CC Staff Report 8-13-07
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
YNrW.ci .chanhassen. mn .us
ib-3
MEMORANDUM
TO:
Todd Gerhardt, City Manager
o~.
FROM:
Alyson Fauske, Assistant City Engineer
DATE:
August 13,2007
SUBJ:
Tanadoona Drive Stormwater Pond
Request for a Wetland Alteration Permit
Planning Case 07-27
EXECUTIVE SUMMARY
The City is proposing the creation of a storm water pond in conjunction with the
Tanadoona DrivelDogwood Road reconstruction project on the northwest corner of
Tanadoona Drive and Dogwood Road. The proposed pond will impact
approximately 0.05 acres (2,100 square feet) of wetland. Wetland bank credits are
proposed for the wetland mitigation; 0.05 acres of public value credit and 0.05
acres of new wetland credit.
ACTION REQUIRED
City Council approval requires a majority of City Council present.
PLANNING COMMISSION SUMMARY
The Planning Commission held a public hearing on August 7, 2007, to review the
proposed wetland alteration. The Planning Commission voted four for and none
against a motion recommending approval. The Planning Commission had no issues
or concerns with the proposal.
RECOMMENDATION
Staff recommends adoption of the motion as specified on page 6 in the staff report
dated August 7, 2007 approving the wetland alteration permit to alter 2,100
square feet of wetland.
A TT ACHMENTS
1. Wetland Alteration permit.
2. Planning Commission Staff Report Dated August 7, 2007.
3. Planning Commission Minutes of August 7, 2007.
g:\plan\2007 planning cases\07-17 tanadoona drive wap\executive summary.doc
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.
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
WETLAND ALTERATION PERMIT #07-17
1. Permit. Subject to the terms and conditions set forth herein, the City of Chanhassen
hereby grants a wetland alteration permit for the following use:
Excavation and maintenance of a stormwater pond, altering 2,100 square feet of
wetland, for the purpose of improving water quality in the Lake Minnewashta
watershed.
2. Property. The permit is for property situated in the City of Chanhassen, Carver County,
Minnesota, and legally described as follows: Part of Government Lot 9, Carver County, Minnesota.
3. Conditions. The Wetland Alteration Permit was approved subject to the following
conditions:
a. Erosion control blanket shall be installed on all slopes greater than or equal to 3: 1. All
exposed soil areas shall have temporary erosion protection or permanent cover year
round, according to the following table of slopes and time frames:
Type of Slope
Steeper than 3: 1
10:1 to 3:1
Flatter than 10: 1
Time
7 days
14 days
21 days
(Maximum time an area can
remain open when the area
is not actively being worked.)
b. These areas include constructed storm water management pond side slopes, and any
exposed soil areas with a positive slope to a storm water conveyance system, such as a
curb and gutter system, storm sewer inlet, temporary or permanent drainage ditch or other
natural or man made systems that discharge to a surface water.
c. A minimum of six trees will be planted on site. Native species shall be used.
d. Tree protection fencing shall be installed at the edge of grading limits prior to any
construction activity.
e. Tree removal limits shall be inspected by the Environmental Resources Specialist prior to
any removals.
4. Termination of Permit. The City may revoke the permit following a public hearing for
violation of the terms of this permit.
5. Lapse. If within one year of the issuance of this permit the authorized construction has
not been substantially completed or the use commenced, this permit shall lapse, unless an extension
is granted in accordance with the Chanhassen Zoning Ordinance.
1
6. Criminal Penalty. Violation of the terms of this conditional use permit is a criminal
misdemeanor.
Dated: August 13,2007
CITY OF CHANHASSEN
By:
Thomas A. Furlong, Mayor
SEAL
By:
Todd Gerhardt, City Manager
STATEOFMINNESOTA )
( ss
COUNTY OF CARVER )
The foregoing instrument was acknowledged before me this _ day of
2007, by Thomas A. Furlong, Mayor and Todd Gerhardt, City Manager, of the City of Chanhassen,
a Minnesota municipal corporation, on behalf of the corporation and pursuant to authority granted
by its City Council.
Notary Public
DRAFfED BY:
City of Chanhassen
7700 Market Boulevard
P.O. Box 147
Chanhassen, MN 55317
(952) 227-1100
2
PC DATE:
August 7, 2007
1
CC DATE:
August 13, 2007
CITY OF CHANHASSEN
REVIEW DEADLINE:
September 4, 2007
CASE #:
07-17
BY:
AF, BG, JS, KT
STAFF REPORT
PROPOSAL: Tanadoona Drive Stormwater Pond:
Request for a Wetland Alteration Permit.
APPLICANT
LOCATION:
3300 Tanadoona Drive
APPLICANT:
City of Chanhassen
Attn: Paul Oehme
7700 Market Boulevard
P. O. Box 147
Chanhassen, MN 55317
(952) 227-1169
PRESENT ZONING:
Rural Residential District, RR
2020 LAND USE PLAN:
Public/Semi-Public
ACREAGE:DENSITY:
Not Applicable
SUMMARY OF REQUEST:
The City is proposing a stormwater pond as part of the public
improvement project for Dogwood Road and Tanadoona Drive, which impacts an existing
SITE DATA
wetland.
LEVEL OF CITY DISCRETION IN DECISION-MAKING:
The City’s discretion in approving or denying a wetland alteration permit is limited to whether or
not the proposal meets the standards outlined in the Zoning Ordinance. If it meets these
standards, the City must approve the wetland alteration permit. This is a quasi-judicial decision.
Location Map
Wetland Alteration Permit
3300 Tanadoona Drive
Planning Case No. 07-17
City of Chanhassen
3601
7140
Lake Minnewashta
SUBJECT
PROPERTY
3300
Tanadoona Drive
7301
7311
7321
Dogwood Rd 3301
7331
7341
7401
3241
7431
7460
7480
Dogwood Rd
7530
3121
7537
7550
7560
7570
76207780
Tanadoona Drive Wetland Alteration Permit
Planning Case 07-17
August 7, 2007
Page 2 of 7
PROPOSAL/SUMMARY
The City is proposing the creation of a stormwater pond in conjunction with the Tanadoona
Drive/Dogwood Road reconstruction project on the northwest corner of Tanadoona Drive and
Dogwood Road. The proposed pond will impact approximately 0.05 acres (2,100 square feet) of
wetland. Wetland bank credits are proposed for the wetland mitigation; 0.05 acres of public
value credit and 0.05 acres of new wetland credit. In designing the project the consultant, Kimley-
Horn and Associates, Inc., investigated the use of an environmental manhole, a rounded stormwater
pond (option 1) which would impact approximately 6,000 square feet of wetlands, and a narrow
pond (option 2) alternative that reduced the wetland impacts to approximately 2,100 square feet.
The environmental manhole was designed to serve as a sediment removal device for particles as
small as 125 microns in diameter. However, it would not have the capability to remove smaller
particles or nutrients from the runoff and would not provide any type of rate control.
The option 1 pond minimized the pond surface area and requires a smaller permanent drainage and
utility easement, but impacts a larger area of wetland. The option 2 pond, though narrower, could
not be designed to eliminate wetland impacts due to the volume needed in the pond for rate control
and due to site topography.
The property to the north is zoned Rural Residential and is a steep, wooded hill on top of which are
cabins within Camp Tanadoona. To the east is additional land within Camp Tanadoona. To the
south is a single-family home on land zoned Single-Family Residential. To the west is Lake
Minnewashta.
Staff is recommending approval of the wetland alteration permit (option 2) subject to the conditions
of the staff report.
APPLICABLE REGUATIONS
Chapter 20, Article IV, Division 2, Conditional Use Permits
Chapter 20, Article VI, Wetland Protection
Sec. 20-404. No net loss.
To achieve no net loss of wetland, except as provided under section 20-416 of this article, or
authorized by a wetland alteration permit issued by the city, a person may not drain, grade, fill,
burn, 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.
Sec. 20-407. Wetland alteration.
(a) An applicant for a wetland alteration permit must demonstrate that the activity impacting a
wetland has complied with all of the following principles in descending order of priority:
(5) Replaces unavoidable impacts to the wetland by restoring or, if wetland restoration
opportunities are not reasonably available, creating substitute wetland areas having equal
or greater public value as set forth in Minnesota Rules 8420.0530 to 8420.0760. Exceptions
Tanadoona Drive Wetland Alteration Permit
Planning Case 07-17
August 7, 2007
Page 3 of 7
to this part are calcareous fens, which are subject to Minnesota Rules 8420.1010 to
8420.1070.
