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1k. Request for extension of wetland altreation permit for T. Kordonowy i ik 1 C ITYOF - i, 1 \ f r. 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 I f (612) 937 -1900 • FAX (612) 937 -5739 Action by CftY Admhibtretdr Endorsed I DMA MEMORANDUM Mod if; c I 1 Rene tc TO: Don Ashworth, City Manager a-te m /A-9- ty g Date 5u, ed to Commisslott 1 FROM: Sharmin Al -Jaff, Planner I Date Et:' -: :f to Council / 2 - / '4- s DATE: December 8, 1992 I SUBJ: Extension of a Wetland Alteration Permit for Thomas Kordonowy, South of I Tanadoona Drive and West of Dogwood I On June 11, 1990, the City Council recommended approval of Wetland Alteration Permit (#90 -3). The wetland alteration permit was for the creation of a pond area in a Class B Wetland (Attachment #1). A Wetland Alteration Permit expires within one year after approval of the City I Council if substantial work has not been performed to implement the request. The permit expired on June 11, 1991. However, the applicant still wishes to undertake the work and has submitted the same application for review and approval by the City Council. I The proposal has not changed. Staff maintains their position by recommending approval of Wetland Alteration Permit (#90 -3) with the following conditions: I 1. The proposed ponding area conforms to the Fish and Wildlife guideline standards for ponds. I 2. The applicant provide Type III erosion control along the westerly edge of the fill area between the proposed fill area and the Class B Wetland. The fill area shall be revegetated with natural vegetation within six months of completion of the pond. 3. The applicant shall apply for a grading permit form the Engineering Department. The I permit shall be processed administratively. I 4. The applicant shall obtain and comply with all conditions of the Watershed District Permit. 1 5. The applicant shall submit an escrow of $50 for recording and attorney fees. n 1 to PRINTED ON RECYCLED PAPER 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 L. ITY OF PC /a- �• _ - C DATE: 5/16/90 CIIANUAE CC DATE: 6/11/90 1 \I'll. v CASE #: 90 -3 WAP 1 1 STAFF REPORT I PROPOSAL: Wetland Alteration Permit for the Creation of a Pond Area in a Class •B Wetland II 1" LOCATION: South of Tanadoona Drive and west of Dogwood Road I Z :Action fay Cr)/ kir41,1064vr fi APPLICANT: Thomas Kordonowy Ere r='' 'Z Get / V 3610 So. Hwy. 101 irtocii,e t- - ----- - 1 / n Wayzata, MN 55391 R"w'� .- CL 1 a : ; ",� . ,, 1 1 . I PRESENT ZONING: RR, Rural Residential ACREAGE: 0.88 acres II DENSITY: N/A ADJACENT ZONING AND 1 LAND USE: N - RR; Tanadoona Drive Q S - RR; single family E - RR; farmhouse 1 Q W - RR; single family WATER AND SEWER: Not available 1 W PHYSICAL CHARACTER.: The site generally slopes to the north and �" .west with the Class B wetland located in the imam northwest corner. 1 II 2000 LAND USE PLAN: Residential .Low Density . . 1 g O IC _plc �i5 0 v g D rn on N 0 8 ..... P4 MAN•Plt RD N F r c. fit A =law %VA op la.r... % :Fri". c ;�c = �� icr INN r �� � 1!r�si� — - �i/ 4 r, 4 .„. sm., tik.+` ., r LLL �� u Ac \` � % / R Dim i , ..,4 r � � . �l il t�� ...‘ s\ ,. , , __ ,\ 1 ‘., 1 1,\\. • ,c S y T A i , \\,_ �� = �II J J x4 ' IP _ ________ _ ■ 4 „,,„, .. m UD — . W : ,.. .7 .7 .- .4 .,. _ 74111•1 , , RR , , N 4 • • __, ` DRIVE ' 'K I , . plir,A ZI .i- 0 - ;1 o 1 +�d�(� t -i F�� -.0 �� • /�i.I a EV j E, i 1 41 i F ro . ♦i 1 Kordonowy WAP #90 -3 June 11, 1990 Page 2 APPLICABLE REGULATIONS Section 20 -421 requires a wetland alteration permit for the i creation of a pond within a Class B wetland. BACKGROUND The site has 80 acres which were subdivided administratively from a 100 acre parcel in 1989. The subject site contains one single family residence currently under construction. ANALYSIS The applicant is proposing to create a ponding area within a Class B wetland located on the westerly portion of the site. The ponding area will be approximately 8 ft. deep with a nesting island provided in the northerly portion of the pond. The ponding area is wholly within the Class B wetland limit, with an overflow device being provided on the westerly side to outlet overflow into an existing ditch which enters Lake Minnewashta. The fill area removed from the pond excavation will be located to an area above the Class B wetland directly to the east. The fill area limits are outside of the wetland area and shall be protected by Type III erosion control. The Zoning Ordinance allows dredging of a wetland with the issuance of a wetland alteration permit if it is limited as follows: 1. It shall be located as to minimize the impact on vegetation. ' The predominant vegetation of the existing wetland is reed canary grass and brom grass. The wetland has been altered from its original state by agricultural uses in the past. Currently the reed canary and brom grass is providing little habitat for wildlife. In fact, most of the vegetation lays flat on the ground from snow cover and provides little or no habitat. There will be shallow banks along the west, north and south side which will encourage emergent vegetation as recommended by the Fish and Wildlife Service. 2. It shall not adversely change water flow. The wetland does not currently have any open water. ' Currently, any surface runoff from the site goes directly through the wetland into the existing ditch where it enters Lake Minnewashta. The applicant is proposing to improve the wetland by providing a combination of a shallow and deep marsh environment. The ponding area will improve retention of storm water runoff and provide sedimentation removal which will improve the water quality of runoff entering Lake Minnewashta. 1 Kordonowy WAP #90 -3 ' June 11, 1990 Page 3 water runoff and provide sedimentation removal which will i improve the water quality of runoff entering Lake Minnewashta. The direction of water flow will not be changed. 3. The size of the dredged area shall be limited to the minimum required for the proposed action. The existing wetland is approximately 1.9 acres in size with approximately .9 acres proposed to be altered. The applicant is preserving a portion of the existing wetland along the westerly edge. Fish and Wildlife approved the size of the ponding area feeling that the resulting pond greatly increases benefits to wildlife and natural resources over the existing wetland. 4. Disposal of the dredged material is prohibited within the wetland district unless specifically authorized in the wetland alteration permit. The dredged material will be deposited outside of the wetland limits and will be separated from the wetland by Type III erosion control until it is revegetated. 5. Disposal of any dredged material shall include proper erosion 1 control and nutrient retention measures. The dredged material will be separated from the wetland by Type III erosion control and will be revegetated with natural vegetation. 6. Dredging in any wetland area is prohibited during water fowl breeding season or fish spawning season unless it is determined by the City that the wetland is not used for water fowl breeding or fish spawning. ' Dredging will not take place during water fowl breeding or fish spawning season. ' The applicant has worked closely with staff and the Fish and Wildlife Service to design the pond to Fish and Wildlife criteria. Staff has visited the site with the applicant and a representative from the Fish and Wildlife Service. The proposed design of the pond meets the Fish and Wildlife criteria as does the construction of the dike with suitable soils from the pond excavation and the installation of a pipe with metal aprons. The proposed ponding will greatly enhance the existing wetland and will provide improved wetland habitat and water retention /quality. The proposed ponding area is also meeting the general conditions for dredging in a City protected wetland. 1 I/ Kordonowy WAP #90 -3 June 11, 1990 Page 4 PLANNING COMMISSION ACTION The Planning Commission recommended approval of the wetland alteration permit with staff's recommended conditions and also added a third condition which requires the applicant to obtain a grading permit prior to starting work. This will facilitate staff's oversight of the review of work as it is performed. 'RECOMMENDATION Staff feels that the proposed ponding will be an improvement to the existing conditions of the Class B wetland and is recommending that ' the City Council adopt the following motion: "The City Council approves Wetland Alteration Permit No. 90 -3 as shown on plans dated April 16, 1990 with the following conditions: 1. The proposed ponding area conforms to the Fish and ' Wildlife guideline standards for ponds. 2. The applicant provide Type III erosion control along the westerly edge of the fill area between the proposed fill area and the Class B wetland and the fill area be revegetated with natural vegetation within six months of completion of the pond. ' 3. The applicant shall apply for a grading permit from the Engineering Department. The permit shall be processed administratively." ATTACHMENTS ' 1. Fish and Wildlife Guideline Standards for Ponds. 2. Application. 3. Wetland Alteration Evaluation Worksheet. ' 4. Wetland Data Report. 5. Letter from DNR dated April 24, 1990. 6. Section 20 -421 -3 of the Zoning Ordinance. 7. Site Plan of Pond Grading. 8. Planning Commission minutes dated May 16, 1990. 1 1 1 2. The holding ponds must meet the following six conditions established by the Fish and Wildlife Service: a. The basin will have free form (no even - sided) shape to 1 increase shoreline length and provide isolated areas for feeding and resting birds. ' b. The basin will have shallow embankments with slopes of 10:1 - 20 :1 for at least 30% of the shoreline to encourage growth of emergent vegetation as refuge and food for wildlife. c. The basin will have uneven, rolling bottom contour for variable water depth to (a) provide foraging areas for species of wildlife feeding in shallow water (0.5 - 3.0 feet) and (b) encourage growth of emergent vegetation in areas of shallow water and thereby increase interspersion of open water with emergent vegetation. d. The basin will have a layer of topsoil (muck from an existing wetland being filled) on bottom of basin to pro- vide a suitable substrate for aquatic vegetation. e. The basin will have water level control (culverts, riser 1 pipe, etc.) to minimize disturbances of wildlife using the wetland. f. The basin will have fringe of shrubs on upland surrounding the basin to minimize disturbances of wildlife using the wetland. 1 1 1 1 1 1 1 1 1 1 LAND DEVELOPMENT APPLICATION • CITY OF CHANHASSEN II 690 Coulter Drive Chanhassen, MN 55317 (612) 937 -1900 II APPLICANT: Tom Kordonowy OWNER: Same ADDRESS 3610 South Highway 101 ADDRESS 1 Wayzata, MN 55391 Zip Code Zip Code TELEPHONE (Daytime) 473 -5435 TELEPHONE REQUEST: 1 Zoning District Change Planned Unit Development Zoning Appeal Sketch Plan • Preliminary Plan Zoning Variance Final Plan Zoning Text Amendment Subdivision I Land Use Plan Amendment Platting Metes and Bounds I Conditional Use Permit Street /Easement Vacation Site Plan Review I X Wetlands Permit PROJECT NAME Pond Grading II PRESENT LAND USE PLAN DESIGNATION Class B Wetland REQUESTED LAND .USE PLAN DESIGNATION Same 1 PRESENT ZONING I REQUESTED ZONING USES PROPOSED • 1 SIZE OF PROPERTY LOCATION Tanadona Drive, Chanhassen 1 REASONS FOR THIS REQUEST For construction of a open water wetland basin. Improving the existing wetland for wildlife uses and aesthetic purposes. II 1 LEGAL DESCRIPTION (Attach legal if necessary) II City of Chanhassen, Land Development Application Page 2 FILING INSTRUCTIONS: This application must.,be completed in full and be typewritten or clearly printed and must be accompanied by all information and plans required by applicable City Ordinance provisions. Before filing this application, you should confer with the City Planner to determine the specific ordinance and procedural requirements applicable to your application. FILING CERTIFICATION: The undersigned representative of the applicant hereby certifies that he is familiar with the procedural requirements of all applicable C/i_tyy, Ordinances. • Signed By 5LF7 _ � Ai/4- OC.44, 2 4._ Date 4 //6/9 n rp 4 - eaf = _ II The undersigned hereby certifies that the applicant has been authorized to make this application for the property herein described. Signed By - Date f ic- /! • So Fee Owner Date Application Received 1 Application Fee Paid ' City Receipt No. • 1 1 * This Application will be considered.by the Planning Commission/ Board of Adjustments and Appeals at their meeting. 1 1 WETLAND ALTERATION PERMIT EVALUATION WORKSHEET To Be Completed By Applicant and Submitted with Application (Attach additional sheets if necessary) 1. WETLAND DESCRIPTION: 1 Size: 1.93 Ac. • Class: B Type II Fresh (wet) Meadow Location: Lakeside Streamside Upland X • Watershed District: Minnehaha Creek Area of Open Water: None Drainage Flows To: Lake Minnewashta Vegetation Types: Predominant population of Canary Reed Grass Soil Types: Clay 1 2. DESCRIPTION OF PROPOSED ALTERATION: Excavate for a deep water pond. (Refer to attached report for detailed explanations) • 1 1 3. PURPOSE OF PROPOSED ALTERATION: Improve the exisiting wetland as a oroaerty amenity and as a wildlife habit. 1 4 . APPLICABLE WETLAND ORDINANCE SECTION: Ti 5, )5 v?O -V36 =20 -VVO 1 5. A. DISCUSS TEE IMPACTS . ON THE PROPOSED DEVELOPMENT IF NO ALTERATION IS MADE: None, there is no development involved with t his hermit application. 1 1 5. B. IDENTIFY AND DISCUSS OTHER ALTERNATIVES 1:0 WETLAND 1 ALTERATION: None 1 C. IDENTIFY THE ADVANTAGES AND DISADVANTAGES OF THE PROPOSED 1 ALTERATION: Improve wetland as w i l d l i f e habitat and a property . Amenit 1 Y • 1 • 6. USING THE WETLAND ORDINANCE STANDARDS AS A GUIDE, DETERMINE 1 WHETHER THERE ARE ANY INCONSISTENCIES BETWEEN THE ORDINANCE • AND PROPOSED ALTERATION: No ' • 1 1 1 1 1 1 —2— 1 1 1 1 HYDROLOGIC AND WETLAND DATA REPORT 1 I. Existing Wetland Classification ' A. General The existing wetland is designated by the City of Chanhassen as a Class B Wetland. Using Eggers and Reed, "Wetland Plants and Plant Communities of Minnesota and Wisconsin descriptions of wetland types, this wetland community closely fits into a fresh (wet) meadow and low prairie classification. A closer examination of these classifications seems to indicate that prior to 11 agriculature in the area, this wetland may have been a low prairie wetland community dominated by low growing native grasses and forbes associated with the prairie such as by bluestem, prairie dock, New England aster, ' culvert root, cord - grass, etc. Agricultural land use has since disturbed the natural wetland environment by changing the natural drainage patterns, introducing nutrients and sediments into the wetland, harvesting the wetland for hay, pasturing, and possibly cultivation during dry periods. The overall effect of this disturbance has resulted in a wetland and plant community different from a low prairie. ' At one time the wetland may have had a natural combination of red -top grass and reed canary grass and an abundance of forbes such as giant golden rod, marsh 11 aster, swamp aster, red stem aster, etc. However, agricultural disturbance most benefits reed canary grass which is now the most dormant vegetation in the wetland. Based on this analysis, the present classification that best fits the wetland is an agricultural disturbed frest (wet) meadow with an aggressive and dominant population of reed canary grass. A comparison to Circular 39, U.S. Fish and Wildlife Service indicates a wetland classification Type 1 seasonally flooded basin or flat wet meadow. II. Existing Wetland Data A. Soil Types: (Refer to hand auger borings) 1. Black silty clay (topsoil) 2. Black gray clay (underlying) B. Aquatic characteristics: None - the wetland does not have an open water surface or a permanent water profile. Surface runoff or a high -1- t water table during wet periods may temporarily cause a water depth of 1" to 12" depth - this water will continually drain from the wetland. C. Vegetation: 11 Predominant population of reed canary grass. D. Habitat: Some food and cover for small upland animal and bird species. III. Existing Hydrologic Data 1 A. General: The wetland vegetation is supported by an exposed high , ground water table and by surface runoff. The primary source of water is from ground water. Surface runoff naturally outlets via a ditch located on the southwest corner of the wetland. The existing wetland does not "hold" or "detain" surface runoff B. Present active ground water elevation: 950.8. 1 C. Potential high water elevation: 952.8 to 953.5. D. Ponding and Drainage: The surface runoff to the wetland flows- through the basin with minimal ondin or detention. P g IV. Proposed Wetland Alterations A. Objective The purpose of this wetland alteration project is to change the existing wetland dominated by a 100% cover of reed canary grass into a combination shallow and deep marsh environment. The dredging will create a deep marsh community surrounding a 2400 square foot nesting island. Along the west, north and south banks, shallow banks graded at a slope of a maximum of 10:1 will provide areas to encourage growth of emergent vegetation (shallow marsh) for refuge and food for wildlife, especially waterfowl. Overall, the project will enhance the existing wetland as a wildlife and waterfowl habitat and provide an aestetic amenity to this property and adjacent property owners. B. Refer to plan for pond grading, erosion control, outlet , structure and restoration requirements. -2- C. Filling: Will be done beyond the existing wetlands and restored with native grasses and wild flowers. ' D. General wetland data 1. Existing wetland on property (estimated) = 1.93 acres. 2. Proposed alteration area = 0.88 acres. I/ 3. Undisturbed wetland = 1.05 acre. 4. Proposed area for filling = 1.1 acre. V. Proposed Hydrologic Data A. Existing Watershed and wetland basin parameters 1. Area: 25.80. I 2. Land use: open space, woods, meadow, one major structure CN = 62. 3. Outlet to Lake Minnewashta, minimal detention or retention of runoff in wetland basin. 4. Drinage to wetland is overland flow, no storm sewer in watershed. 5. Water quality: The existing basin provides for primarily sedimentation removal. Since the runoff flows through basin, there is minimal nutrient removal. 6. 'Q discharge during 100 -year storm, 5.9" in 24 hours, SCS hydrograph methods = 50 cfs. ' B. Proposed watershed and wetland basin parameters: (there is no change in the hydrologic parameters in the watershed from existing to proposed except as noted). 1. Outlet: A 12" CMP will establish an outlet at elev. 953.5; normal water elevation in the pond will range from 953 to 953.5. 2. Water quality - The dike and 12" CMP outlet will provide detention storage for removal of waterborne 11 sediments. Removal of nutrients will be enhanced by the retention characteristics of a deep open water pond containing a large volume of water. 3. Q discharge from a 100 -year storm assuming a normal water elevation of 953.5 = 5 cfs. 1 11 -3- 1 4. Water budget - The watershed will contribute an estimated 7.46 acre feet of water, approximately 2.7 acre feet will evaporate leaving an annual change of pond volume of 4.6 acre feet. Ground water elevations of 949 to 952 are estimated to be the base level while the 4.6 acre feet will bring the normal level up to the 953+ elevation. To help maintain a normal elevation of 953 an irrigation pump will be installed. The well will pump into the pond. Irrigation water will then be pumped from the pond for watering purposes. 1 1 1 1 1 1 1 1 1 1 1 1 1 -4- 67Y /5 T /.0 /Q CS E � P 1 24 HOUR STORM 5 5 R ed/1 p 7E7e Q/r ra 4 TYPE II DISTRIBUTION 1/©1' 4 — KORDONOWY 100YR 24HR I INIT Tc = 12.00 min INPUT VARIABLES: AREA = 25.80 acres 11 PRECIP = 5.90 in CN 62.00 TOTAL Tc = 12.00 min II UNIT HYDROGRAPH: D = 3.33 min II Tp = 8.87 min Tr = 14.78 min Op = 132.05 cfs II RUNOFF: THIS AREA = 189402.74 cf TOTAL = 189402.74 cf MAX RATE = 49.85 cfs l'HYDROGRAPH STORED IN FILE KOR100 II II II II II II II II 11 �p oS6 / ,4 .) * * ** STORM WATER HYDROLOGY * * ** 7Q 2/9 ) S / � Retention /Detention Basin Design INFLOW FROM FILE KOR100 / mo d y '- - a / INFLOW VOLUME = 189402.74 cf IRREGULARLY SHAPED POND 1 STAGE STORAGE ft cu ft .5 20250 1 1.5 70250 2.5 133750 3.5 190000 1 RETENTION H = 3.49 ft OUTLETS: 1 SUBMERGED ORIFICE HEIGHT = 0.01 ft DIAM = 12.00 in 1 MAX DISCHARGE = 5.11 cfs 1 BASIN VOL. = 85050.37 cf BASIN DEPTH = 1.73 ft 1 1 1 1 1 1 1 I . . . ii , 17 -1-- -, BC. �OELL & MADSON, .NC. Job No. Date 4� l 9d ENGINEERS • SURVEYORS • PLANNERS Sheet of SOIL TESTING 1 Project ,62.-Z> oivot.0 RNA /f ey V" Subject 1-7///P LO 4 L/ Ck'd 1 1 f1,v 4 Ci e A-c, E • 1 /A 4Q tr A , POCV,-,�� 1 __ (So .F (Gu.Ar) (Ca, Fr) 1 953:5" 37,000 0 0 . 0 20. 25" 0 ?5 4000 .4,S ZD,ZS'D 955 54 ODD /, S 7b 257) 1 (p 5P c is - (o 741900 (9. S I3',7 sr) 1 1 1 1 1 1 1 1 1 1 1 rr urris u) neet Z: ttunoii curve nuner and runoff 1 Project 1 ! a e c Ld-,1 0.44 -6 (, gal 01 By 1 Date // 3 /9O ( Location (`Ja,1 /7_46./4 Checked Date Circle one: Developed /4/0 h ("/ides ' 1. Runoff curve number (CN) 1 l • Soild of • name Cover description 1/ Area Product 1 CN - hydrologic (cover type, treatment, and ev - CN x area group hydrologic condition; e v 1 v i acres percent impervious; m N N m 12 ' unconnected /connected impervious p CI 0 O X (appendix A) ( area ratio) H w w E 1 ) nor= u1 ,t2�.e. 64 �S i' /S& Pe -e x - , _ !2.7,: _ P 1 9 0. /9' ► 1 (1 • I/ i 2 Use only one CN source per line. Totals • a�I_ /•5 /Tge , CN (weighted) ■ total product i /C( m to /, s Use CN ■ I Z I 1 total area a S. 2. Runoff 1 Storm 11 Storm 12 Storm /3 Frequency yr / / 0 1 /0 0 Rainfall, P (24 -hour) to . p. 3 1, Z 5' 7 Runoff, Q in O' /1/ AC. 7/ /i 9T II (Use P and CN with table 2 -1, fig. 2 -1, - or eqs. 2 -3 and 2 -4.) II D-2 (210- V1- TR-55, Second Ed., June 1986) 1 1 STATE OF (, 0 040. 