Lilydale Regional Park North Knob Stabilization Meeting February 1, - - PowerPoint PPT Presentation

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Lilydale Regional Park North Knob Stabilization Meeting February 1, - - PowerPoint PPT Presentation

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Lilydale Regional Park North Knob Stabilization Meeting February 1, 2018 Me e ting Ag e nda 1. Introductions & Project Background General Cherokee Heights Ravine 2. Engineering Design Items North Knob Slope

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Lilydale Regional Park “North Knob” Stabilization Meeting

February 1, 2018

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Me e ting Ag e nda

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

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Location Map

Rail Road 7th St W S h e p a r d R d Ohio St Water St Saint Clair Ave B a y S t Jefferson Ave Lexington Pkwy S Winslow Ave O t t

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v e Page St W E r i e S t V i c t

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i a S t S View St Baker St W K i n g S t W Juno Ave Sidney St W Armstrong Ave Manomin Ave Ottawa Ave G e

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g e S t W Smith Ave T u s c a r

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a A v e Cherokee Ave C h a r l t

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S t Chatsworth St S Grace St Watson Ave Orleans St Bellows St Daly St Stevens St W O s c e

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a A v e S Curtice St W Robie St W Winona St W O n e i d a S t A r b

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S t A n n a p

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i s S t W T

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t

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t Wyoming St W Duke St M

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t c a l m P l Michigan St D e l a w a r e A v e Isabel St W Winifred St W Dodd Rd Chippewa Ave Montreal Ave Fulton St Scheffer Ave Juliet Ave Alaska Ave C l i f t

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S t Lombard Ave Stewart Ave C

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g r e s s S t W Randolph Ave Eleanor Ave Ben Hill Rd James Ave Cliff St Palace Ave Milton St S D e l

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S t W R a c e S t Elway St D r a k e S t

Ch e r

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ee Heights Blvd

Colborne St G l e n T e r Pleasant Ave Canton St Benson Ave M

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t r e a l W a y Webster St Av Smith e S t r y k e r A v e Albion Ave Morton St W A n n S t F

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s t e r S t Western Ave S Ivan Way Butternut Ave P a l m e r P l B a y a r d A v e Bidwell St Edgcumbe Rd Avon St S V a n c e S t May St O r r i n S t D e u b e n e r P l Linwood Ave

Seminole Ave

Richmond St Nugent Ave Waseca St Monroe Ct Adrian St Clay St

A l i c e S t

Sumac St Mercer St C

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b

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n e S t M i l t

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S t S P l e a s a n t A v e Palace Ave Watson Ave R a c e S t Baker St W Erie St Ayd Mill Rd Waseca St V a n c e S t Bidwell St Bayard Ave Otto Ave Shepard Rd Linwood Ave Robie St W James Ave Webster St E d g c u m b e R d C h e r

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e e A v e

C h a r l t
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S t

Duke St James Ave Eleanor Ave Webster St Grace St W a t s

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A v e Palace Ave King St W Pleasant Ave Linwood Ave Lilydale Rd 7th St W

Fossil Ground Area

Pickerel Lake

To Parking Lot Fossil Bed Fossil Bed Fossil Bed Fossil Bed

Wetland

Wetland M i s s i s s i p p i R i v e r Pickerel Lake M i d d l e C l a y P it d Fossil Be Wetland Concrete Slab Echo Cave Brick Oven Water Fall Stream Clay Pitt

Parking Lot Streets Scenic Overlook Trails - Off Streets Fossil Ground Boat Launch

Key

Water Fall Brick Oven Echo Cave C

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c r e t e S l a b Water Fall Bruce Vento Scenic Overlook E a st C l a y P i t W es t Cla y P i t Trail Head

Water Fall

C h e r

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e e H e i g h t B l v d

Annapolis St

Lilydale Regional Park

Crosby Farm Regional Park Cherokee Regional Park Harriet Island Regional Park

Caution Lilydale fossil ground trails are on steep slopes. No water available. Fossil Ground Parking Lot

  • St. Paul Parks and Recreation

Parks and Rec GIS Map Prepared By: Ger Pha Nov, 2006

Fossil Ground

Bruce Vento Scenic Overlook

Sam M

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gan R eg i

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l Tr a il

City of Saint Paul Parks and Recreation

Lilydale Regional Park

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35E 35E

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R a i l R

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*

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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

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A n n a p

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i s S t Manomin Ave S m i t h A v e W Sidney St W Curtice St W W i n

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a S t Ottawa Ave S Smith Ave W Wyoming St S Ottawa Ave D e l a w a r e A v e C h e r

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e e A v e Chippewa Ave Winston Ct S D e l a w a r e A v e Miriam St D

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d R d W Water St Hiawatha Ave M i n a S t Cherokee Heights Blvd S Cherokee Heights Ave F r e m

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t A v e Simard St Diego La S u t c l i f f C i r D

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n i n g S t G a r d e n L a Dewerff St W Bernard St Chippewa Ave

STORMWATER MODELING Brickyard Area of Lilydale Regional Park

  • St. