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PC DATE: May 16,2006
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CC DATE: June 12,2006
CITY OF CHANHASSEN
REVIEW DEADLINE: July 3,2006
CASE #: 06-17
BY: LH, DA
STAFF REPORT
PROPOSAL:
Wetland Alteration Permit for 2005 MUSA Area Wetland Basins 5, 6 and 8
LOCATION:
NE ~ of Section 27 and SE ~ of Section 22, Township 116N, Range 23 W.
APPLICANT:
City of Chanhassen
c/o Paul Oehme
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
fi1,'
PRESENT ZONING: PUD-R, RLM
2020 LAND USE PLAN: Residential Low Density, Residential Medium Density, Office
Industrial and Open Space
ACREAGE: 0.72 DENSITY: nla
SUMMARY OF REQUEST: Request for a Wetland Alteration Permit for filling 0.72 acres
of Type 1 wetland for the construction of a public street and roundabout in the Chanhassen 2005
MUSA area.
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
Bluff Creek Boulevard Roundabout
Wetland Alteration Permit
Planning Case No. 06-17
City of Chanhassen
2006 MUSA Area Wetland Alteration Permit
Planning Case #06-20
May 16, 2006
Page 2 of4
BACKGROUND
As part of the 2005 MUSA expansion area, the City of Chanhassen will install a public roadway
to connect Audubon Road and Powers Boulevard. As part of this public infrastructure, the
alignment of the roadway impacts three wetlands as part of the public infrastructure installation.
Two of the wetlands are impacted during the construction of the East/W est Collector road and
wetland basin 8 is impacted by the placement of the roundabout on the collector road. The City
of Chanhassen as the LGU needs to issue a wetland alteration permit to approve the impact and
mitigation to Basins 5, 6 and 8.
The original submittal included the impact summary and mitigation plan for Basin 8. An
addendum dated May 5,2006 identifies additional impacts to Basins 5 and 6 and proposed
mitigation. The mitigation plan is currently being submitted to ensure that the wetland
replacement plan is approved prior to construction.
WETLANDS
Existing Wetlands
Basin 5 is an 8.95 acre, Type 4 wetland located in the southeast quarter of the southeast quarter
of Section 22. The basin is dominated by reed canary grass and clover.
Basin 6 is a 1.69 acre, Type 3 wetland located in the southeast quarter of the southeast quarter of
Section 22. The basin is dominated by reed canary grass and black willow.
Basin 8 is a Type 1 wetland located in the NE 1,4 of section 27, East of Audubon Road and south
of Lyman Boulevard. The basin is dominated by reed canary grass transitioning to smartweed,
ragweed and eventually soybeans in the recently harvested area.
Wetland Impacts
The applicant submitted an application for 0.56 acres of wetland fill in Basin 8. The addendum
proposes additional impacts to Basins 5 and 6. The total additional impacts indicated on the
addendum (Attachment #3) are 0.16 acres. The applicant is proposing to replace the impacts to
the Type 1 wetlands by creating 0.32 acres of Type 1 mitigation connected to Basin 5 and the
proposed mitigation area for Basin 8.
The proposed project proposes filling within three wetland basins within the project area.
Proposed wetland impacts are as follows.
Basin 5: 0.12 acres of Type 1 wetland
Basin 6: 0.04 acres of Type 1 wetland
Basin 8: 0.56 acres of Type 1 wetland
Total Wetland Impacts: 0.72 acres of Type 1 Wetland
Total Wetland Mitigation Required: 1.44 acres (NWC and PVC)
2006 MUSA Area Wetland Alteration Permit
Planning Case #06-20
May 16, 2006
Page 3 of4
Wetland Mitigation
Wetland replacement is required at a 2 to 1 ratio. The replacement of wetland will be
accomplished by creating 1.12 acres (48,786 square feet) of new Type 1 wetland connected to
Basin 5 within the 2005 MUSA area. Additionally, the applicant's engineer is currently in the
process of drawing plans to show the additional 0.32 acres of replacement wetland in
conjunction with the 1.12 acres that were proposed in the original submittal. The applicant must
provide plans for the mitigation of the additional 0.32 acres of wetland to City staff for review
and approval prior to wetland impacts occurring.