1 EN IN] DEPARTMENT OF NATURAL RESOURCES is\v METRO REGION WATERS - 1200 WARNER ROAD, ST. PAUL, MN 55106 PHONE NO. 296 -7523 FILE NO. April 24, 1990 Ms. JoAnn Olsen City of Chanhassen 690 Coulter Drive Box 147 Chanhassen, MN 55317 1 Dear Ms. Olsen: RE: THOMAS KORDONOWY, LAKE SUSAN HILLS DEVELOPMENT, CITY OF ' CHANHASSEN, CARVER COUNTY Lake Susan Hills The DNR - Division of Waters has no comments to make on the Lake Susan Hills P.U.D. plan amendment. It does not appear to be within a shoreland district or a floodplain and no protected waters occur within the limits of the development. Wildlife Dugout - Thomas Kordonowy The proposed wetland alteration is not within a DNR protected wetland and will not require a DNR protected waters permit. The DNR Area Wildlife Manager (Jon Parker @ 445 -9393) should be consulted in the design ,of the wildlife dugout to ensure that the proposed changes will be beneficial to wildlife. Thank you for the opportunity to comment. Please contact me or Hydrologist Joe Richter at 296 -7523 should you have any questions concerning these comments. Sincerely, Ceil Strauss Area Hydrologist C214:kap cc: Jon Parker, AWM zE�EC ►:,� APR 27 1990 AN EQUAL OPPORTUNITY EMPLOYER WTY CHANHASSEN 11 t 1 ZONING 4 20-422 ( 1 DIVISION 2. WETLAND ALTERATION PERMIT Part A General Provisions 1 t Sec. 20 -421. Required. The following activities are prohibited in the wetland area indicated unless the city 1 council issues a wetland alteration permit allowing the activity: (1) Scientific research projects'in a class A or class B wetland which alter the wetland. I (2) Public works in a class A or class B wetland except for emergency public works which shall not require a wetland alteration permit.. j (3) Creation of ponds or dams and alterations of the natural drainageways or water courses of a class A or class B wetland ( 1 4) Removal from class A wetland of trees or vegetation except hay, crops and diseased and storm damaged trees and vegetation which shall not require a wetland alteration I permit. (5) Docks, walkways and boardwalks, within class A or B wetland. (6) Installing or replacing drain tile or ditches in a class A wetland. Repairing existing 1 drain tile, in a class A wetland if the property has not been in active agricultural use during the twelve (12) months preceding February 19,1987. • (7) Development in any class A wetland or within two hundred (200) feet of a lass A wetland that is within the wetland's watershed. (8) Septic or soil absorption systems in a class B wetland. 1 (9) Sedimentation basins in a class B wetland. (10) Any s&ucture in a class A or B wetland except for minor expansion and additions to I single- family detached dwellings existing February 19, 1987 that do not require a wetland alteration permit. (11) Digging, dredging, filling in a class A or B wetland. (12) Advertising signs in a class A or B wetland. • (Ord. No. 80, Art. V, 1 24(5 - 247),12.1586) . 1 Sec. 20.422. Application, issuance, etc. The applicant for a wetland alteration permit shall furnish the information required by I the city including but not limited to, a site plan, topographic data and hydrological data for ' the review of a wetland alteration permit application. A wetland alteration permit shall not be issued without having been first reviewed by the vuig y Planning commission and approved by the council following the review procedures set forth for conditional use permits. 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" ,-- \ ; i iLr!„, ri --:- - ..-. , i� ' r ; • \' •; .....-..---- --- r ` 1 i � ( c_ ---- AP 1 ./Ci k , * ,_. _........ .....1 .. _ \ : ,..., „ :,ki, ...„ e - - — - ••' ' ‘. • el.' i.../ ' le.....„; i . . . - - - . > " . . . . - , • • • . . . . . ' ' . . . • . ' -- .-.- - . • \ • -- • '''' ' ' ile---15 - "NY .' . I - - , -..7- - -,a ' 1 r JC " if " . �` :� , 0 +;' • 1 • \ s :. • 1 CHANHASSEN PLANNING COMMISSION II REGULAR MEETING MAY 16, 1990 • Chairman Conrad called the meeting to order at 7:40 p.m.. MEMBERS PRESENT: Steve Ethmings, Annette Ellson, Ladd Conrad, Brian Batzli, Jim Wildermuth and Joan Ahrens MEMBERS ABSENT: Tim Erhart STAFF PRESENT: Paul Krauss, Planning Director; Jo Ann Olsen, Senior Planner; and Sharmin Al -Jaff, Planner One. PUBLIC HEARING: CONSIDER APPLICATION OF THOMAS KORDONOWY FOR A WETLAND ALTERATION PERMIT TO CREATE A POND IN A CLASS B WETLAND ON PROPERTY ZONED RR, RURAL RESIDENTIAL AND LOCATED SOUTH OF TANADOONA DRIVE, WEST OF DOGWOOD'ROAD. II Public Present: 11 Name Address Tom Kordonowy Applicant Martin Jones Dogwood Road 1 Sharmin Al -Jaff presented the staff report on this item. r Conrad: Just a quick question before we open it up to the public. Why is the water quality going to improve based on the dredging? What is it that's causing the quality to improve that will flow into Lake Minnewashta? Al -Jaff: It is in the report. The bottom of the pond will not be level and... Conrad: Act as a sedimentation basin? Krauss: Well you're getting both sedimentation plus for wetland vegetation helps to filter as well. We're working...especially since apart from the house Mr. Kordonowy will be developing. Conrad: Okay. We'll open it up for public comments. If the applicant is here. If he has anything to say. Tom Kordonowy: Good evening Mr. Chairman, members of the Planning Commission. My name is Tom Kordonowy and requesting this ponding area really for our enjoyment but beyond that we think that it's an enhancement 11 to the area. Creation of the open water should probably have nesting for friendly critters and we think would be kind of a nice addition to the area so that's my only comment. Read the staff report and in concurrence with it. We've tried to work closely with staff in designing the pond to conform to the requirements of the ordinance as well as I say, improve the area. I'd be happy to answer any questions you may have. Conrad: We may have some later. Thanks Tom. Any other public comments? 11 Planning Commission Meeting May 16, 1990 - Page 2 Martin Jones: I'm Martin Jones. Mr. Kordonowy will become a neighbor of mine. Everything that he has done so far has been excellent. I can't say no to anything he has done so far. At this point I'll say go ahead with this. It looks great. Conrad: Thank you. Anything else? Any other comments? Is there a motiorl to close the public hearing? • Batzli moved, Wildermuth seconded to close the public hearing. All voted II in favor and the motion carried. The public hearing was closed. Conrad: Steve, comments? 