3 Lake Riley/Rice marsh Lake Water Quality Improvement Proj.
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone 952.227.1100
Fax 952.227.1110
Building Inspections
Phone 952.227.1180
Fax 952.227.1190
Engineering
Phone 952.227.1160
Fax 952.227.1170
Finance
Phone 952.227.1140
Fax 952.227.1110
Park & Recreation
Phone 952.227.1120
Fax 952.227.1110
Recreation Center
2310 Coulter Boulevard
Phone 952.227.1400
Fax 952.227.1404
Planning &
Natural Resources
Phone 952.227.1130
Fax 952.227.1110
Public Works
1591 Park Road
Phone 952.227.1300
Fax 952.227.1310
Senior Center
Phone 952.227.1125
Fax 952.227.1110
Web Site
www.ci.chanhassen.mn.us
8
MEMORANDUM
TO:
Park and Recreation Commission
Todd Hoffman, Park & Recreation Director-4
FROM:
DA TE:
February 14, 2006
SUBJ:
Lake Riley/Rice Marsh Lake Water Quality Improvement
Project; Riley-Purgatory-Bluff Creek Watershed District
The Riley-Purgatory-Bluff Creek Watershed District is sponsoring the Lake
Riley/Rice Marsh Lake Water Quality Improvement Project. The District was
established by the Minnesota Water Resources Board in 1969, acting under
authority of the Watershed Law. The District is governed by a five member
board with one manager being appointed by the Carver County Commissioners
and the other four by the Hennepin County Commissioners.
The District works with various government bodies to help regulate storm water
run-off, improve water quality, and provide recreation. This project will
significantly improve five separate storm water basins in the City of Chanhassen,
three of which lie wholly within the borders of Rice Marsh Lake Park.
Attached is a copy of a letter from Robert Obermeyer, the District's consulting
engineer, dated January 27, 2006, and addressed to Lori Haak, Water Resources
Coordinator for the City of Chanhassen. Mr. Obermeyer's letter introduces the
construction documents, speaks to the construction timeline, and solicits
comments about the project. Selected staff members met on February 2, 2006,
to review the District's proposal. Upon conclusion of our meeting, Ms. Haak
forwarded the following comments to the District's Engineer.
. All neighbors in the immediate vicinity of the projects (especially the three
ponds adjacent to Rice Marsh Lake) should be notified of the project via
U.S. mail.
. The restoration of trails damaged by the construction activity should be
included as part of the bid package.
. Trail closures should be thoroughly reviewed and addressed as necessary.
. The proposed timing of the projects (which projects get constructed when)
should be conveyed to the City and the project neighbors.
. The Market Boulevard pond is a highly visible site with high traffic volumes
(pedestrian and vehicular) on Market Boulevard. Keeping the truck drivers
alert and the streets free of tracked dirt and mud are certainly important for
all the projects, but will be even more essential in this location.
The City of Chanhassen . A growing community with clean lakes, Quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play.
Park & Recreation Commission
February 14, 2006
Page 2
In a follow up conversation with Mr. Obermeyer, it was ascertained that the
District has already addressed the majority of these issues. In regard to the
neighborhood communication request, it has been agreed that the City will
provide mailing labels to the District. The District will in turn mail the
appropriate notification letters. Trail closures will be coordinated with the
District and contractor with appropriate on-site notifications being posted.
Staff is pleased that the District is sponsoring these important water quality
projects within the City. This report is intended to raise your awareness to the
projects. Your comments, questions and/or recommendations will be forwarded
to the city's Water Resources Coordinator for inclusion in her report to the City
Council.