The topography will be blended to match the existing grade of Basin 5. After the new wetland
credit and public value credit is excavated the area will be seeded with a BWSR-2 seed mix and
the 10 foot buffer at the wetland setback will be seeded with a BWSR-5 seed mix to assist with
slope stabilization.
A five year monitoring plan as required by the Wetland Conservation Act has been developed. A
report will be submitted annually for 5 years to ensure the success of the created wetland.
ANALYSIS
Initially, the applicant had considered additional mitigation sites. Other mitigation sites were not
determined suitable due to their lack of hydrology, proximity to proposed developments and
location of proposed storm water ponds by developers. Sequencing options considered were:
1) Wetland avoidance option
This option was considered during sequencing however, total wetland avoidance was
not considered feasible to accommodate property owners in the developing parcels
while minimizing wetland and floodplain impacts.
2) No Build option
The no-build option would avoid direct impacts to wetland basinS, 6 and 8 however,
this option would fail to allow the City of Chanhassen to meet it's development goals
and fails to make use of available space in Chanhassen. The no-build option was
dismissed as not-feasible or prudent.
In addition to the avoidance and no-build option the applicant considered comments received
from commenting agencies on the slopes adjacent to the proposed mitigation areas. The
comments indicated that the slopes should be reduced if at all possible and alternate mitigation
areas shall be considered if needed. In investigating the plans which identified the 3: 1 slopes it
appears that reducing the slopes is not an acceptable option due to the buried sanitary line at the
top of the slope. Alternate sites were not considered due to reasons previously addressed.
Erosion Control
All exposed soils must be temporarily stabilized and seeded within the 7, 14 and 21 day time
frames, depending upon slopes. Erosion control blanket should be used in concentrated flow
areas and for slopes of 3: 1. All remaining areas shall be mulched and seeded to control erosion.
2006 MUSA Area Wetland Alteration Permit
Planning Case #06-20
May 16,2006
Page 4 of4
Other Agencies
The applicant shall obtain a permit from the Minnesota Pollution Control Agency and comply with
their conditions of approval.
RECOMMENDA TION
Staff recommends the Planning Commission adopt the following motion:
"The Planning Commission recommends the City Council approve Wetland Alteration Permit
06-17 subject to the following conditions:
1. Wetland replacement shall occur in a manner consistent with the Minnesota Wetland
Conservation Act (MR 8420) at a ratio of 2:1.
2. The applicant shall provide plans for the mitigation of the additional 0.32 acres of wetland to
City staff for review and approval prior to wetland impacts occurring.
3. All exposed soils from temporary haul routes, exposed slopes above the normal water level
(NWL) and adjacent areas to the project shall be temporarily stabilized and seeded within the
7, 14 and 21 day time frames, depending upon slopes. Any concentrated flow areas shall
receive temporary protection.
4. Erosion control blanket shall be used in concentrated flow areas and for slopes of 3:1. All
remaining areas shall be mulched and seeded to control erosion.
5. The applicant shall apply for NPDES Phase II Construction Permit and comply with their
conditions of approval."
ATTACHMENTS
1. Findings of Fact.
2. Affidavit of Mailing.
3. Addendum to wetland mitigation plan dated May 5, 2006.
4. Drawing of additional wetland impacts to Basins 5 and 6.
5. 2005 MUSA Area Mitigation Plan for Basin 8 by Houston Engineering (selected pages).
g:\plan\2006 planning cases\06-17 bluff creek boulevard roundabout wap\06-17 staff report pc. doc
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
FINDINGS OF FACT
AND RECOMMENDATION
IN RE: The application of the City of Chanhassen
Planning Case No. 06-17
On May 16,2006, 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 filling 0.72 acres of wetland for the construction of a public street and roundabout in the
Chanhassen 2005 MUSA Area.
The Planning Commission conducted a public hearing on the proposed development which was
preceded by published and mailed notice. The Planning Commission heard testimony from all
interested persons wishing to speak. The Planning Commission now makes the following:
FINDINGS OF FACT
1) The properties are currently zoned RR (Rural Residential).
2) The properties are guided by the Land Use Plan for Residential Low Density, Residential
Medium Density, Office/Industrial and Parks/Open Space.
3) The properties are located in Chanhassen, Minnesota (Sections 22 and 27, Township 116
North, Range 23 West), Carver County.
4) Three wetlands on the subject properties are proposed to be impacted.
