B-1 City Code Amendments, Chapter 20, Article VI, Wetland Protection
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone: 952.227.1100
Fax: 952.227.1110
Building Inspections
Phone: 952.227.1180
Fax: 952.227.1190
Engineering
Phone: 952.227.1160
Fax: 952.227.1170
Finance
Phone: 952.227.1140
Fax: 952.227.1110
Park & Recreation
Phone: 952.227.1120
Fax 952.227.1110
Recreation Center
2310 Coulter Boulevard
Phone: 952.227.1400
Fax: 952.227.1404
Planning &
Natural Resources
Phone: 952.227.1130
Fax 952.227.1110
Public Works
1591 Park Road
Phone: 952.227.1300
Fax: 952.227.1310
Senior Center
Phone: 952.227.1125
Fax: 952.227.1110
Web Site
www.ci.chanhassen.mn.us
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MEMORANDUM
TO: Todd Gerhardt, City Manager
FROM:
Lori Haak, Water Resources Coordinator
DA TE:
rJ~
April 23, 2007
RE:
Amendments to City Code Regarding Chapter 20, Article VI,
Wetland Protection
Recommended Action
The Council should review and discuss the proposed code revisions and
recommend any changes to staff. The City Code updates should be scheduled
for a City Council meeting agenda in the near future so they can be adopted
and implemented as soon as practical.
Back2round
At its meeting on April 9, the City Council requested the proposed
amendments to Chapter 20 regarding wetland protection be brought to a
council work session for further consideration.
History
Chanhassen has a long history of wetland protection. The city had a system
for the protection of wetlands before a universal method for wetland boundary
determination was accepted (i.e., the 1987 Army Corps of Engineers Wetland
Delineation Manual) and before a state rule protecting wetlands (i.e., the 1991
Minnesota Wetland Conservation Act) was adopted. In fact, the city may
have adopted the first wetland protection ordinance in the state. Regardless of
whether it was actually the first ordinance, it undoubtedly was among the first
of such ordinances.
The city's first wetland ordinance (Ordinance #47-AR) was adopted on July
23, 1984. It called for protection of all Class A and B wetlands with a
minimum structure setback of 75 feet from the ordinary high water mark of
wetlands. Wetland classes were loosely based on the perceived benefits of the
two different wetland classes. The city revised its wetland ordinance
significantly (Ordinance #180) on December 14, 1992 with the approval of
reduced wetland setbacks (from 75 feet to 40 feet) in exchange for wetland
The City of Chanhassen · A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play
buffer dedication (10 to 50 feet wide on average, dependent on the wetland's
classification). Additionally, the 1992 ordinance revisions codified strategies for
evaluating and managing wetlands divided into 3 classes, which were based on the
functions and values they provided.
Slight modifications have taken place since 1992 (namely eliminating buffer width
averaging to reduce confusion among neighbors); however, that ordinance is still
predominantly intact. The current recommendations are consistent with the city's historic
perspectives on the functions and values of wetlands as natural resources and open
spaces.
Other Communities
Below are wetland buffer and setback requirements from 12 municipalities and 1
watershed district. This table has been updated in light of new information that has been
received from some of the municipalities.
Buffer Buffer
City Setback (Low) (High) TOTAL Notes
Apple Valley 0* 15 15 15-15 *3' vertical separation from OHW
Burnsville 0 20 20 20-20 (have a call in)
Chanhassen 40 20 50 60-100 Draft standards
Eagan 25 20 75 45-100 Draft standards
Eden Prairie 15 25 50 40-65 Alternative standards available
Lakeville 10-33 17 50 27 -83
Maple Grove 20-30* 10 40 30-70 *New information
Maplewood 10 20 100 30-110
Minnehaha Creek 0 16.5 35 16.5-35 Watershed district
Minnetonka 10-35* 16.5 50 26.5-85 *New information
Plymouth 15 10 100 25-115 Alternative standards available
Savage 15-25* 16.5 50 31.5-75 *New information
Woodbury 25 25 75 50-100
Additional Options for Protecting: Outstanding: Resources
During the City Council meeting on April 9, 2007, staff mentioned that, in addition to the
wetland buffer and setbacks proposed for Outstanding wetlands, City staff intends to
recommend that the 2008 Comprehensive Plan anticipate establishment of an overlay
district to facilitate the protection of Assumption Creek/Seminary Fen. This overlay
district could incorporate:
