Lilydale Regional Park“North Knob” Stabilization Meeting

February 1, 2018

Meeting Agenda

1. Introductions & Project Background– General– Cherokee Heights Ravine

2. Engineering Design Items– North Knob Slope Design/Geometry– Disposal Site– Restoration-3D simulation

3. Schedule– Bidding– Construction

4. Questions/Discussion

2

Location Map

Rail R

oad

7th St W

ShepardRd

Ohi

o S

t

Water S

t

Saint Clair Ave

Bay

St

Jefferson Ave

Lexi

ngto

n P

kwy

S

Win

slow

Ave

Otto Ave

Page St W

Erie

St

Vict

oria

St S

View

St

Baker St W

King St W

Juno Ave

Sidney St W

Armstrong Ave

Man

omin

Ave

Otta

wa

Ave

George St W

Smith

Ave

Tuscarora Ave

Che

roke

e A

ve

Cha

rlton

St

Cha

tsw

orth

St S

Grace St

Watson Ave

Orle

ans

St

Bello

ws

St

Dal

y S

t

Stevens St W

Osc

eola

Ave

S

Curtice St W

Robie St W

Winona St W

One

ida

St

Arbo

r St

Annapolis St W

Toro

nto

St

Wyoming St W

Duk

e S

t

Mon

tcal

m P

l

Michigan St

Del

awar

e Av

e

Isabel St W

Winifred St W

Dodd R

d

Chi

ppew

a A

ve

Montreal Ave

Fulto

n S

t

Scheffer Ave

Juliet Ave

Alas

ka A

ve

Clif

ton

St

Lombard Ave

Stewart

Ave

Congress St W

Randolph Ave

Eleanor Ave

Ben Hill Rd

James Ave

Cliff S

t

Palace Ave

Milt

on S

t S

Delos St W

Race S

t

Elw

ay S

t

Dra

keS

t

Cherok ee H

eigh

ts B

lvd

Col

born

e S

t

Glen Ter

Pleasant Ave

Can

ton

St

Benso

n Ave

Montreal W

ay

Web

ster

St

Av

Smith e St

ryke

rAve

Albion Ave

Morton St W

Ann

St

Forster St

Wes

tern

Ave

S

Ivan Way

Buttern

ut Ave

Palmer

Pl

Bayard Ave

Bidw

ell S

t

Edgcumbe Rd

Avon

St S

Vanc

e S

t

May St

Orr

in S

t

Deu

bene

r Pl

Linwood Ave

Sem

inol

e A

ve

Ric

hmon

d S

t

Nug

ent A

ve

Was

eca

St

Monroe Ct

Adrian

St

Clay StAlice St

Sumac St

Mercer St

Col

born

e S

t

Milt

on S

t S

Pleasant Ave

Palace Ave

Watson Ave

Race S

t

Baker St W

Erie

St

Ayd Mill Rd

Was

eca

St

Vanc

e S

t

Bidw

ell S

t

Bayard Ave

Otto Ave

Shepa

rd Rd

Linwood Ave

Robie St W

James Ave

Web

ster

St

Edgc

umbe

Rd

Cherokee Ave

Cha

rlton

St

Duk

e S

t

James Ave

Eleanor Ave

Web

ster

St

Grace St

Watson Ave

Palace AveKing St W

Pleasant AveLinwood Ave

Lilydale Rd

7th St W

Fossil Ground Area

Pickerel Lake

To P

arkin

g Lo

t

FossilBed

FossilBed

FossilBed

FossilBed

Wetland

Wetland

M i

s s

i s s

i p

p i

R i

v e

r Pickerel Lake

Middle

ClayPit dFossil Be

WetlandConcrete Slab

Echo CaveBrick OvenWater Fall

StreamClay Pitt

Parking Lot

Streets

Scenic Overlook

Trails - Off Streets

Fossil Ground

Boat Launch

Key

WaterFall

BrickOven

EchoCave

ConcreteSlab

WaterFall

Bruce VentoScenic

Overlook

East ClayPit

West C

layPit

Trail Head

WaterFall

Chero

kee H

eight

Blvd

Annapolis St

LilydaleRegional Park

Crosby FarmRegional Park

CherokeeRegional Park

Harriet IslandRegional Park

Caution Lilydale fossil ground trails are on steep slopes. No water available.