5) The total amount of wetland impact proposed is 0.72 acres.
6) The replacement of wetland at a 2: 1 ratio will be accomplished through the creation of
wetlands on the subject properties.
7) Section 20-404 of the City Code stipulates that there should be no net loss of wetlands.
Finding: The project proposes wetland replacement through the construction of
wetlands on-site therefore there will be no net loss of wetlands.
8) Section 20-407 of the City Code requires an applicant for a wetland alteration permit must
demonstrate compliance with the sequencing requirements set forth therein.
Finding: The proposed project is compliant with the sequencing requirements.
9) Section 20-408 of the City Code requires a wetland alteration permit for the construction of
new streets within wetlands.
Finding: Upon receipt of a wetland alteration permit, the project will be in compliance
with this requirement.
10) The planning report for Planning Case #06-17, dated May 16, 2006, prepared by Lori
Haak is incorporated herein.
RECOMMENDA TION
The Planning Commission recommends that the City Council approve the Wetland
Alteration Permit for Planning Case #06-17 for the filling of 0.72 acres of wetland for the
construction of a public street and roundabout in the Chanhassen 2005 MUSA Area - BLUFF
CREEK BOULEVARD ROUNDABOUT.
ADOPTED by the Chanhassen Planning Commission this 16th day of May, 2006.
CHANHASSEN PLANNING COMMISSION
BY:
Its Chairman
G:\PLAN\2006 Planning Cases\06-17 Bluff Creek Boulevard Roundabout W AP\Findings of Fact PC.doc
CITY OF CHANHASSEN
AFFIDA VIT 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
May 4, 2006, 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
Bluff Creek Boulevard Roundabout Wetland Alteration Permit - Planning Case 06-17 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 ~day of Mi .20.06.
Y IW\- T. m" ~
~ -9 Not~
KIM T. MEUWISSEN I
Notary Public-Minnesota
My Commission Expires Jan 31, 2010
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Disclaimer
This map is neither a legally recorded map nor a survey 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 9466.03, 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 arise out of the use~s access or use of
data provided.
D
Disclaimer
This map is neither a legally recorded map nor a survey 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 9466.03, 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 arise out of the use~s access or use of
data provided.
GMAC MODEL HOME FINANCE, INC
6802 PARAGON PLACE #350
RICHMOND VA 23230-1650
PETERSON-JACQUES
FARM LAND CO
15900 FLYING CLOUD DR
EDEN PRAIRIE, MN 55347-4047
Public Hearing Notification Area (500 feet)
Bluff Creek Boulevard Roundabout
Wetland Alteration Permit
Planning Case No. 06-17
City of Chanhassen
Houston Engineering, Inc.
10900 73m Ave. N., Ste. 106 Ph. (763) 493-4522
Maple Grove, MN 55369 Fax (763) 493-5572
(External correspondence)
Date: 5-5-2006
From: Sara Beth Scadlock, Houston Engineering
Chadd Larson, Kimley-Horn and Associates
To: Don Asleson, CityofChanhassen Subject: Additional Wetland Impacts
Description: It has come to the attention of Kimley-Hom and Associates that there will be two small
additional areas of wetland impact in addition to the 0.56 acres of Type 1 wetland in
Basin 8. These additional areas of impacts are due to the 3:1 slope from Bluff Creek
Boulevard. The wetland impacts are 0.12 acres in Basin 5 and 0.04 acres in Basin 6
(See attached drawing for details).
These impacts are for the purpose of constructing public infrastructure for the City of
Chanhassen's 2005 MUSA expansion area (City Project No. 06-05). An application
for impacts and a mitigation plan was submitted to the LGU, the City of Chanhassen.
Wetland mitigation: Proposed onsite wetland mitigation includes the construction of a new wetland area
adjacent to existing wetland area. The area of proposed onsite wetland creation is
located on the east side of Bluff Creek adjacent to the east boundary of Basin 5. The
wetland creation will result in a total of 1.12 acres (original) 0.32 acres (additional) for
a total of 1.44 acres of New Wetland Credit (NWC) on site.
Houston Engineering is currently in the process of drawing plans to show the
additional 0.32 acres of replacement wetland in conjunction to the 1.12 acres that that
were discussed in the wetland mitigation plan. These revised drawings will be
submitted to the City for review.
