Wetland Permit Application (2)January 29, 2014 RE: Southwest Reconnection Project
CSAH 61 and Highway 101
Reconstruction
SEH No. CARVR 119938 14.00
Ms. Melissa Jenny
Army Corps of Engineers
St. Paul District Office
180 5th Street East, Suite 700
St. Paul, Minnesota 55101-1678
Dear Ms. Jenny:
On behalf of Carver County, please find the enclosed application for the Southwest Reconnection Project,
which proposes to reconstruct CSAH 61 and the Highway 101 crossing of the Minnesota River. The
project is located primarily within the City of Chanhassen, Carver County, although the southern end is
within the City of Shakopee and Scott County. Carver County Public Works is the project proposer, and
is accepting the Highway 101 as a turn-back from the Minnesota Department of Transportation.
The project will impact 4.18 acres of wetland, and 0.68 acres of Public Waters associated with the
relocation of Bluff Creek, and for placement of bridge piers into Rice Lake and Minnesota River
floodplain. Total impacts for discharge and excavation into waters or wetland is 4.96 acres. The project
proposes to bridge Highway 101, which will allow for the removal of the existing causeway, and the
restoration of 9.82 acres of wetland on-site.
Mitigation is proposed through the Board of Water and Soil Resources transportation bank, as the project
is driven by safety and to meet state aid standards. A small amount of impact related to a pedestrian trail
will be replaced through purchase of wetland credits from a private bank.
Construction is proposed to start in the spring of 2014. This letter is a request for a Letter of Permission
from the USACE, a Public Waters Works Permit from the MNDNR, and approval of replacement plan for
the Wetland Conservation Act.
Thanks for your review and support of this project,
Rebecca Beduhn
Staff Biologist
drd
Enclosure
c: See list on back
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January 29, 2014
Page 2
c:
Lyndon Robjent, Carver County
Kristin Larson, Carver County
Terrence Jeffery, City of Chanhassen
Katherine Heinz, MNDOT
Sarma Straumanis, MNDOT
Molly Kline, MNDOT
Peter Leete, MNDOT
Bruce Loney, City of Shakopee
Mitch Rasmussen, Scott County
John Gleason, MNDNR
Melissa Doperalski, MNDNR
Ken Powell, BSWR
Lynda Peterson, BWSR
Greg Graczyk, Carver Soil and Water Conservation District
Len Kramer, Barr Engineering
Linda Loomis, Naiad Consulting, LLC
Wetland Permit Application
Carver County Public Works
Carver County, Minnesota
SEH No. CARVR 119938
January 2014
Wetland Permit Application
Southwest Reconnection Project: Highway 61/101 Flood Mitigation
Carver and Scott Counties
Cities of Chanhassen and Shakopee, Minnesota
SEH No. CARVR 119938
January 2014
I hereby certify that this wetland permit application was prepared by me, and the
procedures and field methods used constitute an official wetland delineation in
accordance with the 1987 U.S. Army Corps of Engineers Wetlands Delineation
Manual.
Name: Rebecca Beduhn
Certified Wetland Delineator-IT, No. 5109
Professional Soil Scientist-IT, No. 144868
Reviewed by:
Certified Wetland Delineator, No. 1009
Short Elliott Hendrickson Inc.
3535 Vadnais Center Drive
St. Paul, MN 55110-5196
651.490.2000
This Page Left Blank Intentionally
SEH is a registered trademark of Short Elliott Hendrickson Inc.
Wetland Permit Application CARVR 119938
Carver County Page i
Table of Contents
Minnesota Local/State/Federal Application Forms for Water/Wetland Projects
Minnesota WCA Application for Certificate of No Loss or Exemption
Department of Natural Resources Water Permit Application Fees Form
Certification Page
Table of Contents
Page
1.0 Summary ....................................................................................................................1
1.1.1 Project Description .................................................................................. 1
1.1.2 Purpose and Need Statement ................................................................. 1
1.1.3 Wetland Impacts...................................................................................... 1
1.1.4 Wetland Creation .................................................................................... 1
1.1.5 Wetland Mitigation – Roadway Safety Improvements ............................. 2
1.1.6 Wetland Mitigation – Trail Impacts .......................................................... 2
2.0 Introduction ................................................................................................................2
2.1 Contact Information ............................................................................................. 3
2.2 Project Location .................................................................................................. 3
3.0 Purpose and Need .....................................................................................................4
4.0 Project Description ....................................................................................................4
4.1 Highway 101 Bridge Replacement ...................................................................... 4
4.2 CSAH 61 Improvements ..................................................................................... 5
4.3 Bluff Creek Realignment ..................................................................................... 5
4.4 Pedestrian Trail ................................................................................................... 5
4.5 Storm Water Treatment ...................................................................................... 6
4.6 Project Costs ....................................................................................................... 6
4.7 Existing Conditions ............................................................................................. 6
4.7.1 Safety ...................................................................................................... 7
4.7.2 Flood Events ........................................................................................... 7
4.7.3 Construction Methods ............................................................................. 8
4.7.4 Mobility .................................................................................................... 9
5.0 Wetlands .....................................................................................................................9
5.1.1 Wetland Delineations .............................................................................. 9
5.2 Results .............................................................................................................. 10
5.2.1 Bluff Creek ............................................................................................ 10
5.2.2 Minnesota River Floodplain ................................................................... 11
6.0 Sequencing ..............................................................................................................11
6.1 Project Alternatives, Avoidance, and Minimization ........................................... 11
6.1.1 No-build Alternative ............................................................................... 11
6.1.2 CSAH 61 Alternative 1 – Design and Location Alternatives .................. 11
6.1.3 Highway 101 Alternative 2 – Design and Location Alternatives ............ 12
6.1.4 Alternative 3 – Preferred Alternative ..................................................... 12
6.1.5 Summary of avoidance and minimization .............................................. 13
Table of Contents (Continued)
Wetland Permit Application CARVR 119938
Carver County Page ii
7.0 Wetland Impacts ......................................................................................................13
7.1 Bluff Creek Impacts ........................................................................................... 13
7.2 Pedestrian Trail Impacts ................................................................................... 14
7.1 Wetland Re-establishment ................................................................................ 14
8.0 Wetland Replacement Plan .....................................................................................14
8.1.1 BWSR Road Program ........................................................................... 15
8.1.2 Wetland Banking ................................................................................... 15
9.0 Permitting and Regulatory Jurisdiction ................................................................16
9.1 U.S. Army Corps of Engineers .......................................................................... 16
9.2 Wetland Conservation Act – City of Chanhassen ............................................. 16
9.3 Minnesota Department of Natural Resources ................................................... 17
10.0 Supplemental Information ......................................................................................17
10.1 U.S. Fish and Wildlife and MNDNR Property .................................................... 17
10.2 State Threatened and Endangered Species ..................................................... 18
10.3 Storm Water Treatment .................................................................................... 18
10.4 Archeological Resources .................................................................................. 18
List of Figures
Figure 1 – Site Location and Topographic Map
Figure 2 – Aerial Photograph (2012)
Figure 3 – MNDNR Public Waters Inventory
Figure 4 – National Wetlands Inventory
Figure 5 – Soil Survey for Carver and Scott Counties
Figure 6a- Wetland Delineation Results – North
Figure 6b- Wetland Delineation Results – South
List of Appendices
Appendix A - Project Plan Sheets
Appendix B - Wetland Delineation Report
Appendix C - TH 101 “Wye” Feasibility Study
Appendix D - Combined Wetland Application Forms
Appendix E - Wetland Banking Forms
s:\ae\c\carvr\119938\environmental\wetlands\wetland permit application\th 101 - csah 61 wetland permit application.docx
January 2014
CARVR 119938
Page 1
Wetland Permit Application
Southwest Reconnection Project: Highway 61/101 Flood
Mitigation
Prepared for Carver County Public Works
1.0 Summary
1.1.1 Project Description
The proposed Southwest Reconnection Project, located in the cities of Chanhassen and
Shakopee Minnesota, will construct a new 4,226-foot long four-lane bridge over the
Minnesota River floodplain area and will include roadway safety and capacity
improvements to Carver County State Aid Highway 61 (also known as Flying Cloud
Drive) from approximately 475 feet west of Bluff Creek Drive to approximately 350
feet east of the Highway 61/101 “Wye” intersection. The total length of improvements
along Highway 101 and Flying Cloud Drive is approximately 4,860 feet and 3,660-
feet, respectively.
