the proposed activity complies with illinois’ …application for a federal consistency certificate...

AECOM 312.373.7700 tel 303 East Wacker Drive, Suite 1400 312.373.6800 fax Chicago, IL 60601-5276 www.aecom.com

P:\60600180\400_Technical\431_Permits\01_Permit Applications\Joint Permit Application\IDNR\Letter Of Consistency Submittal\Consistency Determination_02 21 2018.docx

August 8, 2019 Mr. James Casey Illinois Department of Natural Resources Office of Water Resources Lake Michigan Management Section 160 N. LaSalle Street Suite # S-700 Chicago, IL 60601 RE: Proposed Bluff Stabilization and Shoreline Protection Structure Lake Michigan at 633 Circle Lane, Lake Forest, Illinois Application for a Federal Consistency Certificate for Slope Stabilization AECOM Project No. 60600180 IDNR Permit No. C20190012 Dear Mr. Casey, This application provides detailed information in support of a federal consistency determination for a bluff stabilization and shoreline protection structure at 633 Circle Lane in Lake Forest, Illinois. The residential property at the above referenced address has experienced significant bluff failures. The permit report included with this letter of consistency determination provides additional information on the project and includes a location map and the proposed project plans. The project construction will begin as soon as permits are received which is anticipated in a month or so from now, and completion is expected during spring 2020. The proposed activity complies with Illinois’ approved coastal management program and will be conducted in a manner consistent with such policies. The conditions of the Illinois Coastal Management Program will be satisfied in considering the following:

• A joint permit has been submitted to IEPA, IDNR, as well as the Army Corps of Engineers.

• The minimum amount of stone fill will be placed to achieve a stable slope.

• Stone fill will consist of clean quarry stone and water quality will not be degraded.

I am the agent for the property owner and my contact information follows: Bill Weaver, AECOM,

303 E. Wacker Drive, Chicago, Ill 60601. If you have any questions regarding this application,

please contact Bill Weaver at .

Sincerely,

William J. Weaver, PE, D.WRE Senior Principal Engineer – Vice President ©AECOM 2019, ALL RIGHTS RESERVED

AECOM 312.373.7700 tel

303 East Wacker Drive, Suite 1400 312.373.6800 fax

Chicago, IL 60601-5276

www.aecom.com

April 25, 2019 Mr. Soren Hall Ms. Kathleen Chernich, Chief – East Section Senior Project Manager U.S. Army Corps of Engineers U.S. Army Corps of Engineers Chicago District Regulatory Branch Chicago District Regulatory Branch 231 South LaSalle Street 231 South LaSalle Street Suite 1500 Suite 1500 Chicago, IL 60604 Chicago, IL 60604 Mr. James Casey Mr. Darren Gove Illinois Department of Natural Resources Illinois Environmental Protection Agency Office of Water Resources, Lake Michigan Section Division of Water 160 N LaSalle Street, Suite S-703 1021 North Grand Avenue East Chicago, IL 60601 Springfield, IL 62794 Subject: Proposed Shoreline Restoration

Lake Michigan at 633 Circle Lane, Lake Forest, Illinois Section 404/401, Section 10, and IDNR Navigable Waterway Permit Application Army Corps Project No. LRC-2019-208

AECOM Project No. 60600810

Cathy, Soren, Jim and Darren, This letter provides information that supports the attached permit application for the proposed bluff stabilization and shoreline protection structure at 633 Circle Lane, Lake Forest, Illinois. If you have any questions regarding this permit report, please contact Mr. William Weaver at 3-

. Sincerely,

Samuel Shaffer William J. Weaver, P.E., D.WRE Project Engineer Vice President – Sr. Principal Engineer Attachments: Joint Application Form Permit Application Report Attachment A – Neighboring Property Owners Mailing Labels Attachment B – Project Plans Attachment C – Lakefill Area & Volume Calculations

AECOM Permit Application Proposed Beach and Shoreline Stabilization 2 633 Circle Lane, Lake Forest, Illinois