Sec. 20-408. Permit required.
(a) No person shall drain, excavate in the permanent of semi-permanent flooded areas of type 3,
4, or 5 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 of healthy native vegetation, or otherwise altering or
destroying a wetland of any size or type 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.
Sec. 20-409. Filling.
When a wetland alteration permit is issued allowing filling in a wetland, filling must be
consistent with the Chanhassen Surface Water Management Plan and the Minnesota Wetland
Conservation Act. The filling shall not alter the hydrological patterns in the remainder of the
wetland if a portion of the wetland remains unless exempted under section 20-416.
Sec. 20-412. Mitigation.
(a) Mitigation intent. Where wetland alteration is approved and mitigation is required pursuant
to City Code and Minnesota Rules 8420.0540, 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 Minnesota Rules
8420.0546 to achieve replacement of the wetland function and value.
BACKGROUND
Dogwood Road is currently a rural section roadway with no curb and gutter. With the proposed
improvements, Dogwood Road will be widened to a 26-foot or 31-foot wide urban section with
barrier curb and gutter on both sides. The addition of barrier curb and gutter with storm sewer
on Dogwood Road will create point discharges of runoff from the storm sewer at the north and
south ends.
The base bid of the project included a bid item for an environmental manhole to be installed at
the southeast intersection of Tanadoona Drive and Dogwood Road. A bid alternate was included
for the construction of a stormwater pond on the northwest corner of Tanadoona Drive and
Dogwood Road. The bid alternate requires excavation and fill within a wetland with a backhoe.
The existing culvert under the Tanadoona/Dogwood intersection will be replaced with this
project. If the stormwater pond is constructed, a pond inlet structure will be installed on the
southeast corner of the pond and a pond outlet structure will be installed on the northwest corner
of the pond.
Tanadoona Drive Wetland Alteration Permit
Planning Case 07-17
August 7, 2007
Page 4 of 7
WETLANDS
Existing Wetlands
One wetland exists on site as delineated by Short, Elliot, Hendrickson on April 16, 2007. The
wetland is a 0.19-acre, Type 1 wetland located west of the intersection of Tanadoona Drive and
Dogwood Road. The dominant wetland vegetation is small box elder trees and reed canary
grass.
Wetland Mitigation
Mitigation of the proposed wetland impact will be provided by withdrawal of 0.05 acres of
public value credit and 0.05 acres of new wetland credit from the City of Chanhassen Wetland
Bank.
ANALYSIS
The intersection of Tanadoona Drive and Dogwood Road is the low point for the western 1,500 feet
of Tanadoona Drive and the northern 900 feet of Dogwood Road. The wetland lies within a
drainageway that carries surface runoff from the existing roads and drainage from a culvert that
connects to the wetland complex to west.
For the north portion of Dogwood Road, some type of stormwater management is needed to 1)
reduce the erosive forces of the stormwater discharging from the Dogwood Road storm sewer;
and 2) provide pretreatment and solids/nutrient removal from stormwater before it is discharged
into Lake Minnewashta. The addition of barrier curb prevents runoff from sheet flowing into the
ditch, and increases the time of concentration which increases flows. In addition, as the
proposed improvements will widen Dogwood Road, impervious area within the project boundary
is increased, which indicates that some type of rate control should be exercised.
Three alternatives were examined to address stormwater runoff with the project:
1. No-Build/Environmental Manhole Alternative.
The base bid for the project is an
environmental manhole. To minimize cost and maintenance requirements for the City, the
proposed environmental manhole would only function as a sediment removal device for
particles as small as 125 microns in diameter. The negative to the selected environmental
manhole is that it would not have the capability of removing smaller particles or nutrients
from the runoff, and would not provide any type of rate control.
2. Stormwater Pond – Option 1.
To better manage flows from the new storm sewer
system, a stormwater pond was proposed as a bid alternate. The original design explored the
possibility of minimizing the pond surface area by designing a rounded pond. While this
pond shape would require a smaller permanent easement from the camp property owner, the
impacts to the existing wetland were maximized by the pond grading because of the wetland
location. Permanent impacts to the wetland with the Option 1 pond configuration are
approximately 6,000 square feet.
Tanadoona Drive Wetland Alteration Permit
Planning Case 07-17
August 7, 2007
Page 5 of 7
OPTION 1
3. Stormwater Pond – Option 2.
The Option 2 stormwater pond keeps the pond as narrow
as possible while still minimizing grading and impacts to the adjacent properties. A pond
design to fit entirely outside of the existing wetland boundaries was explored; however, there
was no feasible way to grade a pond 1) with the volume needed for rate control; and 2) that
would fit within the existing topography (we are constrained by hills to the north and east, a
private property to the south and Lake Minnewashta to the west). The elongated option was
the best design to meet the pond rate control requirements and to match the existing
topography. With Option 2, the permanent impacts to the existing wetland are
approximately 2,100 square feet.
OPTION 2
Tanadoona Drive Wetland Alteration Permit
Planning Case 07-17
August 7, 2007
Page 6 of7
TREE REMOVAL
This heavily wooded site is covered by a sugar maple-basswood forest on the upland area. It is a
regenerating forest with a variety of age classes. Existing tree cover has served to protect Lake
Minnewashta by filtering runoff from Tanadoona Drive and reducing erosion along the
lakeshore. Tree removal for the proposed stormwater pond will reduce these benefits. Staff
recommends that tree plantings consistent with the existing species be located around the pond.
Also, tree protection fencing must be installed at the edge of the grading limits prior to any
construction activities.
RECOMMENDA TION
Staff and the Planning Commission recommends that City Council HH~ PhumiRg C0mmissi8R
adopt the following motion and adoption of the attached findings of fact and recommendation:
"The PhmRiRg C8mmissi€JR re@0mmeR€ls tfie City Council approves Wetland Alteration Permit
07-17 to permit 2,100 square feet of wetland alteration subject to the following conditions:
1. Erosion control blanket shall be installed on all slopes greater than or equal to 3: 1. All
exposed soil areas shall have temporary erosion protection or permanent cover year round,
according to the following table of slopes and time frames:
Type of Slope
Steeper than 3:1
10:1 to 3:1
Flatter than 10: 1
Time
7 days
14 days
21 days
(Maximum time an area can
remain open when the area
is not actively being worked.)
These areas include constructed stormwater management pond side slopes, and any exposed
soil areas with a positive slope to a stormwater conveyance system, such as a curb and gutter
system, storm sewer inlet, temporary or permanent drainage ditch or other natural or man
made systems that discharge to a surface water.
2. A minimum of six trees will be planted on site. Native species shall be used.
3. Tree protection fencing shall be installed at the edge of grading limits prior to any
construction activity.
4. Tree removal limits shall be inspected by the Environmental Resources Specialist prior to
any removals."
Tanadoona Drive Wetland Alteration Permit
Planning Case 07-17
August 7, 2007
Page 7 of 7
ATTACHMENTS
1.Findings of Fact and Recommendation.
2.Project Description.
3.Project Alternatives.
4.Wetland Delineation Report Dated April 20, 2007.
5.Public Hearing Notice and Mailing List.
g:\plan\2007 planning cases\07-17 tanadoona drive wap\staff report.doc
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
FINDINGS OF FACT
AND RECOMMENDATION
INRE:
Application of the City ofChanhassen for a Wetland Alteration Permit - Tanadoona Drive Storm
Water Pond.
On August 7,2007, the Chanhassen Planning Commission met at its regularly scheduled
meeting to consider the application of the City of Chanhassen for a Wetland Alteration Permit for
2,100 square feet of wetland alteration on the property located at 3300 Tanadoona Drive. The
Planning Commission conducted a public hearing on the proposed conditional use was preceded
by published and mailed notice. The Planning Commission heard testimony from all interested
persons wishing to speak and now makes the following:
FINDINGS OF FACT
1. The property is currently zoned Rural Residential District, RR.
2. The property is guided by the Land Use Plan for Public/Semi-Public uses.
3. The legal description of the property is: Part of Government Lot 9, Carver County,
Minnesota
4. Criteria for Approval:
a. The proposed project will not be detrimental to the public health, safety, comfort,
convenience or general welfare of the neighborhood or the city.
b. The proposed project will be consistent with the objectives of the city's comprehensive
plan and Chapter 20, Zoning, of the Chanhassen City Code.
c. The proposed project will be designed, constructed, operated and maintained so to be
compatible in appearance with the existing or intended character of the general vicinity
and will not change the essential character of that area.
d. The proposed project will not be hazardous or disturbing to existing or planned
neighboring uses.
e. The proposed project will be served adequately by essential public facilities and services,
including streets, police and fire protection, drainage structures, refuse disposal, water and
sewer systems and schools; or will be served adequately by such facilities and services
provided by the persons or agencies responsible for the establishment of the proposed use.
r The proposed project will not create excessive requirements for public facilities and
services and will not be detrimental to the economic welfare of the community.
1
g. The proposed project will not involve uses, activities, processes, materials, equipment and
conditions of operation that will be detrimental to any persons, property or the general
welfare because of excessive production of traffic, noise, smoke, fumes, glare, odors,
rodents, or trash.
h. The proposed project will have vehicular approaches to the property which do not create
traffic congestion or interfere with traffic or surrounding public thoroughfares.
1. The proposed project will not result in the destruction, loss or damage of solar access,
natural, scenic or historic features of major significance.
J. The proposed project will be aesthetically compatible with the area.
k. The proposed project will not depreciate surrounding property values.
1. The proposed project will meet standards prescribed for certain uses as provided in the
wetland protection standards.
5. The planning report #07-17 dated August 7,2007, prepared by Alyson Fauske, et ai, is
incorporated herein.
RECOMMENDA TION
The Planning Commission recommends that the City Council approve the wetland
alteration permit.
ADOPTED by the Chanhassen Planning Commission this 7th day of August, 2007.
CHANHASSEN PLANNING COMMISSION
BY:
Its Chairman
2
PART 5: PROJECT DESCRIPTION
DOGWOOD ROAD IMPROVEMENTS
CITY PROJECT 06-06
WETLAND AL TERA TION PERMIT
Dogwood Road is currently a rural section roadway with no curb and gutter. With the
proposed improvements, Dogwood Road will be widened to a 26- foot or 31- foot wide
urban section with barrier curb and gutter on both sides. The addition of barrier curb and
gutter with storm sewer on Dogwood Road will create point discharges of runoff from the
storm sewer at the north and south ends.
The base bid ofthe project included a bid item for an environmental manhole to be
installed at the southeast intersection of Tanadoona Drive and Dogwood Road. A bid
alternate was included for the construction of a storm water pond on the northwest comer
of Tanadoona Drive and Dogwood Road. The bid alternate requires excavation and fill
within a wetland with a backhoe.
The existing culvert under the Tanadoona/Dogwood intersection will be replaced with
this project. If the storm water pond is constructed, a pond inlet structure will be installed
on the southeast comer of the pond and a pond outlet structure will be installed on the
northwest comer of the pond.
The proposed storm water pond to be constructed is shown in the "Option 2" exhibit
attached to this application.
PART 6: PROJECT ALTERNATIVES
DOGWOOD ROAD IMPROVEMENTS
CITY PROJECT 06-06
WETLAND ALTERATION PERMIT
No-BuildlEnvironmental Manhole Alternative
F or the north portion of Dogwood Road, some type of storm water management is
needed to 1) reduce the erosive forces of the stormwater discharging from the Dogwood
Road storm sewer and 2) provide pretreatment and solids/nutrient removal from storm
water before it is discharged into Lake Minnewashta. The addition of barrier curb
prevents runoff from sheet flowing into the ditch, and increases the time of concentration
which increases flows. In addition, as the proposed improvements will widen Dogwood
Road, impervious area within the project boundary is increased, which indicates that
some type of rate control should be exercised.
The base bid for the project is an environmental manhole. To minimize cost and
maintenance requirements for the City, the proposed environmental manhole would only
function as a sediment removal device for particles as small as 125 microns in diameter.
The negative to the selected environmental manhole is that it would not have the
capability of removing smaller particles or nutrients from the runoff, and would not
provide any type of rate control.
Stormwater Pond
To better manage flows from the new storm sewer system, a stormwater pond was
proposed as a bid alternate. We originally explored the possibility of minimizing the
pond surface area by designing a rounded pond (Option 1). While this pond shape would
require a smaller permanent easement from the camp property owner, the impacts to the
existing wetland were maximized by the pond grading because of the wetland location.
Permanent impacts to the wetland with the Option 1 pond configuration are
approximately 6,000 square feet.
The Option 2 stormwater pond option keeps the pond as narrow as possible while still
minimizing grading and impacts to the adjacent properties. While we explored the
possibility of designing a pond to fit entirely outside of the existing wetland boundaries,
there was no feasible way to grade a pond 1) with the volume needed for rate control,
and 2) that would fit within the existing topography (we are constrained by hills to the
north and east, a private property to the south and Lake Minnewashta to the west). The
elongated option was the best design to meet the pond rate control requirements and to
match the existing topography. With Option 2, the permanent impacts to the existing
wetland are approximately 2,100 square feet.
I
I
I
I
I
I
I'
I
I'
I
'I
I
I'
I
I
I
I
I
I
<% - O~
Jt..
SEH
WETLAND DELINEATION REPORT
DOGWOOD ROAD POND
TO:
Ms. Lori Haak, City of Chanhassen
FROM:
Deric Deuschle
DATE:
April 20, 2007
RE:
Wetland Delineation Report
SEH No. A-CHANH0702.00 30.90
Introduction
The purpose of this study was to investigate the project area, identify areas meeting the technical
criteria for wetlands, delineate the jurisdictional extent of the wetland basins, and classify the
wetland habitat. This wetland delineation is being completed to assess the suitability of the
property for the placement of a storm water pond. This pond is required as part of the Dogwood
Road reconstruction, but its placement and design may be affected if wetlands are present.
Site Description
The project area is located in the northwest corner of the intersection of Tanadoona Drive and
Dogwood Road as shown in Figure 1. This is just southwest of the Girl Scout camp and Lake
Minneswashta Regional Park and along the southwest shore of Lake Minnewashta. The size of
the area investigated is approximately 1.5 acres, and is located within the City of Chanhassen in
Carver County. The project area is within the SW ~ of the NE 1,4 of Section 8, township 116N,
Range 23W.
Land use in the area is a mixture of some residential lots along the west side of Dogwood Road,
but most of the surrounding area is wooded with mature hardwoods and relatively steep
topography. The property reviewed is also wooded, but with slightly younger trees than the
surrounding hills. The property is slightly sloped toward Lake Minnewashta, and a small
channel flows in that direction. The channel is fed from a larger wetland on the east side of
Dogwood Road. Under most circumstances the channel is dry. The exception to this condition
is in spring during snow melt and after large rain events. This drainage, and ones similar to it,
are common in the City, and are almost always conveyance systems that lack the hydrology to be
jurisdictional wetland. There are two areas that are a little flatter that the rest of the area. In
these flatter areas, wetlands have been identified.
Wetland Delineation
Wetlands Definition
Wetlands are defined jointly by the U.S. Army Corps of Engineers [US ACE (Federal Register,
1982)] and the U.S. Environmental Protection Agency [EPA (Federal Register, 1980)] as
follows: "Those areas that are inundated or saturated by surface or ground water at a frequency
Shorl Elliott Hendrickson Inc., 3535 Vadnais Center Drive, SI. Paul, MN 55110-5196
SEH is an equal opportunity employer I www.sehinc.com I 651.490.2000 I 800,325.2055 I 651.490.2150 fax
I
.1
I
,I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Dogwood Road Pond Wetland Delineation
April 20, 2007
Page 2
and duration sufficient to support, and that under normal circumstances do support, a prevalence
of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include
swamps, marshes, bogs, and similar areas."
According to US ACE, one positive indicator (except in certain situations) from each of three
elements must be in order to make a positive wetland determination, which are as follows:
· Greater than 50 percent dominance of hydrophytic plant species;
. Presence of hydric soil; and
. The area is either permanently or periodically inundated, or soil is saturated to the surface
during the growing season of the dominant vegetation.