Summary of Impacts: Original Impacts
Basin 8
2: 1 Replacement
0.56 acres
1.12 acres
Additional Impacts
Basin 5
Basin 6
2:1 Replacement
0.12 acres
0.04 acres
0.32 acres
Total Impacts
Total Replacement
0.72 acres
1.44 acres
. Page 1 of1
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PROJECT SUMMARY
BASIN 8 WETLAND MITIGATION PLAN
Applicant:
City of Chanhassen, Paul Oehme, PE
Agent:
Kimley-Hom and Associates, Inc., Chadd Larson, PE
Suite 345N, 2550 University Ave. W
St. Paul, MN 55114
Report by:
Houston Engineering, Inc., Sara Beth Scadlock
Suite 106, 10900 73rd Ave. N
Maple Grove, MN 55369
Site Location:
South of Lyman Blvd. and East of Audubon Road in the City of
Chanhassen, 2005 MUSA Area, TII6N, R23W, Section 27,
Carver County
WCALGU:
City of Chanhassen
))ate:
April, 2006
Description:
The City of Chanhassen proposes to impact 0.56 acres of Type 1
wetland, Basin 8, for the purpose of constructing public
infrastructure for the City of Chanhassen's 2005 MUSA expansion
area (City Project No. 06-05).
Wetland mitigation: Proposed onsite wetland mitigation includes the construction of a
new wetland area adjacent to existing wetland area. The area of
proposed on site wetland creation is located on the east side of
Bluff Creek adjacent to the east boundary of Basin 5. The wetland
ctea~ion will result in 1.12 acres of New Wetland Credit (NWC) on
site.
April 2006 -Basin 8 Mitigation Plan
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Basin 8 Wetland Mitigation Plan
I. INTRODUCTION
The City of Chanhassen is proposing to construct infrastructure associated with their
2005 MUSA expansion area (City Project No. 06-05). This site, partially agricultural
land, is located south of Lyman Blvd and east of Audubon Road in the City of
Chanhassen, and is in the Riley Purgatory Bluff Creek Watershed District. T116N,
R23W, Sec. 22. Carver County, Minnesota (Figure 1).
This public infrastructure project is proposed for the purpose of meeting the needs of
future development as a part of the City of Chanhassen's 2005 MUSA area expansion.
As a part of the project development an Alternative Urban Area Review (AUAR) was
completed for the entire project area. This AUAR identified the need for Bluff Creek
Boulevard to travel through the project area and intersect with Audubon Road to the west
and Powers Boulevard to the east. In addition, the AUAR identified the need for a south
connector road to connect Bluff Creek Boulevard to Pioneer Trail to accommodate future
traffic demands.
One wetland (Basin 8) was identified and delineated for this section of the project on
November 1, 2005. Previous delineations on this site for this project by Houston
Engineering include Basins 1-6 which were delineated in a previous report presented to
the City of Chanhassen on May 26, 2005 and Basin 7 delineated in a previous report
presented to the City of Chanhassen on October 28, 2005. Figure 2 shows all the existing
wetlands delineated by Houston Engineering for this project (Basins 1-8) and Figure 3 is
a detailed delineation map of Basin 8. A full wetland delineation report including NWI
maps, soils maps, and data sheets for Basin 8 is attached (Attachment A). Other wetlands
associated with other portions of the MUSA area expansion were delineated by other
consultants and are not discussed in this report.
The infrastructure project addressed in this report would impact a total of 0.56 acres of
wetland (Figure 4). This wetland was classified as a Type 1. Using the Cowardin system
April 2006 - Basin 8 Mitigation Plan
2
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the wetland is a palustrine system with emergent vegetation that has a seasonally flooded
regime and is partially drained (PEMCd). The following pages represent the sequencing
discussion and describe the proposed wetland mitigation plan of expansion of Basin 5 in
more detail. Figure 5 and 6 show the proposed on-site mitigation area and grading plan.
II. SEQUENCING DISCUSSION
The following section discusses wetland avoidance, impact, minimization, impact
reduction and replacement in compliance with Minnesota Wetland Conservation (WCA)
requirements. This sequencing discussion includes a summary of alternatives that were
considered and changes that were made to the development plan to minimize wetland
impacts. All avoidance and minimization options considered met the following goals for
the development.