1.1.2 Purpose and Need Statement
Highway 101 and CSAH 61 have safety and operational needs associated with the
roadways having to close during periods of flooding, whereby requiring traffic to find
alternative routes to cross the Minnesota River. There are also short- and long-term
capacity deficiencies with the growing travel demand along these corridors. Both
Highway 101 and CSAH 61 are currently experiencing peak hour traffic delays as the
traffic volumes are approaching or exceeding the capacities of these two-lane
roadways
1.1.3 Wetland Impacts
The project will impacts a total of 4.96 acres of wetland. This consists of 0.21 acres
for the new 101 crossing, and 3.76 acres of fill, 0.52 acres of excavation, and 0.47
acres for Bluff Creek realignment for the new round about and improvements to
TH61. Of these impacts, 3,593 sf (0.08 acre) are uniquely associated with a pedestrian
trail. Trail impacts are minimal, as they occur within the areas of proposed soils
correction.
1.1.4 Wetland Creation
Construction of the new bridge will allow for the removal of the existing causeway
(fill material) from the Minnesota River 100-year floodplain area. The removal of the
existing Highway 101 causeway across the Minnesota River floodplain area will have
a positive effect by allowing restoration of natural wetland/floodplain habitat to re-
Wetland Permit Application CARVR 119938
Carver County Page 2
establish. Approximately 427,983 ft2 (9.82 acres) are anticipated to re-establish natural
wetland/floodplain habitat through the removal of the exiting causeway.
The removal of the causeway cannot be used as part of the replacement plan, as it will
be part of the roadway right-of-way, and it is not feasible or prudent to place that area
under the required conservation easements. The restoration of this area is a significant
ecological improvement, and it is requested that it be considered in the overall
decision making
1.1.5 Wetland Mitigation – Roadway Safety Improvements
Wetland mitigation for this project is proposed through the Board of Water and Soil
Resources (BWSR) as this project is a safety improvement. TH101 has been subject
to frequent flooding and road closures. TH61 has had numerous accidents due to the
placement if multiple intersections in close proximity, and traffic volumes that exceed
the design requirements. Replacement of multiple intersections provides a safety
improvement, and will secondarily achieve improved traffic movement.
Wetland impacts associated with the roadway, bridge construction, storm water ponds,
and relocation of Bluff Creek are 4.88 acres. It is proposed to utilize the BWSR
roadway program, which would withdraw 9.76 acres to meet a 2:1 replacement ratio.
1.1.6 Wetland Mitigation – Trail Impacts
The proposed pedestrian trail will impact 0.08 acre of wetland. The trail is not a
safety improvement, and cannot utilize the BWSR roadway program. It is proposed to
withdraw 0.16 acres of wetland credit from the German Settlement bank, which is
within the same Bank Service Area, and therefore allows for replacement at a 2:1
ratio.
2.0 Introduction
This wetland permit application has been prepared to describe the proposed
construction of a new four-lane bridge spanning the Minnesota River floodplain area
between the existing Trunk Highway 101 Minnesota River Bridge in Shakopee,
Minnesota and County State Aid Highway (CSAH) 61/Flying Cloud Drive in
Chanhassen, Minnesota. For safety improvements, the Hwy 101/ County Hwy 61
“wye” intersection will be reconstructed as a roundabout to accommodate the new
Hwy 101 bridge. A pedestrian/bicycle trail will also be constructed along the north
side of CSAH 61.
The demonstration of wetland impact avoidance and minimization in this application
follows the sequencing process of the Minnesota Wetland Conservation Act (WCA) of
1991 and the federal Clean Water Act. These procedures require that projects that may
result in the draining or filling of wetland habitat should demonstrate avoidance and
minimization of such impacts. Wetland impacts that cannot be feasibly avoided or
minimized must be replaced by compensatory mitigation.
The proposed project will result in permanent impacts to wetland habitat for the
construction of the interchange at the Hwy 101/ County Hwy 61 and the construction
of the new four-lane bridge .This permit application is requesting:
1. Letter of Permission under Section 404 of the Clean Water Act, as administered
by the United States Army Corps of Engineers (USACE)
Wetland Permit Application CARVR 119938
Carver County Page 3
2. Water Quality Certification under Section 401 of the Clean Water Act, as
administered by the Minnesota Pollution Control Agency (MPCA) – Waived for
LOP projects.
3. Minnesota Department of Natural Resources (MNDNR) Public Waters Works
Permit
4. Approval of a wetland replacement plan under the Minnesota Wetland
Conservation Act (WCA)
An Environmental Assessment was completed, and was administered by the Federal
Highway Administration (FHA). A Finding of No Significant Impact (FONSI) was
issued by the FHA in September 2013.
The following information will discuss the project purpose and need, sequencing,
impacts, and proposed mitigation for the permanent and temporary loss of wetland
functions and values.
2.1 Contact Information
The following is a summary of the contacts for this project.
Table 1: Summary of Project Proposer, Agent, and Contact Information
Proposer: Carver County Agent Short Elliott
Hendrickson
Contact
Person Lyndon Robjent, P.E. Contact
Person Rebecca Beduhn
Title Public Works Director/
County Engineer Title Wetland Biologist
Address 11360 Highway 212, Suite 1 Address 3535 Vadnais Center
Dr.
City, state,
ZIP Cologne, MN 55322 City, state,
ZIP St. Paul, MN 55110
Phone (952) 466‐5200 Phone 651‐490‐2146
Fax (952) 466‐5223 Fax 651‐490‐2150
E‐mail lrobjent@co.carver.mn.us E‐mail rbeduhn@sehinc.com
2.2 Project Location
The project site is located in the eastern ½ of Section 35 and the western ½ of Section
36 in Township 116 North, Range 23 West in Cities of Chanhassen and Shakopee,
Carver County, MN; and the northern ½ of Section 1 in Township 115 North, Range
23 West in Shakopee, Scott County, MN as shown on Figure 1, and summarized in
Table 2. The area of investigation is approximately a 1 mile along TH 101 at the
intersections of TH101 and CSAH 61. The project area is detailed in Figure 2, and
summarized below.
Wetland Permit Application CARVR 119938
Carver County Page 4
Table 2: Summary of Project Location
County City Township Range Sections
Carver County
Scott County
City of Chanhassen
City of Shakopee
T116N
T115N
R23W
R23W
35 and 36
1
The current land use adjacent to the project is a mix of open space (U.S. Fish and
Wildlife Service Minnesota River Valley National Wildlife Refuge and the Minnesota
Department of Natural Resources Raguet Wildlife Management Area, low density
residential, light industrial and commercial developments.
3.0 Purpose and Need
The purpose of the project is to ensure Highway 101 and CSAH 61 remain open to
traffic during 100-year flood events, while also ensuring the transportation
improvements do not cause an increase in the 100-year floodplain elevation. The
project purpose also includes improving safety and mobility throughout the project
area by reducing intersections and adding capacity to both Highway 101 and CSAH
61 (Flying Cloud Drive).
4.0 Project Description
4.1 Highway 101 Bridge Replacement
The new bridge across the Minnesota River floodplain area, particularly over Public
Waters 10-221W and 27-132P (Rice Lake), is proposed to be constructed immediately
southwest of the existing roadway, which is built upon an elevated causeway.
The bridge will be approximately 4,226-feet long and 78.5-feet wide, and be
composed of 41 bridge sections, spaced every 105 feet. Forty piers and two abutments
will be needed to support the bridge sections. Thirty seven of these will be within all
or partially within wetland, and will consist of between 8and 11 bent piles with a
concrete cap to support the bridge sections. Some of the bent pile are within upland at
the bridge ends, or contain some bent pile within the existing causeway. In total, there
are 374 bent piles proposed to be within wetland, and each has been estimated to have
25 square feet of wetland impact.
The new four-lane bridge will accommodate two 12-foot driving lanes in each
direction with 8-foot outside shoulders. The new bridge will elevate the roadway
approximately 3 feet to 22 feet above the existing roadway, which will raise the
roadway above of the 100-year flood elevation and consequently minimize road
closures from flooding without increasing the 100-year flood elevation. It is
anticipated that pile driving and pier placement construction would begin during
summer of 2014.
Construction of the new bridge will allow for the removal of the existing causeway
(fill material) from the Minnesota River 100-year floodplain area. The causeway will
be removed to the elevation of approximately 700 feet above mean sea level (1929
NGVD), approximately 11-14 feet below the elevation of the existing roadway
surface. This will reduce the frequency and duration of roadway closures and restore
natural flows to the river under high water/flood conditions. Upon removal, some of
the old Highway 101 roadway material may be placed on a commercial property (Golf
Wetland Permit Application CARVR 119938
Carver County Page 5
Zone driving range) located along CSAH 61, but outside of wetland. Any material
removed off site will also be disposed of in an upland location.
4.2 CSAH 61 Improvements
Roadway and intersection safety improvements are proposed along Carver CSAH 61
(Flying Cloud Drive). The CSAH 61/Flying Cloud Drive roadway improvements
include adding a four-lane roadway section between the Highway 101 “Wye”
intersection on the east and Bluff Creek Road on the west. Two new roundabout
intersections are proposed at the Highway 101 “Wye” and Bluff Creek Drive
intersections, which will replace the current lighted intersections. The roundabouts
contain dedicated lanes for traffic that os passing through, and that is turning, to
reduce the amount of shared time with vehicles within the roundabout. The CSAH
61/Flying Cloud Drive improvements will maintain a traffic signal at the Highway 101
(American Boulevard)/Flying Cloud Drive intersection.
Muck soils are abundant in the project area, and soils corrections are required. These
corrections have expanded the project limits beyond what would be required for
construction in more stable soil types.
4.3 Bluff Creek Realignment
Bluff Creek currently passes under CSAH 61 (Flying Cloud Drive) and Highway 101
via twin box culverts. The proposed project includes replacement of the twin box
culverts under CSAH 61 (Flying Cloud Drive) and removal of four culverts under
Highway 101. These will be replaced with new bridge on CSAH 61, and by spanning
Bluff Creek with a bridge under Highway 101. In order to accommodate the new
roundabout, and align the creek to by crossed with the new 101 bridge, the creek
channel is proposed to be modified. He total length of Bluff Creek is proposed to be
extended from the current length of 421 linear feet between the box culverts on
CSAH 61 to the culverts under Highway 101, to a new channel length of 529 linear
feet. The realigned section of Bluff Creek will benefit from replacing culverts with
bridges, will be longer in total length, and will have more meanders than it currently
does.
4.4 Pedestrian Trail
The project also features pedestrian/bicycle trail improvements including a 10-foot
off-road trail located on the southwest side of the proposed river/floodplain bridge.
The trail corridor is proposed to cross under CSAH 61 (Flying Cloud Drive) in a
shared bridge crossing with Bluff Creek. In addition, an 8-foot off-road trail will
extend east along the north side of CSAH 61 (Flying Cloud Drive) to the eastern
project termini, which will connect to a future trail corridor in Hennepin County. The
proposed off-road trail will also extend west to Bluff Creek Drive where the trail will
run along the shoulder of Bluff Creek Drive until it connects with the Minnesota River
Valley LRT Trail, located approximately 0.25 miles north of CSAH 61 (Flying Cloud
Drive).
The trail will result in some wetland impacts on the north side of the 61/101
roundabout. Total impacts unique to the trail are 3,593 square feet. This is a small
number because the majority of the trail is located within areas that have had soils
correction for the roadway, and are already quantified within the roadway impacts.
Wetland Permit Application CARVR 119938
Carver County Page 6
The bridge crossing on CSAH 61 over bluff Creek will accommodate the trail and
have no additional impacts.
4.5 Storm Water Treatment
Four drainage and water quality features are proposed within the project area to
collect, convey, and/or treat surface water runoff. These features include drainage
ditches, grass swales, infiltration ponds, and wet detention ponds. These features are
being designed to meet local and state water quality standards.
The west pond has been placed primarily within an area of upland, but will require
excavation of wetland in order to get the required amount of treatment. The northeast
pond, which is associated with the roundabout, has the greatest wetland impact, but is
also providing the majority of treatment, and is utilizing the existing park and ride lot
to reduce wetland impacts. The remaining storm water features (bridge pond and
south pond) are placed entirely within upland, and will have no impacts.
4.6 Project Costs
Estimated Total Project Cost - $60,300,000 (includes construction, right-of-way, and
engineering). No federal funds are proposed for use on this project.
Project Funding
MnDOT Flood Mitigation Program: $20,000,000
Local Road Improvement Program (LRIP): $9,000,000
MnDOT Construction Engineering $8,200,000
County Turnback Funds: $12,400,000
Carver County: $7,500,000
Scott County: $2,300,000
City of Chanhassen: $900,000
TOTAL $60,300,000
4.7 Existing Conditions
Currently, TH 101 is a 2-lane undivided highway over the Minnesota River and up to
CSAH 18 (Lyman Boulevard). The south end of TH 101 over the river ends at the
intersection of Scott CR 69/CR 101. The north side of the river crossing ends at Flying
Cloud Drive through a “wye” intersection, which diverts traffic into eastbound and
westbound directions through two controlled intersections. The designated TH 101
jogs westerly on Flying Cloud before TH 101 continues up the bluff into Chanhassen.
CSAH 61 (Flying Cloud Drive) is a 2-lane undivided roadway in the study area with
turn lanes at four signalized intersections. The existing road runs westerly from the
project area through downtown Chaska and easterly through Eden Prairie before
ending at US 212.
The current configuration of the interchange with CSAH 61 and Highway 101 is
divided into a “wye”, which diverts east and west bound traffic to two intersections.
This increases the opportunities for accidents, and poorly manages the existing levels
of traffic volumes on these roadways.
Wetland Permit Application CARVR 119938
Carver County Page 7
4.7.1 Safety
Currently, the project area contains six (6) separate intersections. The signaled
intersection at 101 and 61, where 101 turns north into Chanhassen as Great Plaines
Blvd, will be reconstructed to have two thru lanes and dedicated turn lanes. The two
intersections with east and west bound CSAH 61 and Highway 101 will be replaced
by a single roundabout. The unsignaled intersection of Bluff Creek Dr. and Flying
Cloud Dr. will be replaced with a single-land roundabout.
Roundabouts were selected for the intersection because roundabouts are safer than
traffic signals and stop signs for both motor vehicles and pedestrians. Crash data from
January 1st, 2009 through December 31st, 2012 were obtained from MnDOT’s
Minnesota Crash Mapping Analysis Tool (MnCMAT). A total of 38 crashes occurred
in this time frame, none of which were fatal. According to MnDOT, installation of a
roundabout will reduce crashes by approximately a 39 percent. This is due to slower
speeds, and the angle of collision impact.
4.7.2 Flood Events
The Highway 101 Minnesota River crossing serves as an important component of the
state and regional transportation system by providing an essential traffic link across
the river for three counties; Carver, Hennepin and Scott Counties, as well as the
surrounding cities. The Highway 101 Minnesota River crossing is located below the
100-year flood elevation of the river.
Typically when there is flooding in the Minnesota River Valley both Highway 101
and nearby TH 41 are forced to close. The remaining open river crossings are US
Highway 169 and TH 25, located nearly 25 miles apart. During these seasonal flood
events, the detoured traffic adds a tremendous strain on the area’s regional
transportation system when Highway 101 and TH 41 river crossings are closed.
Three major flooding events between the spring of 2010 and the spring of 2011 closed
both the Highway 101 and Highway 41 river crossings for several weeks, which
prompted MnDOT to complete the Minnesota River Flood Mitigation Study in
September 2011. The Minnesota River Flood Mitigation Study calculated the daily
combined cost of both highway closures by applying the value of additional time and
miles traveled using the Metropolitan Council’s 2030 Regional Travel Demand
Model. The resulting cost was $670,000 per day in the year 2009, and is forecasted to
be $1,670,000 per day in year 2030. Using the study results, MnDOT was successful
in securing Flood Mitigation funding for the Highway 101 crossing of the Minnesota
River floodplain area.
Table 3: Days Highway 101 Crossing Was Closed During Flood Events (1965-2011)
Flooding Event *Highway 101 Days Closed
Spring 2011 43
Fall 2010 16
Spring 2010 27
Spring 2001 29
Spring 1997 18
Wetland Permit Application CARVR 119938
Carver County Page 8
Summer 1993 27
Spring 1969 17
Spring 1965 15
* Table Note: Data extracted from the 2010 Minnesota River Flood Mitigation Study. The study noted data
from the following: Data for 2010 and 2011 was provided by MnDOT. Data for 1993, 1997 and 2001 were
obtained from the Trunk Highway 41 Draft Environmental Impact Statement, Data for 1965‐1969 were
estimates from historic hydrograph plots and assuming the road is closed for three days beyond the date
when the water level dropped below the closure elevation to conduct maintenance and restoration work.
Highway 101 currently closes when flood waters reach an elevation of approximately
two feet below the low road elevation at the crossing, which requires closure at 709.4
feet. Table 1 below shows the surface elevations for the 10-year, 50-year, 100-year
and 500-year flood events. As shown in the table, even a 10-year flood event can
require closure of Highway 101. Exhibit 1 on the following page was taken from the
Minnesota River Flood Mitigation Study. The exhibit illustrates Minnesota River flood
events and the corresponding water elevations in relation to the current closure
elevation set by MnDOT.
Table 4: Existing TH 101 Flood Elevations, and associated Graph Showing the Frequency
of Overtopping Events.
Hydraulic Event Water Surface Elevation (ft, NGVD 29)
10‐Year Flood 712.0
50‐Year Flood 718.4
100‐Year Flood 720.7
500‐Year Flood 726.0
4.7.3 Construction Methods
The proposed project is anticipated to be constructed over two construction seasons
(summer 2014 through fall 2015). Maintaining travel during construction is proposed
to the extent practical. Temporary closures will be required for the various roadways
in the study area as certain stages of the project improvements are being constructed.