Methodology
Wetlands Survey
The National Wetland Inventory (NWI), USGS Topographic Maps, Minnesota Department of
Natural Resources Public Waters Inventory Map (PWI), Carver County Soil Survey, recent aerial
photographs, the City Wetland Inventory, and Minnehaha Creek Wetland Inventory were
reviewed to gather available data on potential wetlands in the project area. Of these sources, the
only one that suggests wetland may be present is the soils survey, which includes a portion of the
property as a hydric soil.
Field Procedures
The project site was examined on April 18, 2007 for areas meeting wetland criteria in accordance
with the Corps of Engineers Wetlands Delineation Manual (USACE, 1987). The Routine Onsite
Determination Method (RODM) was applied for this delineation.
Wetland plant species nomenclature follows the "National List of Plant Species that Occur in
Wetlands" (U.S. Department of the Interior, 1988). Identification was aided when necessary
with field guides for the region. All dominant vegetation present was identifiable.
Soils were observed for hydric soil characteristics. Soils were examined by digging pits at
representative locations and periodically along the wetland boundary. Pits were dug to a depth
necessary to confirm hydric soil characteristics, up to a maximum depth of 24 inches. Soil color
determinations were made using MUNSELL Soil Color Charts (Kollmorgen Instruments
Corporation, 1990).
Subsurface wetland hydrology indicators were examined using the soil pits as deep as 24 inches
to confirm soil saturation. Surface hydrology was also present and recorded as depth above
surface.
Wetland boundaries were located and marked with sequentially numbered, 3~-inch pink
"Wetland Delineation" pin flags. The wetland edge is considered the highest extent of the
I
I
'I
,I
I
I
I
I
I
I:
I
I
I
i
I
I
I
I
I
Dogwood Road Pond Wetland Delineation
April 20, 2007
Page 3
wetland basin; areas above the boundary fail to meet the three required wetland parameters while
areas below the edge meet the wetland parameters required by the field delineation methodology.
The location of the delineated wetland boundaries were mapped using a Geo XT Global
Positioning System, and provided to the City in cadd and shapefile formats vie e-mail.
Results
The field delineations were completed on Apri116, 2007. Although early in the growing season,
there was new growth of vegetation and no frozen soil layers. Temperatures were above normal,
and precipitation was slightly below normal. Sufficient data was present to determine thwe
wetland boundary.
Two wetland areas divided by a small drainageway were identified on the property. Although
separated by approximately 100 feet, these basins are similar enough to be described as one
basin. The total area of wetland delineated is 0.19 acres.
Vegetation in the wetland area is dominated by small box elder (Acer negundo) trees, a few elm
(Ulmus americana), and a few shrubs including red osier dogwood (Comus stolonifera), and
buckthorn (Rhamnus cathartica). The herb layer is dominated by reed canary grass (Phalaris
arundinacea) in the eastern lobe and a large patch of woodland sedge (Carex pennsylvanica) in
the south side. There are also some additional sedge species present, but could not be identified
due to lack of fruit and topping by rabbits. One of the more common herbaceous species in the
wetland was one of the avens (Geum sp.). More than just the basal leaves would be needed to
make a positive identification to species. All of the avens are positive wetland indicators, so
specific species are not particularly important in this instance, however.
Upland vegetation is dominated by a mature hardwood forest composed of sugar maple (Acer
saccharum) and a few bur oak (Quercus macrocarpa) trees. Basswood (Tilia americana) trees
are also present. The herb layer in the upland is relatively sparse, but given the closed canopy is
not surprising. On the hillslopes patches of trout lily (Erythronium spp.), Dutchman's breeches
(Dicentra cucullaria), and bloodroot are appearing (Sanguinaria canadensis). Closer to the
wetland edge, garlic mustard (Allaria petiolata) is common. At this early stage of development,
the garlic mustard and avens are very similar in appearance, but garlic mustard has a distinct
odor when crushed and can easily be identified. The upland area west of the basin is also
wooded, but has a herbaceous layer that is a very dense stand of horsetail (Equisetum hymale).
Horsetail is a positive wetland indicator, but is more indicative of shade than standing water. In
this instance, the horsetail is also on a very sandy berm and is several feet in elevation above the
wetland, so it is not a good indicator. No horsetail was observed within the wetland boundary.
Soils in the wetland were composed of 6-8 inches of saturated clay loam atop at least another 18
inches of clay. The soil colors were dark brown (2.5Y 2.511) at the surface, and black (gley
2.5/N) below the top layer. Soils were saturated to the surface, and free water was observed at
three inches from the surface. Soil pits were dug as far away from the channel as possible to
avoid false hydrology and soils data. Soil pits dug closer to the channel did tend to be wetter,
and had layers of sand that had eroded in, but were otherwise similar black clay and clay loam
I
I
'I
,I
I
I
Ii
I
'f
I
1\
I,
I
I
"
I
I
I
I
Dogwood Road Pond Wetland Delineation
April 20, 2007
Page 4
soils. This area is mapped as Hamel loam, which is a listed hydric soil. The soils observed on
site are close to Hamel, and would- likely' qualify as meeting the soil survey description.
Hydrology in the wetland was observed as saturation within 12 inches throughout the wetland
and inundation in the channel. Many of the box elder trees in the basin also had some signs of
buttressing, shallow roots, and possible water marks.
Upland soils were similar in composition, but were higher in chroma. A typical upland sample
near the wetland and base of the hills was composed of six inches of dark brown (1 OYR 2/2)
loam atop at least another 18 inches of dark brown (lOYR 2/2) clay. Proceeding up the hill, the
soils get even lighter. The west side of the basin lies adjacent to a berm that divides the basin
from the lake. This berm is sandy, but it is unknown if it is natural. It appears to be a very large
ice ridge, but is inconsistent with the rest of the lakeshore. If it is manmade, it is very old given
the age of the trees growing on it. Although the soils were damp, no saturation, inundation, or
secondary indicators were observed in the upland area.
Wetland Classification
Wetland classification follows the methods described in Wetlands and Deepwater Habitats of the
United States (Cowardin, et aI., 1979) and the United States Fish and Wildlife Services National
Wetland Inventory. The Circular 39 classification (Shaw and Fredine, 1956) is also provided, as
that classification system is used in Minnesota, in part, to make distinctions of potential wetland
permitting and mitigation requirements.
Hydrology in the wetland is provided by surface flow, and is usually only during snow melt and
rain events. It does not appear that a high groundwater table contributes to wetland hydrology.
Because of this intermittent source and short duration, I am classifying this wetland as a Type 1
basin. This is a seasonally flooded flow-through wetland. Although portions are wooded, more
than half of the wetland area is lacking trees. The canopy of the trees around the wetland
certainly influences the vegetative composition, however. Using the Cowardin classification,
this basin would be a PEMAd.
Regulatory Considerations
Wetlands in the project area are regulated by several agencies at the local, regional, state, and
federal levels including the U. S. Army Corps of Engineers and the Environmental Protection
Agency at the federal level and the City of Chanhassen and Minnehaha Creek Watershed District
County at the local level. Additional review by the Board of Water and Soil Resources, Carver
County SWCD, and the Minnesota Department of Natural Resources is also recommended.
As the Local Government Unit administering the Wetland Conservation Act, the City of
Chanhassen has the ability to review and approve the wetland delineation. It is suggested that
outside agencies are invited to participate in this review or are provided with a Notice of
Decision that they may respond to if they choose.
The preliminary plans for this project indicate placement of a pond on this property. Preliminary
design appears to impact approximately 1,500 square feet of wetland through both excavation
I
I,
I'
I
1
I
I'
I
t
t
1\
I
I
If
I
,I
I
I
I
Dogwood Road Pond Wetland Delineation
April 20, 2007
Page 5 _
and filling for the creation of berms. As this project is located in the shoreland wetland
protection zone, this is above the de minimis. Consequently, mitigation may be required if the
pond design isn't changed to reduce impacts. Total impacts of less than 400 square feet would
be required to avoid compensatory mitigation. Consultation with the pond designers may
identify alternative designs that would achieve this goal. Consultation with the u.s. Army Corps
. of Engineers is also suggested.
Please contact me at 651-490-2114 or at ddeuschle@sehinc.com if I can provide more
information or be of further assistance.
s:\ac\c"=hanh~mroon'dogwood files\dogwood wet delin repon.doc
~
SEH
Wetland Delineation Results
on 2006 Aerial Photograph
Wetland Delineation
A-CHANH0702.00
Figure 4
CITY OF CHANHASSEN
AFFIDAVIT OF MAILING NOTICE
STATE OF MINNESOTA)
) ss.