\\uschg1fs001\prod\Projects\60600810\400_Technical\431_Permits\01_Permit Applications\Joint Permit Application\Richmond Permit Application Letter Report 04_ 18_ 2019.doc

1.0 Project Introduction and Setting

This project consists of a stone revetment at the toe of slope, crushed stone fill and regrading of the bluff

to a stable slope. The design includes the construction of 290 feet of new revetment along Lake Michigan

at 633 Circle Lane in Lake Forest, Illinois. Loss of existing table land due to regrading of bluff amounts to

approximately 30 feet for approximately 240 feet along the top of slope. The proposed bluff slope includes

one stability/transition bench near the bottom of the slope and one stability/drainage bench near the top of

slope. Access along the lakefront is preserved by placing flat armor stones at the south end of the

property. A location map for the project site is provided on Figure 1. This report summarizes the design

and includes an alternatives analysis.

Figure 1 - Location Map

The parcel has 190 feet of lakefront. Its slope is in the process of active and aggressive slope failure with

slopes generally in the range of 1.2H:1V. Analysis indicates that this slope does not meet normal slope

stability factors of safety against failure. Significant evidence of slope creep and slips exists in this zone.

The failures have included a combination of undermined clay block slides and more broad based

landslides. The causes vary including seepage in sand seams, loss of the slope toe due to erosion, and

structural instability due to the steepness of the slopes. All vegetation is gone from this slope due to the

extent of the failure. The concave shaped shoreline that has formed as a result of the aggressive erosion

also contributes to failure in this area as wave attack includes a combination of direct and reflected wave

energy that focuses in this area. Existing slope conditions are shown in Figure 2.

The new restoration design intends to improve the slope stability. The shoreline will be straightened to

address the wave focusing issue. The design will manage the wave attack at the toe of slope and preserve

Project Location



and supplement the lakebed counterweight in that area. The slope will continue to be subjected to periodic

creep movements as is typical of this type environment; however, the risk of significant failures will be

significantly diminished.

Figure 2 - 633 Circle Lane Existing Slope Photos

The bluff is comprised primarily of clay glacial till with sand seams present high up on the slope. The clay

allows the slopes to stand up at very steep slopes for a time until toe erosion causes sudden blocky

failures of the clay. The sand seam zones tend to fail immediately when clay soil losses occur at lower

elevations. These bluff soils usually start to move when the natural slopes are steeper than a 2H:1V slope

ratio. As the toe of slope continues to be lost, the erosion scarp will increase in height and the pace of

erosion will increase. The north parcel has experienced creep movements over time. This is due to steep

slopes that approach and exceed 1.2H:1V in places. Aerial photography reveals how rapidly this bluff has

eroded in the last four years. The toe of the bluff has moved 30 to 50 feet in recent years. The lakefront

bluff heights at this property reach 70 feet high and much of the bluff slope is now near vertical in areas.

The proposed slope restoration includes the construction of a stone revetment system. The project

includes the restoration of the slopes to a stable condition, and the management of wave attack at the toe

of slope to maintain the restored slope condition. The shoreline will also be straightened out to eliminate

the focusing of wave energy in the existing concave shape that has resulted from the erosion process,

geology, and variable nature of shoreline conditions in the area. Proposed drawings are provided in

Attachment B.



2.0 Development of Shoreline and Bluff Protection Alternatives

The project is “water dependent” because it includes activities that cannot be completed without filling

along the lakefront. The unstable bluff slope is very steep. This design provides protection for the bluffs

which are very steep and extend for a vertical distance of 70 feet above the lake level. Following is a

summary of alternatives considered for this project:

• Option 1: No Action – If the failing beach and bluff slopes are not addressed, the bluff will continue

to erode depositing significant amounts of sediment into Lake Michigan. Property damage will

continue and expand over time. This erosion will be progressive and accelerate over time into

adjacent areas. The “no-action” alternative is considered not feasible for this site.