1 Emmings: No. It looks like this was designed very carefully with all the considerations that I can see taken into account and I support the staff's" recommendations. Ellson: I think it looks great. I'm glad to see someone being proactive in the right direction for a change but I do have a question in regards to once this is in place. Then it would be guarded and let's say he sold the land or whatever, as a pond now. The wetland contains the pond and then the pond can no longer be altered and everything like that? Would that bell true? You know what I'm saying? Once you dig it as a pond and turned it into one and then maybe if it passes hands or whatever and someone doesn't want a pond there anymore, because he altered the wetland and it was permitted, now nobody else could take away the pond because that would now" be altering it again. Krauss: Well it is classified as a wetland and I've got to believe this would take on Class A wetland characteristics which would make it even tougher to alter. We also require plans...at Hennepin County. In fact we're getting our ordinance to...so future property owners would be on notice that this is a condition of approval. Ellson: Yeah, I assume that they'd have to come in for a wetland , alteration permit but I'm saying would we allow them to go back? Once you've got it improved you'd hope that you now have to stay at the level of improvement and you can never have to go back and things like that. I guess we don't ever have a total guarantee it doesn't sound like but I the fact fact that it's being improved and I'd just like to say okay, now that it's improved, no holds bar. - We can't go back anymore on it no matter who takes it over after that. 1 Martin Jones: Can I make one comment? You said it's been improved. Yes, it will be. If it would go back to the original, that ain't all bad so I don't think you're going to have a loss either way. If Mr. Kordonowy decides to sell, it would go back to the original, it would not be bad. It's better this way but it won't be bad the other way. Ellson: Those are just the only things I thought about. Batzli: It looks like the applicant has worked well with staff and it looks like a good plan. 1 11 Planning Commission Meeting May 16, 1990 - Page 3 1 11 Wildermuth: I like the plan. I just have one question. How does the water currently flow under Tanadoona Drive? Is there a culvert? Martin Jones: I can answer that. There's a 12 inch culvert underneath the road that's just at the curve where Tanadoona turns into Dogwood. There's a 12 inch culvert going there and that's been in place for the last I'd say 6 or 7 years since the new culvert. Wildermuth: Do we think the pond would alter that in any way Paul? Krauss: No. The pond's not going to release water any faster than it... Wildermuth: Because of where the installation of the, where is it? A pipe with metal aprons at the exit of the pond. Okay. That's all I've have. Ahrens: I think it's a good plan too but there a number of conditions that are very specific and I just had a question. Does the City find it 1 difficult to monitor all the conditions that are set up with the approval of this permit? I mean they can't dredge during certain times and they have to locate the dredging material in a certain place and how do you know that's going on? Krauss: Frankly it's difficult because unlike a home or a building, you don't have a building permit that trips the process. What we do is we depend on the applicant to notify us that work's been started and we go out and monitor that from time to time. We...staff to do that. We do make the attempt to follow up as best we can. In the future I'd like, and by the way the grading ordinance passed at the City Council Monday night and I think that we can use that to require, in fact you may want to add a condition that they obtain a grading permit prior to starting the work from the engineer's department so we have a definitive permit so we know when they are grading. Conrad: I have no comments. It looks like a good application. I like it when we improve a wetland and the residents get what they want. I think that's just a good win -win situation. Is there a motion? Ellson: I'll move the Planning Commission recommend approval of Wetland Alteration Permit #90 -3 as shown on plans dated April 16, 1990 with the following two conditions and one condition also added. And the third condition should read that the applicant is to obtain a grading permit prior to start. Wildermuth: Second. Ellson moved, Wildermuth seconded that the Planning Commission recommend approval of Wetland Alteration Permit #90 -3 as shown on plans dated April 16, 1990 with the following conditions: 1 1. The proposed ponding area conforms to the Fish and Wildlife guideline standards for ponds. - 1 1 • 1 Planning Commission Meeting May 16, 1990 - Page 4 i 2. The applicant provide Type III erosion control along the westerly edge of the fill area between the proposed fill area and the Class B wetlan and the fill area be revegetated with natural vegetation within six months of completion of the pond. ' 3. The applicant shall obtain a grading permit prior to beginning work on the wetland. All voted in favor and the motion carried. PUBLIC HEARING: r PRELIMINARY PLAT OF 3.2 ACRES INTO 2 SINGLE FAMILY LOTS ON PROPERTY ZONED RSF AND LOCATED AT 365 PLEASANT VIEW ROAD, ROBERT SATHRE. Sharmin Al -Jaff presented the staff report. Chairman Conrad called the public hearing to order. Conrad: Maybe we'll open it up with the applicant. Bob, any comments on II the staff report? Bob Sathre: Not really. There's nothing different other than the exchangll that was not considered with the vacating of Baldur Avenue. Conrad: That cleans it up pretty easily. Any other comments? 1 Batzli moved, Ellson seconded to close the public hearing. All voted in favor and the motion carried. The public hearing was closed. 1 Ahrens: I guess it makes sense to have the property located west of the driveway. Become part of Lot 3, that's right. Is that the proposal? Rather than have it divide Lot 1. I guess it makes more sense for the proposed drive on Lot 1 also. I had a uestion why that wasn't connected 4 Y onto the other private drive. Since there was some concern that the proposed drive on Lot 1 not be located too close to Horseshoe Curve but it's almost right on top of the other private drive. Is that how, I mean II that's the way it looks to me. Krauss: They're still separated by, I don't remember the exact distance 1 but we can scale that off, but there's a grade change there. I think if you're going with the first report we said that we would prefer to have a single curb cut and we would have recommended it if we thought it was realistic to do but because of the grade change we didn't think it was so I I we just added a condition that the driveway to the new home has to be as far east as possible. 1 Ahrens: As far east from what? From the other existing driveway? Al -Jaff: The engineering department said that if there is a distance of 1 100 feet, that allows enough visibility and there is a distance of 100 feet. Ahrens: Between the two driveways? 1 V ' este . CHANHASSEN CITY COUNCIL ' 1 t.i i.- II REGULAR MEETING JUNE 11, 1990 Mayor Chmiel called the meeting to order at 7:30 p.m.. The meeting was opened • with the Pledge to the Flag. COUNCILMEMBERS PRESENT: Mayor Chmiel, Councilman Boyt, Councilman Workman and II Councilman Johnson COUNCILNEMBERS ABSENT: Councilwoman Dimler II STAFF PRESENT: Don Ashworth, Gary Warren, Paul Krauss, Roger Knutson, Jim Chaffee and Sharmin Al -Jaff II APPROVAL OF AGENDA: Councilman Johnson moved, Councilman Workman seconded to approve the agenda amended to add the following under Council Presentations: Councilman Workman wanted to discuss transportation related items and Don II Ashworth wanted t: discuss a building on TH 5 for the Fire Department. All voted in favor of the agenda as amended and the motion carried. Councilman Johnson: As long as everybody's here, what day was that for Perpich coming in? Councilman Workman: Southwest Corridor Transportation Coalition goes, who are 11 I promoting TH 5 and 212 have invited the Governor and Transportation Commissioner Levine out to this -area to say thanks for helping us with the highways thus far. We need more help obviously but for are to kind of rub elbows I guess with those II people. It's going to be at MTS at 5:00 to 7:00. It's going to be a buffet dinner. I think the cost is $7.00 or something. 