 5. c. Rock construction entrance locations shall be shown on the plan and should be placed such that construction traffic does not cross the proposed infiltration areas. Rock construction entrances shall be consistent with City Detail Plate No. 5301. Include detail on Sheet 5. d. Infiltration areas shall be protected from sediment deposition and compaction resulting from construction equipment throughout construction. This must be noted on the plans along with all other areas to be protected. e. Category 3 erosion control blanket shall be used on all disturbed slopes with positive flow to the pond unless sod is to be placed and staked. The applicant is responsible for procurement of the NPDES General Permit to Discharge Stormwater Associated with Construction Activity prior to any earth- disturbing activities. A full SWPPP will need to be prepared and submitted to the City for review and approval prior to any earth- disturbing activities. The SWPPP must include all components identified in Parts III and IV of the permit. g. Redundant erosion control measures shall be included at the two new inlets to the pond. Floating silt curtain should be used at the more southerly inlet but a second line of silt fence may be adequate at the other new inlet. h. The infiltration design and maintenance shall be consistent with the 2008 Minnesota Stormwater Manual; in particular Chapter 12 and Appendix D. i. Protection must be provided to assure that construction equipment is not tracked over the proposed infiltration areas, materials are not stockpiled in these areas and sediment deposition does not occur in these areas. This is most commonly accomplished through the use of silt fence. Further, this should be noted on the plan set, in the SWPPP and within the project specifications manual. j. Infiltration features must be separated from the ground water by a minimum of three feet. Provide boring data to confirm this separation. k. As the infiltrometer tests were performed approximately 60 feet west of the proposed infiltration area and the infiltration rates are under the optimal conditions, and likely to decline over time, a margin of safety shall be built into the design to account for a diminished infiltration. 1. To assure that the area drains in 48 hours or less, the system shall be designed with an underdrain and coarse aggregate storage as depicted in Appendix D of the Minnesota Stormwater Manual — ` Bioretention /Infiltration/Filtration Facility ", page 723 of 885. This would likely satisfy the above condition. m. CBMH 1 shall be moved northerly on the site and lowered so that the rim elevation is below 1060 feet. n. The applicant shall relocate to proposed drain tile outlet for the four most easterly tennis courts. The new outlet shall be between the most southerly court and the next most southerly court. This shall then be connected to CBMH 2 and the outlet for this manhole shall then be sized accordingly. o. A stable emergency overflow shall be provided from the easterly basin to the pond. p. The applicant shall demonstrate how the filtration swales are to be vegetated. At a minimum, fescues and/or other deep- rooted grasses should be used to promote infiltration. q. The new outlet elevations are shown to be 1046 feet. It appears that the ordinary high water level (OHW) is at 1045.4 and the normal water level (NWL) is at an unknown elevation but likely at or around 1043.5. The newly proposed outlet shall be set at the NWL. The applicant or their consulting engineer shall develop an operations and maintenance manual for the infiltration /filtration features and that this includes some type of vegetative filter to provide pretreatment of the water entering the system. s. The applicant shall provide a security in the amount of $4,000 to guarantee erosion control. t. The applicant shall verify that the tennis courts are outside any easements and meet the 15 foot side yard setback. 4. Termination of Permit The City may revoke the permit following a public hearing for violation of the terms of this permit. 5. Lapse If within one year of the issuance of this permit the authorized construction has not been substantially completed or the use commenced, this permit shall lapse, unless an extension is granted in accordance with the Chanhassen Zoning Ordinance. 6. Criminal Penalty Violation of the terms of this conditional use permit is a criminal misdemeanor. Dated: January 24, 2011 CITY OF CHANHASSEN B : Y Thom sAA.. Furlong, Mayor By: odd Gerhardt, City Manager STATE OF MINNESOTA ) ( ss COUNTY OF CARVER ) The foregoing instrument was acknowledged before me this ' 7 of q a-��' 2011, by Thomas A. Furlong, Mayor and Todd Gerhardt, City Manager, of the Cit )Uf Chanhassen a Minnesota municipal corporation, on behalf of the corporation and pursuant to authority granted by its City Council. a"6� XM Zac-06�� No ff Pubficd win nnrv�nns. US A '''� KAREN I ENGELHARDT Notary Public - Minnesota My Commission Expires Jan 31, 2015 DRAFTED BY: City of Chanhassen 7700 Market Boulevard P. O. Box 147 Chanhassen, MN 55317 (952) 227 -1100 11