• Option 2: Construct a stone revetment at the toe of slope and regrade the bluff to a stable slope –

An armor stone revetment will be constructed for the entire length of the shoreline. Following are

the features that comprise this option:

o This option provides a stable stone toe structure that is large enough and high enough to

stop toe erosion.

o The slope will be reconstructed with a slope that brings the stability to an acceptable

factor of safety against failure. This design will cause the loss of existing table land

amounting to about 30 feet for 240 feet of the top of slope on this parcel.

o The slope regrading will straighten out this portion of the shoreline that is currently

concave shaped. This feature will reduce the wave focusing that is occurring at present.

o Access along the lakefront is preserved in this design by placing flat armor stones at the

south end of the property.

o Option 2 would result in the placement of 0.33 acres stone on the lakebed below the

mean and ordinary high water mark.

• Option 3: Restoration options that cause the loss of more tableland than that lost under Option 2 –

We evaluated restoration options that would cause the loss of more tableland than Option 2. We

have evaluated the feasibility of losing more table land and reducing the amount of lakefill

associated with Option 2. This approach would be unfeasible for the following reason:

o This would cause a 3 dimensional slope stability problem because the slope at the project

site would then reside much farther west than the existing slope on the property to the

south. The graded land transitions on the north and south limits of the south parcel have

to transition in to the existing ground elevations at the north and south properties.

Therefore, ground slopes at a ratio of 2H:1V would need to be provided to the south, east

and west in the concaved shaped excavation. The tableland at the south and north limits

of the property cannot be moved at all without pulling the slopes back on these parcels –

otherwise a vertical transition occurs which is not possible. The slopes on the adjacent

property to the south are owned by others and cannot be disturbed. The north parcel

cannot be disturbed because that parcel is fully developed.

The proposed slope grading in option 2 includes some table land losses. The resultant slope will

fit in with the adjacent slopes and form a straight lakefront water’s edge. This orientation is

feasible and has the added benefit of better wave management by removing the focusing of wave

energy that is currently occurring with a concave shaped shoreline. Any pulling back of the



shoreline to the west under option 3 would create problems on both sides of the property in terms

of slope grading transitions. Therefore, this option is considered not feasible.

3.0 Comparison of Alternatives and Selected Option

The no-action option (option 1) is not considered feasible due to the aggressive erosion at this site. The

slopes are unstable and unsafe. Furthermore, the eroding slopes are placing large amounts of sediment

into the lake which adversely affects water quality.

Although Option 3 is technically feasible, pulling back the tableland would require earthwork outside the

limits of the property. Option 3 is no longer feasible to construct if the tableland is pulled back without

disturbing the parcel to the south leaving a vertical slope at the south property limits.

This leaves Option 2 as the option that disturbs the least amount of the lake bottom while stabilizing the

bluff slope.

4.0 Mitigation of Lakebed Impact

The proposed project will result in more than 0.1 acre of impact below the Mean and Ordinary High Water;

therefore, mitigation will be required. The proposed option includes 0.33 acres of clean stone fill on the

lake bed below the OHWM. The calculations for this impacted area is included in Attachment C of this

report.

We first considered options for mitigating the lake bid impacts within the Lake Michigan watershed. We

assume that the mitigation ratio for an in-watershed project would be 1.5:1. Following is a summary of

ongoing conversations we have had with entities within the watershed regarding potential mitigation

opportunities:

• Illinois Beach State Park – we last reached out to the Illinois Beach State Park in late November of

2018. The site superintendent, Saki Villalobos, had retired and they had not yet hired a new

superintendent. We were not successful in getting in touch with the assistant superintendent, Bob

Seffer who was going to be out of the office for the entire month of December. Each time we have

reached out to the Illinois Beach State Park in the past, they had no projects lined up due to State

funding issues. We will identify if this situation has changed.

If the local mitigation opportunities are determined to be unfeasible, we would propose to mitigate for Lake

Michigan impacts at a wetland bank that is pre-approved by the Army Corps of Engineers. The wetland

credits would be purchased at a 3:1 ratio for uncertified credits (or 2:1 for certified) with three wetland

credits purchased for every one acre of proposed impact. Thus, the total wetland credits purchased to

mitigate for the 0.33 acres of impact would be 0.99 acres.