COUNTY OF CARVER )
I, Karen J. Engelhardt, being first duly sworn, on oath deposes that she is and was on July
26,2007, the duly qualified and acting Deputy Clerk of the City of Chanhassen, Minnesota; that
on said date she caused to be mailed a copy of the attached notice of Public Hearing for
Tanadoona Drive Wetland Alteration Permit - Planning Case 07-17 to the persons named on
attached Exhibit "A", by enclosing a copy of said notice in an envelope addressed to such owner,
and depositing the envelopes addressed to all such owners in the United States mail with postage
fully prepaid thereon; that the names and addresses of such owners were those appearing as such
by the records of the County Treasurer, Carver County, Minnesota, and by other appropriate
records.
Subscribed and sworn to before me
this ;2.<.a-hday of~Ll L , 2007.
~ f
l
KIM T. MEUWISSEN ,
N~ Public-Minnesota
~y, ~r'nlssion Expire$ Jan 31. 2010
0)
c
.-
...
a>
a>
2
0)5
c .-
.- 0
J.. 0
CO._
a> E
J:
(,) E
.- 0
:cO
:JO)
a..C
~ .-
o ~
a> CO
(,)-
;0..
o C
Za>
o
o
CO
.c
c
CO
.c
o
0)
C
.-
...
a>
a>
2
c
0)0
c.-
._ 0
J.. 0
CO.-
~E
(,) E
._ 0
-0
.c
:JO)
a..C
.-
~C
o c
a> CO
(,)-
.- a..
...
o c
Zm
o
CO
J:
C
CO
.c
o
t
tll
U;
(5
c
>-
tll
EtU t5
g-g 2
.~ g~ ~
~Eas 8 .~
:.c-(j)o 0
f-O~_ c
'~Co-E 11I
~o~~ ;S
0..Q)00) -
0:500... 0
Ocl'-- C -8
r:..: 0 I'--.Q 'w
_gUJea ell
ro:O~Q; l!!
I'-- c 0) - ell
o~.oE<( 0)6;
OQ) -0 >....
C\J"D ro C .- ell
-..:.!::_ c~.c
I'--~O~ 0)0.....
- .- 0) UJ ro c
UJ a3 '(3 > UJ C 0
::l>c> roo.!!!
O>Q)::lro .!::Oo..
::lQ)0 C-oell
<(:500-0 ro roE
-c -.-c.!::cc
~.;: -;;; en Q 0 ctl 0
-0 Q) '" 0) u.-.- f-.-
UJ1ilI::l~oo(;j
O);:';;cg"*Cog
~30cr.::S:Og<
E
~
o
U:i
ro
Q)
E .. - ..
j:: s:: (ij s:: >s::
~ 0 III C'Clt:0
:;:: 0 .2 Q):;::
Q) C'Cl a. 8: a. C'Cl
- (.) 0 o (.)
C'Cl 0 ... ... 0
C ....I Il. <C1l.....I
t
-ffi E
15 0
c U:i
~ ro
E tU -
.~ i -d ~
gs tll > c
~~as8
:C=<i5o
f-o~_
. ~ Co E
~ 0 ~ ~
0..Q)00)
0:500...
o c I'-- c
r:..: 0 I'--.Q
_gUJea
ro:O~Q;
I'--cO)_
o~.o<(
oQ)E-o
C\J"D ro c
- ..:.!:: ro c
I'-- ~'O +::: 0)
- .- 0) UJ
UJ a3 .- > UJ
::l>u> ro
O>Q)Sro .!::
::l Q) 0 c
<(:50 0-0 ~
- c ..... c.....
iU';: ro U:i Q 0
-oQ)IO)U.-.-
UJ 1il ::l ~ 0
0)=>:0'$>:
+:=+-'Q)CO+-'
~3C3cr.:so
Q)
E
j::
~
Q)
-
C'Cl
C
s::
o
:;::
C'Cl
(.)
o
....I
C'Cl
III
o
a.
o
...
Il.
- ..
s:: >s::
C'Clt:o
.2 Q):;::
o.C'Cl
2-0(.)
~...o
<C1l.....I
O)-g~ UJ
.!::o- 0)
-.!::-o UJ
-~ro UJ
::l 0 0) ::l
..8 ~ = t5 .g_
ro 0>= 0)
::l 'Q) S '0 _ -0
o c .: Ci. ~ 6
> 0) ro -0 '0 '00
E .!::.!:: 0) ~
~ - 0 UJ a. .~
o EO).. 0 0) .2 E
1:: o.!:: UJ a..!:: .0 E
.- ~ - a. 0 - ::l
0"'" -O)~co..o
-'5 g'U:i 0..0 0)0
.~ a.:;:::; 0> 0) UJ.!:: 0)
"",cO)c.!::_c-.!::
....n.- 0) -
.~ c E .~ 0 .s:Q E -0
~ 'co 0 a. 0 c
g5:EO)~:S:c';::ro
.!:: 0:S -.- .~ 0) -0 -0
uoo>O)2:UJ~o)
= _ c .!:: 0) ~.- UJ
.0 -0 'C - > a. 0) .Q
::lC::l.!::o=~u
a. ro 0 g> c .~ ~ .~
~ ~ t5 E ~ c ~ .~
..... ::l 0) - .::: ro ~ ~
o 0"0' 0> 0>.2 2 ro u
O)O)~c-o..cO)O)
UJ ~ o..'c '5 a. 0) .!:: '5
o_UJUJro>roEu=
2-c:c 0):::: E:5 l....L
::lctl-.!::ctl~O::lO)
o..g'5gCi5f-oo...:S
0) 0.. 0 .0
.= g- fJ 6.,...- C\i c<) ..t
IIIC)
s:: s::
Q).-
0.-
o.Q)
C'Cl Q)
~:E
-Q)
C'ClJ:
J:-
3:1;;
.8 c ~
_ .!:: .0 >
UJ UJ C C'ClC'Cl
'S; .~ c > 0) 0) ~ -g
0) ::l~~~.s.!::>5
UJ 0>0_~-C'ClJ:
ro ><(UJ:crooQ)1-
0) :=_::lso..-.o
0.. -'u. O)~_Q)
0> E ~ E E ~ '6. ~:S ~
c :Co '.o.!::O Q)~,
:;:::; UC::l-UE>S::
'gs ~O)~UJoO)Q).8~
E ..! ~ ~.8;,~.'!:: C'Cl Q)
I - ...U '" 0.. > III E
0) 00).!::0)00'-'O
:S c:o..~ ~ u Ci.:S.& s::
0) ro .!::OO)_...IIIO
~ -::::.... .!:: C .- 0 .- .-
o .. ~ ~ .~ u 0 S - -; ~
Q5 ea Q; '0' u ::l 0) :::: t: =: 'E-
.oO)UJCi.@)O>~OIll
UJ --- 0) >- ro (f) 0..0 E
C O>UJ UJ~......!:: Q)
roro~:.cUJ--:o ....~o
0.. a. C - ::l "<t - 0>:::: .,. 0
0) ~ E '5 .E CD "3 .~ C'Cl t) g-
.!:: S C 0 ro;::::Ci(j)t) Q).=
- 0) .0 ea . <D 0) Q) '0' s::
gs2UJro_I'--.!::EJ:"'S::
UJ ~ ~ ~'co ~ UJ 0) I- o...!2
o '~.!:: 0 E . :::.!:: . Q) Il.
-ecO)O)~ -cJ:Q)
-o..roE --'-0-
C .!:: >- 0> UJ 0 .- s::J:
ro _UJ u 0.0 - C 0) ~ 0 -
S 2:;"(3 en 0) ctl 0) u '-E Q) oS
::l 0'- . 0 ~ 0) E C s::'"
o S - UJ C E ro E.- 0
>-0) S~ ~~ 0-6 oe';:
:=:S S ~LL o..u ctlO 0 C.
~..
III~
s:: s::
o Q)
:;:: E
~ E
;j 0
00
.8 ~
O)-g~ _.!:: Coo>
:S~~ ~ UJ UJc~ C ~~
- ~ ro UJ'S;'~ --- 0) 0) C'Cl III
g..8~ ~ ~ ~ g~~~.s:S~5
fJ -5,:= u g ro >- <( OUJ =E Co 0 Q) J:I-
::l 'Q) S 0) i5 0) ..... ::l S a. - .0
oc~ ~t5 C 0.. =t5 ~~-!