. Provide for sufficient residential housing units to compensate for infrastructure
expenses (roads, utilities, ponds, etc.) construction costs, and land costs.
. Provide safe access to the site consistent with City planning.
. Minimize direct, indirect, and long-term impacts to on-site wetlands and other
natural resources on site.
The following alternatives were evaluated within the criteria and constraints described
above.
Wetland Avoidance
Using WCA guidelines, the wetland avoidance alternatives considered and evaluated
included the no-build and alternate project designs that avoid all wetland impacts.
Alternative Project Designs
The proposed Bluff Creek Boulevard roadway alignment was chosen from numerous
alternatives through multiple meetings with adjacent property owners (Attachment B),
developers, and the City. The wetland, Basin 8, that is impacted by the construction of
Bluff Creek Boulevard is located at the intersection with the future south connector
roadway to Pioneer Trail. The location of this intersection was determined based on
input from adjacent property owners and evaluating the best design alternatives based on
the proposed roadway alignment and profile. This will be a roundabout intersection
April 2006 - Basin 8 Mitigation Plan
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which will enhance the overall roadway. The current roadway alignment minimizes flood
plain and wetland impacts. Alternative project designs that avoid wetland impacts and
allow the applicant to effectively utilize buildable upland areas ofthe site are not feasible.
Other intersection locations were evaluated however the current location was selected
based on the desire to accommodate both adjacent properties owners' site development
plans and minimize the disturbance to other wetlands and natural land features. A
conventional tee intersection was considered as an option however there was strong
support to enhance the roadway with a roundabout intersection, which also played a role
in the intersection location determination.
No-Build Alternative
The no-build alternative would avoid direct impacts to Basin 8, but would not allow the
City of Chanhassen to utilize the surrounding properties as identified in the AUAR. The
City of Chanhassen Comprehensive Plan indicates that a residential development would
be an appropriate use for the surrounding properties given the access to existing roads,
other developments in the area and planned future land uses. Single family home
development is compatible with adjacent land use. Abandoning the proposed project
fails to meet the project goals of the City of Chanhassen and does not make use of
available space within the City. Logistically, the development of this project represents
safe and efficient use of available property. For those reasons the no-build alternative
was not considered feasible or prudent and was rejected.
It was determined that practical and feasible alternative project designs that avoid all
direct impacts to wetland areas are not present within the scope of the development,
project goals, and site constraints.
Wetland Impacts
The proposed project plan (Figure 4) attempts to balance efficient land use and minimize
wetland and other environmental impacts during and after construction of the proposed
project. Wetland Basin 8 was identified for this project (Figures 2 and 3). Wetland
April 2006 - Basin 8 Mitigation Plan
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impacts, which are confined to only Basin 8, are necessary for construction. Impacts
total 24,393 sq ft (0.56 acres).
Wetland Impact Rectification
No temporary impacts are proposed with this plan. Impact rectification does not apply.
Summary of Unavoidable Impacts
The proposed plan represents a reasonable effort to accommodate the desired
development while minimizing wetland impacts, and replacing unavoidable impacts
where appropriate. The proposed plan results in 0.56 acres of unavoidable fill. Impacts
to wetlands have been minimized to the extent possible within the context of project
goals. The wetland impact area is dominated by reed canary grass.
III. WETLAND MITIGATION PLAN
Replacement ReQuirement
Proposed direct wetland impacts involve filling 24,393 sq ft (0.56 acres) of Basin 8 for a
roadway (Figure 4). The City ofChanhassen and the WCA wetland rules require wetland
replacement at a 2:1 ratio. Wetland mitigation areas will be constructed by excavation
down to elevations equal to the adjacent existing wetland selected for an appropriate
mitigation area which is Basin 5.
Table 1 - Impact and Mitigation Summary
Proposed Wetland Impact - Basin 8 (Type 1)
Sq Ft Acres
24,393 0.56
2:1 Replacement Ratio
Sq Ft Acres
48,786 1.12
Onsite New Wetland Creation (sq ft) - Basin 5 (Type 1)
Sq Ft Acres
48,486 1.12
April 2006 - Basin 8 Mitigation Plan
5
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On-Site Mitieation
Of the several sites considered and after discussions with other developers working on
the project and the City of Chanhassen staffthe proposed onsite wetland mitigation area
will be excavated from upland adjacent to Basin 5 (Figures 5 and 6). Excavation using
heavy and small equipment will expand the wetland area. Runoff from backyards is
planned to enter the wetland basins after sediments and nutrients have been removed by
the upland buffer areas. Buffer areas are designed between the proposed bike path and
the created wetland area.