FossilGroundParking

Lot

St. Paul Parks and RecreationParks and Rec GISMap Prepared By: Ger PhaNov, 2006

FossilGround

Bruce VentoScenic Overlook

Sam Morgan Regional Trail

City of Saint PaulParks and Recreation

Lilydale Regional Park

?±A@35E

35E

?±A@

Rail R

oad

*

Mississippi River

Pickerel Lake

Hwy 13

Brickyard Trail

Annapolis

North Knob

History of Site

Former location of Twin Cities Brickyards

Cherokee Regional Park

Cherokee Hts Ravine

k

k

k

k

k

k

k

k

k

k

k

!<

13

149

Annapolis St

Man

omin

Ave

Sm

ith A

ve

W Sidney St

W Curtice St

W Winona St

Otta

wa

Ave

S S

mith

Ave

W Wyoming St

S O

ttaw

a Av

e

Del

awar

e Av

e

Che

roke

e Av

e

Chi

ppew

a Av

e

Winston Ct

S D

elaw

are

Ave

Miriam St

Dod

d Rd

W Water S

t

Hiawatha Ave

Mina St

Che

roke

e Heig

hts B

lvd

S C

hero

kee

Hei

ghts

Ave

Fremont Ave

Simard St

Die

go L

a

Sutcliff Cir

Downing St

Garden La Dewerff St

W Bernard St

Chi

ppew

a Av

e

STORMWATER MODELINGBrickyard Area of

Lilydale Regional ParkSt. Paul, Minnesota

FIGURE 4-1

k Waterfall

k Seep

!< Bruce Vento Scenic Overlook

Storm Sewer Manholes

Culvert Crossing

Storm Sewer Pipes

Ravine/Stream Channel Includedin Study

Subwatershed Divides

Major Watersheds

Cherokee Heights

Cherokee Ravine

Cherokee Ravine 2

Fremont

Fremont Ravine

Fremont Ravine 2

Fremont Ravine 3

Trail

Barr

Foo

ter:

Arc

GIS

10.

3, 2

015-

01-2

9 09

:42

File

: I:\C

lient

\Sai

ntPa

ul\2

3621

151_

Lily

dale

_Reg

_Par

k\M

aps\

Repo

rts\

Repo

rt\S

torm

wat

erM

odel

Land

scap

e.m

xd U

ser:

sms

I0 300150

Feet

C: Fremont Avenue Culvert

B: Cherokee Heights Culvert

A: North Cherokee Heights Culvert

Drainage Areas

49 acres

22 acres

k

k

k

k

!?#V

k

k

k

k

!<

k

k

k

13

W Water S

t

Hiaw

atha A

ve

Che

roke

e Heig

hts B

lvd

Miriam St

Sutcliff Cir

Fremont Ave

Sim

ard S

t

Garden La

Annapolis St

Æü

RECOMMENDATIONSBrickyard Area of

Lilydale Regional ParkSt. Paul, Minnesota

FIGURE 5-1

Barr

Fo

oter

: Arc

GIS

10.

3, 2

015-

01-2

9 09

:43

File

: I:\

Clie

nt\S

aint

Paul

\236

2115

1_Li

lyda

le_R

eg_P

ark\

Map

s\Re

port

s\Re

port

\Rec

om

men

dat

ions

.mxd

Use

r: s

ms

I0 200100

Feet

West Clay Pit

Middle Clay Pit

Brickyard Access Trail - Bruce Vento Spur

Brickyard Access Trail - Bluff Section

Brickyard Trail - Connector Section

Sinkhole

East Clay Pit

Northwest Slope Failure

Cherokee Regional ParkParking/Picnic Area

North Ravine Falls

Brickyard Trail Lower Falls

East Clay PitFalls

Cherokee Heights Ravine

Brickyard Trail -Lower Section

0Brickyard Trail - Fossil/Brick OvenSection

North Ravine

Old Scarp

Brickyard Trail Culvert

2013 Slope Failure Area

North Knob

Fremont Avenue Culvert

Cherokee Heights Culvert

North Cherokee Heights Culvert

ESRI Imagery, 4/4/2012.

Fossil Site 1Fossil Site 2

Fossil Site 3

Fossil Site 4

Lower North Stream Channel

k Waterfall

k Seep

!< Bruce Vento ScenicOverlook

#V Echo Cave

!? Brick Oven

Brickyard Trail SectionBreak Points

Culvert Crossing

Railroad

Undeveloped Footpath

Paved Trail

Ravine/Stream ChannelIncluded in Study

RecommendationsCherokee HeightsProject

Inspect for Erosion

Replace Culvert

Stabilize Ravine

Stabilize Slope

Stabilize Trail

Restrict Access

Fossil Bed Proposed toRemain OpenFossil Bed Proposed toClose

Wetland

Clay Pit Wall

Study LimitsBrickyard Access Trail

Brickyard Trail

North Knob

Ravine

Ravine

P

P

Pre-construction condition (March 2015)4’ gully across path- culvert 100% blocked and washout around

Culvert Repair (April 2015)

Culvert removed, ravine channel regraded and culvert replaced.

Post Rain Event (May 8, 2015)

75% blockage after rain event. Upstream channel diverted during rain event and resulted in erosion west of culvert.

Post Rain Event (May 28, 2015)

100% blockage after additional rain events.

Sediment from North Knob area will continue to be deposited into Pickerel Lake and Mississippi River until North Knob stabilized.