1. Limits on the extent and types of impervious surfaces;
2. Regulation of the thermal impacts of stormwater discharge;
3. Protection of slopes contributing to the resources;
4. Preservation of subsurface drainage patterns;
5. Emphasis on native vegetation introduction and sustainable yard management;
6. Dedication of easements and/or outlots;
7. Pretreatment of stormwater prior to discharge into the fen and creek;
8. Maintenance of natural communities;
9. Restriction of unnatural inputs to the site (chlorides, fertilizer, etc.); and
10. Stormwater rate and volume control.
If the City proceeds with the process of adopting an overlay district, there would be a
significant amount of public and technical input.
Recommendation
Below are the staff recommendations, as well as general ranges, for wetland buffer
widths and wetland setbacks.
Wetland Buffer Wetland Setback
Width Required {Principal}
BWSR General
Wetland Staff Draft Acceptable Staff General
Classification Recommendation Mgmt. Std. Range Recommendation Range*
Outstanding 50 Not 50-100+ 50 0-50
addressed
Preserve 40 50-100+ 50-100+ 40 0-40
Manage 1 30 35-50 25-50 40 0-40
Manage 2 25 25-35 20-35 40 0-40
Manage 3 20 25 16.5-25 40 0-40
* Range of wetland buffer setbacks generally required by metropolitan cities in Minnesota.
As discussed at the April 9 Council meeting, the accessory structure setback would be
50% of the principal structure setback for all wetland classifications except Outstanding.
This is reflected in the draft code revisions (Attachment 3).
Attachments
1. Existing and Proposed Wetland Classifications
2. Proposed Buffers and Setbacks
3. Proposed code revisions to Chapter 20, Article VI, Wetland Protection
4. Examples of Proposed Wetland Buffer and Setback Requirements (table)
G: Single family home in Minnewashta Creek 2nd Addition
H: Single family home in Trotters Ridge Addition
I: Single family home in Hidden Creek Estates 1st Addition
J: Single family home in Meadows at Longacres 4th Addition
K: Commercial development in Galpin Business Park
L: Industrial development in Park Two 2nd Addition
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Proposed Wetland Buffer Strips and Setbacks
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Principal Structure Accessory Structure Permanent Buffer Percent of Buffer
Wetland Setback from Buffer Setback from Buffer Strip Minimum Strip in Native
Classification Edae (feet) Edae (feet) Width (feet) Vegetation
Outstanding 50 50 50 100%
Preserve 40 20 40 100%
Manage 1 40 20 30 100%
Manage 2 40 20 25 Over 50%
Manage 3 40 20 20 Over 50%
G:\ENG\Lori\Surface Water\2006 SWMP Update\Code Updates\CC 042307\Wetland\Proposed Buffers and Setbacks. doc
CHAPTER 20, ZONING.
Repeal Sections 20-401 through 20-418.
ARTICLE VI. WETLAND PROTECTION.
Sec. 20-401. Findings intent; rules adopted by reference.
(a). Wetlands help maintain water quality, serve to reduce flooding and erosion, act as
sources of food and habitat for a variety of fish and wildlife, and are an integral part of
the community's natural landscape. Wetlands provide the aesthetic benefits of open space
and can be used to provide a natural separation of land uses. It is the intent of this
ordinance to establish a policy of sound stewardship through coordination of regulations
that conserve, protect, enhance, and result in the no net loss of these environmentally
sensitive resources. In addition, it is the intent of the city to promote the restoration of
degraded wetlands.
(b). The intent of this ordinance is to avoid alteration and destruction of wetlands. When
this is not feasible, mitigation must be provided to recreate the function and value of the
lost or altered wetlands.
(c). This ordinance is adopted in part to implement the Wetland Conservation Act of
1991, as amended (M.S. S 103F.612 et seq.), and the accompanying rules of the
Minnesota Board of Water and Soil Resources (Minnesota Rules Chapter 8420, as
amended).
(d). This ordinance incorporates by reference the act and the rules. Terms used in this
ordinance which are defined in the act or the rules have the meanings given there.
Sec. 20-402. Purpose.
The purpose of this ordinance is to assure the general health, safety, and welfare of the
residents through preservation and conservation of wetlands and sound management of
development by:
(1). Conducting an inventory and classification of all wetlands within the city and
maintaining a comprehensive set of official city maps depicting the approximate location
and extent of wetlands.