The wetland creation area will be excavated to match the existing elevation of Basin 5
and graded to blend into the existing topography ofthe site. This will improve the
success for wetland hydrology in the created wetland area. A herbicide will be applied to
the soils and will be prepared for seeding of wetland vegetation. After final grading the
replacement wetland will be seeded with BWSR seed mix No.2 or equivalent at a
minimum suggested rate of 8 lbs/acre and a 10 foot buffer area will be seeded with
BWSR seed mix No.5 to assist with slope stabilization and protect the created wetland
from upland species encroachment (Attachment C). Seeding will be according to
specifications with clean mulch tacked to the ground. The wetland is expected to develop
to the 871 contour and will receive hydrology from the seasonal flooding of Bluff Creek
as well as some groundwater and surface water influences. See wetland mitigation
drawings (Figures 5 and 6) for grading details. The wetland will be maintained as needed
and as suggested in Attachment D. Other proposed onsite mitigation areas were
eliminated due to their lack of hydrology, proximity to the proposed developments, and
locations of proposed stormwater ponds by other developers.
April 2006 - Basin 8 Mitigation Plan
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Monitorinl! Plan
Requirements for monitoring mitigation wetlands as described in WCA will be followed.
The WCA rules require that an annual report be submitted for 5 years to ensure the
success ofthe created wetland areas. The report must contain a description ofthe project
location, size, current wetland type and desired wetland type; a comparison ofthe as-built
specifications versus the design specifications; hydrology measurements; plant
cOlnmunities observed; and color photographs ofthe project area. Annual reports should
be submitted to the City of Chanhassen.
April 2006 - Basin 8 Mitigation Plan
7
Bluff Creek
Residential Development
Legend
~ PropertyBoundary
c::J Section Line
c::J Actual Wetlands
Water Features (MN ONR 24K)
D Waterbody or River
- Stream or Drainage Ditch (Perennial)
Transportation (MN DOT)
~ State Highway
~ County State-aid Highway
@ County Road
Background Image: 2003 U.S. Department of Agriculture,
Farm Services Agency, National Imagery Program (NAIP)
N
W_E
S
o 250 500
1,000
1,500
2,000
Feet
- -
Sheet:
HDu,'on Engineering, Inc.
Leave Nothing to ChanceTM
10900 73rd Avenue North, Suite 106
Maple Grove, MN 55369-5400
Bus: (763) 493-4522 Fax: (763) 493-5572
www.houstonenaineerinainc.com
~ CITY OF
~ CHARHASS!I
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7700 Market 81'w"d. PO Box 147. Chonhossen, Minnesota 55317
(952)-227-1100
(952)-227-1110 FolC
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LEGEND
tM, WETl..AN)
1'-'-'---'-'-'-'\
~.-.-._-_._._._!
DEU'EA. TED WETLAND
'.'If'
TREE
TREEUNE
CfEEKIWAlER
100 YEAR R.oOD Pl.AIN
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o 1 50.300 600
L- I
HORIZONT AL
SCALE
IIi
rEET
1IJIII'1- ~ Kimley-Horn
~ _ L ~ and Associates, Inc.
2~s.o UNl'.'fRSlTY "..'( Y.ES r. SUIT'( 34!:lo'"
51 Pt.Ul. w:mtSOTA, 55l'"
TtL tolD. (651) 64~-4197
F"AX NO (6~\) 645-5\1&
II ~ ,
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CITY OF CHANHASSEN
2005 MUSA AREA EXPANSION
IMPROVEMENTS
CITY PROJECT NO. 04-05
..:' /
,~
EAST-WEST COLLECTOR ROADWAY
LEGEND
r:=:J
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r:::::::l
~
m
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iOO-YEAR FLOODPLAIN
WETLAND MITIGATION-BWSR MIX NO.2
EXISTING WETLAND
WETLAND MITIGATION-BWSR MIX NO.5
App.
DRAWING NAME
BLUFF _WETLANDS
DESIGNED BY:
DRAWN BY:
CHECKED BY:
DATE:
PROJECT NO.