>- 0) ro o...~ 0 0> E ~ EC :'-'E- '6.:;;-
E.!::.!::o -oe '00 C _C '.o~o"'Q)~
~ - ~ 0.. "~ :m .!:: 8 C ::l - u E > s::
OEO)UJOO)._2E 0) I'-- O)UJOO)Q)O:;::
-'-cO.!:: ,...-O)UJ --o-.oQ)
.- ~ - a. a..!:: .0 EE' UJ UJ 0 >-.- .- C'Cl Q)
0"'" -O)o-~o I'--ctlro-o..>1II E
-'5O>U:iCi.c~o 0) 00).!::0)00-'O
.~ o...~ 0 0) :S C: 0.. ~ ~ u Ci.:S .& s::
C(j)O>O) UJ.!:: 0) 0) ro -.!::o 0)-... 11I0
0>.- O)'~ :S C - :S 0 :e: t5 u.!:: Co 1: .E :: 'iij
.~ C E S -.- .s:Q E -0 -.-'. > 0).....: U Q) III
Co 'co 0 0 0.. 0 C 0) ea Q; '0' 2. ::l 0) :::: t: =: 'E-
O):E~~sc';::ctl .0 UJ~~O>roOIll
.!:: 0 _ -.- .~ 0) -0 -0 UJ ~ --... 0.. 0) >- ro Ci5 0..0 E
uOO>O)>UJO)O) croUJUJ~-.-.!:: Q)Q)o
= - C .!:: O)~ 0).::: UJ ro 0.. ~ :.c UJ --: 0 ....::.
.0-0'-- ~O)O 0.. c-::l"<t-O>::::"'U
::lc~.!::~o..u~ O)~E'5.ECD:J~C'Clt)~
~roo~c=~m ~~~om~aQ)~~.E
~U:i~ero'_~~~ ;UJO)fJea~<DO)Q)~S::
-O)u.!::O)c-c O)_UJ -C\J.!::EJ:"'S::
-.-::l0)->_~~ UJuO)~O)c~C\JUJO)l-o...!2
o 0-'0' 0>'(5).~ ~ co t5 0 -~..c 0 E I ~..c . CD D.
O)~~~=-cO)O)-ecO)O)~--c:SQ)
~ UJ 0.. Co 'S: l5: 0) .!:: '5 c a. ~ E >- 0> en 0 .Q J:
o..~~O)>roEg=roUJuo.o-cO)UJg-
~~:S.!::::::O)E~U.s~~UJO)roO)u~ 0
u_uE.!::O::lO) ~~o~O)EcEQ)-
o..=::l=Wf-oo...:sgos-UJc ctlE~~
0)0..0.0 >-0)::.~30E>0-s::-
.!:: 0...0 ::l > - ...u.!:: 0 -0 ...
f-roroo..,...-C\ic<)..t :=:SSELLo..uroOOQ
ai
.!:!
-0
c
11I
:c
.....
'0
ell
:S!
11I
ell
UI
....
ell
>
~~
'C~
0.....
roC
CO
o.!!!
00..
-0 ell
roE
Cc
roo
f-:;:::
o ell
OU
C').2
C')<l:
IIIC)
s:: s::
Q).-
0.-
o.Q)
C'Cl Q)
~:E
-Q)
C'ClJ:
J:-
3:1;;
~..
III~
s:: s::
o Q)
:;:: E
~ E
;j 0
OU
~ Q) a '0 .~ Q) ~
o = g~~ c~ w ~ u~
~ 0 .- Q) a. ~ :::: c ~.~ a. Q) ~ .E
mQ)"O rn'~ro (LoQ) co<(c .2:: c..cc
::::'~Q.) "OcQ)(J) +-' ().- Q)>:> Q).S!2o
<(m:s Q)~~ ~~ 8:Q)~ Q).~ ~~.~
~~g E~~ro~~ ro~~ ~~ ;~~
co: Q) E .0 0 Q) t -i:: . Q) a. "- Q) '- l... >. ~
~.o~ oIDa.~roo~~E+-' -0 ro_o
Q)a ~>eroa.'~E;o~ 5- (j)-C
~~g lo...ma.E~E~(J)uE .~ ~~~
oom2 mQ)Q)~ Q.)"O~gt ~m cc""
~~.~ ~.~5m~a.5~~~ '5~ ~~8
~oU m~SE..c.~~(J)-Q) (1)> .0-0
E = .~ c 3 0 $ 3: (/J'(3 ~ 5 0 .:; co 0 >. Q)
._n.o .Q>.D'->.mlo...uEa ,-0 c~E
.m5.~ Cii:m~~~Q)Eo-,~ .2~ cnO~
Em~ ~~m;~~E~ffi~ ~.~ ~~c
~.~= ~cig~,,-m8E~~ E~ ~~~
m~o .-.SOOOCO~(J) 0_ '5-~
- g - . C Q) - .!!? E Q) - :;: Q) ~ () UJ c t: Q
~ l... Q) g> Q).Q).2 U .: E (ij "0 ~ .... CO:.....: ::J 0 ~
.Q~2:a3.5E:o-g:t::-gE~$:5 tUrn 8~~
~~8Q)ig~m~Q)~~~'i ~~ ~Q)OO
cE~E~~Q)aiE~()E~ efr GS2
8-g~~~.~:5'~~:~K>.~ a.~ Q)c'~
~Ej;~~~~~~EQ)~~ g.~ ~~~
~ <( >. ffi -g 0 U () >.~ g ~ a.~ -g :5 ~-g a..
-Q)t:=-UQ)=rocw-Eo aa -_Q)
5;"'O~mg01~.gEmcg?o.c ~c ~g:5
rr8oB=.Sa.a.~Q)Q)o~(J) ~~ ~'-n
~"O~"O~~~~~~~~'ffi~ .g~ ~2g
~c=S-~.o-o"Oc.Q-E~rnQ)Q) :Dsc
mm'5ca..=Q)ocm~oo~w~ ~~8
~ E .~ .S ~ ~ ';: .Q ~ ~ ~ ~ ~ a. * "m "8 a. C <D
Wm~"~.2-EoGoom=~mE~~ ~g~
wEg~~~<D=<D~w~~~-~~ -~m
C ~ ~ 1ij a. :t: ~ ~'c ~ (j) ~ ~ '0 "E .8 ~ ~ Q
m~~a.~~~c~2~.~.Q~~~~ .~~~
[E g -g l6 ~ t- .~;-;:;; CD ~ 6- Cii e 8 ~"~ en ~ cu 8
o <( (lj - :0 IT '.~ g ([ U Q) ~ :5 a. c: c 5 Q) m
~c.~~~~~E~ .c~~ ~~wo'~~~
~~~~w~~Eog~~~~O~S~.~rn~
o~oE~n~oO~~~Q):t:Q)~~~E.S-
:t:~~,--~c:o~~.S~Ec:5~~~EE.S
c.-G~cnQ)Q)Gcc~om~o.~Q)omu
..=>~ ~o~E.c <l>22(f)~.EU)ID(j)ogQ)
~i~~ .~"~~t-~E~2 .g~~m~~~Q)~
~cm.Qoo.mo~oE_S~o"_oE<l>._ou
-g ffi a. ~ ~ ~ Q) ~ ~ - 8 g.(f) ~ ~ ~ g..8 ~ 2 C"S
g~E.~.~m~mgg~~2c~(l)~u~~~~
a.~~8Ecm~~a.~~cQ)UJ$~.~tig8i~go
0.- ~ ca u:= ~ U) ~ m 0.-
:: .~ ~o 5 ~ 8.t.~ a5.~ g $ ~.S!? -g 0 ~ E :5 m. g
~$C~~~~o~E~~g-~m~8~m~E
~.~~'E~0.Q)gQ)EEom~~w.~cn~8~
ocUOe==U)~~oE C>U)~Q)Q)"Q)~ E
~~~0.$!Q)<Doo~.5.~~~c~~<D~0
~(f)OC~~(f)t-~~~oo~~a.w<(caa.mcaw
C3.. ...