5:00 to 7:00. It sounds like Lola will be there but an opportunity to talk a little bit about highways and :- transportation and those interested should RSVP to the Eden Prairie Chamber " soon. PUBLIC ANNOUNCEMENTS: None. II CONSENT AGENDA: Councilman Johnson moved, Councilman Workman seconded to approve the following consent agenda.items pursuant to the City Manager's II recommendations: .0 y- a. Wetland Alteration Permit Request to Alter a Class B Wetland, South of Tanadoona Drive and West of Dogwood Road, Thomas Kordonowy. II b. Preliminary Plat Approval to Subdivide 3.2 Acres into 2 Single Family Lots, 365 Pleasant View Road, Robert Sathre. II c. Extension of Final Plat Approval, Burdick Second Addition. g. Resolution 190 -62: Approve Plans and Specifications for Sanitary Sewer Extension to Harvey /O'Brien Property; Authorize Advertising for Bids. j. Approval of Temporary Beer License for 4th of July Celebration, Chanhassen II Rotary. 1 1 1 ji City Council Meeting -JP-, 11, 1990 1. Approval of Accounts. m. City Council Minutes dated May 14, 1990 City Council Minutes dated May 30, 1990 Park and Recreation Commission Minutes dated May 21, 1990 a. Accept Donation from the Chaska Lions to the Park and Recreation Department. i All voted in favor and the lotion carried. K. APPROVE BUDGET AMENDMENT FOR COMPLETION OF THE COMPREHENSIVE PLAN. 1 Paul Krauss: As you're aware we've been working quite intensively on completing the Comprehensive Plan for the City. It's been a process that's taken approximately 18 months to get to this point. I guess I should start out with the fact that the memo that you received in your packet is a little outdated and unfortunately you didn't get a copy of the newer memo that should supercede that and I'll explain why in a minute. It's been clear to us for some time now that there weren't enough funding allocated to complete the Comprehensive Planning effort. There's a number of reasons for that. I've listed them in the report and I think they're still accurate. The scope of the plan is expanded considerably. Not only since we started the effort about 18 months ago but since I came here in the fall it's been quite clear that the magnitude of what the Planning Commission was considering was quite great. I arrived late in the budgetary process and was really unable to interact very much in terms of the allocations. We've expanded our work efforts with traffic, transportation and have contracted with our consultant working on the Eastern Carver County study to make some special runs for Chanhassen so we knew what the development would 1 1 yeild. The Metropolitan Council in the last month or so has come out with some very strict guidelines as to what they'll be looking for in the plan and I've had ongoing discussions with them and it continues to get more involved frankly. The last item is that the official public hearing process, I think as you're aware, has just begun and there is a level of work that's tough to anticipate that comes out of those meetings because we basically have to back up. Look at alternatives. Come up with position papers. Give the Planning Commission information they need to proceed. The initial memo indicated that there was a request for an additional $10,000.00 allocation to complete the plan. Unfortunatley that memo was drafted sometime in February and was printed in March and was never dispersed. Don and I had talked about it periodically and decided not to submit it at that time. Since that time the work effort has expanded quite a bit and there was a new memo that had been drafted for this packet that indicated that felt that we needed approximately $25,000.00 to 1/ finish the work effort. So I think the reasons are all still the same reasons but we've had the new work effort in the transportation area. The Metro Council is more recent and the neighborhood interaction is more recent as well. Ye apologize for having sent out the wrong memo but the correct amount that we believed that we needed to finish the plan was $25,000.00. With that I'd be happy to answer any questions I can. 1 Mayor Chmiel: Any questions? 2 1' 1 1 4 4fFD OAS y ± c�fFt )..., ■ ■ t IV i1 . i_ L:.. _ LAKE NINNETONKA 1 I AT .& . iii > G r P.O. Box 387, Wayzata, Minnesota 55391 I BOARD OF MANAGERS: James R Spensley, Pres. • Albert L. Lehman • John E. Thomas .. ,----•-" Richard R. Miller • Robert D Erickson • C. Woodrow Love • Clarkson Lindley - i Permit Application No. 90 -83 June 26, 1990 ' Applicant: Tom Kordonowy I 3610 S. Highway 101 Wayzata, MN 55391 Location: City of Chanhassen, Sec. 8AD Purpose: Stormwater Management Plan for excavation of a pond in a Type I wetland I east of Lake Minnewashta. Dear Mr. Kordonowy: 1 At the regularly scheduled June 21, 1990 meeting of the Board of Managers, the subject permit application was reviewed. Action was taken allowing the District staff to issue your permit only J after receipt and staff approval of the following: 1. Revised grading plan with pond slopes no steeper than 4:1 and providing 1 -foot of freeboard above the projected 100 -year frequency flood elevation. I 2. Cross section of the existing runout ditch including runout elevation and specifying the slope of the ditch. I Please be advised that the project is not authorized until the above has been submitted to me and you have been notified of permit issuance from the Minnehaha Creek Watershed District. Should you have any questions regarding this matter, please contact me at 473 -4224. 1 Sincerely, JAMES M. MONTGOMERY, I CONSULTING ENGINEERS, INC. Engineers for the District • Ronald S. Quanbeck, P.E. I bt cc: Bo ile I try of Chanhassen Schoell & Madson 1 , \ Vrl ' 1 1...0 JUN 2 8 1993 C ITY OF CHANHASSEN 1 1 HYDROLOGIC AND WETLAND DATA REPORT 1 I. Existing Wetland Classification 1 A. General The existing wetland is designated by the City of Chanhassen as a Class B Wetland. Using Eggers and Reed, "Wetland Plants and Plant Communities of Minnesota and Wisconsin descriptions of wetland types, this wetland community closely fits into a fresh (wet) meadow and low prairie classification. A closer examination of these classifications seems to indicate that prior to agriculature in the area, this wetland may have been a low prairie wetland community dominated by low growing native grasses and forbes associated with the prairie 11 such as by bluestem, prairie dock, New England aster, culvert root, cord - grass, etc. Agricultural land use has since disturbed the natural wetland environment by changing the natural drainage patterns, introducing nutrients and sediments into the wetland, harvesting the wetland for hay, pasturing, and possibly cultivation during dry periods. The overall I/ effect of this disturbance has resulted in a wetland and plant community different from a low prairie. At one time the wetland may have had a natural combination of red -top grass and reed canary grass and an abundance of forbes such as giant golden rod, marsh 11 aster, swamp aster, red stem aster, etc. However, agricultural disturbance most benefits reed canary grass which is now the most dormant vegetation in the wetland. Based on this analysis, the present classification that best fits the wetland is an agricultural disturbed frest (wet) meadow with an aggressive and dominant population of reed canary grass. 