5.0 Wave Climate Evaluation and Stone Revetment Design Basis

Wave climate, transformation and forces developed for the proposed project provide design boundary

conditions for wave management, and structural and geotechnical analyses for the bluff stabilization. The

coastal engineering design analysis has the following primary focus:

• Evaluation of incident wave conditions for a variety of recurrence intervals at the project

structures.

• Estimation of wave forces to evaluate the stability of these structures.

• Evaluation of wave climate variability to establish the geometry and elevations proposed

structures.

• Identify wave overtopping potential and transmission characteristics that can affect the slope

above the stone.

• Develop boundary conditions for the evaluation of bluff and slope stability.

The shape, geometry and configuration of the structures are designed to manage incident wave conditions

such that the structures and the adjacent bluff are stable. In addition, the project is designed such that no

adverse wave reflections or wave climate changes would occur that could have an adverse impact on

adjacent shoreline areas or existing littoral drift.

The following tasks were completed as part of the coastal engineering evaluation for this site:

• Evaluate the bathymetric survey to define the lakebed near the site

• Identify deep water design wave conditions.

• Delineate wave approach angle zones to be utilized in the wave transformation. The number of

angle bands was selected such that the incident wave heights are representative of conditions at

this site. The analysis concludes that waves approaching from the north northeast are the worst

case design condition.

• Identify the representative nearshore lake bottom slope.

• Identify representative lake bed elevations near the shoreline.

• Evaluate design incident wave heights at the proposed structures using techniques that account

for the bathymetry. Refraction diagrams and analysis are performed for a range of wave periods,

heights and approach angle zones.

• The coastal engineering design analysis provides data to help establish wave overtopping and

transmission factors that help to establish the armor stone structure geometry and configuration.

• Estimate wave pressures acting on the structures to provide boundary conditions for the structural

design of these structures.

6.0 Impact Assessment

6.1 Chemical and Physical Characteristics

Revetment Fill

The proposed revetment and beach cell structures will be comprised of clean stone fill and will include the

placement of approximately 4,230 cubic yards of clean quarry stone below the Ordinary High Water Mark

of 581.5 (IGLD85).



Substrate

The primary substrate impact will be the introduction of clean stone on the lakebed.

Suspended Particulates

The proposed project will involve the placement of clean rock sand and crushed stone. There will be no

increase in suspended particle load or turbidity. Furthermore, the project will resolve ongoing bluff and

clay beach erosion which will reduce suspended particles and associated nutrients in Lake Michigan.

Water

The proposed construction activities will not alter the quality of the lake. Clean fill will include

approximately core stone and 1 foot to 5 foot diameter armor stones. This clean material will not

adversely impact water quality and no Illinois water quality standards will be exceeded during the

construction of the project.

Current Patterns and Water Circulation

The proposed structure will dampen wave energy near the shore. The stones absorb more wave energy

than the existing steep unprotected slopes. These changes will be localized and impacts to the larger

Lake Michigan ecosystems will be negligible. The project structures are to be located within the surf zone.

No significant changes to water current patterns or circulation are expected. In addition, no changes to

wave reflections will occur. The orientations of the lakefront structures are established to maintain the

current energy balance associated with wave reflections.

Littoral Drift

The proposed project will not impact the littoral drift.

6.2 Potential Impacts on Biological Characteristics of the Aquatic Ecosystem

Threatened and Endangered Species

As of May of 2019, seven species were listed on the US Fish and Wildlife Service Threatened Species for

Lake County, Illinois. Below is a summary of the proposed project’s impacts on each threatened species:

• Northern Long-Eared bat – This project area does not exist within 0.25 miles of a cave or mine where this species may hibernate. Trees removed as part of this project are unstable and at risk of falling into the lake in existing conditions. In the event that a tree will need to be removed, removal will not occur in the months of June and July if any maternity roost trees are found within 150 feet of the tree proposed to be removed.