ATTACHMENT
1. Letter from Robert Obermeyer, Riley Purgatory Bluff Creek Watershed
District Consulting Engineer
2. Introduction to Riley Purgatory Bluff Creek Watershed District
3. Project Description
4. Project Plans
Barr Engineering Company
4700 West 77th Street . Minneapolis. MN 55435-4803
Phone: 952-832-2600 . Fax: 952-832-2601 . www.barr.com
An EEO Employer
BARR
Minneapolis, MN . Hibbing, MN . Duluth, MN . Ann Arbor, MI . Jefferson City, MO
January 27, 2006
Ms. Lori Haak
City of Chanhassen
7700 Market Boulevard
P.O. Box 147
Chanhassen, MN 55317
Re: Lake Riley/Rice Marsh Lake Water Quality Improvement Project
Dear Ms. Haak:
Enclosed for your review and comment is a set of construction documents for the Lake Riley/Rice
Marsh Lake Water Quality Improvement Project. It is my intention to proceed with the bidding
process as soon as possible with the construction schedule being weather dependent. I would
anticipate that the upper basins could be constructed yet this construction season but the basins
within Rice Marsh Lake likely will not be constructed until the 2006-2007 winter months.
If you have any questions, please give me a call at 952-832-2857.
bert . Obermeyer
Barr Engineering Comp n~
Engineers for the District
C: Board of Managers
Paul Haik
Riley Purgatory Bluff Creek Watershed District: General
Page 1 of 2
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.,.
http://www.rileypurgatorybluffcreek.org/general.htm
Riley Purgatory Bluff Creek"
Watershed District r&
General
What does the RPBC Watershed do?
The RPBCWD works with other government bodies to
regulate stormwater runoff, improve water quality, and
provide recreation. The District also works with
developers on any project that proposes to alter
floodplains, wetlands or streams.
The RPBCWD requires permits for such projects to ensure
that land use changes do not negatively impact water
quality and flood protection. District review of permits
provides an opportunity for citizen input on water related
issues.
The District has worked with municipalities to construct
water quality and flood control projects such as the Chain
of Lakes and the Purgatory Recreation Area Staring Lake
Outlet.
With the newly approved Water Management Plan, the
District now may pursue projects that improve water
quality. These projects, like past flood control projects,
will be conducted in full cooperation with municipalities.
How is the RPBCWD governed?
A five member Board of Managers governs the RPBCWD.
One is appointed by the Carver County Commission, the
other four by the Hennepin County Commission. Each
serves a three year term.
Vice President
Conrad Fiskness
8033 Cheyenne Ave.
Chanhassen, MN 55317
952-934-5581
Term expires: 7/30/06
Manager
Mark Dillon
3411 Fairlawn Drive
Minnetonka, MN 55345
952-476-2709
Term expires: 7/30/08
Treasurer
Philip Wright
9484 Painters Ridge
Eden Prairie, MN 55347
952-942-0424
Manager
Erin Ahola
19080 Broadmoore Drive
Eden Prairie, MN 55346
952-934-5449
2/1012006
Riley Purgatory Bluff Creek Watershed District: General
Page 2 of 2
Term expires: 07/30/07
Term expires: 7/30/08
Secretary
Howard L. Peterson
7021 Duck Lake Road,
Eden Prairie, MN 55346,
952-934-2050.
Term expires: 7/30/06
Manager
Michael J. Casanova
18559 Kristie Lane
Eden Prairie, MN 55346
952-937-2322
A Citizens' Advisory Committee meets the first Tuesday of
every month to advise the Board of Managers on citizen
concerns relative to water issues. For more information,
contact:
Jennifer Olim, Chair
(W) 952-949-6768
John Howe, Vice Chair
(H) 952-975-0953 (W) 952-595-8888
view meeting schedule
If you have any questions, or difficulties, using this website
please call 952-832-2862.
h Up:/ /www.rileypurgatorybluffcreek.org/general.htm
2/10/2006
,......
Riley-Purgatory-Bluff Creek Watershed District's
Lake Riley and Rice Marsh Lake: Water Quality
Improvement Project Wetland Replacement Plan
,...,
Prepared for
the City of Chanhassen,
the City of Eden Prairie,
The Riley-Purgatory-Bluff Creek Watershed District
February 2006
,...,
BARR
4700 West 77th Street
Minneapolis, MN 55435
Phone: (952) 832-2600
Fax: (952) 832-2601
,....
Riley-Purgatory-Bluff Creek Watershed District's Lake Riley and
Rice Marsh Lake: Water Quality Improvement Project Wetland
Replacement Plan
Table of Contents
1.0 Introduction ........... ........ ...... .......................... ........ ........... ... ....... ........... .................. ....... ........... ....... ......1
2.0 Background........................................................................................................................... .................3
3.0 Proj ect Description........................................................................................................................... ......5
3.1 Project Need .. .... ....................................... ............................. ............... ........ ......... ..... .................5
3.2 Proj ect Plan ....... ... ... ..... .................................... ........ ................ .......... ........................ ..... ..... ....... 7
3.2.1 Rice Marsh Lake ......... .............. ........... ....... ...... ....... ........ ..... .... ............... ........... ...........7
4.0 Sequencing Analysis............................................................................................................................ ..8
4.1 No Build Alternative.. ......... .... ................................... ..... ...... ........ .................. ........... ............ ..... 8
4.2 Wetland Avoidance Alternative ............. ............ ....... ............ ........ .......... ........... ............. ............ 8
4.3 Proposed Alternative................................................................................................................... 9
5.0 General Environmental Setting ................ .............. ................. ...... ..................... ...................... ..... .......12
,..... 6.0 Wetland Delineation....... ..... ... ......... ...... ................... ........................... ........... .... .... ......... ...... ... ........ ....13
6.1 Wetland Delineation and Classification Methods .....................................................................13
6.2 Wetland Descriptions ...... .................................. ............ ................ ...... ............. ......... ...... ...... ... .14
7 .0 Wetland Impacts and Mitigation.. ......... ................... ............... ...... ................................ ..... ........... .......20
8.0 Post-Construction Maintenance and Inspection ... ....... ................... .......... ....... ....... .............. ..... ........ ...23
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i
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1.0 Introduction
On behalf of the City of Chanhassen, the City of Eden Prairie, and the Riley-Purgatory-Bluff Creek
Watershed District (District), Barr Engineering Company is submitting a Wetland Replacement Plan
Application for the alteration of existing stormwater management basins and conveyance systems in
Chanhassen, Minnesota and the expansion of an existing stormwater management basin into the City
of Eden Prairie. The Riley-Purgatory-Bluff Creek Watershed District's Lake Riley and Rice Marsh
Lake: Water Quality Improvement Project was recommended in the May 2004 Engineer's Report
Lake Riley Water Quality Improvement Project and is the outcome of Use Attainability Analyses
(UAAs) prescribed by the J 996 Riley-Purgatory-Bluff Creek Watershed District Water Management
Plan. The recommended improvements for Lake Riley and Rice Marsh Lake are based on historical
water quality data, the results of an intensive 1997 through 1998 lake and watershed runoff water
quality monitoring program, and computer simulations of watershed runoff, calibrated to the 1997
through 1998 data set. Computer simulations estimated watershed runoff under existing and
proposed future land use conditions and under varying climatic conditions. Maintaining the quality
of Lake Riley and Rice Marsh Lake is important to the cities of Chanhassen, Eden Prairie, and the
'" District and improvements to the existing stormwater treatment system in a cost-effective manner is
needed to sustain existing water quality levels. Existing stormwater management basins within the
watershed to Lake Riley and Rice Marsh Lake are inadequate to meet water quality management goals
of the District.
The project site is located in Township 116 and parts of: Section 13, Range 23 (Carver County); the
southeast quarter of Section 12 (Carver County) and the southwest quarter of Section 7, Range 23
(Hennepin County); Section 18, Range 22 (Hennepin County); and Section 23, Range 23 (Carver County),
Minnesota as shown in Figure 1. This Riley-Purgatory-Bluff Creek Watershed District UAA: Water
Quality Improvement Project Replacement Plan (plan) has been prepared in accordance with the
requirements of the 1991 Wetland Conservation Act (WCA) as administered by the city of Chanhassen and
Section 404 of the Clean Water Act administered by the U.S. Army Corps of Engineers (Corps). The
Minnesota Department of Natural Resources (MnDNR) has indicated that a Work in Protected Waters
Permit is required for the proposed excavation below the ordinary high water level (OHWL) of Rice Marsh
Lake, within water quality basin RM -1.1 and RM-2.6. In addition, the MnDNR has determined that the
remaining DNR jurisdictional work, outlet repair/alteration for water quality basin 2.6, will not require a
MnDNR permit, as this work falls under the District's MnDNR General Permit (97-6113). The MnDNR
"...