A preliminary construction staging plan has been developed that allows traffic across
the Minnesota River floodplain area throughout the duration of construction. Traffic
would continue to use the existing roadway while the new four-lane bridge is
constructed immediately west of the existing roadway. The causeway (existing land
bridge) will be removed to the elevation of approximately 700 feet above mean sea
Wetland Permit Application CARVR 119938
Carver County Page 9
level, which is approximately 11-14 feet below the elevation of the existing road
surface.
The proposed improvements along Carver County Road 61/Flying Cloud Drive and
the Highway 1010 Bridge will be staged in order to maintain traffic during
construction to the greatest extent possible. Due to poor/muck soils found under the
existing road, the reconstruction of County Road 61 will require the removal of these
poor soils and replacement with a select granular sub-base material. The depth of
excavation for purposes of correcting the soil material ranges from only a few feet to
over twenty feet.
The anticipated construction technique for the bridge across the floodplain area will
consist of placing prefabricated beams on already constructed piers and abutments.
Once the beams are placed, then the remaining operations of forming and pouring the
bridge deck curb and gutter, and barriers can be completed.
The portion of the project that consists of constructing new roadway will consist of
placing and compacting material for new roadway and embankments. It is anticipated
that the material excavated on the project will be re-used for overlay, aggregate or
embankment purposes where appropriate and in accordance with best management
practices established in MnDOT’s Standard Specifications for Construction.
4.7.4 Mobility
The 2010 Average Annual Daily Traffic (AADT) along the Highway 101 crossing and
Trunk Highway 41 crossing was approximately 19,000 and 17,000 respectively.
Traffic operations data indicates that two-lane roadways begin to experience
noticeable problems once they exceed 10,500 – 12,000 vehicles per day. Design
standards suggest that 4-lane roadways would be required based on existing traffic
counts.
5.0 Wetlands
5.1.1 Wetland Delineations
Prior to visiting the project area, resources were consulted to map potential wetlands
(Level 1 Delineation). Resources used to estimate wetlands for the Level 1
Delineations include: National Wetlands Inventory (NWI) mapping, DNR Public
Water Inventory (PWI) mapping, County Soil Survey mapping, DNR Minnesota Land
Cover Classification System (MLCCS) mapping, Floodplain Mapping, USGS
Topographic Mapping, MnDOT Video Road Log, and Current and Historical Aerial
Photography.
These sources identify wetland areas that were investigated in greater detail during the
field delineation. A field visit was conducted to verify all level 1 delineations on the
MnDOT and Carver County Right-of-Way.
The project site was examined conducted in August 2012, and June of 2013 for areas
meeting the technical wetland criteria in accordance with the U.S. Army Corps of
Engineers Wetland Delineation Manual (USACE 1987) and the Regional Supplement
to the Corps of Engineers Wetland Delineation Manual: Midwest Region (USACE
2010).
Wetland Permit Application CARVR 119938
Carver County Page 10
5.2 Results
Thirteen (23) wetlands were delineated within the project site by MnDOT and SEH as
reported in the wetland delineation report, and as summarized in Table 1. These
wetlands delineated by MnDOT are labeled with a “D” prefix, while those completed
by SEH start with an ”S.”
More detailed information on the wetland delineation is available in the Wetland
Delineation Report.
Table 5: Wetland Characteristics
Basin
ID
Cowardin
Classification
Circular 39
Classification
Eggers & Reed Classification
S1 PEMB Type2 Fresh (wet) Meadow
S2 PEMB/PEMA Type2/ Type 6 Fresh (wet) Meadow/ Floodplain Forest
S3 PEMC Type 3 Shallow Marsh
S4 PEMB Type 3 Shallow Marsh associated with Bluff
Creek
S5 PEMB Type2 Fresh (wet) Meadow
S6 PEMC Type 3 Shallow Marsh
S7 PEMB Type2 Fresh (wet) Meadow
S8 PEMC Type 3 Shallow Marsh
S9 PEMB Type2 Fresh (wet) Meadow
S10 PEMB Type2 Fresh (wet) Meadow
D1 PEMB Type2 Fresh (wet) Meadow
D2 PFO1A Type 1L Floodplain Forest
D3 PUBH Type 5 Shallow Open Water
D4 PEMF Type 4 Deep Marsh
D5 PUBH Type 5 Shallow Open Water
D6 PSS1A Type 6 Shrub Swamp
D7 PEMB Type 2 Sedge Meadow
D8 PEMC Type 3 Shallow Marsh
D9 PFO1A Type 1L Floodplain Forest
D10 PEMC Type 3 Shallow Marsh
D11 PFO1A Type 1L Floodplain Forest
D12 PEMC Type 3 Shallow Marsh
D13 PEMC Type 3 Shallow Marsh
5.2.1 Bluff Creek
Bluff Creek is located within the project area, and flows from north to south along
Wetland S4, and the west side of Wetland S7. North of CSAH 61 Bluff Creek is
composed of a defined channel, with gabion walls on the west bank. The channel
north of the project area is located through a heavily wooded area with a closed
canopy. The channel bottom is composed of cobble and gravel. Bluff Creek passes
through a two-barrel box culverts, of which the eastern barrel is buried with sand and
is vegetated and is no longer used to convey flows outside of flood conditions. South
of CSAH 61 the channel is more natural with riffles and pools and gentle meanders.
Wetland Permit Application CARVR 119938
Carver County Page 11
Bluff Creek passes through additional culverts under the eastern lane of Highway 101
and into the Minnesota River floodplain, where it has scoured and has regular
maintenance concerns.
5.2.2 Minnesota River Floodplain
The Highway 101 crossing goes through extensive wetlands and floodplain associated
with the Minnesota River. This includes areas of shallow marsh, shallow open water,
wet meadow, and wooded floodplain. For the project area, the wetland is along the
toe of slope of the existing causeway crossing. A few areas have wider cross sections,
but the causeway is entirely composed of fill material.
6.0 Sequencing
6.1 Project Alternatives, Avoidance, and Minimization
Within the project purpose and need, design alternatives that would avoid and
minimize impacts were considered. Minimizing wetland impacts for the project
remains difficult due to the location of the wetlands adjacent to the roadways. Design
measures such as changes to the roadway profile, steeper slopes and minimized clear
zones have been implemented to help reduce the impact to the wetland.
Several alternatives were investigated (Appendix D- TH 101 “Wye” Feasibility
Study). These alternatives were primarily disregarded due to engineering issues, as the
majority of them impacted approximately the same amount of wetland.
6.1.1 No-build Alternative
The No-Build Alternate would involve no improvements being made and retains the
existing configuration of intersections within the project area. The No-Build Alternate
does not preclude ongoing maintenance work. The No-Build Alternate provides the
basis of comparison, or benchmark, for the Build Alternative and includes the impacts
associated with doing nothing.
The No-Build Alternative was not identified as the preferred alternative because it
fails to address the project purpose and need or satisfied the project goals and
objectives listed above.
6.1.2 CSAH 61 Alternative 1 – Design and Location Alternatives
Preliminary plans included the relocation of CSAH 61 to the north of the existing
alignment. This alternative would provides over 1,100 linear feet between the new
intersection and the TH 101 North intersection. This alternative would meet future
traffic demand, but included a need to grade into the bluff. These plans required
raising the elevation of the TH 101 north intersection approximately 8 feet.
Alternative 1 would have added acres of impacts to Wetlands S3, S4, S5/6 and D13,
and would reduce impacts to Wetland 1. Impacts associated with the roundabout
would be unchanged, as the route would continue to go through Wetland D11.
Alternative locations of the roundabout were also considered, but any adjustment from
the proposed location would result in additional impacts to wetlands D6 and D9
(Minnesota River, as opposed to depressional wetland). The loss of wetland D11 is
the greatest impact on the project, but the adjustment to Knowing that impacts to
Wetland D11 were unavoidable, it was determined to concentrate the impacts to one
Wetland Permit Application CARVR 119938
Carver County Page 12
area, and reduce the overall quantity of impacts to other, potentially higher quality,
wetlands.
Roundabouts have a larger footprint than traditional intersections, and because of this,
a smaller footprint alternative was considered. Because of the location of the
intersection in the middle of wetland D11, a traditional intersection would not reduce
impacts. This is in part due the extensive amount of souls correction involved, which
expands the construction limits past what would be considered discharge for the
roadway. Because of these factors, the roundabout was selected as it provided the
greatest safety improvement, and does not diminish the wetland impacts.
The alternatives of locating CSAH 61 further north, siting he roundabout in a different
location, and using a traditional intersection were all dismissed, as they all had greater
or no decrease in wetland impacts, required additional right of way, or had greater
cost.
6.1.3 Highway 101 Alternative 2 – Design and Location Alternatives
Highway 101 was considered for multiple construction and alignment alternatives.
