HomeMy WebLinkAbout4.a. Asbury Glen PondCITY OF ROSEMOUNT
EXECUTIVE SUMMARY FOR ACTION
CITY COUNCIL MEETING DATE: September 2, 2003
AGENDA ITEM: Asbury Glen Pond
AGENDA SECTION:
Response to Public Comment
PREPARED BY: Andrew J. Brotzler, P.E., City Engineer
AGEN j,
ATTACHMENTS: Memorandum, Map, Letter to resident
APPROVED BY:
Staff has prepared the attached memorandum as a response to the issue brought before Council at their August
19, 2003 meeting.
RECOMMENDED ACTION:
COUNCIL ACTION:
8
MEMORANDUM
TO: Honorable Mayor and City Council Members
Jamie Verbrugge, City Administrator
FROM: Andrew J. Brotzler, P.E. City Engineer
> Y
DATE: August 28, 2003
RE: Asbury Glen Pond
As noted by Mr. Eibner at the August 19, 2003 regular City Council meeting, City Staff has been
in communication with the residents of Asbury Glen since 2001 regarding the condition of the
stormwater pond located in the middle of Derby Circle. Through the course of City Staff's work
to monitor the condition of the side slopes for the stormwater pond, it has been noted that the
pond side slopes at the water's edge are being undercut due to a lack of stabilizing vegetation
around the perimeter of the pond and possibly wave action created by a water fountain located
within the pond.
Pond maintenance plays a significant role in the success of a functioning pond. A densely
vegetated pond perimeter promotes water quality and bank stabilization. Plant roots that
establish in the banks of ponds provide the soil with additional stability to hold the bank in place
and alleviate erosion. The existing bluegrass does not have the root structure and the density to
provide the desired bank stability. Staff has suggested as noted in the attached letter dated May
27, 2003, that routine mowing and maintenance of the pond side slope to the water's edge be
discontinued, allowing for the development of a buffer zone.
Staff has identified options for Council consideration to address this issue:
1. The first option is to hard armor the banks of the pond with rip -rap and geo- synthetic
fabric. The rip -rap will provide stability of the pond side slope around the perimeter
of the pond. This option would be similar to the project completed for Wensmann
Pond located along Diamond Path.
It should be noted that Wensmann Pond functions as a regional pond in the City's
stormwater system and is subject to regular fluctuation in elevation due to discharge
from Birger Pond and Hawkins Pond Lift Stations. It is this regular fluctuation in
Asbury Glen Pond
water elevation in Wensmann Pond as a regional pond that resulted in the completion
of the bank stabilization project by the City.
The estimated cost to complete a project to rip -rap the subject pond is $7,000 to
$10,000.
2. The second option is to provide a buffer zone of appropriate native vegetation around
the perimeter of the pond. A mixture of aquatic and terrestrial vegetation around the
perimeter of the pond will promote stabilization of the bank and a buffer zone. An
item to note with this option is the time required, two to five years, to develop a
vegetative buffer zone around the perimeter of the pond. Continual monitoring and
possible replanting may be required to ensure the success of a vegetative buffer zone.
The estimated cost for this option is $5,000 to $7,500.
3. The third option would be to do nothing. City Staff will continue to monitor the pond
annually for scouring and undercutting of the pond side slope of the water's edge.
The attached copy of the plat for Wensmann Sixth Addition shows the pond to be located within
a drainage and utility easement of Lot 48, Block 4. This area is privately owned by multiple
parties, presumably and association. The drainage and utility easement over Lot 48, Block 4
exists to ensure the City's ability to maintain the storm sewer into and out of the stormwater
pond and to prevent the stormwater pond from being altered and unable to function as a part of
the stormwater system for the Wensmann Sixth Addition development. In the past, the City has
typically only completed work on stormwater ponds to maintain a ponds ability to function as
part of the stormwater system.
Staff is requesting Council direction on this item.
2
CITY O F RO S E M O U N T 2875 - `;45th s eet West
Rosemount, MN
55068 -4997
Phone: 651.423 -4411
Hearing Impaired 651 - 423.6219
Fax: 651- 423 -5203
May 27, 2003
James Heath
15036 Derby Circle
Rosemount, MN 55068
Re: Retention Pond
Dear Mr. Heath:
This correspondence is in response to your concerns regarding erosion of the stonmwater retention pond
within your development and adjacent to your residence. Since June of 2001, when the issue of erosion
of the stormwater pond side slopes was brought to the attention of City Staff, visual inspections of the
pond have been performed periodically over the course of the year. From these visual inspections, City
Staff has made note of the scouring and undercutting that has been occurring to the pond banks.
At this time, it should be noted that the scouring and undercutting of the pond side slopes at the waters
edge appears to be a result of the fountain installed in the pond, and the lack of aquatic vegetation around
the perimeter of the pond. The wave action created from the water fountain appears to be contributing to
the scouring and undercutting along the slopes of the pond. Also, the existing vegetation and routine
mowing to the waters edge does not allow for the development of appropriate plant types with a root
structure that will help stabilize the pond side slopes and minimize the undercutting that is occurring. The
existing blue grass does not provide a proper terrestrial area around the perimeter of the pond to stabilize
the slopes adjacent to the waters edge.
On May 23, 2003 I inspected the pond area to address the issue and report the findings. To address the
current issue, the City would recommend that the fountain be removed to eliminate the wave action and
ripple effect scouring the pond banks, and suspension of mowing and maintenance of the pond slope from
the waters edge for a distance of ten to fifteen feet.
Should you have questions or concerns in regards to this letter please contact me at 651- 322 -2005.
Respectfully,
Chad Donnelly
Water Resources Engineer
CC: Mary Riley, Rosemount City Council Member
Jamie Verbrugge, City Administrator
Andrew J. Brotzler, P.E., City Engineer
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d:
Design Guidelines for Pond Shoreline Stabilization Practices
in the City of Rosemount, Minnesota
I. Introduction and Background
The City of Rosemount contains numerous depressional areas that vary in size,
shape, depth, and water regime. The City has received complaints, comments, and
concerns regarding erosion, water fluctuations, and management of vegetation in
these areas. In response to public concerns and in an effort to address the variety of
issues involved, guidelines for shoreline design practices have been developed.
II. Design Options
Prior to selection of a design option, specific design considerations need to be
recognized, evaluated, and addressed in the design. Design considerations
commonly encountered include the effect of water level fluctuations within the water
body resulting from runoff or storm sewer inlets, and erosion of shoreline resulting
from steep slopes, lack of vegetation, ice movement, and wave action. Two basic
design options for projects involving shorelines are available and they include
methods utilizing vegetation or hard armoring. There are advantages and
disadvantages associated with each option for particular applications. Vegetating
and hard armoring can each be utilized to address the issues described above. In
many cases, a combination of them can be effectively and efficiently utilized in the
design of a project. Appendix A includes a table outlining design considerations
associated with these two options, and a description of each option follows.
A. Vegetated Stabilization Practices
Vegetated stabilization practices refers to the installation of plants and
bioengineered products along shorelines in an attempt to prevent erosion. A
vegetated shoreline (also called a buffer) provides habitat for wildlife and
improves water quality by filtering out sediment, pollutants, and excess
nutrients. Plants stabilize the soil and prevent erosion by intercepting
raindrops, binding soil particles with their root systems, and reducing soil
exposure to wind. Emergent plants prevent shoreline erosion by absorbing
the impact of wave action.
Plant species selection for stabilization projects should depend on site
conditions and the specific goals of the project. Native plant species should
be chosen because they are adapted to local environments. Effective
strategies incorporate diversity by using multiple native species. Improved
success can be accomplished by including native species that are present on
or near the site in the plant list for the project. Elimination of invasive non-
native species from the site prior to revegetating it will also improve the
WARosemount P]ants\RosemountGuidelines.wpd
success of native vegetation establishment. The most common invasive non-
native species that are problematic in Minnesota's wetlands include
buckthorn (Rhamnus cathartica, Rhamnus frangula), reed canary grass
(Phalaris arundinacea), and purple loosestrife (Lythrum salicaria).
A maintenance program should be incorporated into the revegetation plan for
weed control and any necessary plant replacement during the establishment
period. Three years is typically the amount of time required for successful
establishment of many native species, and control of invasive non - native
species during this period will provide a better opportunity for establishment
of those native species. Some plants will not survive the first year, and this
may create large gaps or areas susceptible to erosion. These areas should be
replanted as quickly as possible with any of the native species that appear to
be successful on the site.
Both seeding and planting strategies should be incorporated in the
revegetation plan to allow for a greater chance of successful revegetation of
the site. Numerous bioengineered products exist that can aid in the
stabilization of the soil and allow better plant establishment. An effective
strategy may include planting shrubs in clumps in selected areas of the
shoreline, planting plugs of emergent vegetation in clumps in selected
shallow water areas and protecting them with bioengineered products, and
seeding the remaining shoreline areas to create a native vegetation buffer.
When planting below the Normal Water Level (NWL), temporary wave -
breaking devices provide protection for establishing plants. Bioengineered
temporary wave - breaking products that have been successful include coconut
fiber logs, hardwood brush, rock within filter fabric, or plywood. Double
layers of plastic fence also work well as temporary wave - breaking devices.
Plant- anchoring methods have also been successful at protecting establishing
plants below the NWL. Coconut fiber and jute are commonly used materials
for plant - anchoring.
Bioengineered products may be helpful when planting above the NWL. Most
bioengineering methods require a slope no greater than 2:1 (horizontal:
vertical). Erosion control can be accomplished using bioengineered fabrics
of jute, coir, and wood fiber. Mulches can be used to hold seed in place and
retain moisture. Wattles, live stakes, brush layers, and brush mattresses are
other types of bioengineering products that may assist in erosion control and
plant establishment.
A table of Recommended Plants for Vegetation of Shorelines in the City of
Rosemount is included in Appendix B to assist in selection of plant species.
The recommended plant species were selected due to their native ecological
region and growing environments, as well as specific characteristics that
WARosemount Plants\RosemountGuidelines.wpd
allow them to stabilize the soil or withstand inundation. Sample
specifications for seeding and planting are included in Appendix D. General
recommendations regarding seeding along pond shorelines in Rosemount are
described below:
1. For seed installation below the High Water Level (HWL)
Mn/DOT 25A Modified (25B) - Native Wetland
Sedge Meadow at a rate of 301bs /acre. This diverse native species
seed mix was developed for use on hydric soils and for wetland
restoration.
2. For seed installation above the HWL
Mn/DOT 38A Modified (38B) - Dry Mixed-height/Bluff Prairie at a
rate of 301bs /acre. This diverse native species seed mix works well
state -wide and in many soil types.
B. Hard Armoring
Hard armoring refers to the use of materials like riprap (large rock) and
concrete along shorelines. Hard armoring provides immediate stabilization
of soil, and is useful for preventing erosion caused by wave action, ice action,
high water velocities, and extreme water fluctuations.