1
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2.0 Background
The Riley-Purgatory-Bluff Creek Watershed District (District) was established by the Minnesota
Water Resources Board in 1969, acting under authority of the Watershed Law. As charged by the
law and the order establishing the District, the general purpose of the District is to protect public
health and welfare and to provide for the provident use of natural resources. The District carries out
these purposes through planning, permit issuance, flood control, and conservation projects.
,.....
The District is located in the southwestern portion of the Twin Cities Metropolitan Area,
encompassing an area of 47.3 square miles. There are three major subwatersheds within the
District-Riley Creek, with a watershed area of 10.0 square miles; Purgatory Creek, with a water
area of 31.4 square miles; and Bluff Creek, with a watershed area of 5.9 square miles. All three
creeks discharge to the Minnesota River. Stormwater management within the urbanizing watershed
was guided initially by the District's Overall Plan dated 1973. The 1973 Overall Plan guided
development within District until it was revised in May 1996, Water Management Plan, in
accordance with the Metropolitan Surface Water Management Act and Watershed Law: Minnesota
Statutes Chapters 103B and 103D, respectively. The water quality improvement projects
recommended in the Engineer's Report for Lake Riley and Rice Marsh Lake, revised November 9,
2004, are the outcome of Use Attainability Analvses (UAA) prescribed by the 1996 Riley-Purgatory-
Bluff Creek Watershed District Water Management Plan (see Appendix C).
The UAA for Lake Riley and Rice Marsh Lake (Figure 1) were completed to provide the scientific
foundation for lake-specific management plans that will preserve existing--or achieve potential-
beneficial uses of the lakes. The UAA is a structured, scientific assessment of the factors affecting
attainment of a beneficial use, both currently and under ultimate watershed development conditions.
"Use Attainment" refers to achievement of water quality conditions suitable to support lake-specific
beneficial uses such as swimming, fishing, wildlife habitat, and aesthetic viewing among others, as
designated in the 1996 Water Management Plan.
Lake Riley is designated as a Level I "swimming lake" by the District (see Table 1) and, as such, its
water quality condition should score 53, or less, on the Carlson's Trophic State Index (Secchi disc
basis, TSIsn) rating system. This index score is calculated from the interrelationships between
summer Secchi disc transparencies and epilimnetic concentrations of chlorophyll a and total
phosphorus. (The index results in scoring generally between zero and one hundred; lower score
being indicative of better lake water quality.) A TSIsn score of 53 corresponds to a total phosphorus
,....
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3.0 Project Description
The Lake Riley and Rice Marsh Lake UAA: Water Quality Improvement Project involves the
alteration of five existing stormwater ponds and conveyance systems in Chanhassen, Minnesota. The
project is proposed to be conducted on approximately 9 acres of land, on five separate sites in the
cities of Chanhassen and Eden Prairie (Figure 2).
3.1 Project Need
The current summer average total phosphorous concentration of Rice Marsh Lake is approximately
150 JLgfL, down from an observed peak of710 JLg/L: in 1972 (see Figure 3), shortly after the
cessation of domestic wastewater discharges to the lake. Prior to that date, the lake was the receiving
water for wastewater effluents from the Chanhassen municipal-and Lakeview Hills Apartment-
wastewater treatment plants. Consequently, Rice Marsh Lake sediments are rich in phosphorus
subject to release into the overlying lake water during summer periods of sediment anoxia. Data
contained in the Lake Riley UAA demonstrate that the phosphorous concentrations of Riley Creek
waters increase by a factor of approximately 3 as the creek passes through Rice Marsh Lake. This
,..... indicates that the lake sediments are acting as a "nutrient pump", resulting in an increased
phosphorus load to Lake Riley. This phenomenon was also observed and reported in an earlier study
conducted by the Metropolitan Council (R.A. Osgood. 1983. Diagnostic-Feasibility Study of Lake
Rilev, Pub!. No. 10-83-095E).
The summer average total phosphorus concentration of Rice Marsh Lake has declined exponentially
over the past 33 years as the deposited phosphorus in its sediment have been released and flushed
through the system, and as new, less fertile sediments have buried the phosphorus-rich deposits (see
Figure 2). This has resulted in a generally declining phosphorus load to Lake Riley and its water
quality has improved somewhat as a result. Trend analyses indicate Lake Riley total phosphorus
concentrations have steadily declined over a 30-year period, from about 80 ILg/L in the early-1970s to
about 40 JLg/L in the late-1990s. However, more recent data suggest phosphorus concentrations may
now be rising as the lake's watershed is urbanizing.
Figures 4 and 5 contrast the existing and predicted future watershed land uses within the portion of
the Lake Riley watershed downstream from Rice Marsh Lake. As is clearly evident in Figure 5,
much of the currently natural, open space will be developed into suburban residential land uses.
Similarly, all agricultural lands will be converted to residential land use, or lost to construction of
."...
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3.2 Project Plan
The project plan includes the in-pond management actions within Rice Marsh Lake watershed.
However, stormwater treatments within the Rice Marsh Lake watershed will also benefit the
downstream watershed, Riley Lake (Sheet G2, Appendix E).
3.2.1 Rice Marsh Lake
Five improvements are proposed in the Rice Marsh Lake watershed (Figure 2), including:
. Upgrade an existing water quality basin (RM-1.1) on the northwest side of Rice Marsh
Lake, located within Rice Marsh Lake Park, south of Dakota Lane (Drawing W -01, Appendix
F). This stormwater management basin/wetland currently receives untreated stormwater and
is hydraulically linked to Rice Marsh Lake.
. Upgrade an existing water quality basin (RM-2.2) on the north side of 78th Street West,
south of Twilight Trail, and west of 187th Avenue (Drawing W -02, Appendix F). This
stormwater management basin/wetland presently receives untreated stormwater.
. Upgrade an existing water quality basin (RM-2.5) on the north side of Rice Marsh Lake,
located within Rice Marsh lake Park, southwest of Poplar Circle and southeast of Cheyenne
Avenue (Drawing W-03, Appendix F). This stormwater management basin/wetland
",-.. presently receives untreated stormwater and is hydraulically linked to Rice Marsh Lake.
. Upgrade an existing water quality basin (RM-2.6) on the north side of Rice Marsh Lake,
located within Rice Marsh lake Park, directly downstream of water quality basin RM-2.5,
southwest of Poplar Circle and southeast of Cheyenne Avenue (Drawing W -04, Appendix F).
This stormwater management basin/wetland presently receives untreated stormwater and is
hydraulically linked to Rice Marsh Lake.
. Upgrade an existing water quality basin (RM-6.5) located northwest of the intersection of
Highway 5 and Market Boulevard (Drawing W -05, Appendix F). This stormwater
management basin/wetland presently receives untreated stormwater.
,....
P:123\27\E6I\Wetland ReplacementlRPBCWD_ WQ_lmprov_ WRP.doc 7
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management goals of the District. In addition, the city of Chanhassen has plans to develop/utilize
these areas for purposes other than stormwater treatment. Briefly, the idea of purchasing upland
areas, where homes currently exist near the northern portion of Rice Marsh Lake, to construct water
quality treatment areas was discussed, but was immediately ruled-out due to the very high purchase
price and likely objections from landowners.
Storm water enters Rice Marsh Lake in specific locations and those inflows in need of additional
treatment were identified by the UAA. In order to treat those inflows to meet the Cities and District
water quality goals for the downstream water bodies; upland and existing stormwater management
locations, and alternative best management practices (BMPs) were the first areas explored. Due to
many factors, wetland impacts cannot be avoided in all locations where water quality treatment is
needed.
,...,
After considering all factors including: the location of the existing storm-sewer infrastructure, the
water quality treatment currently provided by existing storm water management basins, existing
topography, upland areas the City of Chanhassen or the City of Eden Prairie may be willing/able to
purchase for water quality treatment, and objections from landowners, it was not feasible or prudent
to stay completely outside of jurisdictional wetlands.
4.3 Proposed Alternative
The proposed alternative described in Section 3.0 is the only feasible and prudent alternative to
achieve the water quality goals of the District. The proposed alternative avoids and minimizes
regulated wetland impacts to the greatest extent practicable.
,....
For over two years, the District and the city of Chanhassen have worked with the property owners to
inform them of the project and determine acceptable areas suitable for stormwater management
basins. As was historically common practice, stormwater basins and ditches were placed in low-
lying wetland areas. The alteration of these wetlands to improve stormwater treatment occurred
before the passing of the WCA. These existing stormwater management areas typically represent the
most prudent location for improving stormwater treatment. After suitable water quality treatment
areas were located, the District, with input from city of Chanhassen staff, designed the stormwater
management basins to meet the water quality goals of the project, while avoiding/minimizing
wetland impacts. Completion of the project as proposed will have minimal impacts to wetland
resources and will improve the water quality of the two strategic water bodies, Lake Riley and
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"
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. Water quality basin 2.2: The amount of Type 3 and 4 wetland excavation was minimized to
the extent practical. The approximate reduction in regulated wetland impacts was
3.000 square feet.
. Water quality basin 2.6: The western extent of the proposed pond was altered to minimize
wetland excavation in the Type 3 wetland. In addition, the proposed pond was extended to
the east, utilizing existing upland. The approximate reduction in regulated wetland impacts
was 15.000 square feet.
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,.... 6.0 Wetland Delineation
6.1 Wetland Delineation and Classification Methods
The wetlands within the project area (Figure 2) were originally identified from aerial photographs
and were field delineated on May 2 through May 5,2005. The field investigation resulted in the
delineation of eleven wetlands within the initial project area (Figures 4-9, Appendix H). The
wetland boundaries were surveyed using a Global Positioning System with sub-meter accuracy. On
June 23, 2005, the wetland borders were field verified by the City of Chanhassen, the local
government unit administering the Wetland Conservation Act (Appendix I).
,.....
The wetland delineations were established according to the Routine On-Site Determination Method
specified in the U.S. Army Corps of Engineers Wetland Delineation Manual (1987 Edition). The
wetland were classified in accordance with the U.S. Fish and Wildlife Service Circular 39 System
(Types 1,2,3, etc.), and the U.S. Fish and Wildlife Service Cowardin System (PEMB, PSSC, PFOB,
etc.). The wetland boundaries were delineated with pin flags that were numbered and placed at
intervals of approximately 20 to 50 feet. A summary of the delineated wetlands can be found in
Table 2, Appendix H.
Information on soil types within the evaluation area was obtained from the Soil Conservation Service
(SCS) Soil Survey for Hennepin County and Carver County (Figure 2, Appendix H). The National
Wetlands Inventory map (Figure 3, Appendix H) shows seven wetlands within the initial project area.
The Minnesota Department of Natural Resources (MnDNR) Public Waters or Wetlands map (Figure
4, Appendix H) shows the presence of one public water (Rice Marsh Lake, PW 10-IP) within or
immediately adjacent to the project.
Numerous soil borings were placed in and around the wetlands, to a depth of at least 18 inches below
the ground surface whenever possible. Representative soil samples from each boring were examined
for hydric soil indicators. Soil colors (e.g., 7.5YR 4/2, etc.) were determined with the aid ofa
Munsell~ soil color chart and noted on the Wetland Data Forms (Appendix D). The hydrologic
conditions were evaluated at each soil boring and are also noted on the Wetland Data Forms.
,.....
The dominant plant species in each wetland were identified, and the corresponding wetland indicator
status of each plant species was determined and noted on the Wetland Data Forms. A summary of
the wetland classifications and wetland areas are provided in the following descriptions.
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""""
. Site RM-2.2: Wetland 1 is a 1.8 acre, Type 4/3/6 (PEMF/C/SSB) deep marsh/shrub-carr (Figure
7), which receives directed stormwater from inlets located at the north, west and east edges of the
wetland. The wetland is bordered by railroad tracks to the north, business parking lots to the east
and south, and is located northwest of wetland RM -2.1. A nursery is also located along the
southern edge of the wetland.
The wetland is dominated by cattail, reed canary grass, box elder, cottonwood, willow species
(Salix lucida and Salix nigra), red-osier dogwood, aspen, goldenrod (Solidago spp.) and Canada
thistle (Cirsium arvense). Upland vegetation includes cottonwood, oak (Quercus spp.), box elder,
goldenrod, Kentucky bluegrass, clover (Trifolium spp.), arborvitae (Thuja occidentalis), birdsfoot
trefoil, red-osier dogwood, maple (Acer spp.), and sumac (Rhus spp.).
The soil profile near the edge of the wetland consists of 5 inches of black (IOYR 2/1) loam,
above at least 11 inches of black (lOYR 2/1) loam with mottling. The wetland was inundated
with 6 inches to 2 feet during the May site visit.
,..... . Site RM-2.4: Wetland 1 is a 0.27 acre, Type 3/4 (pEMFIPABF) shallow marsh/deep marsh
(Figure 8), which receives directed stormwater from Lake Dr. to the south and business parking
lots and driveways along the north, west and east borders. A car wash is located north of the
wetland.
The wetland is dominated by cattail, duckweed, sandbar willow (Salix exigua) and box elder. The
upland vegetation includes mowed and maintained Kentucky bluegrass and planted blue spruce,
red pine and green ash. Impervious surfaces surround the wetland.
The soil profile at the edge of the wetland consists of at least 12 inches of black (10YR 2/1)
muck with numerous greenish gray (5G 5/1) mottles and inclusions of peat. Thirty percent of the
wetland is Type 4 (P ABG) and inundated with as much as 2 feet of water. Seventy percent of the
wetland is Type 3 (PEMF) and inundated with approximately 6 inches of water during the May
site visit.
,..... . Site RM-2.5: Wetland 1 is a 0.08 acre, Type 4/6 (PABGIPSSB) deep marsh/shrub-carr (Figure
9). The wetland receives stormwater from surrounding residential lots. A weir separates the north
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~
,....
. Site RM-2.8: Wetland 1 is a 0.035 acre, Type 1 (PEMA) seasonally flooded ditch along the
south side of the railroad tracks (Figure 10). This ditch receives stormwater from the railroad to
the north and surrounding uplands in the south.
The wetland is dominated by reed canary grass, cottonwood, boxelder and red-osier dogwood.
Approximately 50% of the wetland is unvegetated. Upland vegetation includes leafy spurge, reed
canary grass, goldenrod and cottonwood.
The soil profile in the center of the wetland consists of24 inches of black (10YR 3/1) sandy clay
with many distinct yellow (10YR 7/6) mottles. The soil was damp at the surface and water was
observed at a depth of 3 inches during the May site visit.
.
Site RM-2.8: Wetland 2 is a 0.003 acre, Type 1 (PEMA) seasonally flooded ditch, which
receives directed stormwater from an inlet west of Highway 101 (Figure 10). This small wetland
is located in the northeast corner of the evaluation area south of the railroad tracks and west of
Highway 101.
The wetland is dominated by fowl bluegrass, switchgrass (Panicum virgatum), and cottonwood.
Upland vegetation includes switchgrass and brome grass (Bromus inermus).
The soil profile within the wetland consists of 6 inches of very dark brown (10YR 2/2) loamy
clay with some yellowish brown (10YR 5/6) mottles, above 7 inches of gray (lOYR 5/1) loamy
clay with numerous yellowish brown (10YR 5/6) mottles and organic streaking. The underlying
11 inches is a light brownish gray (10YR 6/2) clay with numerous brownish yellow (lOYR 6/8)
mottles. The wetland was saturated to the surface and water was observed at a depth of 14 inches
during the May site visit.
No wetlands were found within the vicinity of the proposed pond at the center of the evaluation
area for Site RM-2.8.
.
Site RM-6.5: Wetland 1 is a 3.4 acre, 4/3/2/6 (PABG/PEMF/PEMC/PSSB) shallow/deep
marsh/shrub-carr (Figure 11), which receives directed stormwater from Highway 5 to the south
P:123\27\E61IWctland ReplacementlRPBCWD_ WQ_Improv_ WRP.doc 17
,....
,....
,....
The wetland is dominated by reed canary grass, hybrid cattail (Typha glauca), black willow,
peachleafwillow (Salix amygdaloides), and cottonwood. Upland vegetation includes reed canary
grass and brome grass.
The soil profile at the edge ofthe wetland consists of at 14 inches of black (1 OYR 2/1) muck
above 10 inches of black (10YR 2/1) loamy clay with sand and few large yellowish brown (10YR
5/6) mottles. Thirty percent of the wetland was saturated to the surface during the May site visit.
P:\23\27\E61\Wetland Replaccment\RPBCWD_ WQ_lmprov_WRP.doc 19
,.....
wetland bank is one of four existing wetland banks located within the major watershed, Minnesota
River -Shakopee, with sufficient credits available for sale to the public, and that has been approved
by the Corps.
The Corps has preliminarily indicated that all proposed project-related fill and excavation, within the
existing/proposed five stormwater treatment areas will likely be regulated by the Corps, requiring
compensation under the Clean Water Act. A total of 362,384 square feet (8.32 acres) of Corps-
regulated wetland impacts is associated with the project (Table 2). If wetland compensation is "in-
place", "in-kind", and "in-advance", the Corps's minimum compensation ratio of 1: 1 is acceptable.
However, impacts proposed within Type 4 (71,909 square feet) and Type 6 (17,411 square feet) are
planned to replaced "out-of-kind" (replaced with a different wetland type) with a replacement ratio is
1.5:1.
Corps Impacts and Proposed Compensation
,...,
Wetland Type
Type 2 Type 3 Type 4 Type 6
Impacts Required Impacts Required Impacts Required Impacts Required
Compensation Compensation Compensation Compensation
(I:l ratio) (1:1 ratio) (1.5:1 ratio) (1.5:1 ratio)
Totals
(sq. ft.) 107,864 26, II 7
86,968 86,968 186,097 186,097 71,909 (7 I ,909 · 1.5) 17,411 (17,41 I · 1.5)
Grand 362,384 406,995
Totals
(sq. ft.)
The mitigation for impacts under the Clean Water Act will be accomplished through a combination
of wetland re-establishment/vegetation enhancement activities, and the purchase of wetland banking
credits. A total of 295,419 square feet of stormwater management basins will be created/altered in
five locations as part of the project. The Corps has indicated that a 50 percent credit for a total of
147,710 square feet (295,419 square feet./2 - see Table 2) may be allowed. The remaining minimum
mitigation requirement, 5.95 acres (259,335 square feet), is to be provided by the purchase of new
wetland credits from the Mueller wetland bank, Account #1114. A draft Application for Withdrawal
of Wetland Credits form is provided in Appendix B. Mitigation for the proposed 3.28 acres of
I"""'" unavoidable WCA wetland impacts will include the purchase of 5.95 acres of new wetland credits
P:\23127\E61IWctland RcplaccmcnllRPBCWD_ WQ_lmprov_ WRP.doc 21
.~ 8.0 Post-Construction Maintenance and Inspection
The City of Chanhassen will inspect each of the five altered/enhanced water quality basins every five
years and will remove accumulated sediment as needed. In addition, the District will conduct annual
monitoring inspections of the FiltrexTM sock system, which will serve as a berm between Rice Marsh
Lake and water quality basin RM-l.l.
,.....
,....
P: \23\27\E61 I Wetland ReplacementlRPBCWD _ WQ_Improv _ WRP .doc 23
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