1 A comparison to Circular 39, U.S. Fish and Wildlife Service indicates a wetland classification Type 1 seasonally flooded basin or flat wet meadow. II. Existing Wetland Data A. Soil Types: (Refer to hand auger borings) 1. Black silty clay (topsoil) 2. Black gray clay (underlying) B. Aquatic characteristics: 1 None - the wetland does not have an open water surface or a permanent water profile. Surface runoff or a high - 1 1 . water table during wet periods may temporarily cause a water depth of 1" to 12" depth - this water will continually drain from the wetland. C. Vegetation: Predominant population of reed canary grass. D. Habitat: Some food and cover for small upland animal and bird species. III. Existing Hydrologic Data A. General: The wetland vegetation is supported by an exposed high ground water table and by surface runoff. The primary source of water is from ground water. Surface runoff naturally outlets via a ditch located on the southwest corner of the wetland. The existing wetland does not "hold" or "detain" surface runoff B. Present active ground water elevation: 950.8. C. Potential high water elevation: 952.8 to 953.5. D. Ponding and Drainage: The surface runoff to the wetland flows- through the basin with minimal ponding or detention. 11 IV. Proposed Wetland Alterations A. Objective The purpose of this wetland alteration project is to change the existing wetland dominated by a 100% cover of reed canary grass into a combination shallow and deep marsh environment. The dredging will create a deep marsh community surrounding a 2400 square foot nesting island. Along the west, north and south banks, shallow banks graded at a slope of a maximum of 10:1 will provide areas to encourage growth of emergent vegetation (shallow marsh) for refuge and food for wildlife, especially waterfowl. Overall, the project will enhance the existing wetland as a wildlife and waterfowl habitat and provide an aestetic amenity to this property and adjacent property owners. B. Refer to plan for pond grading, erosion control, outlet structure and restoration requirements. 1 1 -2- C. Filling: Will be done beyond the existing wetlands and 1 restored with native grasses and wild flowers. D. General wetland data 1 1. Existing wetland on property (estimated) = 1.93 acres. 1 2. Proposed alteration area = 0.88 acres. 3. Undisturbed wetland = 1.05 acre. 1 4. Proposed area for filling = 1.1 acre. V. Proposed Hydrologic Data 1 A. Existing Watershed and wetland basin parameters 1 1. Area: 25.80. 2. Land use: open space, woods, meadow, one major 1 structure CN = 62. 3. Outlet to Lake Minnewashta, minimal detention or retention of runoff in wetland basin. 4. Drinage to wetland is overland flow, no storm sewer in watershed. 5. Water quality: The existing basin provides for primarily sedimentation removal. Since the runoff flows through basin, there is minimal nutrient removal. 6. Q discharge during 100 -year storm, 5.9" in 24 1 hours, SCS hydrograph methods = 50 cfs. B. Proposed watershed and wetland basin parameters: (there I/ is no change in the hydrologic parameters in the watershed from existing to proposed except as noted). 1. Outlet: A 12" CMP will establish an outlet at 11 elev. 953.5; normal water elevation in the pond will range from 953 to 953.5. 1 2. Water quality - The dike and 12" CMP outlet will provide detention storage for removal of waterborne sediments. Removal of nutrients will be enhanced by the retention characteristics of a deep open water pond containing a large volume of water. 3. Q discharge from a 100 -year storm assuming a normal 1 water elevation of 953.5 = 5 cfs. 1 -3- 4. Water budget - The watershed will contribute an estimated 7.46 acre feet of water, approximately 2.7 acre feet will evaporate leaving an annual change of pond volume of 4.6 acre feet. Ground water elevations of 949 to 952 are estimated to be the base level while the 4.6 acre feet will bring the normal level up to the 953+ elevation. To help maintain a normal elevation of 953 an irrigation pump will be installed. The well will pump into the pond. Irrigation water will then be pumped from the pond for watering purposes. 11 1 1 1 1 1 1 1 1 1 11 1 -4- 11 • • ��/ S T /,U D ?0 S 24 HOUR STORM C� S /e(,/ /lO 7 f7 d`' re 1 TYPE II DISTRIBUTION /or) y2 4 *,e) */4- c **/7* ** * *d*******P**** - fin — KORDONOWY 100YR 24HR INIT Tc = 12.00 min INPUT VARIABLES: AREA = 25.80 acres PRECIP = 5.90 in CN = 62.00 TOTAL Tc = 12.00 min 1 UNIT HYDROGRAPH: D = 3.33 min Tp = 8.87 min Tr = 14.78 min Op = 132.05 cfs 1 RUNOFF: THIS AREA = 189402.74 cf TOTAL = 189402.74 cf MAX RATE = 49.85 cfs HYDROGRAPH STORED IN FILE KOR100 11 11 r 1 1 1 r 1 r 1 • / 2O� as'6 ihil/xJ it * STORM WATER HYDROLOGY * * ** 5 7 '/ 9 C 1 2 1 , C etenti on!Detenti on Basin Design /`J � i ‘_ `;/ / ..:y NFLOW FROM FILE KOR100 NFLOW VOLUME = 189402.74 cc RREGULARLY SHAPED POND STAGE STORAGE . l cu ft i 20250 11 1.5 70250 2.5 1:: 3750 11 3.5 190000 RETENTION H = 3.49 ft 1[UTLETS: I UBMERGED ORIFICE EIGHT = 0.01 ft DIAM = 12.00 in 1 Ilt Ax DISCHARGE = 5.11 cfs ASIN VOL. = 85050.37 cf BASIN DEPTH = 1.73 ft II 11 II I II 11 II 11 1 • • ---'- SCHOELL & MADSON, INC. Job No. • Date /I" /-9-) ENGINEERS • SURVEYORS • PLANNERS Sheet of // SOIL TESTING Project .L o,P> o.vvct,9 t By d Subject �./ C 74// /, /‘'Xv LID e_A- ; 1 Z A) rz, 6i /2- 4a. e A Voe.I.,,,y7 lioutr,ie 1 (so . F r) (Gu.Pr) (Cv,Fr) 953.5 3v 000 a o 0 z 1 o,Zso 95V 4¢0o0 •D.5-' zo,z.S 50 po 955 54 DOD /, S 7D� Z SD fa - ai SD° I 9s 71,(900 a . 5- 1 I 1 1 1 1 1 1 1 1 I 1 rr urrisn . Z: ttunult curve numUer and rt. AI / � d h � Project / )6 e rL 6 r 1 ec-4. -• P • By ` �,/ Date I " //3 30 1 Location (7,'(-(i ? l e e,, /i^ Checked Date ../.. Circle one: (Prese& Developed 47) h�.;.,) , , ,s,v;„/ 1. Runoff curve number (CN) II Soil name Cover description Area Product and CN-- 1/ of I hydrologic (cover type, treatment, and cv 11 CN x area group hydrologic condition; (� i v i ( acres percent impervious; w �' �' D mil unconnected /connected impervious p co oa OZ II (appendix A) area ratio) H w w P: f -- - , � s_. np 1 ( 1 1 1/ Use only one CN source per line. Totals c' '}' / ' g II CN w total product /Sii� 1 i < :2- ( eighted) ''--- t= Use CN 1 total area a 11 2. Runoff , Storm 11 Storm f2 Storm f3 II Frequency y / /0 i00 II Rainfall, P (24 -hour) to c2• 3 Z -5' Runoff, Q in 0, /I/ 6, °/ /e. or:'" (Use P and CN with table 2 -1, fig. 2 -1, (, II or eqs. 2 -3 and 2 -4.) I .2 (210- V1- TR -55, Second Ed., June 1986 II � 22 STATE OF (A4040:: H UPI LS S CD7C- u�r DEPARTMENT OF NATURAL RESOURCES ��� METRO REGION WATERS - 1200 WARNER ROAD, ST. PAUL, MN 55106 PHONE NO. 296 -7523 FILE NO. April 24, 1990 1 Ms. JoAnn Olsen City of Chanhassen 690 Coulter Drive Box 147 Chanhassen, MN 55317 Dear Ms. Olsen: 1 RE: THOMAS KORDONOWY, LAKE SUSAN HILLS DEVELOPMENT, CITY OF CHANHASSEN, CARVER COUNTY 1 Lake Susan Hills The DNR - Division of Waters has no comments to make on the Lake 1 Susan Hills P.U.D. plan amendment. It does not appear to be within a shoreland district or a floodplain and no protected waters occur within the limits of the development. Wildlife Dugout - Thomas Kordonowy The proposed wetland alteration is not within a DNR protected 1 wetland and will not require a ONR protected waters permit. The DNR Area Wildlife Manager (Jon Parker @ 445 -9393) should be consulted in the design of the wildlife dugout to ensure that the proposed changes will be beneficial to wildlife. Thank you for the opportunity to comment. Please contact me or Hydrologist Joe Richter at 296 -7523 should you have any questions concerning these comments. Sincerely, 1 C2 j Ceil Strauss Area Hydrologist C214:kap cc: Jon Parker, AWM 1 ;�Gci Y L.LJ APR271990 1 WTY OF CHANHASSEN AN EQUAL OPPORTUNITY EMPLOYER 1 2. The holding ponds must meet the following six conditions established by the Fish and Wildlife Service: a. The basin will have free form (no even - sided) shape to increase shoreline length and provide isolated areas for feeding and resting birds. b. The basin will have shallow embankments with slopes of 10:1 - 20:1 for at least 30% of the shoreline to encourage growth of emergent vegetation as refuge and food for wildlife. 