To provide sufficient shoreline protection for individual projects, existing
technical methods should be used to determine appropriate rock size,
placement geometry, and elevation.
Rip rap is the most common type of hard armoring utilized for shore
protection. Rock that has been crushed'or blasted is typically more stable
than rounded boulders because this type of rock locks together better.
Geotextile fabric is typically placed below the rip rap to reduce soil loss. The
Minnesota Department of Transportation (Mn /DOT) Standard Specifications
for Construction, 2000 Edition should be referred to for rip rap specifications
(Section 2511).
C. Combination
Both vegetating and hard armoring can be utilized in the design of a project
to suit individual site conditions. For example, hard armoring may be placed
in areas that experience high water velocities or along steep slopes, and
vegetation may be installed in the remaining areas. Each site will have
unique conditions, and a combination of the options described might be the
most effective and efficient design strategy.
WARosemount P]ants\RosemountGuidelines.wpd
III.' Selection of Design Option
A number of variables should be considered for selection of the appropriate design
option for a project. Each project will have distinct issues that should be addressed
in the design. A list of possible topics for consideration follows.
A. Other Agency Approval
In some instances, the Department of Natural Resources (DNR) and/or the
US Army Corps of Engineers (ACOE) may have jurisdiction over shoreline
projects. All work involving existing wetlands must be in compliance with
the Wetland Conservation Act.
B. Compatibility with Wetland Management Plan
The City of Rosemount Comprehensive Wetland Management Plan classifies
existing wetlands within the City, and each classification has specific
requirements regarding buffer widths, management strategies, storm water
management, and mitigation. Copies of the wetland management categories
and descriptions from the Plan are included in Appendix C. Buffer
requirements range from 15'- 75' dependent on the designated management
class for each wetland. Because buffers are composed of vegetation by
definition, the use of vegetation on shorelines is preferred and meets the City
requirements.
C. Design Considerations
A table outlining characteristics associated with vegetating and hard armoring
is included in Appendix A and describes the following design considerations:
1. Installation cost
2. Maintenance
3. Aesthetics
4. Wildlife habitat
5. Water quality
6. Erosion control
7. Water fluctuations
D. Design Selection
Prior to design option selection, pertinent issues need to be recognized,
evaluated, and addressed. The design should address all issues of concern
and result in a shoreline stabilization project with good chances of success.
IIIA. Design Option Selection Recommendations for the City of Rosemount
Based on the issues described in Section III above, it is recommended that vegetated
W:\Rosemount Plants\RosemountGuidelines.wpd
designs be utilized along shorelines within the City where such designs are feasible.
Vegetated shorelines are compatible with the City of Rosemount Comprehensive
Wetland Management Plan, and are more likely to be supported by the Department
of Natural Resources and US Army Corps of Engineers.
Utilization of hard armoring practices could be considered based on a review of the
following conditions:
• steep slopes (steeper than 2:1 [horizontal:vertical])
• intense wave, wind, or ice action on the shoreline
• extreme bounce for long duration within water body
Such conditions may limit plant establishment and survival, and the presence of
these conditions may necessitate hard armoring for specific projects.
IV Applicability of Guidelines
These recommendations are provided to serve as general guidelines for projects
involving shorelines in the City of Rosemount, MN. Professional assistance is
recommended for the design and installation of shoreline projects. All projects
involving existing wetlands within the City should comply with the Wetland
Conservation Act, the City of Rosemount Comprehensive Wetland Management
Plan, and any agency having jurisdiction.
WARosemount P1ants\RosemountGuideHnes.wpd
APPENDIX A
Design Considerations for Shoreline Projects
in the City of Rosemount
WARosemount Plants\RosemountGuidelines.wpd
.Design Considerations for Shoreline ]Projects
in the City of Rosemount, MN
DESIGN
NATURAL
CONSIDERATIONS
INSTALLATIONS
HARD ARMORING
Installation Cost
• Dependent on strategy
• Dependent on material
(seeding is typically less
expensive than planting) and
• Rip rap and Geotextile necessary -
diversity of species (expense
approximately $40,000 - $100,000
typically increases with
per acre for rip rap material and
diversity)
installation; approximately
• Approximately $600 -
$15,000 - $20,000 per acre for
$9,000 per acre for seed
Geotextile material and
installation and annual
installation **
maintenance*
Maintenance
• A minimum 3 -year
• Routine maintenance for weed
maintenance plan should be
control
included to assist plant
establishment
• Low maintenance for weed
control (once established)
Aesthetics
• Natural appearance
• Institutional appearance
• Flowers, fruits, and foliage
• appearance does not change
create year -round interest
Wildlife Habitat
• Provides habitat - diversity
• Provides minimal wildlife habitat
of wildlife increases with
diversity of plants
Water Quality
• Acts as a buffer (once
• No buffer - can negatively impact
established) - improves water
water quality by increasing water
quality by capturing
temperature and runoff rate -
sedimeat and nutrients
Erosion Control
• Requires plant establishment
• Immediate stabilization
period
• Can be installed practically
• Strengthens with time
anywhere
• Appropriate species should
• Variety of materials
be chosen * **
Water Fluctuations
• Few species can tolerate
• Can be installed to suit particular
(bounce)
long -term inundation to
levels of bounce
depth greater than 3';
Appropriate species should
be chosen * **
�v"rut:- 4vv 1 X : r�tZWZ'dU0II5 t-OSL DSUHOWS
** Source: Mn/DOT 2000 Average Bid Prices; Geotextile Manufacturers Average Sale Price.
* ** See Recommended Plants for Vegetation of Shorelines in the City of Rosemount (Appendix B)
WARosemount P1ants\RosemountGgide1ines.wpd
APPENDIX B
Recommended Plants for Vegetation of Shorelines
in the City of Rosemount
WARosemount Plants\RosemountGuidelines.wpd
S
1. Deep Water - Typically inundated 14" - 5'
2. Shallow Water Typically inundated to 14 ", saturated soil
3. Saturated Soil - Typically not inundated, moist year -round
4. Moist Soil - Rarely inundated, not saturated, periodically dry
Recommended Plants for Vegetation . -ihoreiine Areas in the City of Rosemount
1
Deep Water -
Typically
Inundated
14 " -5'
2
Shallow Water
Typically
Inundated
from 0" - 14"
Sources: Adopted aom 1) Cakescaping for tMldlltb and WeterQua!W (Department of Natural Resources publication)
2) Native Vegetation In Restored and Created Wel/ands (Minnesota Board of Water and Soil Resources publication)
A WO1R-cammardad PI.M.Sh.ett
Horsetail
Equisetum fluviaHle
0.5.3.0
1.0 -2.0
spreads quickly; bank stabilizer
Grass /fort/
Water smartweed
Poly gondm am h bium natans)
1.0 -5.0
3
June-Aug
terrestrial or aquatic; spreads quickly; pink flower
sedgetrush
Hardstem bulrush
Sdrpus acutus
3.0 -9.0
1.0 -3.0
wave buffer
Broad leaved cattail
Typhe IaBloria
3.0 -9.0
2.0 -4.0
spreads readily; forms floating mats
Sweet Flag
Acorus calamus
2.0 -3.5
2.5
May -July
establishes quickl
Water plantain
Alisma /ante o-a ualica
2.0 -3.0
2.0 -3.0
May-Se
tolerates Inundation; white flowers
Water sedge
Carex a ualilis
2.0 -5.0
2
forms hummocks
Lake sedge
Carex lacustris
2.04.0
1.5-3
spreads strongly by rhizomes
Whooly needle sedge
Carex lasioca s
2.0 -3.5
2.0 -3.0
spreads by rhizomes
Retrorse sedge
Carex retrorsa
1.0 -3.5
1.0.2.0
showy spikes
Needle rush
E/eocharis adculeris
0.2 -1.0
1.0 -2.0
establishes voluntarily; spreads by rhizomes
Grass /forb/
Blunt spike rush
Eleochads obtuse
0.5 -2.0
1.0 -2.0
establishes voluntarily; spreads by rhizomes
sedge /rush
Sneezeweed
He/enium autumna/e
2.0 -5.0
3
Aug -Oct
yellow flowers
Blue flag iris
Iris versicolor
1.5 -3.5
2
June - July
bank stabilizer tolerates drier conditions
Soft rush
Juncus efrusus
1.54.0
1.0 -2.0
tolerates Inundation
Green bulrush
Sdrpus strovirens
2.0 -5.0
2.0 -3.0
can tolerate flood $ drought for short periods
Wool sass
Sdrpus cype
3.0 -5.0
2.0 -3.0
tolerates Inundation; rhlzomatous•
River bulrush
Scirvus fluviatilis
4.0.6.0
1.0 -3.0
spreads by rhizomes
Three -a uare bulrush
Scirp pung ens
2.0 -4.0
2.0 -4.0
spreads by rhizomes
Softstem bulrush
Scirpus va6dus
3.0 -9.0
1.0 -3.0
tolerates inundation establishes readily from seed
Giant bur -reed
Sparg anium eury
2.0 -3.5
3
June - July
spreads readil
Prairie cord grass
S arlina pecUnati
3.0 -6.0
2.0 -3.0
spreads by rhizomes yellow fall color
Buttonbush
Ce ha/anthus occidentaps
6.0-12
August
tolerates Inundation; white flowers
Red -osier dogwood
Comus serfcea sto/oni/ere
6.0-12
May-June
tolerates Inundation; white flowers red twl s
Eastern cottonwood
Po ulus deltoldes
90
tolerates Inundation; fruits are messy in early summer
Tree /shrub
Sandbar willow
Sarix exi ue
4.59.0
tolerates Inundation; rhizomatous• transplants easil
Black willow
Selix ni re
35 -50
tolerates Inundation yellow fall color
Meadowsweet
Spires albs
2.0 -5.0 j
July
fragrant; orange fall color
Sources: Adopted aom 1) Cakescaping for tMldlltb and WeterQua!W (Department of Natural Resources publication)
2) Native Vegetation In Restored and Created Wel/ands (Minnesota Board of Water and Soil Resources publication)
A WO1R-cammardad PI.M.Sh.ett
Recommended Plants for Vegetath _ ..f Shorelines In the City of Rosemount
8/8/07 Recommended PlanleSheet2
- - ----. , ._ . - .• -•,, , i �...�.:.N.��v � rrno�rre eno werer uvertty (txpertment of Nalunl Reaoura$ publla8on)
2) Native Vegetation in Restored and Created WeBands (Minnesota Board of Water and Soil Resource$ publication)
APPENDIX C
Wetland Management Categories and Descriptions
from
City of Rosemount Comprehensive Wetland Management Plan
W ARosemount Plants%RosemountGuidelines.wpd
TABLE 1. NVETLAND MANAGEMENT CATEGORIES AND DESCRIPTIONS.
Management
Function
Buffer
Management Strategy
Stormwater
Mitigation
Class
Score
Required
Management
Requirement
PRESERVE
660-425
75 feet
Maintain functionality to
Sediment and
. Maximum
greatest degree possible.
nutrient
protection under
Enhanced WCA
pretreatment,
state and federal
avoidance and sequencing
consider
law. Replacement
standards. Minimum
diversion.
of function/values
development impacts.
and buffer in kind.
M aximiz e monitoring and
education.
MANAGE I
420 - 280
50 feet
Maintain or improve
Sediment and
Maximum
Wetlands
functionality. Apply
nutrient
protection under
selected
WCA sequencing
pretreatment.
state and federal
for
standards. Monitoring
law. Replacement
special
and education.
of fimction/values.
value.
MANAGE 11420
- 280
30 feet
Maintain functionality.
Sediment
WCA sequencing
Apply some WCA
pretreatment.
and replacement.
sequencing flexibility.
UTILIZE
275-0
15 feet for
Allow utilization for
No
WCA sequencing
non -ag
stormwater. Allow
pretreatment.
and replacement
areas only
maximum WCA
flexibility.
sequencing flexibility.
Source: The City of Rosemount Comprehensive Wetland Management Plan (July, 1998)
0
Rosemount wetlands.
The primary differences in management strategies are outlined in Table 1 below. Philosophically
the management strategies call for increasing levels of protection for wetlands that score high in
the functional assessment. In terms of actual management practices these different levels are
implemented through buffer zones, stormwater treatment, and education.
Buffer Zones
Buffer zones are non - wetland areas which extend some specified distance from the border of the
wetland itself, within which no grading or altering of the natural vegetation is allowed. For
example, a 50 foot buffer around a we means that no grading, filling or alteration of
vegetation through application of seed or herbicide or mowing is allowed within 50 .feet of the
wetland boundary in any direction. The wetland boundary used is the edge of the area defined as
wetland in the definition of Section 3.
Buffer zones have been widely used as effective management practices toward protecting the
integrity of wetland systems. The buffers provide a margin of natural vegetation. This margin
serves a range of benefits including:
►a filter for trash in runoff
, -uptake of runoff pollutants
►cover /nesting areas for wildlife
-protection for the intermittently flooded and sensitive outer margin of the wetland from
erosion and excessive human traffic
, -protection of vegetative diversity.
To determine appropriate buffer widths a survey of research information and current standards at
other governmental units was done. Generally, widths range from 15 feet, seen as a minimum
toward some benefit, to 100 feet, where benefit with increasing length seems to diminish. For
this.plan a buffer range of 15 -75 feet is used. This range was deemed an optimal balance
between buffer effectiveness and land required. Effective protection is attained without undue
impacts to property owners. Buffer widths were assigned to management categories as follows:
► 75 feet for the Preserve Category
► 50 feet for the Manage I Category
► 30 feet for the Manage II Category
► 15 feet for Utilize Category wetlands in non - agricultural areas.
► 0 feet for Utilize Category wetlands in active agricultural areas.
Where possible wetland buffers should be included as part of existing or proposed ponding
easement. Generally, wetlands and buffers will be part of private property and the responsibility
for maintaining buffer requirements lies with the property owner.
Page 11
Z 1920d
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aql aiojaq panoiddt, uaaq ant,q sit,jd It,ug ojo m mm sE pougop sit' suon padolanap XIsnoiAaad
. :Poua
IEuout,onpo anrsuaJm TIE spuounu000i uujd s ill; puo jvp psumol puu poo}ssapun a lt, siUouoq
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Isixa lou op siagjnq oiotlm suom piumol posnoog oq saomosw uoijuonpo lugl papuajuj si 1! `saTpt
anpoag�a avoid pjnom seam padolanap TIT st, alt' iag3nggo luauiooiojuo 13u4s luip anaTjoq jou
op ut,ld s1Tp 01 sioInquIuoo aTLL •SpuEjjaM.luau put' 0 ju ao u CpE anij oTIM s l aunno fli odoid pmmol
paloaiTp uoilvonpo lualsisiod urow jjtm sluouiannbai lajjnq puellaen `a.iag •paTjoua .4uo am000q
zAuq saoilot,id oit,o mmj It,nl!gtq `pogsrlgLqso Mann am spoogiogilStau Iuuuoplsai a.iogen sual
TII igBtt, -4s aq o} sosimold st,ait, guidolanap U! sauoz sajjnq Sutoioguo put, .3uprzuijaQ
padolanaQ ,Sjsnotna.Td suaxV ui s.Ta33ng
- laauTSug tA4To aTp Xq panoiddE so uoilzogloods X]i iod
aq jjt,gs luaumould ump pm; sio:ImLu IIy - fmpunoq lajjnq oqj put' sautl jo13o suoiloosizIm aq1 It,
paould aq X11 IIEgs sjwjn W •asodmd noip aluls Xl=lo put, luuaiuui algt'mp t' 3o oq jjt,gs
s'Q:jlu W •sauoz iajgnq pu oTp jo o2po ialno oip limm Tlorcjrn um ui uoiIEjjt,�suT io3
ajgisuodsai aq jlEgs iadojanap aTp `ut'jd s p jo ogEssud of jumbasgns sjuauidojanap nnau jjt, 303
Impacts due to development or other construction activity are regulated under the Minnesota
Wetland Conservation Act (WCA). In terms of impact mitigation, the WCA serves as a baseline
for evaluation of impacts and associated wetland replacement plans. This Plan then, specifies
guidelines for City Staff and Commission/Council review and recommendations for individual
wetlands to insure resources allocation is optimized. The, guidelines are as follows:
*PRESERVE: Maximum protection under state and federal law. Replacement of the
wetland function/values as assessed by the methodology of Section 8, and replacement of the
buffer in kind.
►MANAGE 1: Maximum protection under state and federal law. Replacement of the
wetland function/values as assessed by the methodology of Section 8.
►MANAGE II: WCA sequencing and replacement.
►UTILIZE: WCA sequencing and replacement flexibility.
Except for transportation projects, all wetland mitigation done for wetlands impacted in
Rosemount, shall be done within the city limits of Rosemount. Wetlands created as mitigation
for impacted wetlands shall be monitored for five years after completion of construction. The
monitoring shall be designed to determine the success in replacing impacted wetland values and
functions. This monitoring shall include at minimum: a yearly Rosemount function/value
assessment as used for this plan, a biological survey including both plant and animal counts and
sechi disk readings if applicable. To insure that follow -up monitoring is performed a
performance bond shall be required. Twenty percent of this bond shall be returned to the
developer with city approval of each yearly monitoring report.
"New" Wetlands
"New wetlands" include wetlands deliberately created where none existed at the time this plan
was adopted. This might include wetlands created as part of a wetland mitigation/creation
project or storm ponds created as part of development. Wet areas created by human activity not
intended to produce a pond or wetland shall not become part of this plan. When non - agricultural
surface water bodies are initially formed they shall come into the plan as part of the Utilize
category or as otherwise specified by the City Engineer. The City Engineer may place a created
wetland in any category that is appropriate before the functionality has reached the level required
by this plan.
Because these kinds of projects take time to develop into functioning wetlands the functional
assessment, if done immediately, would not provide a reasonable indicator of the quality of the
wetland as intended. Rather a functional based categorization should be undertaken when the
wetland has reached the fully developed functionality intended. Normally it could take 5 -10
years for a created wetland to become established. A full functional assessment shall be done 5
years after its creation and scores stored in the wetlands database. Upon review of the new ,
wetland's progress and score, the City Engineer shall place it in the category appropriate to the
score.
Page 13
APPENDIX D
Sample Specifications
WARosemount Plants\RosemountGuidelines.wpd
SECTION 1000 -PLANT INSTALLATION
01 SCOPE OF SERVICES
This work consists of furnishing all materials, equipment, and labor required for the planting,
maintenance, guarantee, and replacement of plant materials designated in the Plan or as
designated by the Engineer.
Work of this section shall conform to the requirements of all laws, ordinances, rules, regulations,
and orders of public authorities having jurisdiction. The Contractor shall secure and pay for all
permits, fees, and licenses necessary for the proper execution of the described work.
02 REFERENCES
All references herein referring to MnDOT specifications are Minnesota Department of
Transportation Standard Specfications for Construction, 2000 Edition.
03 MATERIALS
A. Mulch
All planted trees and shrubs shall be mulched following planting. MnDOT Type 1 (consisting of
grain straw only), Type 7B, or Type 8B shall be used.
B. Water
Water shall be furnished by the Contractor for the execution of all work specified in this contract.
The Contractor shall provide water to the site. Contractor is responsible for watering all plants
until the guarantee period expires.
C. Seedling shelters
Shelters for seedling trees shall be from the approved list on file with the MnDOT Landscape
Unit.
D. Tree wrapping
Tree wrapping shall be first quality, four inch wide material specifically manufactured for tree
wrapping, and having qualities to resist insect infestation.
E. Burlap and Wire Baskets
All material used for plants that are ball and burlap type shall be biodegradable. The burlap and
rope shall have no synthetic fibers and the wire used for the basket shall not be galvanized.
P:1 WP W IN\ 1237 -1 Olseedspec.wpd
F. Nursery plant stock
All plant stock indicated on the list of plants shall be supplied by the Contractor.
Any substitution must be approved by the Engineer prior to installation.
44 PLANT MATERIAL STANDARDS
A. Plant Stock
All plant stock shall meet MnDOT Specification Section 3 86 1.
B. Ouality
All plants shall be true to type; plants shall be healthy and free from defects, disfiguring knots,
sun scald injuries, abrasions of the bark, disease, insect eggs, borers, and all forms of infestation.
All plants shall be nursery grown, and shall have been growing in USDA Plant Hardiness Zone 3
or 4 for at least two years prior to the date of this contract.
C. Ball and Burlap (B &B)
All balls shall be of natural earth in which the plant has been growing. No manufactured or
artificially produced or mudded -in -balls shall be accepted. Balls shall be firm and unbroken, and
of appropriate size to adequately enclose the plant's fibrous root system. B &B plants may be
rejected due to their failure to meet good digging practices.
D. Plant List
Dimensions described in the list of plants are minimum requirements. Plants indicated as B &B
are to be dug with a ball of earth and wrapped in burlap.
E. Inspection
Contractor shall be responsible for all inspection and approval of plant material that may be
required by federal, state, and other authorities. Contractor shall secure any permits and
certificates that may be required. Any inspection certificates required by law shall be submitted
to the Engineer. All plants shall be inspected upon delivery for quality and size. Plants are
subject to rejection during progress of work due to size, condition, defects, or injuries. All
rejected plants shall be removed from the project site immediately.
F. Time of Plantin
Deciduous potted plants: April 1 -June 1; August 21- November 15
Deciduous B &B: April 1 -June 1; October 10- November 15
Evergreen potted plants: April 7 -May 17; August 25- October 15
Evergreen B &B: April 7 -May 17; August 25- October 15
G. Dieing and Handling
Protection from extremes in exposure and rough handling shall be provided for all plant materials
FA WP WIM 1237- 10lseedspec.wpd
during transport, while being stored, and during planting. All plant materials shall be assembled
in one location on the project site to permit inspection and approval by the Engineer. The
Contractor shall notify the Engineer five (5) working days prior to planting in order to make
arrangements for inspection. All plant materials rejected by the Engineer shall be removed from
the project site immediately and replaced with plant materials meeting the Specifications at the
Contractors expense. Plants shall not be pruned prior to approval by the Engineer.
05 GENERAL PLANTING
Plant communities shall be planted as defined in the planting plan.
The boundaries of plant communities shall be marked in the field by the Engineer.
Planting shall be conducted as specified in the plans and shall not take place when the ground or
overlying water is frozen or when conditions are otherwise unfavorable.
When all required mulching and disc anchoring is complete, the entire area shall be watered such
that the upper 1.5 inches of soil is saturated. Water shall be applied such that surface erosion or
displacement of mulch and seed do not occur.
06 TREE PLANTING
A. Layout
All tree locations will be staked by the Contractor in the field to conform to the Plan. All
locations shall be approved by the Engineer prior to digging and placement. Where planting in
accordance with the Plan is not possible, a new location must be approved by the Engineer prior
to digging and placement.
B. Planting Pit
Planting pits shall be circular with a diameter two feet greater than the diameter of the ball of the
tree. The depth of the pit shall be such that the flare of the tree is set at its original grade.
C. Setting Trees
Trees shall be set on undisturbed native soil or thoroughly compacted backfill soil at the same
depth it was grown in the nursery. The flare of the tree shall not be set below grade.
B &B trees shall be placed in the planting pit with burlap and wire basket, if used, intact. The
tree shall then be backfilled halfway and watered. The burlap shall be cut or folded back off the
top of the root ball. The tree shall then be backfilled to grade and watered. After the tree has
settled, backfill any voids and construct a 3" depth watering basin such that no roots of the tree
are exposed.
F:\WP WIN\ 1237- 10 \seedspec.wpd
D. Second Watering
All trees shall be watered within two hours of planting. If soils contain excessive moisture, the
second watering is not required.
E. Mulching
Mulch shall be. placed in a minimum 1- foot - diameter circle around the trunk at a minimum 4
inch thickness within 48 hours of planting. Mulch shall be pulled away from the base of the tree
such that no mulch is directly touching that portion of the tree.
F. Pruning
Only dead or damaged branches shall be removed from the trees. No leaders shall be cut. All
pruning shall be done with clean, sharp tools.
G. Tree Wrapping
All deciduous trees shall be wrapped with specified tree wrap. The wrap shall be secured at the
base and the top of the trunk such that the entire surface of the trunk is covered to the height of
the first branch. Trees shall be wrapped after November 1 and the wrapping shall be removed by
the following April 15.
F:1WPW ,T\1237- 10\scedspec.wpd
SECTION 2000 - NATIVE GRASS AND FORB SEEDING
01 SCOPE OF SERVICES
This Section describes the work required for areas to be seeded with native species. This work
includes site preparation, seed mixes, the materials and methods to be used, and maintenance.
Work of this section shall conform to the requirements of all laws, ordinances, rules, regulations,
and orders of public authorities having jurisdiction. The Contractor shall secure and pay for all
permits, fees, and licenses necessary for the proper execution of the described work.
02 REFERENCES
All references herein referring to MnDOT specifications are Minnesota Department of
Transportation Standard Specifications for Construction, 2000 Edition.
03 REQUIREMENTS
A. General Requirements
All native seeds used shall be certified to be of Minnesota origin by the Minnesota Crop
Improvement Association (MCIA) at the Yellow Tag level. Documentation verifying the origin
of the seed shall be provided to the Engineer at least 30 days prior to installation. In the event
that required species may not be available as certified, those species may be supplied by a MCIA
Certified Approved Collector/Producer along with documentation demonstrating the origin of
those materials. All substitutions must be approved by the Engineer. All seed requiring special
pregermination treatment shall be so treated prior to installation. Seed shall be stored at room
temperature no higher than 60 °F and a relative humidity between 20 and 40 percent.
Written certification from the suppliers of the native grass and wildflower seed shall be
submitted to the Engineer and shall include:
1. Name and location of seed supplier(s)
2. Amount of seed purchased
3. Origin and date of harvest for each type or species of seed
4. Germination rate and percent purity for each type or species of seed
Contractor is responsible for successful establishment of the seed and shall replace all
unsuccessful seeding until adequate establishment of the seeded vegetation as determined by the
Engineer.
Wetland areas shall be seeded throughout the growing season as long as the seedlings have
sufficient water. Upland areas shall be 'seeded in the spring or summer before August 1 or in the
FAWP V7M 1237- 10lseedspec.wpd
fall between September 20 and freeze -up.
Seed mixtures shall be sown in all portions of the plan that specify seeding as a strategy.
04 MATERIALS
A. Seed Mixture Designations
The seed mixture used shall be MnDOT Mixture 25A Modified (25B) - Prairie Sedge Meadow at
a rate of 30 lbs per acre for areas below the High Water Level (HWL) of 899.2. The seed
mixture used shall be MnDOT Mixture 38A Modified (38B) - Dry Mixed-height/Bluff Prairie at
a rate of 30 lbs per acre for areas above the HWL.
B. Cover Crop
Cover crop seed shall consist of oats for spring planting and winter wheat for fall planting at a
rate of 20lbs /acre.
C. Mulch -
Slopes that are 3:1 and gentler shall be mulched and disc anchored following seeding. MnDOT
Type 1 (consisting of grain straw only), Type 7B, or Type 8B shall be used at an application rate
of 2 tons per acre. Seeded areas shall be mulched within 24 hours after seeding is completed.
All planted trees and shrubs shall be mulched following planting. MnDOT Type 1 (consisting of
grain straw only), Type 7B, or Type 8B shall be used. Mulch shall be placed in a minimum 1-
foot- diameter circle around the trunk at a minim 4 inch thickness within 48 hours of planting.
Mulch shall be pulled away from the base of the tree or shrub such that no mulch is directly
touching that portion of the tree or shrub.
Mulch used shall be certified by the Minnesota Crop Improvement Association (MCLk) to be
free of noxious weed seeds, seed bearing stalks, and/or other reproductive propagules as defined
by rules and regulations of the Minnesota Department of Agriculture. Documentation verifying
that the mulch has passed MCIA field inspections shall accompany the material upon delivery to
the job site. The mulch shall be in air dried condition upon delivery to the job site.
D. Erosion Control Blankets
Erosion control blanket shall be used on slopes that are steeper than 3:1 and areas where runoff
may be channeled onto the seeded areas. Straw /Coconut 2S shall be used where seeding is done
in a ditch or swale that will receive moderate water flows and in areas where runoff may be
channeled onto the seeded areas. Straw 2S shall be used for all other slopes steeper than 3:1.
F:\WPWM1237- l O\ceedspec. wpd
05 SITE PREPARATION
Prior to seeding, any existing non - native ground cover in the area to be seeded shall be
eliminated with herbicide. In areas where herbicide can come into contact with water, Rodeo —
shall be used.
The topsoil should be loosened to a minimum depth of 3 inches.
06 SEED INSTALLATION
Seeding shall occur after the installation of trees and shrubs on site.
Seed shall be installed with a seed drill that will accurately meter the types of seed to be planted
and keep all seeds uniformly mixed during the drilling (Truax - type). The drill should contain a
minimum of two seed boxes; a fine seed box, and a seed box for large /fluffy seeds. The drill
should be equipped with disc furrow openers and packer assembly to compact the soil directly
over the drill rows. Maximum row spacing should be 8 inches. Small and fine seeds should be
drop- seeded onto the ground surface from the fine seed box. Large/fluffy seed should be placed
to obtain a final planting depth of 1/4 to i/z inch. All drill seeding should be done at a right angle
to surface drainage.
For areas inaccessible by a seed drill, seed shall be broadcast by hand or with a mechanical
spreader.
The site should be lightly harrowed or raked following seeding. The site should be packed
following harrowing to ensure a_ firm seed bed. The site should be mulched and disc anchored
following packing.
07 THREE YEAR MAINTENANCE PROGRAM
Year 1
Establishment - spring seeding:
5. Prepare site: late April - May
6. Seed: May 1 - July 1
Maintenance:
L. Mow (6 -10 inches): July 15 - August 15
2. Mow: September 1 (optional)
3. Weed control: mowing should keep annual weeds down; spot spray reed canary grass,
thistle, and other invasive non - native species
F:\WPWR\I\ 1237 -1 Olseedspec.wpd
Establishment - fall seeding
1. Prepare site: late August - early September
- 2. Seed: late September - to freeze -up
Maintenance (following season):
1. Mow (6 -10 inches): June 15 - August 15
2. Mow: September 1 (optional)
3. Weed control: mowing should keep annual weeds down; spot spray reed canary grass,
thistle, and other invasive non - native species
Evaluation:
1. Cover crop growing within 2 weeks of planting (except dormant seedings)
2. Seedlings spaced 1 -6 inches apart in drill rows
3. Native grass seedlings may only be 4 -6 inches tall
4. If there is a flush of growth from foxtail etc., mow more often
Year 2
Maintenance:
I . Mow (6 -10 inches): June l - August 15
2. Mow: September 1 (optional)
3. Weed control: mowing should keep annual weeds down; spot spray reed canary grass,
thistle, and other invasive non - native species
4. Some sites may not require much maintenance the second year
Evaluation:
1. Cover crop will be gone unless winter wheat was used in a fall planting
2. Grasses forming slumps 1 -6 inches apart in drill rows but still short
3. Some flowers should be blooming (Black -eyed Susan, Bergamot, etc.)
4.. If there is a flush of growth of foxtail etc., mow site
Year 3
Maintenance:
1. Mow only if necessary
2. Weed control: spot spray reed canary grass, thistle, and other invasive non - native species
3. Sites usually do not require much maintenance the third year
Evaluation:
1. Planting should begin looking like a prairie - tall grasses, flowers, etc.
FAWPWRK\ 1237- 10\seedspec.wpd
08 QUALITY CONTROL
Plantings will be accepted by the City of Rosemount after inspection at the end of the first
growing season, provided the nurse crop shows a reasonably even distribution and seedlings of
early germinating prairie species are present in a reasonable density.
F: %WF WIN11237- 10\Seedspec.wpd