.t ~ c~~ .~~ w U) -oj
cu 0 '.Q Q) ~ ~:s c E"'~ ~<D @.9
CD Q) -0 ~ '2: ca 0.... m ~ <( .S 0 .c e .c c
~:5.~ cQ)Q)o>~ .cQ)~ ~.~ ~i ~'~~
~~$ > o.$ca Q)Q) w w
csg E~~m~~ ca~~ '0"5 ;~g
~ 1l1l ~ ~ ~~ r~~ ~ ~ ~ 2 ~ ~ ~g
S~E ~~~E~~~~8~ 0; ~~~
~"~~ ~Q)~"2~~-5~.9t i-~ Ce
U)..c:: en c "6,= m ~ a.~ :J ~ ~ '0 rn ~ ~ 5
=>ou ca_~E..c::"~~U)-Q) ~~ .0-0
E~,~ c~B2~(j)"0~5o -0 ~c.~-Q)E
.~~~ g_m'm~(lj~UE~ ~~
2o.w m~~..c::~Q)Eo-,- =ca wom
ECUQ) Ewm-o~E~~e uu) ~~~
~ ~ :5 S ~ 2i ~ E ..... 0 .f: ~ ~ ~ ::: "0 - 0
~.5~ .5.~~Bo~~~m~ gE -B~
-2"- 'c1D-"~E<D=~<1>Jg UCl) .gt~
~~~~Q)Q).Q~.~Emu~- ~ ~8.~
gm-~"~E~~~~~m~5 ~~ o~.....
:5 a5 8 Q) "li5 c a m ~ Q) ~ ~ ~"~ 0 ~ Q) Cl)
cE~En"~Q)omE'~uE~ "~~ 5S9c
O~C<D=~..c::.~~m<1>e 0 o.~
0a5~5~'~~~~~~a.~~ on <1>.5'2
~E.~~~E~~~8~2~~ ;.~ ~i~
.S2~€~.28ig~-g~.8~S gs,:5 "~~.c~
~uIDmg~ffi~E(ljcU)o~ ~~ cac_
~~~~ji!i~~I~~; .~1 ~~~
~c=~-~n-o"Oc.Y:5~~Q)ID ~~~
m(lj>ca..=Q)OcQ)~oo:;:;~1o.... -'~o".J
"~E"~.5 ~ 1?~.Q z-.~~ ~ g-; a.:E"m -g n e<l>
(f)Q)~'~.Y-EuGen<l>=~(l)E.~~ ~,Q~
ooEQ)~~~$~Q)~~ro~~:=Eo -~Q)
"E-o ~t a. .-~.c 2 ~ (/) c~ () C.n .{g~D
Q)~~~~~~g~2~.~.Qg~~~.~~~
KEg"O~~t-.~~m~~~e8~.ffi~~ro8
Q<((lj~EIT,.~g([-o~g:5>a.cEgIDm
Q)cc<1>~<DCE~ .'C a. .....Q)Q)o.-.c~
>ro~~(/)~.QEocroma.EG~~(/)~~<D
~~~~~n~oog~~:~<Dg~~"~.~S
:t:~~'--~cO~~.5~EcS~~-oEE.5
c'-6~cnmQ)Gcc~oca~n~Q)oro-o
.. => ~ ~ 0 ~ E..c:: Q) 2 2 (f) ~ .e (j) ID w 0 g> Q)
0)"0 ID ~ t.~ E"-- ~ E Q) ~ ..2 Ol~ Q) <D o~-g
~~i,QciR~8~~E~~E~.~oE~.5~u
-g c c.~:a ~ Q) ~~..... 8 g.U)~-;~ g..8~ 2 c.~
g~E'~"~ca~~gg!~2C~Q)-O~~~~~
a.~oo8Ee~~-g~~~cQ)(f)sm.~~g&~~go
0"- ~ u:= ..c:: ~ ..c:: co: 0.-
:: ,~ ~ 0 g ~ 8. ~ .~ ~ .~ g 1"9 :E .~ -g 0 ~:2 :5 ~' g
~.~c~~~~0~E,~~~-~co:~8~m~~
~.~'2'2~nQ)g.Q)EEOQ)~gw,~cU:J8~
oc~oc==w~..c::oE C>oo2Q)(l).~~ E
~~mn$~<D<l>()0~.5"~~m_e~e<D~o
~U)~~~CJ)~~S~OO~~a.w~mo.mmU)
u.. ...
L3keM~a
J5/lJ
Disclaimer
This map is neither a iegally recorded map nor a sUlVey and is not intended to be used as one. This
map is a compiiation ot records, information and data located in various city, county, state and federal
offices and other sources regarding the area shown, and is to be used for reference purposes only.
The City does not warrant that the Geographic Information System (GIS) Data used to prepare this
map are error free, and the City does not represent that the GIS Data can be used for navigational,
tracking or any other purpose requiring exacting measurement of distance or direction or precision in
the depiction of geographic features. If errors or discrepancies are found please contact 952-227-1107.
The preceding disclaimer is provided pursuant to Minnesota Statutes !j466.03, Subd. 21 (2000), and
the user of this map acknowledges that the City shall not be liable for any damages, and expressly
waives all claims, and agrees to defend, indemnify, and hold hanrrless the City from any and all claims
brought by User, its employees or agents, or third parties which arise out of the user's access or use of
data provided.
L3ke Mrre.vastta
Disclaimer
This map is neither a legally recorded map nor a sUlVey and is not intended to be used as one. This
map is a compilation of records, information and data located in various city, county, state and federal
offices and other sources regarding the area shown, and is to be used for reference purposes only.
The City does not warrant that the Geographic Information System (GIS) Data used to prepare this
map are error free, and the City does not represent that the GIS Data can be used for navigational,
tracking or any other purpose requiring exacting measurement of distance or direction or precision in
the depiction of geographic features. If errors or discrepancies are found please contact 952-227-1107.
The preceding disclaimer is provided pursuant to Minnesota Statutes !j466.03, Subd. 21 (2000), and
the user of this map acknowledges that the City shall not be liable for any damages, and expressly
waives all claims, and agrees to defend, indemnify, and hold harmless the City from any and all claims
brought by User, its employees or agents, or third parties which anse out of the user's access or use of
data provided.
ALAN H & KAREN L DIRKS
7431 DOGWOOD
EXCELSIOR, MN 55331 c8013
CHARLES & JENNIFER NEWELL
7550 DOGWOOD RD
EXCELSIOR, MN 55331-8053
GRETCHEN L F STARKS
3301 T ANADOONA DR
EXCELSIOR, MN 55331-8048
JOHN & JOYCE FOLEY
4804 DUN BERRY LN
MINNEAPOLIS, MN 55435-1537
MICHAEL DEAN ANDERSON &
7140 HAZELTINE BLVD
EXCELSIOR, MN 55331-8056
PETER T & DEANNA 0 BRANDT
7570 DOGWOOD RD
EXCELSIOR, MN 55331-8053
ROGER W OAS
7301 DOGWOOD
EXCELSIOR, MN 55331-8015
CARLSON CUSTOM HOMES INC
1440 BAVARIAN SHORES DR
CHASKA, MN 55318-1547
DANIEL D & AMY R GETSCH
1069 DORLAND RD
MAPLEWOOD, MN 55119-3576
HERITAGE DEVELOPMENT OF MN
INC
422 EAST CO RD D
ST PAUL, MN 55117-1218
JOHN H GETSCH
5404 GLENGARRY PKWY
EDINA, MN 55436-2006
MPLS COUNCIL OF CAMPFIRE
GIRLS
2610 UNIVERSITY AVE W
MINNEAPOLIS, MN 55114-2007
PETERSON REVOCABLE TRUST
3301 T ANADOONA DR
EXCELSIOR, MN 55331-8048
SCOTT A VERGIN
7311 DOGWOOD
EXCELSIOR, MN 55331-8015
CARVER COUNTY
600 4TH ST E
CHASKA, MN 55318-2102
DAVID R & JENNIFER L MELIN
7321 DOGWOOD
EXCELSIOR, MN 55331-8015
JANET M QUIST &
7331 DOGWOOD
EXCELSIOR, MN 55331-8015
MARJORIE GETSCH
7530 DOGWOOD RD
EXCELSIOR, MN 55331-8053
MPLS COUNCIL OF CAMPFIRE
GIRLS
640 GRANT ST E
MINNEAPOLIS, MN 55404-1431
RICHARD C LUNDELL
7341 DOGWOOD
EXCELSIOR, MN 55331-8015
WESTWOOD COMMUNITY CHURCH
3121 WESTWOOD DR
EXCELSIOR, MN 55331-8044
Public Hearing Notification t\rea (500+ feet)
Wetland t\lteration Permit
3300 Tanadoona Drive
Planning Case No. 07-17
City of Chanhassen
Lake Minnewashta
i
~v .