(2). Establishing wetland regulations that are coordinated with water quantity and water
quality goals and policies of the Chanhassen Surface Water Management Plan.
(3). Requiring sound management practices that will protect, conserve, maintain,
enhance and improve the functions and values of wetlands within the community.
Page 1 of 13
(4). Requiring measures designed to maintain and improve water quality in streams and
lakes.
(5). Protecting and enhancing the scenic value of wetlands.
(6). Restricting, controlling and mitigating the harmful effects of development on
wetlands.
(7). Allowing only development that is planned to be compatible with wetland protection
and enhancement.
(8). Providing standards for the alteration of wetlands when alteration is allowed.
(9). Educating and informing the public about the numerous benefits and features of
wetlands and the impacts of urbanization.
(10). Obtaining protective easements over or acquiring fee title to wetlands as
appropriate.
Sec. 20-403. No net loss.
(a). To achieve no net loss of wetland, except as provided under sections 20-417 and 20-
418 of this ordinance or authorized by a wetland alteration permit issued by the city, a
person may not drain, grade, excavate, fill, bum, remove healthy native vegetation, or
otherwise alter or destroy a wetland of any size or type. Any alteration to a wetland
permitted by a wetland alteration permit must be fully mitigated so that there is no net
loss of wetlands.
(b). Wetlands shall be subject to the requirements established herein, as well as
restrictions and requirements established by other applicable city ordinances and
regulations. The wetland protection regulations shall not be construed to allow anything
otherwise prohibited in the zoning district where the wetland area is located.
(c). All activities within the City shall comply with the Wetland Conservation Act of
1991, as amended (M.S. S 103F.612 et seq.), and the accompanying rules of the
Minnesota Board of Water and Soil Resources (Minnesota Rules Chapter 8420, as
amended). Where the requirements of City Code differ from those requirements, the
more restrictive shall apply.
Sec. 20-404. Official wetland map.
(a). The City shall maintain the official City Wetland Inventory, which is hereby adopted
by reference. An electronic copy of this map shall be maintained on the City's
Geographic Information System (GIS) database, with both hard and electronic copies
being made available for public review upon request.
Page 2 of 13
(b). The City Wetland Inventory shall identify each basin as one of four management
categories: Preserve, Manage 1, Manage 2, and Manage 3. These classifications will be
determined using Figure 1.1 "Wetland Management Classification Process Flowchart for
Basic Wetland Protection" from Minnesota Routine Assessment Method for Evaluating
Wetland Functions (MnRAM Version 3.0), or future versions.
(c). The presence or absence of a wetland on the City Wetland Inventory does not
represent a definitive determination as to whether a jurisdictional wetland that would be
covered by this ordinance is present. Wetlands identified during a site-specific
delineation, but not identified by the City Wetland Inventory, are still subject to the
provisions of this ordinance.
(d). The City Wetland Inventory does not depict delineated wetland boundaries and shall
not be used as such.
(e). The City Wetland Inventory shall be amended to include any wetlands discovered
during the site review process.
Sec. 20-405. Wetland delineation.
(a). It is the responsibility of the project applicant to determine whether a wetland exists
on a subject property. It is the responsibility of the applicant to complete a wetland
delineation and submit sufficient documentation of the wetland boundary to the city in a
Wetland Delineation Report. Wetland delineations shall be completed by, or under the
direct supervision of, a Certified Wetland Delineator. Three (3) hard copies of the
Wetland Delineation Report must be submitted to the city's WCA agent. Additionally,
an electronic copy of the delineated wetland boundaries must be submitted in a format
compatible with the city's GIS database. Wetland delineations shall be valid for three
years. Wetland delineations completed more than three (3) years prior may be confirmed
and/or updated by a qualified wetland professional through a site visit and submittal of a
summary of the findings, a copy of the old delineation and a map depicting both the
original and revised wetland boundaries, where applicable.
(b). Wetland delineations do not need to be completed for properties adjacent to a
proposed development that is under separate ownership. However, sufficient information
must be presented to demonstrate that any proposed activities shall not directly or
indirectly impact adjacent basins. The applicant shall review readily available
information including, but not limited to, the City Wetland Inventory, National Wetland
Inventory maps, topographic maps, soil survey maps, and recent and historic aerial
photographs in preparing this assessment.
Sec. 20-406. Wetland classification.
(a). All wetlands delineated under section 20-405 of this ordinance that have not been
previously classified shall be classified using the results from the Minnesota Routine
Page 3 of 13
Assessment Method for Evaluating Wetland Functions (MnRAM Version 3.0), or future
verSIOns.
(b). A MnRAM shall be completed by the property owner or applicant for each
previously unclassified wetland. An electronic version of the MnRAM evaluation must
be submitted to and approved by the city to establish the classification of each wetland
prior to any alteration or impact to the wetland.
(c). MnRAM 3.0 assessments have been completed by the City as a component of the
City Wetland Inventory. Applicants; however, may appeal the determination, and submit
a request to change the classification. To do so, the applicant must submit an electronic
copy of the MnRAM for each affected basin to the WCA agent. The forms must be filled
out by a qualified wetland scientist. The WCA agent will consult with the technical
evaluation panel to determine if a change in the classification is warranted. In all cases,
the burden to demonstrate the need for a change in classification lies with the applicant.
Sec. 20-407. Permit required.
(a). No person shall drain, excavate in the permanent or semipermanent flooded areas of
open water wetlands, or fill a wetland, wholly or partially, or otherwise impact wetlands
without first having a wetland replacement plan or other determination approved by the
city. Draining, grading, excavating, filling, removing healthy native vegetation, or
otherwise altering or destroying a wetland of any size or type not subject to an exemption
under section 20-417 of this chapter requires a wetland alteration permit. Activity in a
wetland requiring a wetland alteration permit includes, but is not limited to:
(1). Construction of new streets and utilities.
(2). Creation of ponds or dams and alterations of the natural drainageways of water
courses. This shall only be allowed as part of a mitigation project, or to restore or
improve the function and value of the wetland.
(3). Installation of boardwalks and docks. Docks shall meet the additional
requirements in Chapter 6, Article II of the Chanhassen City Code.
(4). Discharge of untreated stormwater runoff into wetlands.
(5). Changes in wetland hydrology that result in an increase in the ordinary high
water level of a wetland by more than 12 inches.
(b). The city must be notified at least five business days prior to the use of any form of
treatment of wetlands to control nuisance vegetation including chemically treating,
burning, mowing or biologically treating wetlands.
(1). At the time of notification, a person or company will be required to supply the
following information:
Page 4 of 13
a. Location of wetland;
b. Area of wetland to be treated;
c. Name, address and telephone number of the party responsible for treatment;
d. Name, address and telephone number of person or persons performing the
treatment;
e. Date of treatment;
f. A list of the type of treatments to be used at such time;
g. A statement indicating an understanding of the treatment being applied and its
effect on humans, plants and wildlife; and
h. A signed consent from all property owners owning property containing or
abutting wetland to be treated.
(c). The following activities shall be determined exempt from the provisions listed in
subpart (b) above:
(1) Federal, state or local government staff or contractors during the course of
conducting maintenance activities; and
(2) Metropolitan Mosquito Control District during the course of conducting mosquito
control activities.
Sec. 20-408. Exemptions from earth work permit requirements.
Earth work completed in accordance with an approved wetland alteration permit is
exempt from the requirement to obtain a separate earth work permit.
Sec. 20-409. Permit application requirements and decisions.
(a). A wetland alteration permit shall not be issued without having been first reviewed by
the planning commission and approved by the city council following the review and
hearing procedures set forth for conditional use permits and the additional requirement of
Minnesota Rules 8420.0230. The applicant shall have the burden of proving that the
proposed use or activity complies with the purposes, intent and other provisions of this
ordinance. The council may establish reasonable conditions which are specifically set
forth in the permit to ensure compliance with requirements contained in this ordinance.
Such conditions may, among other matters, limit the size, kind or character of the
proposed work; require the construction of other structures; require replacement of
vegetation and wetland functions and values; establish required monitoring procedures
and maintenance activities; stage the work over time; require the alteration of the site
design to ensure buffering; and/or require the provision of a performance security.
(b). Any projects seeking a wetland alteration permit subject to this ordinance will be
required to submit the following:
(1). A wetland alteration permit application
(2). A site/grading plan of the entire property
(3). Existing and proposed drainage areas to wetlands
Page 5 of 13
(4). A wetland delineation report in accordance with section 20-405
(5). Wetland classification information in accordance with section 20-406 for each
wetland on property
(6). Buffer strip plan meeting the criteria of section 20-411 (c) and (d)
(7). Submittals required by the Wetland Conservation Act
(8). Topographic data
(9). Other information as required by the city
(c). Decisions made under this ordinance that fall under the authority of the Minnesota
Wetland Conservation Act may be appealed to the Minnesota Board of Water and Soil
Resources under Minnesota Rules 8420.0250, after administration appeal rights under the
official controls have been exhausted. Staff costs to the city associated with appeals shall
be borne by the applicant.
(d). The city council shall appoint a person to serve on a technical evaluation panel. The
person must be a technical professional with expertise in water resources management.
Decisions under this ordinance must not be made until after receiving the determination
of the technical evaluation panel regarding wetland public values, location, size, and/or
type if the city council, the landowner, or a member of the technical evaluation panel asks
for such determinations. This requirement does not apply to wetlands for which such data
is included in an approved comprehensive wetland management plan per Minnesota
Rules 8420.0240. The city council may seek and consider recommendations, if any, made
by the technical evaluation panel in making replacement plan decisions. Unless
otherwise designated, the city's representative on the technical evaluation panel shall be
the WCA agent.
(e). The applicant for a wetland alteration permit is responsible for obtaining all other
necessary permits including but not limited to those required by watershed districts,
Minnesota Department of Natural Resources, United States Army Corps of Engineers and
Minnesota Pollution Control Agency prior to commencement of the permitted work.
Sec. 20-410. General standards.
(a). The following standards apply to all lands within and abutting a wetland:
(1). Septic and soil absorption system must be a setback minimum of 75 feet from
the ordinary high water mark of the wetland.
(2). The lowest ground floor elevation of a principal structure is three feet above the
100-year flood elevation of the wetland.
(3). Access across a wetland shall be by means of a boardwalk or elevated structure
and only upon approval of a wetland alteration permit. Wetland crossings must also
be in conformance with all other state regulations.
Page 6 of 13
(4). Docks and boardwalks shall be elevated a minimum of six inches above the
ordinary high water mark. Docks and boardwalks shall only be permitted to cross
wetlands in instances where a wetland is riparian to a lake.
(5). The erosion and sediment control goals and policies within the city's Surface
Water Management Plan shall be met.
(6). Stormwater runoff shall not be discharged into wetlands without water quality
pretreatment as prescribed by Chanhassen City Code.
(b). When a wetland alteration permit is issued allowing wetland alteration, the
following standards shall be followed:
(1). The alteration will not have a net adverse effect on the ecological and
hydrological characteristics of remaining wetland.
(2). It shall be located as to minimize the impact on vegetation.
(3). It shall not adversely change water flow.
(4). The size of the altered area shall be limited to the minimum required for the
proposed action.
(5). The disposal of any excess material is prohibited within remaining wetland
areas.
(6). The disposal of any excess material shall include proper erosion control and
nutrient retention measures.
(7). Alterations to any wetland area are prohibited during waterfowl breeding season
or fish spawning season, unless it is determined by the city that the wetland is not
used for waterfowl breeding or fish spawning.
(8). Alterations to wetland areas shall be mitigated in accordance with the
requirements of this ordinance if the activity results in a loss of wetland area and/or
function and value of the wetland.
(9). Dedicated buffers in accordance with section 20-411.
Sec. 20-411. Placement of structures.
(a). For lots created on or after (date of codification), a buffer strip shall be maintained
abutting all wetlands. All existing vegetation adjacent to a wetland shall be left
undisturbed and applied toward the buffer strip unless otherwise approved by the WCA
agent or city council. Buffer strip vegetation shall be established and maintained in
accordance with the following requirements. If the buffer strip is disturbed, native plant
species shall be selected from wetland and upland plants to provide diverse habitat for
various species of wildlife. Buffer strips shall be identified by permanent monumentation
acceptable to the city. A minimum of one wetland buffer monument is required per lot
abutting the wetland edge. The maximum spacing between monuments is 300 feet.
(b). The following table provides the minimum standards required for each wetland
classification.