Analysis of raising the causeway to a higher elevation was considered but quickly
dismissed, as it would have extensive wetland impacts, and would have caused an
increase in flood elevations. No quantify of impacts were calculated for this
alternative, but have been estimated to exceed 25 acres of wetland fill.
Alternative alignments to Highway 101 were also considered, but ultimately the
alignment that follows as close to existing would have the least amount of impact.
Construction alternatives were considered, and provided the greatest opportunity to
avoid and minimize wetland impacts. The original plans for the bridge construction
proposed to set the piers into constructed riprap islands. These islands would protect
the piers from scour and debris, but would have a considerable footprint of discharge
into wetland. Impacts from the island piers would have added between 5and 6 acres
of wetland impacts. The decision to go with unprotected bent piles, eliminate the
riprap, and reduced impacts to the Minnesota River floodplain to only 9,350 sf.
6.1.4 Alternative 3 – Preferred Alternative
The Preferred Alternative includes plans for a new bridge across the Minnesota River
to replace the existing Highway 101 causeway. Construction of the new bridge will
allow for the removal of the existing causeway (fill material) from the Minnesota
River 100-year floodplain area The new bridge will elevate the roadway
approximately 3 feet to 22 feet above the existing roadway, which will raise the
roadway above of the 100-year flood elevation and consequently minimize road
closures from flooding without increasing the 100-year flood elevation. The use of
unprotected bent piers significantly reduced impacts for the bridge portion of the
project. The removal of the causeway is also a major environmental improvement by
restoring the wetland, and reconnecting areas of Minnesota River floodplain.
The CSAH 61/Flying Cloud Drive roadway improvements include adding safety
through two new roundabout intersections at the Highway 101 “Wye” and Bluff Creek
Drive intersections. The existing high traffic volumes are also addressed by adding a
four-lane roadway section between the Highway 101 “Wye” intersection on the east
and Bluff Creek Road on the west. In addition, the CSAH 61/Flying Cloud Drive
Wetland Permit Application CARVR 119938
Carver County Page 13
improvements include a traffic signal at the Highway 101 (American
Boulevard)/Flying Cloud Drive intersection.
6.1.5 Summary of avoidance and minimization
Wetland impact avoidance and minimization has successfully been achieved with this
project. When the project was initially designed, before the design could be refined,
the impacts were estimated to be approximately 11.5 acres of lost wetland. By
locating CSAH 61 closer to the existing alignment, and reducing the extent of soils
corrections needed, the impact were reduced to approximately 7.5acres. The use of
bent pile piers for the new bridge further reduced impacts to the current 4.96 acres. In
total, impacts have been reduced by more than 50% through design refinements.
7.0 Wetland Impacts
The proposed project will result in the permanent loss of wetland habitat. Wetland
impacts will result from the direct placement of fill material into wetland habitat, and
convert the area into non-wetland. Additional impacts are the result of excavation to
incorporate those areas into storm water treatment features. In addition to wetland, the
project proposes to realign Bluff Creek, which is a MNDNR Public Water. The
construction of the new Highway 101 bridge will also impact Public Water, consisting
of Minnesota River backwater and floodplain areas. Wetland impacts are summarized
in Table 6.
Table 6 Wetland Impacts
Basin
ID
Cowardin
Classification
Circular 39
Classification
Eggers & Reed
Classification Impact Type
Wetland
Impacts
(acres)
S1 PEMB Type 2 Fresh (wet) Meadow Fill 0.44
S1 PEMB Type 2 Fresh (wet) Meadow Excavation 0.05
S2 PEMB Type 2 Fresh (wet) Meadow Fill 0.44
S3 PEMC Type 3 Shallow Marsh Fill 0.21
S5/S6 PEMB Type 2 Fresh (wet) Meadow Fill 0.66
S8 PEMC Type 3 Shallow Marsh Fill 0.01
S8 PEMC Type 3 Shallow Marsh Excavation 0.01
D11 PEMB/PEMC Type 2/3 Fresh (wet) Meadow,
Shallow Marsh Fill 1.99
D11 PEMB Type 2 Fresh (wet) Meadow Excavation 0.47
Bluff Creek PEMB Type 2 Fresh (wet) Meadow Realignment 0.47
Minnesota River
Crossing PEMC Type 3 Shallow Marsh Bent Piers 0.21
Total Impacts 4.96 acres
7.1 Bluff Creek Impacts
As part of the proposed action, the culverts under CSAH 61 and under TH 101 will be
removed and replaced with bridges. A new 36’ x 101’ bridge is proposed to be
constructed along CSAH 61/Flying Cloud Drive to allow Bluff Creek and a new
pedestrian trail to pass under the roadway. Construction of the proposed project
requires the removal of unsuitable organic material below the proposed roadway. The
Wetland Permit Application CARVR 119938
Carver County Page 14
removal extents of this project combined with the roadway footprint for the proposed
project result in the channel being impacted in its entirety.
The creek channel is also proposed to be relocated as part of the proposed roundabout
intersection design. Nearly 500 linear feet of the creek, located between CSAH 61 and
Highway 101 will be realigned as part of the project. The future channel will be
approximately 100 feet longer, and has been designed to meander to provide
additional habitat for wildlife and eliminate the current steep (2.3% slope) and
incorporate a natural channel bottom. The river banks of the realigned Bluff Creek
will be graded to allow for natural vegetation. The proposed stream design will no
decrease the length of the existing channel.
Benefits of the creek realignment include reestablishing a natural flow which has been
obstructed from the existing culverts. The resulting design will decrease overall flow
velocities at the roadway crossing. This will allow a more appropriate velocity for fish
passage. The stream bed and banks will be seeded using native vegetation mixes.
7.2 Pedestrian Trail Impacts
The project includes the construction of a trail, which will connect with existing
regional trail systems. The trail is located on the north side of CSAH 61, and will
share the bridge crossing of Bluff Creek. The trail will have wetland impacts of 0.08
acres. Impacts have been minimized by placing the trail within the area of the
construction limits that already has soils correction, which has already been
considered an impact for the roadway.
7.1 Wetland Re-establishment
Construction of the new bridge will allow for the removal of the existing causeway
(fill material) from the Minnesota River 100-year floodplain area. The removal of the
existing Highway 101 causeway across the Minnesota River floodplain area will have
a positive effect by allowing restoration of natural wetland/floodplain habitat to re-
establish. Approximately 427,983 ft2 (9.82 acres) are anticipated to re-establish natural
wetland/floodplain habitat through the removal of the exiting causeway. This cannot
be claimed as mitigation, but is a substantial environmental benefit.
8.0 Wetland Replacement Plan
Wetland replacement is proposed through the BWSR road program and Wetland
Banking. The replacement plan for the Southwest Reconnection Project is summarized
in Table 7. Descriptions of the plan are found in the following paragraphs.
Table 7 Summary of Wetland Replacement Plan by Bank Site
Impact Source
Mitigation Source
Wetland
Impacts (acres)
Wetland Mitigation
(acres) at 2:1 ratio
Roadway, bridge. and
storm water ponds BWSR Road Bank 4.88 9.76
Pedestrian trail German Settlement
Bank #1175 0.08 0.16
Totals 4.96 9.92
Wetland Permit Application CARVR 119938
Carver County Page 15
8.1.1 BWSR Road Program
The reconstruction of the Highway 61/101 Flood Mitigation project has been proposed
as a safety improvement. In addition to flood mitigation, the roadway and intersection
improvements along Carver County Road 61/Flying Cloud Drive will improve safety
and capacity based on existing traffic volumes.
On the basis that the project is proposed primarily for safety improvements, and the
project is being led by a local road authority (Carver County), it is proposed to
complete the compensatory mitigation requirements through the Board of Water and
Soil Resources road safety program.
The road components of the project propose to impact a total of 4.88 acres of wetland
habitat. This includes areas of both fill and excavation, and includes area of Public
Waters. It is proposed to provide mitigation at a 2:1 ratio, which would require the
withdrawal of 9.76 acres of wetland from the BWSR road program. It is requested
that BWSR identify the bank to be uses as part of this project review.
8.1.2 Wetland Banking
Additional impacts are anticipated due to the proposed pedestrian trail. These impacts
cannot be mitigated using the BWSR road bank and thus a mitigation plan is outlined
below.
Unavoidable impacts to wetlands will be replaced in accordance with the rules and
requirements of the USACE and the Minnesota WCA. The preferred method of
wetland replacement is by purchasing credits from an approved wetland bank.
The USACE rules require a base replacement ratio of 2.5:1 in Carver County for
wetland impacts, with incentives to reduce that ratio to a minimum of 2:1. Incentives
are offered if the wetland mitigation is provided “in kind,” with wetland replacement
being the same type as that impacted; “in place,” in the same wetland bank service
area; and “in advance,” or prior to the impacts from the proposed action. In Carver
County, the replacement ratio begins at 2.5:1 and decreases incrementally by 0.25:1
for each of the three incentives that are met with a minimum ratio of 2:1. In wetland
banking situations, the “in advance” requirement is met if the wetland credits are
purchased from an approved wetland bank.