I HEREBY CERTIFY THAT THIS PLAN, SPECIFICATION
OR REPORT WAS PREPARED BY ME OR UNDER MY
DIRECT SUPERVISION AND THAT I AM A DULY
LICENSED PROFESSIONAL ENGINEER UNDER THE
LAWS OF THE STATE OF MINNESOTA.
=== ~-~-- - =~~;::-~-:.:.....' <j
CONTACT "GOPHER STATE ONE CALL" FOR LOCATIONS I
OF BURIED UTILITIES. CALL (651) 454-0002 OR
1-800-252-1166.
~~
o 40 80 160
r I
HORIZONTAL
SCALE IN FEET
GENERAL NOTES
SEE GRADING PLAN FOR ALL EXISTING AND PROPOSED GRADES AND ADDITIONAL
EXCAVATION NOTES FOR AREAS ADJACENT TO WETLAND
CONTRACTOR TO NOTIFY ENGINEER IF THERE ARE QUESTIONS REGARDING PLACEMENT
OF SEED MIXTURE DUE TO FIELD CONDITIONS.
SEE WETLAND RESTORATION NOTES BELOW AND THE WETLAND RESTORATION REPORT FOR
INFORMATION REGARDING GRADING/TILLING, APPLICATION OF HERBICIDES, MAINTAINANCE
SCHEDULES, PERFORMANCE STANDARDS, AND MONITORING PLAN.
WETLAND RESTORATION NOTES
1) MATERIALS
A) NATIVE WETLAND SEED MIXES:
1. NATIVE SEDGE/WET MEADOW MIX: BWSR MIX NO. 2 SEED, FRESH, CLEAN, DRY.
MINIMUM SUGGESTED RATE: 8 LBS/ ACRE.
2. NATIVE WETLAND FRINGE MIX: BWSR MIX NO. 5 SEED, FRESH, CLEAN, DRY.
MINIMUM SUGGESTED RATE: 8 LBS/ ACRE.
B) SELECTIVE HERBICIDES: EPA REGISTERED AND APPROVED, OF TYPE RECOMMENDED BY
MANUFACTURER FOR APPLICATION.
C) FERTILIZER: TYPE 2 CONFORMING TO MNDOT 3881, PHOSPHOROUS FREE FERTILIZER.
D) MULCHES:
1. MULCH: TYPE 3 CONFORMING TO MNDOT 3882.
2. ASPHALT EMULSION: ASTM 0 977, GRADE SS-1; NONTOXIC AND FREE OF
PLANT-GROWTH OR GERMINATION INHIBITORS.
2) CONSTRUCTION REQUIREMENTS
A) CONSTRUCTION SHALL CONFORM TO MNDOT 2575. EXAMINE AREAS TO RECEIVE WETLAND
VEGETATION FOR COMPLIANCE WITH REQUIREMENTS AND OTHER CONDITIONS AFFECTING
PERFORMANCE. PROCEED WITH INSTALLATION ONLY AFTER UNSATISFACTORY CONDITIONS
HAVE BEEN CORRECTED. PROTECT STRUCTURES, UTILITIES, SIDEWALKS, TRAILS,
PAVEMENTS, SILT FENCE AND OTHER FACILITIES, TREES, SHRUBS, AND PLANTlNGS FROM
DAMAGE CAUSED BY PLANTING OPERATIONS. PROTECT GRADE STAKES SET BY OTHERS
UNTIL DIRECTED TO REMOVE THEM.
1. IF NECESSARY, APPLY HERBICIDE AND/OR LIGHTLY TILL TEMPORARY COVER CROP AND
MULCH.
2. IF NECESSARY. APPLY FERTILIZER.
3. SOW SEED BY BROADCASTING. DO NOT BROADCAST SEED OR DROP SEED WHEN WIND
VELOCITY EXCEEDS 5 MPH. EVENLY DISTRIBUTE SEED BY SOWING EQUAL QUANTITIES
IN TWO DIRECTIONS AT RIGHT ANGLES TO EACH OTHER. DO NOT USE WET SEED OR
SEED THAT IS MOLDY OR OTHERWISE DAMAGED.