• Piping plover – High lake levels have resulted in an actively eroding bluff with no beach at this location. In addition, this coastline is in a residential area and piping plovers are very sensitive to the presence of people and dogs. There is no piping plover habitat likely in the proposed project area.

• Rufa Red knot – Similar to the piping plover, high lake levels have resulted in an actively eroding bluff with no beach at this location. Thus, there is no Rufa Red knot likely in the proposed project area.

• Karner blue butterfly – There is no wetland or savannah in the project area. There is no known wild lupine (habitat for the Karner Blue) in the project area that will be impacted by the proposed project.

• Rusty patched bumble bee – The coastline in North East Illinois does not have any known rusty patched bumble bee sightings. The bees need areas that provide nectar and pollen from flowers.



Because the proposed project area contains residential yard and eroded bluff, proposed construction will not impact any area that may be considered rusty patched bumble bee habitat.

• Eastern prairie fringed orchid – this species occurs in sedge, meadow, fen, marsh, or marsh edge habitat. There are no wet prairie or wetland areas in the proposed project area.

• Pitcher’s thistle – High lake levels have resulted in an actively eroding bluff with no beach at this location. Historically, there are no dunes along this part of the coast where this species can grow.

Fish, Crustaceans, Mollusks, and Other Aquatic Organisms in the Food Web

The existing habitat at the project site is limited or non-existent. The proposed stone toe structures will

enhance habitat quality for a wide variety of aquatic species by creating sheltered and shaded areas

during mild wave periods. The proposed stone structures will be preferable to the existing rapidly eroding

slope from this perspective.

6.3 Potential Impacts on Special Aquatic Sites

“Special Aquatic Sites” refers to recognized sanctuaries and refuges, wetlands, mud flats, vegetated

shallows, coral reefs, riffle and pool complexes. The proposed construction will take place on a rapidly

eroding bluff zone and does not possess any of the above listed features. Consequently, no Special

Aquatic Sites will be impacted.

6.4 Actions to Minimize Adverse Effects

Fill will be limited to the extent required to create a safe and stable slope within the specific areas indicated

on the attached plans. The appropriate erosion and sediment control measures will be taken in

accordance with the Illinois Urban Manual for the earth grading portion of the project.

7.0 Summary

The project will comply with the factual determinations under 40 CFR 230.11. The project will reestablish

a stable shoreline by establishing slope protection at the water’s edge. This protection will include armor

stone revetment and bluff slope re-grading. The revetment will provide bluff toe protection against wave

attack and will protect the upper steep slope zone. Fill material will consist of clean stone comprised of

approximately 1 to 5-foot diameter stones. These materials will not adversely impact water quality.



Attachment A

Mailing Labels

Properties North and South of

633 Circle Lane, Lake Forest, IL 60045

North

MR & MRS THOMAS MADSEN (575 CIRLCE LN)

TERRY ROZDOLSKY (THREE LOTS @ 575 & 595 CIRCLE LN)

South

EVA LOSACCO

MCCORMICK WOODS NATURE PRESERVE

CITY OF LAKE FOREST

FORT SHERIDAN FOREST PRESERVE

LAKE COUNTY FOREST PRESERVE DISTRICT

OPENLANDS LAKESHORE PRESERVE

C/O AKA CORLANDS



Attachment B

Proposed Project Plan

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Printed on ___% Post-Consumer

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KEY PLAN

REGISTRATION

CONSULTANT

AECOM Technical Services, Inc.

303 E Wacker Drive Suite 1400

Chicago, IL 60601

312.373.7700 tel 312.373.6800 fax

www.aecom.com

CLIENT

Tim & Heather

Richmond

633 Circle Lane

Lake Forest, Illinois

60045

PROJECT

Lake Michigan

Shoreline Restoration

633 Circle Lane


60045

PROJECT NUMBER

AR

CH

D

2

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SURVEYED BY: R.E. DECKER, DECEMBER 20, 2018