O~0 .
\ ~
Hw 5 Arboretum Boulevard
CHANHASSEN PLANNING COMMISSION
REGULAR MEETING
AUGUST 7, 2007
Acting Chair Papke called the meeting to order at 7:00 p.m..
MEMBERS PRESENT: Kurt Papke, Mark Undestad, Debbie Larson and Kathleen Thomas
MEMBERS ABSENT: Jerry McDonald, Dan Keefe and Kevin Dillon
STAFF PRESENT: Bob Generous, Senior Planner; Alyson Fauske, Assistant City Engineer;
and Joe Shamla, Project Engineer
PUBLIC HEARING:
REQUEST FOR A WETLAND AL TERA TION PERMIT TO CONSTRUCT A STORM
WATER POND ON PROPERTY LOCATED AT 3300 T ANADOONA DRIVE,
PLANNING CASE 07-17.
Public Present:
Name
Address
Gretchen Starks
3301 Tanadoona Drive
Alyson Fauske presented the staff report on this item.
Papke: Okay, we'll start with Commissioner Larson.
Larson: I want to know what an environmental manhole is.
Fauske: Certainly. An environmental manhole is a large storm sewer structure and what it does
it has, it essentially will swirl water in through the manhole and through that swirling action
some of the sediments will drop down.
Larson: So is it a covered thing or is it an open hole or?
Fauske: It's covered.
Larson: Okay.
Fauske: Completely covered underground.
Larson: So it's not something you would see driving down a road?
Fauske: You wouldn't even see it. It would just appear as a regular manhole cover. The whole
system is under ground. It's a large chamber.
Planning Commission Meeting - August 7, 2007
Larson: Okay. Thank you.
Fauske: You're welcome.
Thomas: I do have a question on option 1. What is the impact? You said the feet on the option
2 I believe the impact. What's the impact on option 1?
Fauske: Option 1 is 6,000 square feet of impact.
Thomas: Thank you. No other questions.
Undestad: No. No questions.
Papke: So just to make sure I understand the visibility from the lake here with Option 2 with, I
think you mentioned it was about 60 so, 60 feet or so of tree coverage.
Fauske: 640.
Papke: Are we expecting this to be completely invisible from the lake so boaters going by won't
even know this is there?
Fauske: That's correct.
Papke: Okay. You also mentioned that there was some differential in the tree impact there. Any
trees of substance in the area? Are these you know scrub trees? Elm or are these big oaks and
maples. Qualitatively, should we be concerned about tree loss or anything of that sort?
Fauske: Qualitatively a lot of them have sustained some damage because of the seasonal
inundation...in looking through the report, I don't know that, I think she said that was mostly
sugar maples, basswood forest in the upland area. And there's not a lot of upland area within the
area we'd be ponding.
Papke: Yeah. I'd expect there to be box elder, you know things that would survive degradation.
Fauske: Correct, and ones that could not sustain the inundation have died.
Papke: Alright. Alright. Any differential in visibility to the surrounding properties? The home
to the south is reasonably close to this. From their perspective, would there be any qualitative
difference in the two proposals?
Fauske: Yes there will. There'll be some tree clearing along through here and we'll be talking to
the property owners and it's staffs recommendation to provide up to 6 trees that are appropriate
for one, the slope and two, the amount of water in the area to give him some screening. We
wanted to leave it open so that the property owner could work with staff so that we're not saying
we will be putting in these types of trees. We wanted to work with him. See what his screening
2
Planning Commission Meeting - August 7, 2007
requirements are. Does he want something more in line with what was in previously or would he
like to see maybe screening with an evergreen so we're remaining flexible with that, to work with
the property owner. And then to the north where the camp is, we've been having a lot of
conversations with the camp. You know there was a lot of, is this an attraction for campers to
head over there and there's actually quite a substantial wooded area from their beachlot for them
to travel and find the storm water basin. We feel that it's really quite well hidden.
Papke: Any other questions of staff?
Larson: One more. Can you point out on the map where the drainage manhole is?
Fauske: Certainly. The drainage manhole that we've already shown, and I apologize it's not a
really clear drawing. This would be the roadway. Through here. The manhole option would be
approximately at this location.
Papke: Okay. At this point I'd like to open up the public hearing for public comments. If there's
any members of the community that would like to get up and speak or ask questions on these,
please do so. If you'd step to the podium please and give your name and address for the public
record.
Gretchen Starks: Everybody knows me. Gretchen Starks, 3301 Tanadoona Drive. I just had a
question on the property, on the new construction, it's my understanding that it would put curb
and gutter up, is it going to be from my driveway all the way around or is it just halfway down
now?
Fauske: There's two different kinds of curb. Of curb and gutter style they're looking at. On the
north side is what we call high back. It's where it meets the 90 degree curb, and that's because of
the slopes on the camp property and to get good flow characteristics through that. On the south
side, near where your wetland complex is, it's called a ribbon gutter and that's essentially just a
concrete gutter to go and channel the flow and to keep the drainage characteristics.
Gretchen Starks: Probably going down to flow, and there will be a culvert going down over to
the new retaining pond, is that correct?
Fauske: There will be two culverts.
Gretchen Starks: From my, where mine is? Nothing has been changed so.
Papke: It might be helpful to point out where she lives.
Fauske: Certainly. Mrs. Starks lives at this location right there.
Papke: Oh, okay.
Fauske: What she's referring to Commissioner Papke is that there's a wetland complex right
through here. On the north side we're not putting storm sewer in the majority of Tanadoona
3
Planning Commission Meeting - August 7, 2007
Drive because of grades, so we're leaving that to the existing flow conditions which is going to
the south to the wetland complex through here, and what we're looking at, what Mrs. Starks
question is, as we've been working with her and her folks to come up with a plan for some...
running along here, her driveway location is right here. The wetland is coming in in this location
at the west side of the berm because we're unable to get this storm sewer to the pond that we're
proposing so this will carry a little bit of runoff. There's an existing culvert right here so we need
to put some storm sewer in through here and then of course further, keep it further to the west
we'll be replacing the culvert that existingly connects those two drainageways.
Gretchen Starks: So the berm should also keep some of that south and stuff from the road... ?
Fauske: Correct.
Gretchen Starks: Storms in the.
Fauske: Yes. It will channel it to the west.
Gretchen Starks: Excellent. That's all I wanted.
Papke: Thank you. Any other members of the public like to comment or question? Okay.
Seeing none, bring it back to the commissioners. Any comments? Issues? Things you want to
discuss?
Larson: No, I'm good.
Papke: Alright, I'll entertain a motion.
Larson: The Planning Commission recommends that the City Council Wetland Alteration
Permit. Is this the correct one?
Papke: Yep.
Larson: 0-17 to permit 2,100 square feet of wetland alteration subject to the following
conditions, 1 through 4.
Papke: Okay. Is there a second?
Thomas: Second.
Larson moved, Thomas seconded that the Planning Commission recommends that the
Planning Commission approve Wetland Alteration Permit 07-17 to permit 2,100 square
feet of wetland alteration subject to the following conditions:
1. Erosion control blanket shall be installed on all slopes greater than or equal to 3: 1. All
exposed soil areas shall have temporary erosion protection or permanent cover year round,
4
Planning Commission Meeting - August 7, 2007
according to the following table of slopes and time frames:
Type of Slope
Steeper than 3:1
10:1 to 3:1
Flatter than 10: 1
Time
7 days
14 days
21 days
(Maximum time an area can
remain open when the area
is not actively being worked.)
These areas include constructed stormwater management pond side slopes, and any exposed
soil areas with a positive slope to a stormwater conveyance system, such as a curb and gutter
system, storm sewer inlet, temporary or permanent drainage ditch or other natural or man
made systems that discharge to a surface water.
2. A minimum of six trees will be planted on site. Native species shall be used.
3. Tree protection fencing shall be installed at the edge of grading limits prior to any
construction activity.
4. Tree removal limits shall be inspected by the Environmental Resources Specialist prior to
any removals."
All voted in favor and the motion carried unanimously with a vote of 4 to O.
5