1 c. The basin will have uneven, rolling bottom contour for variable water depth to (a) provide foraging areas for species of wildlife feeding in shallow water (0.5 - 3.0 feet) and (b) encourage growth of emergent vegetation in areas of shallow water and thereby increase interspersion of open water with emergent vegetation. r d. The basin will have a layer of topsoil (muck from an existing wetland being filled) on bottom of basin to pro- vide a suitable substrate for aquatic vegetation. e. The basin will have water level control (culverts, riser pipe, etc.) to minimize disturbances of wildlife using the wetland. f. The basin will have fringe of shrubs on upland 11 surrounding the basin to minimize disturbances of wildlife using the wetland. 1 11 11 1 11 1 1 1 ZONING 4 20-422 DIVISION 2. WETLAND ALTERATION PERMIT Part A. General Provisions Sec. 20 -421. Required. 1 The following activities are prohibited in the wetland area indicated unless the city council issues a wetland alteration permit allowing the activity: 1 (1) Scientific research projectsin a class A or class B wetland which alter the wetland. (2) Public works in a class A or class B wetland except for emergency public works which shall not require a wetland alteration permit. (3) Creation of ponds or dams and alterations of the natural drainageways or water courses of a class A or class B wetland. (4) Removal from class A wetland of trees or vegetation except hay, crops and diseased and storm damaged trees and vegetation which shall not require a wetland alteration permit. (5) Docks, walkways and boardwalks, within class A or B wetland. (6) Installing or replacing drain tile or ditches in a class A wetland. Repairing existing drain tile, in a class A wetland if the property has not been in active agricultural use during the twelve (12) months preceding February 19, 1987. 1 (7) Development in any class A wetland or within two hundred (200) feet of a class A wetland that is within the wetland's watershed. (8) Septic or soil absorption systems in a class B wetland. (9) Sedimentation basins in a class B wetland. (10) Any structure in a class A or B wetland except for minor expansion and additions to single - family detached dwellings existing February 19, 1987 that do not require a wetland alteration permit. (11) Digging, dredging, filling in a class A or B wetland. (12) Advertising signs in a class A or B wetland. (Ord. No. 80, Art. V, $ 24(5- 24-7), 12- 15-86) Sec. 20 -422. Application, issuance, etc. The applicant for a wetland alteration permit shall furnish the information required by the city including but not limited to, a site plan, topographic data and hydrological data for the review of a wetland alteration permit application. A wetland alteration permit shall not be issued without having been first reviewed by the planning commission and approved by the council following the review procedures set forth for conditional use permits. The applicant shall have the burden of proving that the proposed use or activity complies with the purposes, intent and other provisions of this article. A permit must be approved by a three -fifths vote of 1191 • Ns me No .mss .•. is Ns or illit am ON .. two MIN a= — — .E 1 • 1 • • t ••_' , •- •4''1 ' • '...., 1.) • _ 1 1 .. 1':A r• •- ' • - n... - 1 \ f • i 1 _F a� {.J 1 " r 1 •T.{�P• s wll.nd• / ` / 1 / I ~ L ,...x '• . ••7-1 1 7 .• � � •`� \ - � , ti • • . r lCMwM•w .••n .nl. / N.:. 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IN SS/ S - - - '- W O ..r AM A.I .. . rI. wan M .11. flow Nye NM � .1 es1.. a .«. 126 cY 6.3C Q1 A[COMM[ND[D /a -M "4"" . es • J \ m rote [11M1 ft WK(D NO M ATTA MAN • ArA.r 1 • \ I . REVI &pIS CERTIFICATION I. S C H O E L L & MAO S O N, INC. OWNER /DEVELOPER PROJECT NAME / SHEET TITLE A. T Y A VISION M.A.** Y.•f.rir.a <._� _ , , � ENGINEERS • SURVEYORS T KORDONOWY A... AIYIes. A/r PLANN • SOIL TESTING - -•— ...�"'�•'— .[ --M- POND GRADING —=—.— �i �tl ., / 10110 WAYZATA ALTO. ___ ' . r ' / NIMM[TOMKA 113•3 g........_1.1A TEMA AA�� I 1.131 ST. -1101 d1T[APRL 1990 "WIIIIEIIII— S.M.I. PROJECT NO. 6130 7 -00 3 SHEET 1 OF 1 SHEETS k LAND DEVELOPMENT APPLICATION CITY OF CHANHASSEN 690 Coulter Drive • Chanhassen, MN 55317 • (612) 937 -1900 APPLICANT: Tom Kordonowy OWNER: Same ADDRESS 3610 South Highway 101 ADDRESS 1 Wayzata, MN 55391 Zip Code Zip Code II TELEPHONE (Daytime) 473 -5435 TELEPHONE REQUEST: Zoning District Change Planned Unit Development Zoning Appeal Sketch Plan Preliminary Plan Zoning Variance Final Plan Zoning Text Amendment Subdivision Land Use Plan Amendment Platting Metes and Bounds Conditional Use Permit Street /Easement Vacation Site Plan Review X Wetlands Permit PROJECT NAME Pond Grading PRESENT LAND USE PLAN DESIGNATION Class B Wetland REQUESTED LAND USE PLAN DESIGNATION Same 1 PRESENT ZONING REQUESTED ZONING 1 USES PROPOSED • SIZE OF PROPERTY LOCATION Tanadona Drive, Chanhassen 1 REASONS FOR THIS REQUEST For construction of a open water wetland basin. Improving the existing wetland for wildlife uses and aesthetic purposes. LEGAL DESCRIPTION (Attach legal if necessary) 1 • WETLAND ALTERATION PERMIT EVALUATION WORKSHEET To Be Completed By Applicant and Submitted with Application (Attach additional sheets if necessary) 1. WETLAND DESCRIPTION: 1 • Size: 1.93 Ac. Class: B Type II Fresh (wet) Meadow Location: Lakeside Streamside Upland X Watershed District: Mi nnehaha Creek Area of Open Water: None 1 Drainage Flows To: Lake Minnewashta Vegetation Types: Predominant population of Canary Reed Grass Soil Types: Clay 2. DESCRIPTION OF PROPOSED ALTERATION: Excavate for a deep • water pond. (Refer to attached report for detailed explanations) 1 1 3. PURPOSE OF PROPOSED ALTERATION; Improve the exisiting wetland as a property amenity and as a wildlife habit. 1 1 4. APPLICABLE WETLAND ORDINANCE SECTION: SEGTiciNS 0.0 — 54/8 1 5. A. DISCUSS THE IMPACTS 'ON THE PROPOSED DEVELOPMENT IF NO ALTERATION IS MADE: None, there is no development involved • with this permit application. 1 1 . • 5. B. IDENTIFY AND DISCUSS OTHER ALTERNATIVES TO WETLAND ALTERATION: None II 1 C. IDENTIFY THE ADVANTAGES AND DISADVANTAGES OF THE PROPOSED ALTERATION: Improve wetland as wildlife habitat and a property amenity_ 1 • 1 6. USING THE WETLAND ORDINANCE STANDARDS AS A GUIDE, DETERMINE 11 WHETHER THERE ARE ANY INCONSISTENCIES BETWEEN THE ORDINANCE AND PROPOSED ALTERATION: No 1 • • r 1 1 . 1 1 1 1 • 1 • • "2— 1 1