Sediment caught by floating silt curtain

Sediment carried to Mississippi River via Pickerel Lake

Funding Request Summary

February 2016 - request $4.584 million to Minnesota Board of Water and Soil Resources (BWSR) - Unsuccessful.

May 2016 - resubmitted request to BWSR for Disaster Relief Funds (DRAP) for $1.905 million focusing on steep slope stability.

December 2016 - Received $925,000 in DRAP funds. Need for additional funds for restoration

- Received $164,500 Conservation Partners Legacy to enhance 61 acres of forest and prairie habitat in Cherokee Regional Park. Portion of funds will go towards bluff restoration.

- Reviewing application for restoration funds from Natural Resource Trust Fund in partnership with Ramsey Conservation District and Great River Greening. February 2018 deadline.

Meeting Agenda

1. Introductions & Project Background– General– Cherokee Heights Ravine

2. Engineering Design Items– North Knob Slope Design/Geometry– Disposal Site– Restoration-3D simulation

3. Schedule– Bidding– Construction

4. Questions/Discussion

4

Upstream Drainage Area Cherokee Heights Ravine

1

Municipal Boundary

Storm Sewer Manholes

Storm Sewer Pipes

k Waterfall

Stream/Ravine

Cherokee Heights Ravine

Cherokee Heights StudyArea

Brickyard Area Study Limits

Cherokee HeightsWatershed

Cherokee Heights RavineImprovement Alternatives Considered

1. Downstream channel stabilization• Engineered and bioengineering techniques• Selective planting and vegetation management

2. Peak flow reduction (US storage/culvert modifications)• Upstream storage & infiltration reduced bluff slope stability• Significant excavation changed park aesthetics• Loss of trees and park space

3. Downstream piped system• Riprap channel & piped system

to Mississippi River• High construction cost

6

Cherokee Heights Ravine 2018-2019 Improvements

1. Downstream channel stabilization

2. Underground stormwater treatment systems

7

Cherokee Heights Ravine Improvements Funding Sources

Project to be funded by BWSR Clean Water Fund grant award and contributing cities:

• Mendota Heights• West St. Paul• St. Paul

8

Meeting Agenda

1. Introductions & Project Background– General– Cherokee Heights Ravine

2. Engineering Design Items– North Knob Slope Design/Geometry– Disposal Site– Restoration-3D simulation

3. Schedule– Bidding– Construction

4. Questions/Discussion

9

Lilydale Park – Site Map

10

North Knob Area

Brickyard Trail

Next image

2015 Aerial Image (Post-June 2014 Failure)

11

FailedSoils and

New Stream

Channel Large2014 FailureArea

Seepage

Upper Waterfall

Lower Waterfall

Slope Failure Area & Lower North Stream Channel

12

March 30, 2017

Slope Failure Area & Lower North Stream Channel

13

Seepage

Large June 2014 slope failure from below with inset showing seepage (July 2014 site visit)

14Large slide, looking up through eroded stream channel (December 4 2017 site visit)

Slope Failure Area & Lower Stream Channel

Lower Stream Channel & Washed-out Culvert

15

North Knob Stabilization Improvement Alternatives Considered

1. Mechanical Stabilization – soil nails• Unnatural aesthetics• High cost

2. Mechanical Stabilization – piles• Constructability issues• High cost

3. Mechanical Stabilization – walls• Unnatural aesthetics• Constructability issues• High cost

4. Graded Slope Stabilization• Selected alternative due to aesthetics, cost and

constructability

16

Conceptual Slope Stabilization OptionsSoil Nails

17

Conceptual Slope Stabilization OptionsPiles

18

Conceptual Slope Stabilization OptionsWalls, Graded Slope, Soils Nails

19

Conceptual Slope Stabilization OptionsGraded Slope, Toe Protection

20

Final Grading Cross-Section

21

– Area of excavation

Soil Fill

Rock Buttress and Armored Toe of Slope

Stable Slope

Final Grading Concept

22

Grading Area

Alternate Grading Area

Waterfall Overlook

Lower Trail

Restoration - 3D Simulation

23

Existing Proposed

Restoration - Simulation

24

Restoration - Examples

25

Restoration - Examples

26

Disposal Area

27

Disposal Area

28

Work Elements

• Clearing & grubbing – slope and disposal area• Excavation & grading • Graded filter blanket for seepage conveyance• Riprap armoring at toe of slope• Erosion control & site restoration• Topsoil and vegetation

29

Grading and Earthwork Summary

• North Knob– 43,000 – 45,000 sq. ft. slope grading (2.5 hockey rinks)– 13,500 C.Y. of cut (8 ft. soil over 1 football field)– 3,300 C.Y. of filter rock and riprap toe protection

(5 ft. covering 1 hockey rink) • Disposal Site

– 50,000 sq. ft. grading (1 football field)– 10,000 cubic yards of fill (5.5 ft. over 1 football field)

30

Schedule

WSCO Meeting – February 1, 2018 Bidding – February/March 2018 Construction – Summer 2018

31

Questions/Discussion

32