4. SOW SEED AT THE MINIMUM SUGESTED RATE.
5. LIGHTLY RACK SEED INTO TOP 1/16 INCH OF SOIL AND ROLL LIGHTLY.
6. MULCH WITH STRAW, LARGELY FREE OF WEEDS AND WEED SEED.
7. APPLY ASPHALT EMULSION TACKIFIER TO MULCH.
B) MAINTAIN AND ESTABLISH WETLAND BY WEEDING, REPLANTING, AND OTHER OPERATIONS.
IN THE EVENT OF SEEDING FAILURE REGRADE. LIGHTLY TILL AND REPLANT BARE OR
ERODED AREAS AND REMULCH.
C) TO PREVENT EROSION AND TO PROTECT THE WETLAND SEEDING ERECT SIL TFENCE THAT
WAS TAKEN DOWN FOR ACCESS TO THE WETLAND.
3) CONTINUING MAINTENANCE:
A) THE CONTRACTOR AND OWNER SHALL ENTER INTO A STANDARD YEARLY (OR OTHER
PERIOD AS NOTED IN THE WETLAND REPORT) MAINTENANCE AGREEMENT STARTING ON
THE DATE INITIAL MAINTENANCE SERVICE IS CONCLUDED. THE MAINTENANCE AGREEMENT
SHALL STATE SERVICES. OBLIGATIONS, CONDITIONS, AND TERMS FOR AGREEMENT PERIOD
AND FOR FUTURE RENEWAL OPTIONS.
'" CITY OF CHANHASSEN CITY PROJECT 06-05 SHEET 1 OF 2
BLUFF CREEK LOWLANDS SHEET NO.
PUBLIC INFRASTRUCTURE IMPROVEMENTS S.A.P. 194-125- 001
BID PACKAGE 2 00
ClIY OF S.A.P.
BLUFF CREEK BOULEVfRD
~ BASIN 8 MITIGATION COUNTY PROJECT 150
GRADING AND SE~G
~=~
Kimley-Horn
and Associates, Inc.
SBS
DJL
NAME
HOUSTON
ENGINEERING, INC.
X
MN L1C. NO.
X
PROJ. NUM
DATE:
910
910
900
900
900
890
870
890
890
880
880
880
870
870
DATUJ/ ELEV
~
~
~
DATUJ/ ELEV
~
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co
DA.TUJ/ ELEY
~
co
~
o~ oil)
"':0 u5u'i
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coN
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~~
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~
CO
I/)
~
CO
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~
0+00
0+00
1+00
0+00
1+00
WETLAND MITIGATION CROSS SECITON A-A
WETLAND MITIGATION CROSS SECITON C-C
WETLAND MITIGATION CROSS SECITON B-B
App.
DRAWING NAME
BLUFF_WETLANDS X SECTION
DESIGNED BY: SBS
DRAWN BY: DJL
CHECKED BY: NAME
DATE:
X
MN L1C. NO.
x
HOUSTON
ENGINEERING, INC.
I HEREBY CERTIFY THAT THIS PLAN, SPECIFICATION
OR REPORT WAS PREPARED BY ME OR UNDER MY
DIRECT SUPERVISION AND THAT I AM A DULY
LICENSED PROFESSIONAL ENGINEER UNDER THE
LAWS OF THE STATE OF MINNESOTA.
CONTACT "GOPHER STATE ONE CALL" FOR LOCATIONS
OF BURIED UTILITIES. CALL (651) 454-0002 OR
1-800- 252-1166.
~~
o
I
40
80
160
I
HORIZONTAL
SCALE IN
FEET
LEGEND
[2J lOO-YEAR FLOODPLAIN
r- . . . . . .1 EXISTIN G WETLAND
m WETLAND MITIGATION-BWSR MIX NO.2
~ WETLAND MITIGATION-BWSR MIX NO.5
'" CITY OF CHANHASSEN CITY PROJECT 06-05 SHEET 2 OF 2
BLUFF CREEK LOWLANDS SHEET NO.
PUBLICINFRASTRUCTUREINWROVEMENTS S.A.P. 194-125-001
BID PACKAGE 2 00
Cl1Y OF S.A.P.
BLUFF CREEK BOULEVARD
~ BASIN 8 MITIGATION COUNTY PROJECT 150
CROSS SECTIONS
~=~
Kimley-Horn
and Associates, Inc.
PROJECT NO.
PROJ. NUM
DATE: