Lyman Woods Streambank Stabilization PSA 2, Phases 1 and 2%3A Tributary to the East Branch DuPage River%3A Section 319 Project Report

              LYMAN WOODS STREAMBANK STABILIZATION PSA 2,
PHASES 1 AND 2
TRIBUTARY TO THE EAST BRANCH DUPAGE RIVER
Section 319 Project Report
Illinois EPA Agreement No. 3190323
Illinois Environmental Protection Agency
Bureau of Water
Watershed Management Section
December 2007
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 2
LYMAN WOODS STREAMBANK STABILIZATION PSA 2,
PHASES 1 AND 2
TRIBUTARY TO THE EAST BRANCH DUPAGE RIVER
SECTION 319 FINAL REPORT
ILLINOIS EPA FAA # 3190323
December 2007
Prepared For:
ILLINOIS ENVIRONMENTAL PROTECTION AGENCY
BUREAU OF WATER – WATERSHED MANAGEMENT SECTION
1021 NORTH GRAND AVENUE EAST
SPRINGFIELD, IL 62702
Prepared by:
LIVING WATERS CONSULTANTS, INC.
TED R. GRAY, CPESC, P.E.
1 SOUTH 132 SUMMIT AVENUE, SUITE 304
OAKBROOK TERRACE, IL 60181
Ph: 630-261-1133 Fax: 630-261-1144
This report was prepared using United States Environmental Protection Agency funds under Section 319
of the Clean Water Act distributed through the Illinois Environmental Protection Agency. The findings
and recommendations contained herein are not necessarily those of the funding agencies.
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 3
LYMAN WOODS STREAMBANK STABILIZATION PSA 2, PHASES 1 AND 2
TABLE OF CONTENTS
Report Section Page #
Summary 4
Introduction 4
Project Schedule 6
Project Description and Stabilization Techniques 6
Project Costs and Quantities 14
Operation and Maintenance Plan 16
Project Benefits 19
Photos Attachment 1
Press Release Attachment 2
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 4
Summary:
The Downers Grove Park District completed the Lyman Woods Streambank Stabilization
Project, Site Area # 2, Phases 1 and 2. This project will protect against severe streambank
erosion, provide nonpoint source pollution control along Lyman Woods Headwaters, and improve
the water quality of Lacey Creek and the downstream East Branch DuPage River. Installed
stream stabilization techniques have provided effective and environmentally sound bank
protection. The Downers Grove Park District (DGPD) and its agents will provide long-term
maintenance for the project site. Public outreach to date includes numerous staff
environmental education programs for children and adults at the Lyman Woods Interpretive
Center and trial system, a project at the December 2006 Annual Meeting of the Pierce Downers
Heritage Alliance (conservation organization) by Living Waters Consultants, and substantial daily
vehicular traffic along project signage at 31st Avenue east of Highland Avenue.
Introduction:
The Lyman Woods Streambank Stabilization Project Site Area 2 (PSA 2), Phases 1 & 2 includes
over 2,804 linear feet of streambank stabilization and 36 acres of streambank riparian
enhancement along three (3) unnamed streams tributary to Lacey Creek and the East Branch
DuPage River. The project site is located within Lyman Woods, a 150-acre natural area, located
south of 31st Street and east of Highland Avenue in Downers Grove, DuPage County, Illinois.
Most of the site is owned by the Downers Grove Park District but a portion of the area is owned
by the Forest Preserve District of DuPage County. The three streams which have been
stabilized by the project are Streams A, C, and D. Stream D located in the north-central
project site area has a watershed area of 115.4 acres. The watershed is primarily located north
of 31st Street. Land uses in the stream D watershed primarily include Interstate 88 tollway,
commercial land use, and open space. Streams A and C are located in the northwest and west
portions of the project area. The combined watershed area for streams A and C is 38.3 acres.
Stream A flows into Stream C approximately 600 feet east of Highland Avenue. Land uses in
the watershed of streams A and C include single-family residential areas, commercial areas,
roads, and open space. Streambank erosion and channel downcutting is severe on each stream.
Streambank erosion is occurring in part due to upstream watershed development and past road
widening which increases the volume and duration of erosive flows. Other primary causes
include high stream gradient (average slopes up to 2%) and encroachment of invasive Buckthorn
and Honeysuckle. Each stream channel has incised approximately two to three feet into the
landscape. Active channel nickpoints on Streams A and C previously contained vertical grade
separations over 2.5 feet deep. Moreover, significant channel widening had previously occurred.
Several large trees and mature Oaks have previously fallen into the eroding stream channel.
The severe streambank erosion had resulted in significant sediment delivery to the East Branch
of the DuPage River.
A primary objective of the Lyman Woods Streambank Stabilization Project was to improve the
water quality in the project area and to reduce the sediment loading caused by streambank
erosion into Lacey Creek and the East Branch DuPage River. This objective was accomplished in
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 5
Project Site Area # 2 (PSA 2) through streambank stabilization along 2,804 linear feet
including both banks, installation of numerous grade control structures to prevent and control
channel downcutting, removal of invasive shrub species and native plant seeding in 36.06 acres
of riparian area, restoration of 0.22 acres of wetland, and installation of native plantings along
the stabilized streambanks. The completed BMPs will protect against severe streambank
erosion, reduce channel downcutting, provide nonpoint source pollution control along Lacey Creek
and improve water quality of the downstream East Branch DuPage River. The nonpoint source
pollutants that have been controlled include sediment, suspended solids, phosphorus, and
nitrogen. The severe streambank erosion has resulted in significant sediment delivery to the
East Branch DuPage River. The Illinois EPA Load Reduction Spreadsheet was utilized to
quantify the significant sediment delivery to the East Branch DuPage River as described below
under Project Benefits.
Location Map: Wheaton USGS Quadrangle Map.
31st Street and Highland Avenue, Downers Grove, DuPage County, Illinois.
Stream D
Stream C
Stream A
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 6
Project Schedule
Table 1 below indicates the project schedule and completion requirements.
Table 1: Project Schedule.
Lyman Woods Streambank Stabilization PSA 2, Phases 1 and 2.
IEPA FAA 3190323.
Action Item Start Date Completion Date *
FAA 3190323 Award July 16, 2004 Jan. 20, 2008
Design Engineering March 25, 2005 January 25, 2006
Permitting Sept. 15, 2005 February 6, 2006
Bidding May 24, 2006 July 20, 2006
Construction Contract Award July 21, 2006 June 15, 2007
Riparian Invasive Species Removal August 21, 2006 August 25, 2006
Streambank Stabilization Construction August 29, 2006 November 3, 2006
Native Plantings March 15, 2007 May 30, 2007
Project Final Report Dec. 17, 2007 Jan. 17, 2008
* Items in Bold are expected completion dates.
Project Description and Stabilization Techniques
The Lyman Woods Streambank Stabilization PSA 2, Phases 1 and 2 included stream stabilization
design, permitting assistance, stream construction bid documents, and stream construction
observation by Living Waters Consultants, Inc. Project management, riparian invasive species
removal design, wetland restoration design, and permitting were provided by team member
Planning Resources. Hydrologic and hydraulic modeling was provided by team member Patrick
Engineering. The Downers Grove Park District provided administrative assistance,
administrative project management, notification of adjacent landowners, limited construction
observation, and project publicity. Conservation Land Stewardship, Inc. (CLS) provided
construction services. The PSA 2 streambank stabilization substantial completion of
construction ended November 3, 2006. Final planting installations were completed by June 15,
2007. Conservation Land Stewardship, Inc. (CLS) is providing native plant maintenance through
June 15, 2008. Continued native plant maintenance after June 15, 2008 shall be provided by
contractors to be named later, to be hired by the Downers Grove Park District. The best
management practices described below were utilized to enhance the riparian corridor and to
stabilize the streambanks of the Lyman Woods Headwaters streams A, C and D.
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 7
Table 2: Streambank Stabilization Practices.
Streambank Stabilization Quantities for Pollutant Loading
Rates
Left
Bank
Right
Bank Total
Stabilization Practice (LF) (LF) (LF)
Native Shrub Live Stakes Only (3/LF) 35 0 35
Native Potted Plugs Only (3/LF) 35 50 85
Fiber Roll Toe 108 125 233
Cobble Installation At Storm Pipe Inlets 24 27 51
Rock Check 12 48 60
Rock Vortex Weirs 28 28 56
Rock Vanes 28 28 56
Re-Shaped Slope Only 50 0 50
Tree Rootball 24 8 32
Vegetated Cobble Toe 170 175 345
Widen Bank Only 0 55 55
Stepped Pool 160 160 320
Cabled Shrub Revetment 0 20 20
Fiber Roll Terrace (mid-slope) 25 70 95
Rock Riffles 360 360 720
1-Row A-Jacks / Rock Layer 331 180 511
Lunkers / Rock Layer 0 80 80
Total (LF) 1390 1414 2804
Note: 1) Lengths of BMPs depicted above do not overlap with other BMPs.
2) Total quantities are higher than that depicted. For instance,
Rock J-hook 15 LF coincided with Lunkers. To avoid double-counting
BMP lengths, rock J-hooks were not omitted from pollutant loading
calculations.
Enhancement of Riparian Corridor
Lyman Woods Headwaters Streambank Stabilization included vegetation management with
replacement of 36 acres of dense stands on non-native and invasive shrubs and trees (such as
Buckthorn and Honeysuckle) with riparian native plant seeding, and limited installation of potted
native trees and native potted shrubs. The replacement of undesirable vegetation with native
species will prevent loss of bank soils and promotes bank stability. Removal of invasive species
will also significantly enhance growth of native grasses, forbs, shrubs and trees which previously
were suppressed by invasive plants. This will reduce non-point source pollutant loadings to the
downstream East Branch DuPage River. Replacement of invasive species with native grasses,
forbs, shrubs and trees will also promote filtration and assimilation of nutrients as well as
contaminated runoff that can be discharged from surrounding upland areas. Aquatic habitat
diversity along the Lyman Woods Headwaters riparian corridor will be substantially improved.
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 8
A-Jacks / Rock Layer and Vegetated Geogrid
Streambank stabilization was the most important BMP to prevent additional soil pollutant
transport throughout the Lyman Woods Headwaters and the downstream East Branch DuPage
River. In the more severely eroded areas, a-jacks were installed in a trench along the toe of
slope and a rock layer was installed above the a-jacks. Above the rock layer, the steeply eroded
banks were stabilized by constructing soil-encapsulated lifts using permanent erosion control
blanket (NAG C350). The permanent A-Jacks structures have a high energy-dissipation
capability. The vegetated geogrid provided long-term erosion control along banks that were
typically 4-ft to 5-ft tall with vertical slopes (H:V). These techniques were suited for areas
that could not be stabilized with vegetation alone, such as areas with high flow velocities along
erodible soils, and where high bank shear stresses and sharp meander bends occur.
Lunkers / Rock Layer and Vegetated Geogrid
Lunkers were used in the tallest and most severely-eroded bank at the project site. Lunkers
composed of TREX material were installed in a trench along the toe of slope and a rock layer
was installed over the lunkers. Above the rock, the steeply eroded banks were stabilized by
constructing five rows of soil-encapsulated lifts using permanent erosion control blanket (NAG
C350). The lunkers have a high capability to protect the toe of a steep overlying bank and they
can resist washout due to installation of rebar through the lunkers into the subgrade. The
vegetated geogrid provided long-term erosion control along a bank which was 8-feet high and
vertical in slope. This bank also contained a 90-degree meander bend. The site previously had
become so eroded that several trees fell into the stream channel including a 30-inch diam. oak
tree. The stabilized bank was constructed at a slope of approximately 2.25:1 to 2.5:1 (H:V).
Rock J-Hooks
Three rock j-hooks were installed along the 90-degree meander bend described under “Lunkers
/ Rock Layer and Vegetated Geogrid” above. The rock j-hooks will help to deflect flows away
from the severely eroded bank described above towards the center of the stream channel. The
rock j-hooks will help to dissipate excess stream energy and reduce extremely high erosive
forces against the streambanks.
Vegetated Rock Toe, and Vegetated Geogrid or Re-Shaped Slopes
In other severely eroded areas, a rock toe was installed for streambank protection. Although
the rock toe does not provide a high energy-dissipation capability, it was utilized not only to
deflect flows away from the eroding banks, but also to provide sufficient mass at the base of
the slope to protect against slumping and sliding of saturated bank soils. Above the rock toe,
the streambanks were stabilized by either constructing vegetated geogrid or by re-shaping the
bank to a stable slope. Vegetated geogrid was constructed above the rock, by wrapping soil in
soil-encapsulated lifts using permanent erosion control blanket (NAG C350). Re-shaped slope
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 9
areas were typically graded to 3:1 (H:V) or flatter, seeded and planted using native vegetation
(described below), stabilized with erosion blanket (NAG C150-BN).
Fiber Roll Toe / Fiber Roll Terrace, and Re-Shaped Slopes
Streambanks exhibiting moderate erosion were stabilized by re-shaping bank slopes, installing
native plant seed and plugs, erosion control blanket, and providing toe stabilization using coconut
(coir) fiber roll. In other locations with taller banks, a fiber roll terrace was constructed by
placing fiber roll in a shallow trench at mid-slope. Plant communities were enhanced by removing
the non-native / invasive vegetation, as well as introducing rooted plant materials.
Tree Rootball, and Cabled Shrub Revetment
Tree rootballs were installed in moderately eroded areas to deflect flows away from eroding
banks. The tree rootballs will increase channel roughness and reduce erosive flow velocities.
Tree rootballs also improve aquatic habitat diversity by adding course woody debris. Dense
cabled shrub revetments were installed in an undercut bank area to reduce flow velocities in the
bank undercut and to filter and promote settling of silt and coarse aggregate materials at the
eroded area.
Rock Riffle Structures and Stepped Pool Structures
Control and prevention of channel downcutting was a critical component of project success. A
primary process occurring on each stream channel was severe downcutting. Downcutting
contributed to significant steepening of banks and severe streambank erosion. Therefore,
control of downcutting was critical for long-term bank stabilization. Severe downcutting has
been controlled through the installation of rock riffle and stepped pool grade control
structures. The constructed riffles and stepped pools not only control and prevent further
channel downcutting but also dissipate excess stream energy and reduce extremely high erosive
forces against the streambanks. Materials utilized ranged from 0.5-inch subsurface gravel to
18-inch surface boulders. The rock riffle and stepped pool structures also diversify and
improve in-stream habitat, improve fish passage opportunities throughout the project site,
diversify stream substrate materials, and enhance aesthetics.
Rock Vane, Rock Vortex Weir, Rock Checks
Moderately downcut areas were stabilized with the installation of rock vanes, rock vortex weirs,
and/or rock checks. Rock checks were constructed exclusively in eroded side-channel gully
areas. Rock checks will facilitate gully stability and accumulation of soil particles to promote
growth of native vegetation in the gully area. Rock vanes and rock vortex weirs were installed
along the mainstem of each stream channel. The constructed grade control structures not only
control and prevent moderate channel downcutting but also dissipate excessive stream energy
and reduce erosive forces against the streambanks. Materials utilized ranged from 0.5-inch
subsurface gravel to 18-inch surface boulders. The rock weir and rock vane grade control
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 10
structures also diversify and improve in-stream habitat, improve fish passage opportunities
throughout the project site, diversify stream substrate materials, and enhance aesthetics.
Rock Placement At Storm Pipe Outfall
Existing culvert inlets across Highland Avenue (Stream A) or 31st Street (Stream D) were
stabilized with the placement of rock. Downstream of each culvert, a plunge pool occurs where
high-velocity flows discharge into the stream channel. Rock placement will protect culvert
infrastructure, increase channel roughness to reduce erosive forces, and protect adjacent
banks from severe erosion.
Re-Shaped Slope / Native Plantings
Areas exhibiting low erosion were stabilized by re-shaping bank slopes, seeding and planting with
native vegetation, and installing erosion control blanket. Plant communities were improved by
removing the non-native / invasive vegetation, as well as introducing rooted plant materials.
Native plantings will provide improved stability through establishing deeper root systems.
Native Plantings
Proper selection and installation of native plantings and seed is instrumental to project success.
Native seed and plantings were installed along all stabilized streambank areas. Effective native
plant installations improve long-term streambank stabilization, pollutant filtration, wildlife
habitat, dissipation flow energy, and improvement of site aesthetic values. Native plant seed
and plug lists are provided in Tables 3 and 4 below. Native shrub live stakes (cut live stems) are
intended for shaded areas or areas with high erosive forces (Table 5). Limited installation of
ball-and-burlap tree and shrub species are described in Table 6.
Table 3. Native Herbaceous Plant Plugs Species List.
Type 1 (Shoreline) Native Plant Plugs
Scientific Name Common Name Percent Of Total
Acorus calamus sweet flag 8%
Asclepias incarnata marsh milkweed 4%
Aster novae-anglia New England aster 4%
Aster simplex marsh aster 2%
Carex cristatella crested oval sedge 5%
Carex stipata common fox sedge 5%
Carex tribuloides awl-footed oval sedge 6%
Carex vulpinodea fox sedge 5%
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 11
Elymus canadensis Canada wild rye 6%
Elymus virginicus Virginia wild rye 6%
Iris virginica blue flag iris 10%
Juncus torreyi torrey's rush 3%
Leersia oryziodes rice cutgrass 4%
Panicum virgatum switchgrass 12%
Scirpus atrovirens dark green rush 4%
Scirpus cyperinus wool grass 3%
Spartina pectinata prairie cord grass 10%
Verbena hastata blue vervain 5%
100%
Type 2 (Middle / Upper Bank) Native Plant Plugs
Scientific Name Common Name Percent Of Total
Allium cernuum nodding wild onion 3%
Aquilegia canadensis columbine 3%
Aster cordifolius heartleaved blue wood aster 2%
Aster lateriflorus side-flowering aster 3%
Aster novae-anglia New England aster 3%
Ceanothus americanus New Jersey tea 3%
Echinacea purpurea purple coneflower 7%
Elymus canadensis Canada wild rye 6%
Elymus virginica Virginia wild rye 7%
Eupatorium perfoliatum boneset 8%
Eupatorium purpureum sweet joe-pye weed 7%
Geranium maculatum wild geranium 3%
Helianthus strumusus sunflower 2%
Lobelia cardinalis cardinal flower 6%
Lobelia siphilitica great blue lobelia 5%
Monarda fistulosa bergamot 3%
Panicum virgatum switch grass 9%
Parthenium integrifolium quinine 3%
Penstemon calycosus smooth penstemon 3%
Solidago gigantea goldenrod 3%
Solidago speciosa showy goldenrod 6%
Tradescantia ohiensis spiderwort 3%
Trillium recurvatum trillium 2%
100%
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 12
Table 4. Native Plant Seed List.
Type 1 (Shoreline) Native Plant Seed (35 lb/acre)
Scientific Name Common Name lb/acre
Aster laevis smooth aster 5%
Aster novae-angliae New England aster 5%
Aster simplex marsh aster 5%
Andropogon gerardii big bluestem 5%
Carex comosa bristly sedge 6%
Carex sparganoides burred sedge 5%
Carex stipata common fox sedge 5%
Carex vulpinoidea fox grass 5%
Elymus canadensis Canada wild rye 5%
Elymus virginicus Virginia wild rye 5%
Gentiana andrewsii bottle gentian 5%
Juncus torreyi torrey's rush 7%
Monarda fistulosa bergamot 5%
Panicum virgatum switch grass 8%
Rudbeckia hirta black-eyed susan 8%
Solidago gigantea goldenrod 7%
Sorghastrum nutans indian grass 3%
Spartina pectinata prairie cord grass 6%
100%
(35 lb/acre)
Type 2 (Middle / Upper Bank) Native Plant Seed (35 lb/acre)
Scientific Name Common Name lb/acre
Allium cernuum nodding wild onion 5%
Andropogon gerardii big bluestem 6%
Aquilegia canadensis columbine 5%
Aster cordifolius heart-leaved blue aster 5%
Aster laevis smooth aster 5%
Aster novae-angliae New England aster 5%
Cassia fasciculata partridge pea 5%
Echinacea purpurea purple coneflower 7%
Elymus canadensis Canada wild rye 5%
Elymus virginicus Virginia wild rye 7%
Eupatorium perfoliatum boneset 6%
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 13
Monarda fistulosa bergamot 3%
Panicum virgatum switch grass 7%
Phlox divartica blue phlox 7%
Ratibida pinnata yellow coneflower 5%
Rudbeckia hirta black-eyed susan 8%
Solidago gigantea goldenrod 5%
Solidago speciosa showy goldenrod 5%
Veronica fasciculate ironweed 3%
100%
(35 lb/acre)
Table 5. Native Shrub Live Stakes.
Scientific Name Common Name Percent Of Total
Cephalanthus occidentalis button bush 15%
Cornus stolonifera red-osier dogwood 20%
Cornus racemosa gray dogwood 15%
Salix interior sandbar willow 20%
Sambucus canadensis elderberry 15%
Viburnum lentago nannyberry viburnum 15%
100%
Table 6. Potted Native Trees and Shrubs.
Scientific Name Common Name
Trees (5-gallon)
Gymnocladus dioica Kentucky coffee tree
Juglans nigra Black walnut
Quercus bicolor swamp white oak
Tilia americana American linden
Shrubs (3-gallon)
Cornus obliqua blue-fruited dogwood
Cornus stolonifera red-osier dogwood
Rosa palustris Swamp rose
Salix discolor pussy willow
Sambucus canadensis elderberry
Spirea alba Meadowsweet
Viburnum lentago nannyberry viburnum
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 14
Project Costs and Quantities
A summary of quantities and costs are listed below.
Table 7: Summary of Quantities and Prices.
Conservation Land
Stewardship
Item Item Description Quantity Units Unit Cost Extended Cost
Grade Control
1 Rock Vortex Weirs 4 EA $ 2,700.00 $ 10,800.00
2 Rock Riffles 16 EA $ 4,950.00 $ 79,200.00
3 Rock Vanes 6 EA $ 2,950.00 $ 17,700.00
4 Rock Check 10 EA $ 550.00 $ 5,500.00
5 Stepped Pool 12 EA $ 3,100.00 $ 37,200.00
6 Rock J-Hook 5 EA $ 1,550.00 $ 7,750.00
Toe Stabilization
7 Fiber Roll 205 LF $ 30.00 $ 6,150.00
8 Lunkers / Rock Layer 141 LF $ 270.00 $ 38,070.00
9 1-Row A-Jacks / Rock Layer 550 LF $ 130.00 $ 71,500.00
10 Vegetated Cobble Toe (Avg. 0.20 CY Rock per LF) 385 LF $ 70.00 $ 26,950.00
11 Cabled Shrub Revetment 20 LF $ 186.00 $ 3,720.00
12 Cobble Installation At Storm Pipe Inlets 6.49 CY $ 75.00 $ 487.00
13 Grout Rock Layer Surface at Lunkers 85 LF $ 16.00 $ 1,360.00
Bank Protection
14
Vegetated Geogrid (w/ Re-Shape Slope Above
Geogrid) 931 LF $ 110.00 $ 102,410.00
15
Vegetated Geogrid & Strata Grid 200 (w/ Re-Shape
Slope Above Geogrid) 425 LF $ 175.00 $ 74,375.00
16 Re-Shaped Slopes 1533 LF $ 39.00 $ 59,787.00
17 Fiber Roll Terrace (mid-slope) 145 LF $ 28.00 $ 4,060.00
Work By Hand on Stream D Station 2+50
18 Cabled Brush Revetment 60 LF $ 185.00 $ 11,100.00
Native Plantings
19 Native Shrub Live Stakes (3 / LF) 35 LF $ 20.00 $ 700.00
20 Native Shrub Live Stakes 143 SF $ 3.00 $ 429.00
21 Native Potted Plugs (3 / LF) 50 LF $ 13.00 $ 650.00
Other Habitat
22 Boulder Placement (18" to 24") 29 EA $ 120.00 $ 3,480.00
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 15
23 Tree Rootball 5 EA $ 760.00 $ 3,800.00
24 Cabled Log Placement (no excavation) 10 EA $ 220.00 $ 2,200.00
Tree / Debris Removal
25
Tree Trimming / Limb Removal (Relocate limbs
onsite) 2 EA $ 4,800.00 $ 9,600.00
26
Tree & Log Removal Near Stream Channel
(Relocate onsite)
27 < 6" diam. 7 EA $ 40.00 $ 280.00
28 6" to 12" diam. 19 EA $ 160.00 $ 3,040.00
29 12" to 24" diam. 11 EA $ 300.00 $ 3,300.00
30 24" + diam. 2 EA $ 600.00 $ 1,200.00
31 Woody Debris Removal 14 CY $ 80.00 $ 1,120.00
Other Excavation
32 Widen Channel Bottom (Widen to 8' Bottom Width) 345 LF $ 23.00 $ 7,935.00
33
Widen Bank 6 ' Starting 1' Above Channel Bottom /
Re-Shape Slope 125 LF $ 15.00 $ 1,875.00
34 Pool Excavation 3 EA $ 715.00 $ 2,145.00
Miscellaneous
35 Erosion Control 1 LS $ 5,950.00 $ 5,950.00
36 Construction Access Restoration 1 LS $ 12,800.00 $ 12,800.00
37 As-built survey 1 LS $ 9,000.00 $ 9,000.00
38 Japanese Knotweed Removal 1 LS $ 850.00 $ 850.00
39 Wetland Restoration Area (0.22 ac) 700 LS $ 3.50 $ 2,450.00
40 Native Seeding (33.82 ac) 36.06 LS $ 825.00 $ 29,750.00
41 1Year Maintenance of all Native Plant Material 1 LS $ - $ -
42 Furnish materials and install Boardwalk 1 LS $ 30,181.82 $ 30,181.82
42a Additional Clearing 1 LS $ 11,318.18 $ 11,318.18
43
Contractor agrees to an Allowance of $22 Linear
Feet for subgrade undercuts. Yes or No Yes
44 Administrative 1 LS $ 29,816.00 $ 29,816.00
45 Difference 1 LS $ 460.00 $ 460.00
CO-1 Cable Gate 1 LS $ 864.29 $ 864.29
CO-1 Gravel Entrance 1 LS $ 582.69 $ 582.69
CO-1 Native Shade Tree 1 LS $ 3,352.00 $ 3,352.00
CO-1 Native Shrub 1 LS $ 1,531.01 $ 1,531.01
GRAND TOTAL $ 738,778.99
Total Contractor Costs: $738,778.99
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 16
Table 8: Project Cost Summary.
Lyman Woods Streambank Stabilization PSA 2, Phases 1 and 2.
IEPA FAA 3190323.
Project Cost Summary Total Cost Match Amount Assistance
Amount
DIRECT LABOR $0.00 $0.00 $0.00
Fringe Benefits $0.00 $0.00 $0.00
Overhead Costs $0.00 $0.00 $0.00
INDIRECT COSTS $0.00 $0.00 $0.00
$0.00 $0.00 $0.00
$0.00 $0.00 $0.00
EQUIPMENT, MATERIALS, SUPPLIES $0.00 $0.00 $0.00
Planning Resources / Living Waters Consultants $113,798.25 $113,798.25 $0.00
Streambank Stabilization by Contractor $738,779.99 $582,345.99 $156,434.00
SUBCONTRACTS $852,578.24 $696,144.24 $156,434.00
Totals $852,578.24 $696,144.24 $156,434.00
Operation and Maintenance Plan
Maintenance of native plantings along the stabilized streambanks and within the riparian
corridor is critical to project success. The Downers Grove Park District will take responsibility
for the EPA Section 319 grant 10-year Operations & Maintenance agreement for streambank
bioengineering protection measures and plant maintenance.
Grade Control, Biotechnical, and Bioengineering Materials Inspections
Bioengineering materials inspections for the constructed streambank stabilization area will
occur at least once per year. Repairs will be made as necessary, as determined by the Owner
and their designated Representative.
1. Lunkers: Inspections will occur for structural integrity of lunker materials, dislodgement or
relocation of rock, if any, or other indications of potential stabilization concerns. According
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 17
to the manufacturer, TREX lunker materials are anticipated to maintain structural integrity
for a minimum of a few decades.
2. Rock toe, a-jacks toe: Inspections will occur for dislodgement or relocation of a-jacks or
rock, if any, or other indications of potential stabilization concerns.
3. Fiber Roll: Inspections will occur for the staking, undercutting, cord fasteners, and integrity
of the Fiber Roll.
4. Rock riffles, stepped pools, rock J-hooks, rock vortex weirs, rock vanes, rock check dams:
Some rock displacement is expected, but significant relocation of larger rock materials is not
desirable. Major relocation of rock will be inspected and noted.
5. Cabled shrub revetment and Tree Rootballs: Stability of the structures and adjacent re-shaped
slopes will be inspected. Desirable silt accumulations will be evaluated. Relevant
growth of vegetation will be inspected.
6. Re-Shaped Slopes: The performance of the re-shaped slopes to stabilize the site slopes will
be inspected. Growth of vegetation and locations requiring additional planting will be
inspected. The permanent vegetated geogrid is expected to last several years. The
capability of plantings to stabilize the resulting angle of repose will be noted.
Native Plant Maintenance
Native plant maintenance will occur using spot herbicide applications, hand removal of nuisance
weeds, and related activities performed at least three times per year per the attached
schedule.
Costs
We estimate that the annual site maintenance budget will be approximately $12,000 annually,
primarily to control re-introduced invasive species such as Buckthorn (Rhamnus cathartica), and
Tartarian Honeysuckle (Lonicera tatarica) from taking over the newly establishing native plants.
Expenditures may be higher expenditures during the first three years for native plant
maintenance and nuisance weed control as the native plantings become established. Costs for
Operations and Maintenance shall be paid by the Owner, the Downers Grove Park District.
Responsibilities
The coordinating party shall be the Downers Grove Park District and their designated
Representative. Participating parties will include the Owner’s Representative, and professional
Contractor services support.
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 18
Table 9. Site Maintenance Schedule.
Key to Coordinators and Participants:
Downers Grove Park District = "DGPD"
Consultant = "CT"
Landscape Contractor = "LC"
Volunteers = "VL"
2006
Coordinator Participants Activity
early
April
early
June
mid-
July
mid-
August
DGPD & CT CT, LC, VL Site Construction / Native Plant Installation X
DGPD & CT CT, LC, VL Spot Herbicide / Remove Weeds X
DGPD & CT CT, LC, VL Bioengineering Materials Inspection X
2007
Coordinator Participants Activity
early
April
early
June
mid-
July
mid-
August
DGPD & CT CT, LC, VL Completion of Native Plant Installation X X
DGPD & CT CT, LC, VL Weed-whip and Cut Natives (see Notes) X
DGPD & CT CT, LC, VL Spot Herbicide / Remove Weeds X X X
DGPD & CT CT, LC, VL Bioengineering Materials Inspection X X
2008 - 2016 (ongoing)
Coordinator Participants Activity
early
April
early
June
mid-
July
mid-
August
DGPD & CT CT, LC, VL Burn Management for Riparian Area X
(See areas to avoid burn in Notes below)
DGPD & CT CT, LC, VL Weed-whip and Cut Non-Burn Areas X
DGPD & CT CT, LC, VL Spot Herbicide / Remove Weeds X X
DGPD & CT CT, LC, VL Bioengineering Materials Inspection X
Notes:
1. Herbicides shall include Poast, Roundup, Rodeo (near water), and/or other approved herbicides as conditions allow,
applied by a USDA-licensed applicator.
2. Burn management shall occur in addition to herbicide applications as conditions allow, likely beginning 3 years after
project installation. Burn management directly along streambanks shall only be allowed in spring (no fall burning)
to protect against streambank erosion. Under no circumstances shall burn management be allowed where
permanent erosion blanket occurs, including locations with vegetated geogrid. Where burn management cannot
occur, or if burn management is not effective, weed-whipping and cutting shall occur annually.
3. Cutting and Mowing of Native Plants should include removal of clippings from the site.
4. No herbicide or pesticide spraying is allowed in critical wetland areas, near T/E species, or the Prairie Kame.
Responsibilities
The Downers Grove Park District Board and their designated Representative shall be
responsible for project site maintenance. Participating parties will include the Owner’s
Representative, and professional Contractor services support.
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 19
Project Benefits
Water Quality
Observations since 2006 indicate a growing establishment of temporary cover crop and native
plantings following slope stabilization and planting. The banks remained protected and erosion
was greatly reduced. The site was also inspected by the author after the floods of August
2007. Stream stabilization did not appear to be significantly affected by the flood events.
Selected replacement of invasive trees and shrubs with native species in the 36-acre riparian
area will also substantially reduce the loss of bank soils and promote bank soils stability. Native
riparian plantings will reduce sheet erosion and mass wasting within the flood zone. This will
significantly reduce non-point source pollutant loadings to the downstream East Branch DuPage
River.
The Illinois EPA Load Reduction Spreadsheet was used to calculate pollutant loading rates from
the project site. Input data included a combined streambank (left and right bank) length of
2,804 linear feet (see Table 2). The project site had previously contributed approximately 222
tons of sediment, 222 pounds of phosphorus, and 445 pounds of nitrogen annually to Lacey Creek
and the East Branch DuPage River. These estimates do not include historic sediment loss due to
severe channel downcutting which has also occurred at this site. Due to stream stabilization,
these pollutant loading rates to Lyman Woods Headwaters have been virtually eliminated at the
project site.
Habitat and Riparian Function
• Selected removal of invasive species will allow more desirable and beneficial species to
flourish. There were numerous impacts to ecological integrity caused by the previously
existing invasive plant species in the riparian zone. Dense stands of invasive shrubs such as
common buckthorn and Tartarian honeysuckle previously shaded and out-competed growth of
seedlings of bur oak (Quercus macrocarpa). Riparian enhancement will increase sunlight
penetration and increase the density of desirable tree and shrub species.
• The proposed riparian planting enhancement will enhance the function of interception of
rainfall. Deep-rooted trees and plants have increased absorption properties over the
existing riparian species.
• Replacement of invasive riparian plant species with native forbs, grasses, as well as trees and
shrubs will enhance pollutant filtration and assimilation of nutrients as well as contaminated
runoff discharged from surrounding upland areas, or through the project site. Native
groundcover such as grasses and forbs are particularly efficient at trapping sediment in the
uptake of phosphorus and nitrogen nutrients which otherwise cause pollution within the
waterway. The proposed planting plan will significantly increase the abundance of
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 20
groundcover species. Deep-rooted native plant species will increase the uptake of nitrogen
from shallow groundwater, improving water quality of the stream.
Public Outreach / Education
• Project Signage (per project plans) placed at 31st Avenue is being utilized to notify
motorists, pedestrians, and visitors regarding the project, funding sources, and proposed
improvements and activities. It is estimated that thousands of motorists and passersby
can view the Project Sign on a daily basis.
• The Downers Grove Park District operates the Interpretive Center at Lyman Woods
immediately adjacent to the project site. This modern facility is used by the DGPD
Manager of Natural Resources and Interpretive Services, Shannon Forsythe, to offer
over 100 educational programs to approximately 2000 children and adults each year.
Many of these tours include discussion of stream stabilization and wetland restoration
provided by the completed project. For instance, over the last few years, DGPD had
incorporated a stream table model and a hike in the 5th grade Wetlands Education
Program. All 5th grade students in the local school district had attended the program and
hike the stream area each year.
• Press releases regarding completion of the project have occurred in local newspapers.
• A project presentation was provided by the author at the December 6, 2006 Pierce
Downers Heritage Alliance Annual Meeting (conservation organization). This meeting had
perhaps 80 attendees, and it was also attended by several DGPD staff, DGPD Board
members, and members of the Forest Preserve District of DuPage County.
• The Downers Grove Park District Board of Trustees had regularly convened and
discussed the completed project in 2006 and 2007 in public meetings. These proceedings
were televised on the local cable television programming.
• The Downers Grove Park District monitors all of Lyman Woods and works with volunteers
and residents including Pierce Downers Heritage Alliance (PDHA) which is particularly
active in protecting and monitoring Lyman Woods.
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 21
ATTACHMENT 1: PROJECT PHOTOS
Lyman Woods Streambank Stabilization, PSA 2, Phases 1 and 2 Section 319 Final Report 22
ATTACHMENT 2: PRESS RELEASE