WCA requirements stipulate a standard wetland replacement ratio of 2.5:1 for impacts
in a <50% area, 50-80% area, or non-agricultural land that are replaced outside the
BSA or County and a standard ratio of 2:1 when those impacts are replaced within the
same BSA or County.
SEH contacted several banks located in BSA #9 from the BWSR Available Wetland
Bank Credits Database.
Wetland credits from the Scott County wetland bank, German Settlement (No. 1175)
will be used for compensatory mitigation. Bank 1175 is located within is within BSA
#9 and major watershed #33-Minnesota (Shakopee), and has sufficient credits
available.
A replacement ratio of 2:1 will be applied for both the USACE and for the WCA. The
proposed replacement via wetland banking is considered “in advance” and “in place”
Wetland Permit Application CARVR 119938
Carver County Page 16
and qualifies for both of these two 0.25:1 reduction incentives under USACE
Mitigation Policy. The proposed wetland bank is within the same BSA as the impacts,
there therefore the required replacement under the WCA is also 2:1. To mitigate the
0.08 acres (3,593 sf) of wetland impact associated with the Proposed Action, a total of
0.16 acres (7187 sf) of wetland credit will be withdrawn from bank site No. 1175.
9.0 Permitting and Regulatory Jurisdiction
Wetlands in the project area are regulated by several agencies at the local, regional,
state, and federal levels including the USACE and the EPA at the federal level; the
Minnesota Board of Water and Soil Resources (BWSR), Minnesota Department of
Natural Resources, and the Minnesota Pollution Control Agency (MPCA) at the state
level; the Carver County Soil and Water Conservation District at the regional level;
and Carver County at the local level. The City of Chanhassen has accepted the
responsibility for the administration of the Minnesota Wetland Conservation Act
(WCA) of 1991, on the basis that the majority of impacts are within the city limits.
Specific permit actions are described below.
9.1 U.S. Army Corps of Engineers
All of the wetlands in the project area are under the jurisdiction of the U.S. Army
Corps of Engineers, and a Preliminary Jurisdictional Determination would be
accepted.
This permit application is a request for a Letter of Permission, and acceptance of the
use of the BWSR bank for wetland replacement related to the roadway safety
improvements. It is requested that the use of the German Settlement Bank be allowed
for impacts associated with the pedestrian trail. Mitigation is proposed at a 2:1 ratio
for all aspects of the project.
All of the 4.96 acres of impacts are regulated by the USACE.
It is requested that 401 Water Quality Certification be completed in conjunction with
this review, and that waiver of LOP projects be considered. In anticipation of this, a
copy of this application has not been provided to the Minnesota Pollution Control
Agency.
9.2 Wetland Conservation Act – City of Chanhassen
The City of Chanhassen is responsible for administration of the WCA in the project
area. The project is eligible for Replacement Plan Approval under the Minnesota
Wetland Conservation Act for impacts to wetland within the project area.
Of the 4.96 acres of impacts, the WCA only regulates those that are not also MNDNR
Public Waters. The impacts to Bluff Creek (0.47 acres) and the Minnesota River (0.21
acres) are not under the jurisdiction of the WCA. Therefore, the impacts under the
WCA are 4.28 acres.
This permit application is a request for Replacement Plan Approval under the rules
of the Minnesota Wetland Conservation Act of 1991. A copy of the Minnesota
Local/State/Federal Application Form for Water/Wetland Projects is included at the
beginning of this document.
Wetland Permit Application CARVR 119938
Carver County Page 17
Compensatory mitigation for wetland impacts is proposed through withdrawal of 9.76
acres of credits from the BWSR transportation bank and 0.16 acres from wetland bank
No. 1175. The request for replacement exceeds the WCA requirements, as it includes
mitigation for lost areas of Public Water. This is consistent for the BWSR to provide
mitigation for all impacts related to a project, not just those under the jurisdiction of
the WCA.
9.3 Minnesota Department of Natural Resources
The MNDNR is responsible for all public waters and public waters wetlands in the
project area. This permit application describes project activities with Bluff Creek
(realignment) and the Minnesota River (bent piers for new bridge).
An existing 421 feet of Bluff Creek, with an area of 0.47 acres, will be relocated to
create a new channel. The new channel will be 529 feet, and will also replace two
culver crossings with bridges. Although the net area of Bluff Creek will increase, the
loss of the existing channel is proposed for replacement via the BWSR road bank.
This is consistent with past projects of a similar impact.
The placement of bent piles in the Minnesota River floodplain (Public Waters 10-
221W and 27-132P, Rice Lake) is also considered an impact, although it is a structural
discharge. The area of the bent piles is estimated to be a total of 0.21 acres
(9,350 sf),based on an estimate of 374 piles within wetland, and an average area of 25
square feet for each structure. Mitigation is proposed for these impacts, as they are
permanent.
It is requested that although it is not eligible for use as mitigation, that the restoration
of the former causeway, and the addition of 9.82 acres of Public Water Wetland be
considered in the overall review of this project.
This permit application is a request for permission to work in the bed of Bluff Creek,
Public Water 132P, and Public Water Wetland 10-221W. A copy of the Minnesota
Local/State/Federal Application Form for Waters/Wetlands Projects is included at the
beginning of this document. An electronic submittal has also been made through
MPARS.
10.0 Supplemental Information
In addition to the wetland components, the project has been reviewed for a variety of
ancillary topics. These are discussed below.
10.1 U.S. Fish and Wildlife and MNDNR Property
The large portion of the project area lies adjacent to wildlife management areas; US
Fish and Wildlife Service (FWS) MN Valley National Wildlife Refuge and the DNR
Raquet Wildlife Management Area (WMA). The portion of the project area that
crosses the Minnesota River floodplain as had no previous development except for the
construction of Highway 101. The floodplain habitat found adjacent to the highway
corridor primarily consists of forested wetlands and grasslands. Along Carver CSAH
61 (Flying Cloud Drive), there are scattered private parcels with recent land
disturbances that can be characterized as more rural commercial and residential
development
Wetland Permit Application CARVR 119938
Carver County Page 18
Construction of the proposed project will be staged such that the project will not
occupy either temporarily (during construction) or permanently within the US FWS
Minnesota River Valley National Wildlife Refuge property. Since the eastern
boundary of the designated Raquet WMA abuts the existing Highway 101 causeway
across the Minnesota River floodplain area, a narrow strip of the WMA will be
affected by the construction of the new bridge. Furthermore, a small permanent right-
of-way will be needed from the MNDNR on a parcel of property owned by the
MNDNR near the north end of the proposed bridge. A land transfer between the
MnDNR and MnDOT has been previously discussed and since Highway 101 will be
turned back to Carver and Scott Counties a local jurisdictional transfer of the roadway
and right-of-way is planned to occur
10.2 State Threatened and Endangered Species
The Minnesota NHIS has been queried to determine if any rare plant or animal
species, native plant communities, or other significant natural features are known to
occur within an approximate one-mile radius of the project area. Based on this query,
rare features have been documented within the search area. The Minnesota River
contains several types of rare species (fish and native mussel species). A restoration of
the floodway should ultimately provide aspects for their benefit; precautions should be
taken not to cause adverse impact during construction. With appropriate sediment
control measures during construction, the MNDNR does not believe the project will
negatively affect any known occurrences of rare features.
A Scientific and Natural Area (SNA), is located a short distance southwest from the
immediate Southwest Reconnection Project study area. The SNA includes a rare
calcareous fen (known as the Seminary Fen) with threatened plant species. According
to the MNDNR, the establishment of a SNA is intended to preserve and perpetuate the
ecological diversity of Minnesota's natural heritage, including landforms, fossil
remains, plant and animal communities, rare and endangered species, or other biotic
features and geological formations, for scientific study and public edification as
components of a healthy environment. Continued coordination with the MNDNR and
LMRWD will occur to ensure no impacts occur to the Seminary Fen as a result of the
proposed improvements.
10.3 Storm Water Treatment
In accordance with the requirements of the NPDES permit, the roadway design will
include storm water treatment BMPs that will be designed and built to comply with
the NPDES Construction Stormwater permit requirements (in effect prior to August
2013), Lower Minnesota River Watershed District (LMRWD) volume control
standards and City of Chanhassen storm water design standards. The project includes
two planned filtration basins and two wet detention ponds to treat runoff from the
local roadway, bridge and intersection improvements.
10.4 Archeological Resources
The proposed project was reviewed for archaeological, historical, and architectural
resources. No historic structures eligible for listing on the National Register of
Historic Places (NRHP) were identified in the study area. However, Phase 1 and Phase
2 investigations were completed for several potentially eligible archaeological sites.