VERTICAL DATUM: NAVD 88

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BLANKET ARMOR 1.5:1

INDR LIMIT FOR

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CONSTRUCTION



KEY PLAN

REGISTRATION

CONSULTANT



Chicago, IL 60601

312.373.7700 tel 312.373.6800 fax

www.aecom.com

CLIENT

Tim & Heather

Richmond

633 Circle Lane


60045

PROJECT

Lake Michigan


633 Circle Lane


60045

PROJECT NUMBER

AR

CH

D

2

4" x 3

6"


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X

X

X

1.5' THICK CORE STONE (TYP)

GEOFABRIC FILTER

ARMOR STONE

REVETMENT

EL 577

EL 588

EL 590



KEY PLAN

REGISTRATION

CONSULTANT



Chicago, IL 60601

312.373.7700 tel 312.373.6800 fax

www.aecom.com

CLIENT

Tim & Heather

Richmond

633 Circle Lane


60045

PROJECT

Lake Michigan


633 Circle Lane


60045

PROJECT NUMBER

AR

CH

D

2

4" x 3

6"


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A YYYY-MM-DD

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Scale 1" = 10'

AutoCAD SHX Text

SCALE: 1" = 10'

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Attachment C

Volume and Area Below OHWM - Calculations

TO

P O

F B

LU

FF

LIN

E F

RO

M

1

96

7

TO

P O

F B

LU

FF

LIN

E F

RO

M

1

96

7

O

R

D

IN

A

R

Y

H

IG

H

W

A

T

E

R

L

IN

E

E

L

E

V

5

8

2

.0

3

5

'

11'

5

'

FLAT ARMOR

STONE ACCESS

6

3

0

6

3

0

6

3

5

6

4

0

5

9

5

5

9

0

5

9

0

5

8

8

57

7

590

588

58

4

57

9

6

0

0

6

0

5

6

1

0

6

1

5

6

2

0

6

2

5

2:1

2

:

1

2:1

2

:1

2

:1

2

:

1

2:1

2:1

2

:1

2

:

1

2

:

1

1.5:1

1.5:1

1.5:1

1.5:1

1.5:1

1.5:1

1.5:1

3:1

3:1

3:1

3:1

3:1

3:1

3:1

3:1

3:1

3.5:1

3.5:1

3.5:1

2

:

1

3.5:1

1

-

ORDINARY HIGH WATER LINE

ELEV 582.03 NAVD88

TOTAL STONE FILL

BELOW OHWM = 0.33 AC

PROPOSED STONE

BLANKET ARMOR 1.5:1

INDR LIMIT FOR

OFFSHORE

CONSTRUCTION

Ele

va

tio

n

Ele

va

tio

n

Station

575

580

585

590

595

600

605

610

615

620

625

575

580

585

590

595

600

605

610

615

620

625

0+00 1+001+00

Ele

va

tio

n

Ele

va

tio

n

Station

575

580

585

590

595

600

605

610

615

575

580

585

590

595

600

605

610

615

0+00 1+001+00

area = 173 sf

area = 115 sf

MOHWM

ELEV 581.5

MOHWM

ELEV 581.5

Elevation

Elevation

Station

575

580

585

590

595

600

605

610

615

575

580

585

590

595

600

605

610

615

0+00 1+001+00

Elevation

Elevation

Station

575

580

585

590

595

600

605

610

615

575

580

585

590

595

600

605

610

615

0+00 1+001+00

area = 115 sf

area = 136 sf

MOHWM

ELEV 581.5

MOHWM

ELEV 581.5



AR

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(5)

(6)

(7)

(8)

KEY PLAN

REGISTRATION

CONSULTANT



Chicago, IL 60601

312.373.7700 tel 312.373.6800 fax

www.aecom.com

CLIENT

Heather Richmond

633 Circle Lane


60045

PROJECT

Lake Michigan


633 Circle Lane


60045

PROJECT NUMBER


ISSUE/REVISION

A YYYY-MM-DD

SHEET TITLE

Volume Calculation

SHEET NUMBER

######## OF ####

PROPOSED

EXISTING

PROPOSED

PROPOSED

PROPOSED

EXISTING

EXISTING

EXISTING

the proposed activity complies with illinois’ …application for a federal consistency certificate...

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