Page 7 of 13
Principal Structure Accessory Structure Permanent Buffer Percent of Buffer
Wetland Setback from Setback from ButTer Strip Minimum Strip in Native
Classification Buffer Edge (feet) Edge (feet) Width (feet) Vegetation
Outstanding SO SO SO 100%
Preserve 40 20 40 100%
Manage 1 40 20 30 100%
Manage 2 40 20 25 Over 50%
Manage 3 40 20 20 Over 50%
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(c). For lots created on or after (date of codification), principal structures and
accessory structures shall maintain minimum setbacks from the wetland buffer as
outlined in subparagraph (b) above.
(d). If buffer strips and setbacks were approved in conjunction with a site plan or
subdivision before (date of codification), the standards set forth in the site plan or
subdivision shall prevail, except that in no case shall principal structures be set back
less than 40 feet from the wetland edge unless a variance from the wetland setback
requirements has been approved.
(e). For lots of record before (date of codification), property owners may establish
wetland buffer strips in compliance with subparagraph (b) above in exchange for a
decreased setback for structures. A wetland buffer agreement describing the
precise location and extent of the buffer strip, as well as the restrictions for activities
within the buffer strip, shall be signed by the property owner and the city and shall
be recorded against the property at the county recorder's office. The property
Page 8 of 13
owner shall be responsible for all costs and fees associated with the buffer strip
dedication.
1. Following the recording of the wetland buffer agreement with the county
recorder's office, accessory structures may be placed within the last 20 feet
or 50% of the existing principal structure wetland setback, whichever is less.
(e 1). In addition to the requirements above, wetland buffer strips for wetland mitigation
areas and those counted as Public Value Credit (PVC) shall also conform to the minimum
standards as set forth by the Wetland Conservation Act.
(f). No structures are to be placed within the vletland setback.
(g). The locations of buffer strips and wetland setbacks shall be surveyed and included on
the Certificate of Survey. A Certificate of Occupancy shall not be issued unless this task
is completed and approved by City staff.
(h). Retaining walls and fences may be located within wetland setbacks. Neither
retaining walls and fences nor the land alteration that takes place as part of construction
shall encroach into the required buffer strips.
Sec. 20-412. Buffer strips required.
(a). Before release of final plat, the applicant must submit to the WCA agent a drainage
and utility easement for protection of the wetland and approved buffer strip. The
easement must describe the boundaries of the wetland and the wetland buffer strips
(b). Building structures, paving, mowing, introducing non-native vegetation, cutting,
filling, dumping, disposing of yard waste, fertilizing, or tampering with the monuments
within buffer strips is prohibited.
(c). Additional wetland impacts shall not be allowed for the creation of buffer strips.
(d). The use of meandering buffer strips to maintain a natural appearance is encouraged
(e). Where roadways are constructed next to a wetland, a buffer strip shall be maintained.
(f). Where acceptable natural vegetation exists in a wetland and adjacent buffer strip, the
retention of such vegetation in an undisturbed state shall be required unless the applicant
receives approval to replace such vegetation. A wetland and/or buffer strip has
acceptable vegetation if it is dominated by native tree, shrub, or grass species, and has not
been used for agricultural production in the last five years.
(g). The WCA agent may deny the use of existing vegetation for the use of buffer strips
if:
Page 9 of 13
1. It is dominated by any species on the state noxious weed list as defined by
Minnesota Statutes, Section 18.76-18.88. These species include species such as
leafy spurge, spotted knapweed, purple loosestrife, and common and glossy
buckthorn;
2. It is present on unstable slopes, has significant bare soil, displays a history of
erosion problems, is prone to gully formation, or does not function for sediment
and nutrient removal;
3. Any areas were used for agricultural production in the last five years; or
4. The buffer strip is disturbed or altered.
(h). If an area is deemed to be unacceptable in its current state, wetland buffer
landscaping plan must be submitted to the WCA agent. This plan shall include at a
minimum:
1. A plan sheet showing the proposed new buffer strip locations and any buffer
strips acceptable as existing. Existing buffer strips shall be identified and marked
to prevent accidental disturbances.
2. A specification as to what seed mixture will be used, or what trees and/or shrubs
will be planted and their locations.
3. A verification that all seed stock and tree species are native to Minnesota and are
of local ecotypes.
4. A detailed specification that identifies the project schedule, materials, installation
or seeding instructions, and costs.
5. A maintenance schedule that describes the activities that will occur for at least the
first two (2) years. This should include a schedule of mowing and spot spraying
for weeds if an area is seeded. Plans that call for periodic burning shall have
additional details and must have special permission prior to installation.
6. A detail of all Best Management Practices (BMPs) and erosion control plans.
7. A plan identifying the locations of buffer strip markers.
8. An electronic copy of plans in a format compatible with the City GIS database.
(i). The city may, at their discretion, require a cash escrow or letter of credit up to 110%
of the cost to reestablish the buffer strip should it not be successful, not be maintained, or
otherwise require city intervention to maintain the ordinance requirements.
Sec. 20-413. Wetland alteration.
(a). An applicant for a wetland alteration permit must demonstrate that the activity
impacting a wetland has complied or, through imposition of conditions of approval, will
comply with all of the requirements of the Wetland Conservation Act.
(b). A wetland alteration permit shall not be issued unless the proposed development
complies with this article.
(c). When a wetland alteration permit is issued allowing wetland alteration, the alteration
must be consistent with the city's Surface Water Management Plan and the Wetland
Page 10 of 13
Conservation Act. The alteration shall not alter the hydrological patterns in the remainder
of the wetland, if a portion of the wetland remains, unless exempted under section 20-
417.
Sec. 20-414. Wetland management activities.
Prior to commencement of a wetland management activity, an administrative wetland
permit must be obtained for the activity in accordance with section 20-415.
Sec. 20-415. Administrative wetland permit.
(a). Applications for administrative wetland permits shall be made on a form supplied by
the city. A fee shall be paid as set forth in Chanhassen City Code. The WCA agent shall
review applications to ensure proposed activities are in compliance with the Wetland
Conservation Act and the requirements of this ordinance and are consistent with
approved and/or accepted wetland management practices.
(b). Activities for which administrative wetland permits are approved shall not contribute
to nuisances as defined in the Chanhassen City Code.
Sec. 20-416. Mitigation.
(a). Mitigation intent. Where a wetland alteration permit is approved and mitigation is
required pursuant to City Code and the Wetland Conservation Act, mitigation must result
in an improvement to the wetland function and value. Mitigation plans must address
water quality, improvement, and maintenance of preexisting hydrological balance and
wildlife habitat. The wetland function and value will include improvement of water
quality, maintaining hydrological balance, and provision of wildlife habitat. Mitigation
will be performed at ratios required by the Minnesota Wetland Conservation Act to
achieve replacement of the wetland function and value.
(b). Mitigation standards. The functions and values of mitigation wetlands shall be
achieved through wetland restoration, creation and/or enhancement. The mitigation
standards found in Minnesota Rules 8420.0550 shall be followed.
(1). Mitigation shall be subject to wetland setback and buffer strip requirements as
set forth in this ordinance.
(2). Mitigation shall at a minimum replace preexisting wetland function and
values through the ratios set forth in Minnesota Rules 8420.0541.
(3). Wetland mitigation shall be undertaken on-site. If this is not feasible, then
mitigation may occur locally within the subwatershed. If this is not possible, then
mitigation ,au occur outside the subwatershed, elsewhere in the city. If mitigation
cannot be accomplished on site, or if the city deems it necessary to perform
mitigation off-site, then the applicant shall be responsible for providing off-site
Page 11 of 13
mitigation within the major subwatershed, as designated by the Minnesota
Wetland Conservation Act, or purchasing wetland credits from the state wetland
bank.
(d). Construction management and long tenn wetland maintenance.
(1). The wetland alteration permit holder shall follow best management practices
to minimize direct impacts due to erosion and construction practices and to
safeguard wildlife habitat.
(2). The wetland alteration permit holder shall submit an annual report to the city
for replacement wetlands in Chanhassen. The purpose of the annual report is to
describe actual wetland management, restoration or creation activities completed
during the past year as well as activities planned for the upcoming year. The
annual report shall include all the information required of annual monitoring
reports by Minnesota Rules 8420.0620 subpart 2.
The wetland alteration permit holder shall submit annual monitoring reports as
required by Minnesota Rules 8420.0610. Submission shall continue for five years
or until the replacement wetland is deemed by the Technical Evaluation Panel
(TEP) to be fully functional. Where feasible, the city shall require the wetland
alteration permit holder to satisfy long-term management requirements.
(e). Mitigation Surety. To ensure that the proposed wetland replacement occurs, the city
shall hold either a cash escrow or letter of credit equal to 110% of the current value of
wetland credits on the open market. An additional escrow account shall be established to
ensure that the required monitoring occurs. The monitoring escrow shall be set at 110%
of the current average monitoring expense as performed by an independent consultant.
The monitoring and replacement escrows may be released incrementally as monitoring
and replacement are successfully completed. The remaining escrow amount will be
returned and the letter of credit terminated upon completion of the monitoring and
approval by the Technical Evaluation Panel (TEP). Any interest earned by holding of a
cash escrow shall be the property of the city.
(f). Within the Minnehaha Creek Watershed District, 1: 1 mitigation is required for
excavation within wetlands.
Sec. 20-417. Exemptions and no loss determinations.
(a). Activities exempted by Minnesota Rules 8420.0122 or determined to result in no net
loss of wetlands shall be exempted from the provisions of this ordinance. However,
certificates of exemption or no loss must be obtained from the city prior to starting work.
(b). A person conducting an activity in a wetland under an exemption shall ensure that:
(1). Appropriate erosion and sediment control measures are taken to prevent
sediment discharges from the site;
Page 12 of 13
(2). The activity does not block fish activity in a watercourse; and
(3). The activity is conducted in compliance with all other applicable federal,
state, and local requirements, including best management practices as listed in
part 8420.0112, and water resource protection requirements established under
M.S. Ch. 103H.
Sec. 20-418. Variances.
Variances from the requirements of this ordinance may be granted in accordance with the
variance provisions of Article II, Division 3 of this chapter so long as the variances do
not violate the Wetland Conservation Act and rules adopted under the Act.
Sec. 20-419. Expiration and renewal of permit.
(a). Unless otherwise specified by the city council, the permittee shall begin and complete
the development authorized by the wetland alteration permit within one year after the
date the council approves the permit application.
(b). The permittee shall provide written notice to the city 24 hours prior to the
commencement and completion of the permitted project. No project shall be deemed to
have been completed until approved by the city after receipt of notice of completion.
(c). If the permittee fails to commence work within the time specified in this section, the
permit shall be void. The permittee may make a written application to the city council for
an extension of the time to commence work, but only if the permittee submits the
application prior to the date already established to commence work. The application of an
extension shall state the reasons the permittee requires an extension. If the council does
not extend the permit, the holder of the void permit may apply for a new permit.
Sec. 20-420. Inspection of work.
The city may cause inspection of work for which a wetland alteration permit is issued, at
the applicant's expense, to be made periodically during the course of such work and shall
cause final inspection to be made following the completion of the work.
Sec. 20-421. Enforcement procedures.
(a). Violation of this article, wetland protection, or of the terms of a permit issued
thereunder shall be a misdemeanor.
(b). Any person who alters a wetland in violation of this article shall apply for a wetland
alteration permit and shall pay a filing fee double the regular fee. The city council may
require the violator to restore the wetland or take other mitigative measures.
Page 13 of 13
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Minnewashta Creek 2nd Addition
Approved 1979
Buffer = None
Setback::: 75' minimum (all structures)
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(,~ 25 b"" \'fer l:i Jea."v,-kdj
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DEMARS... GABRIEL
LAND SURVEYORS, INCo
3030 Harbor Lane No.
P!ymouth. MN 55447
Phone: (612) 559-0908
N52258
J hereby certify that this is a true and correct representation at a survey of
the boundaries of the above described land and of the location of aU buildings,
if any, thereon, and aU visible encroachments, if anv, from or on said land.
File No.
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Book - Page
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Minn. Reg. No. Goo 4- i
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Buffer = None
Setback = 40' minimum (all structures) ,
L~ ~-.: - I fro (leset! o..~ces<!,.cYY. ~+-r~~ Sf'- t-bo..ck ( ; \. Z ~'\ ; 4e 1-
Denotes iron monument -. _ f"'o~~ea 251 hv~-w- b\J\tar is dedlc
Denotes offset stake
Denotes existing elev ~
Denotes proposed elev. BENCHMARK: a;p o/' /ro/? 6"&/ r;iJ b4-'/ /d//?0? k/)e /~/~/
Denotes surface drainage O/7d /?':JC?/Red /;(g,n-(// CJO #?/$ ~dry'C'y 6e;/c7//C;?= 96.5 ?/
Proposed garage floo~ elev.= 7'/3 7 . . J' . ~ . ,
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Legal Description
Lot 6, Block 1, TROTTERS fUDGE ADD!TIOf'J
Trotters Ridge Addition
Approved 1993
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