Background research was conducted at the Minnesota State Historic Preservation
Office and Minnesota History Center Library prior to field surveys. Research
Wetland Permit Application CARVR 119938
Carver County Page 19
included a review of previously recorded sites, historic plat maps, and historic
accounts of Native American sites along the Minnesota River near Shakopee. No
sites were recorded in the project area from these sources. Below is a summary of
field investigations for four sites that could be impacted by the proposed roadway
improvements.
Site 21CR154 - This site is a precontact habitation that consists of a sparse amount of
lithic debris, fire-cracked rocks, and animal bone. Site activities are inferred to
include animal processing, cooking, and lithic reduction. The portion of the site within
the existing road right-of-way was evaluated and was recommended not eligible for
listing on the NRHP. A small portion of the site was surveyed outside of the road
right-of-way, and this portion of the site is recommended for further Phase 2
investigations. In summary, a total of 31 deep auger tests were dug in five and ten-
meter intervals at the site, with only seven tests containing artifacts. Artifacts were
recovered from 0 to 80 cm below surface. Two (1 x 1 meter) excavation units were
also dug, but neither unit contained artifacts.
Site 21CR155 - This site is an early Archaic or Late Paleoindian habitation that
consists of a moderate amount of lithic debris, stone tools, fire-cracked rocks, and
butchered and calcined (burned) animal bone (bison or elk). Site activities are inferred
to include animal processing, cooking, lithic reduction, and stone tool production. A
total of 42 deep auger tests were dug in five and ten-meter intervals, with30 tests
containing artifacts. Seven (1 x 1 meter) excavation units were also dug. Artifacts
were recovered from 100 to 240 cm below surface, with most recovered from a buried
soil between 220 and 240 cm. Lithic materials include Knife River Flint and Hixton
Quartzite that derive from western North Dakota and west-central Wisconsin.
Radiocarbon dating was performed on the animal bone (bison or elk) and provided a
conventional date of 7160 BP1 (+/-30), with a 2 Sigma Calibration of 8020 to 7940
BP. The evaluation results indicate that the site has the potential to provide important
information on the precontact period because of the site’s research potential and the
well-preserved cultural deposits that have integrity. The site is recommended eligible
for listing on the NRHP, and a Phase 3 data recovery is recommended if the site can’t
be avoided.
Site 21CR156 – This site is a precontact habitation that consists of a moderate amount
of Late Woodland ceramics, lithic debris, stone tools, and animal bone. Site activities
are inferred to include animal processing, cooking, lithic reduction, and stone tool
production. A total of 50 deep auger tests were dug in five-meter intervals, with 35
tests containing artifacts. Artifacts were recovered from 20 to 240 cm below surface.
Eight (1 x 1 meter) excavation units were also dug. The site contains stratified Late
Woodland, Archaic, and Late Paleoindian components. Radiocarbon dating was
conducted on calcined/burned turtle bone, which provided a conventional date of 7040
+/- 30 BP, with a 2 Sigma Calibration of 7940 to 7830 BP. The evaluation results
indicate that the site has the potential to provide important information on the
precontact period because of the site’s research potential and the well-preserved
cultural deposits that have integrity. The site is recommended eligible for listing on the
1 Before Present (BP) years is a time scale used in archaeology, geology, and other scientific disciplines to specify when
events in the past occurred. Because the "present" time changes, standard practice is to use 1 January 1950 as the origin of the
age scale, reflecting the fact that radiocarbon dating became practicable in the 1950s.
Wetland Permit Application CARVR 119938
Carver County Page 20
NRHP. The site will be avoided since it has been determined that the site is located
outside the construction limits of the Southwest Reconnection Project.
Site 21CR157 - This site is a precontact habitation that consists of lithic debris, fire-
cracked rock, and animal bone. Site activities are inferred to include animal
processing, cooking, and lithic reduction. The site is buried below modern fill, and
three tests contained artifacts from 130 to 300 cm below surface. The site is
recommended for further Phase 2 investigations.
Since the project will require a US Army Corps of Engineers (USACE) wetland
permit, it is following the federal Section 106 process. Carver County has coordinated
with USACE and the MnDOT Cultural Resources Unit on the required tribal
consultation and will be developing a Memorandum of Agreement (MOA) that will
detail the process for mitigating impacted archaeological sites.
List of Figures
Figure 1 – Site Location and Topographic Map
Figure 2 – Aerial Photograph (2012)
Figure 3 – MNDNR Public Waters Inventory
Figure 4 – National Wetlands Inventory
Figure 5 – Soil Survey for Carver and Scott Counties
Figure 6 – Wetland Impacts
Figure 6-1- Wetland Impacts – West Side CSAH 61
Figure 6-2 – Wetland Impacts – West Side CSAH 61
Figure 6-3 - Wetland Impacts – Highway 101
This Page Left Blank Intentionally
Site Location and Topographic MapProject: CARVR 119938
Figure
1
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (888) 908-8166
TF: (800) 325-2055
www.sehinc.com
Map by: RB/BPT
Projection: UTM NAD83 15N
Source: MnDOT, SEHInc
Background: USGS 24k Topo
Print Date: 7/18/2013)
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic
Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this
map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
Minnesota River Flood Plain Bridge Replacement and Improvements
Carver & Scott Counties, Minnesota
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EXPLANATION
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ffCreekDr
UV69
Project: CARVR 119938
Figure
2
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (888) 908-8166
TF: (800) 325-2055
www.sehinc.com
Map by: RB/BPT
Projection: UTM NAD83 15N
Source: MnDOT, SEHInc
Background: MnDNR 2012
Print Date: 7/18/2013)
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic
Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this
map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
TH 101 / CSAH 61 Road Improvements
Carver & Scott Counties, Minnesota
±
05001,0001,500
Feet
EXPLANATION
Area of Investigation
Th
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MNDNR Public Waters Inventory
A s s u m pt i o n C re e k
Assu
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ption
C
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ek
M i n n e s o t a R i v e r Minnesota River M i n ne s o t a R i v e r
Bl
uff C r eekUnnamed10-220 W
Unnamed10-221 WUnnamed10-222 W
Unnamed10-223 W
Rice27-132 P
Strunks70-116 P
UV61
UV61?A101
KL212
UV69
UV101
Project: CARVR 119938
Figure
3
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (888) 908-8166
TF: (800) 325-2055
www.sehinc.com
Map by: RB/BPT
Projection: UTM NAD83 15N
Source: MnDOT, SEHInc
Background: MnDNR 2012
Print Date: 1/27/2014)
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic
Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this
map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
TH 101 / CSAH 61 Road Improvements
Carver & Scott Counties, Minnesota
±05001,0001,500
Feet
EXPLANATION
Area of Investigation
PWI Watercourses
PWI Basins
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National Wetlands Inventory
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L1UBH
PE M C
P E M F
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P E M C
PEMC
P E M Bd
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PSS/F O 1 C
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PFO/S
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PEMA
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P E M F
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PFO1C
P F O 1 A
PEMAPFO1C
PEMCPEMCPUBG
PFO1A
PFO1CPEM/SS1Bd
PUBGx
PFO1C
PFO1C PFO1/EMCPSS1C
PFO1A
PFO1CPEMCPSS/FO1C
PSS/FO1C PEMC
PFO/SS1C
PFO1CPFO1C PEMC
PEMC PSS1CPEMC
PSS/FO1C
PEMC
PEMCdPEMAPUBF
PEMC
?A101
UV61
UV61
UV69
UV101
Project: CARVR 119938
Figure
4
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (888) 908-8166
TF: (800) 325-2055
www.sehinc.com
Map by: RB/BPT
Projection: UTM NAD83 15N
Source: MnDOT, SEHInc, USFWS
Background: MnDNR 2012
Print Date: 7/18/2013)
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic
Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this
map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
TH 101 / CSAH 61 Road Improvements
Carver & Scott Counties, Minnesota
±05001,0001,500
Feet
EXPLANATION
Area of Investigation
NWI Legend
Type 1 - Seasonal
Type 2 - Wet Meadow
Type 3 - Shallow Marsh
Type 4 - Deep Marsh
Type 5 - Shallow Open Water
Type 6 - Scrub Shrub
Type 7 - Forested
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Soil Survey for Carver and Scott Counties
CarverScott
KD2
BH
W
KC2KC2
KC2 KE2 MN MNAE
HD
TC
YE
MN
YD
TB
MN
TC
MN
MN
KM
TB
EBCH
EB
MN
MN
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KM
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KF
KFKFKF
KF KL
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AaA
Oa IN
T INT
Dd
Dc
AaB
AaA
A
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A
Oa
Dd
AaB
AaA ScAbAb
Project: CARVR 119938
Figure
5
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (888) 908-8166
TF: (800) 325-2055
www.sehinc.com
Map by: RB/BPT
Projection: UTM NAD83 15N
Source: MnDOT, SEHInc, NRCS
Background: MnDNR 2012
Print Date: 7/18/2013)
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic
Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this
map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
TH 101 / CSAH 61 Road Improvements
Carver & Scott Counties, Minnesota
±
05001,0001,500
Feet
EXPLANATION
Area of Investigation
SSURGO Hydric Rating
All hydric
Partially hydric
Unknown (water)
Not hydric
SymbolMap Unit Name SymbolMap Unit Name
AEHawick loamy sand, 18 to 40 percent slopes TBTerril loam, 0 to 6 percent slopes
BHBlue Earth mucky silt loam TCTerril loam, 6 to 12 percent slopes
CHChaska loam, occasionally flooded WWater
EBEstherville sandy loam, 2 to 6 percent slopes YDRasset-Lester-Kilkenny complex, 12 to 18 percent slopes
HDEstherville-Hawick sandy loams, 12 to 18 percent slopesYERasset-Lester-Kilkenny complex, 18 to 25 percent slopes
KCLester-Kilkenny loams, 6 to 12 percent slopes AaAAlluvial land, 0 to 2 percent slopes
KC2Lester-Kilkenny loams, 6 to 12 percent slopes, erodedAaBAlluvial land, 2 to 6 percent slopes
KD2Lester-Kilkenny loams, 12 to 18 percent slopes, erodedAbAlluvial land, frequent overflow, 0 to 6 percent slopes
KE2Lester-Kilkenny loams, 18 to 25 percent slopes, erodedDcDorchester loam and silt loam
KFLester-Kilkenny loams, 25 to 40 percent slopes DdDorchester silty clay loam
KLHanlon-Kalmarville complex, frequently flooded INTWater, intermittent
KMMinneiska-Kalmarville complex, frequently flooded OaOshawa silty clay loam
MNMinneiska loam ScStony land
OSOshawa silty clay loam
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3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (651) 490-2150
WATTS: 800-325-2055
www.sehinc.com
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Wetland Impacts - Overall Project Figure
6
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
Project: CARVR 119938
Print Date: 12/20/2013
Map by: drd
Projection: UTM NAD 83
Source: LMIC TH 61 and CSAH 101 Roadway Improvements
Carver and Scott Counties, Minnesota
West Half CSAH 61
1.11 acres of fill
0.05 acres of excavation
1.16 acres total impact
TH 101 Bridge Crossing
374 bent piers within wetland
0.21 acres wetland fill
³
1,000
Feet
Wetland ImpactsImpact Type
Fill
Excavation
Bluff Creek
Construction Limits
East Half CSAH 61
2.66 acres of fill
0.52 acres of excavation
0.47 acres within Bluff Creek
3.65 acres total impact
TH 101 Bridge Crossing
Removal of causeway
9.82 acres of wetland restored
Total Impacts:
3.76 acres wetland fill
0.52 acres wetland excavation
0.47 acres to Bluff Creek
0.21 to Minnesota River floodplain
Total: 4.96 acres
Total Restoration:
9.82 acres restored Minnesota River floodplain
This Page Left Blank Intentionally
Wetland 20.36 Acres Fill
Wetland 30.21 Acres Fill
Wetland 20.08 Acres Fill
Wetland 10.44 Acres FillWetland 10.05 Acres Excavation
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (651) 490-2150
WATTS: 800-325-2055
www.sehinc.com
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Wetland Impacts Figure
6-1
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
Project: CARVR 119938
Print Date: 12/20/2013
Map by: drd
Projection: UTM NAD 83
Source: LMIC TH 61 and CSAH 101 Roadway Improvements
Carver and Scott Counties, Minnesota
³
100
Feet
Wetland ImpactsImpact Type
Fill
Excavation
Purgatory Creek
Construction Plans
Roadway Features
Trail; Trail Features
Storm Water Features
Construction Limits
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Bluff Creek0.47 Acres Fill
Wetland 50.44 Acres Fill
Wetland 111.99 Acres Fill
Wetland 50.15 Acres Fill
Wetland 110.47 Acres Excavation
Wetland 50.01 Acres Fill
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (651) 490-2150
WATTS: 800-325-2055
www.sehinc.com
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Wetland Impacts Figure
6-2
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
Project: CARVR 119938
Print Date: 12/20/2013
Map by: drd
Projection: UTM NAD 83
Source: LMIC TH 61 and CSAH 101 Roadway Improvements
Carver and Scott Counties, Minnesota
³
100
Feet
Wetland Impacts
Impact Type
Fill
Excavation
Bluff Creek
Construction Plans
Roadway Features
Trail; Trail Features
Storm Water Features
Construction Limits
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Wetland ImpactsProject: CARVR 119938
Figure
6-3
3535 VADNAIS CENTER DR.
ST. PAUL, MN 55110
PHONE: (651) 490-2000
FAX: (888) 908-8166
TF: (800) 325-2055
www.sehinc.com
TH 61 and CSAH 101 Roadway ImprovementsMap by: drd
Projection: UTM NAD 83
Source: LMIC
Print Date: 1/27/2014
Carver and Scott Counties, Minnesota
This map is neither a legally recorded map nor a survey map and is not intended to be used as one. This map is a compilation of records, information, and data gathered from various sources listed on this map and is to be used for reference purposes only. SEH does not warrant that the Geographic
Information System (GIS) Data used to prepare this map are error free, and SEH 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. The user of this
map acknowledges that SEH shall not be liable for any damages which arise out of the user's access or use of data provided.
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Minnesota River0.21 Acres FIll
374 Bent Piles25 sf per pileTotal Impacts: 9,350 sf pile impacts
Existing Causeway to be removed
9.82 Acres Restored
Wetland Impacts
Impact Type
Fill
Excavation
Purgatory Creek
Construction Plans
Roadway Features
Trail; Trail Features
Storm Water Features
Construction Limits 400
Feet
This Page Left Blank Intentionally
Wetland Permit Application CARVR 119938
Carver County Page 22
Appendix A
Project Plan Sheets
This Page Left Blank Intentionally
The TH 101 Project Plan Sheets are located on the attached CD at the end of this document.
This Page Left Blank Intentionally
Wetland Permit Application CARVR 119938
Carver County Page 23
Appendix B
Wetland Delineation Report
This Page Left Blank Intentionally
The TH 101 Wetland Delineation Report is located on the attached CD at the end of this document.
This Page Left Blank Intentionally
Wetland Permit Application CARVR 119938
Carver County Page 24
Appendix C
TH 101 “Wye” Feasibility Study
This Page Left Blank Intentionally
The TH 101 “Wye” Feasibility Study is located on the attached CD at the end of this document.
This Page Left Blank Intentionally
Appendix D
Combined Wetland Application Forms
This Page Left Blank Intentionally
Appendix E
Wetland Banking Forms
This Page Left Blank Intentionally
This Page Left Blank Intentionally
Application for Withdrawal of Wetland Credits
from the Minnesota Wetland Bank
BWSR Application for Withdrawal of Wetland Credits Form Rev 10/3/2013
Page 2 of 2
4. Withdrawal Information To be completed by seller of credits (account holder).
Bank Service Area: 9 Account Number: 1175 County: Scott
Credit Subgroup
Letter Plant Community Type Cost per Credit
(acre)
Number of Credits to
be Withdrawn (acre)
(acre=ft2/43560)
Cost of Purchased
Credits
(cost per credit x number of credits)
B Tributary $43560.00 0.1650 $7187.40
$0.00
$0.00
$0.00
TOTAL 0.1650 $7187.40
Table: www.bwsr.state.mn.us/wetlands/2013_Fee_Schedule.pdf
Enter County Fee
from Table (county of
seller’s bank)
6.5% of sale price
2995.00
Transaction Fee (choose either amount)
Above TOTAL x
County Fee
$ 494.18
$ 467.18
Attach check payable to Minnesota Board of Water and Soil Resources.
By signature below I seller and holder of the aforementioned account in the State of Minnesota Wetland Mitigation Bank certify that:
1) The credits described in this application have been sold to the credit user or will be used for my own project;
2) I have received payment in full from the buyer (if applicable);
3) The credits described in this application have not been sold or used in any way to mitigate wetland losses other than for the project
and location identified in the wetland impact information block on the previous page;
4) The credits described in this application should be withdrawn from my account; and
5) I will not have a negative balance of credits after the subject credits are debited from my account
Seller Name (print):
Seller Signature: Date: ____________
Seller e-mail*:
1. The account holder of the credits is responsible for submittal of this form, containing signatures, to the BWSR Wetland Bank
Administrator so the affected account can be properly debited.
2. No impacts to any wetland or other water resource may commence until the credits have been debited and a copy of this form
with stamped debit date has been received by the regulatory authority(ies), the account holder, and the credit user.
When this form is completed and all required signatures are obtained, send with the fee check to:
Wetland Bank Administration
Minnesota Board of Water and Soil Resources
520 Lafayette Road North
Saint Paul, MN 55155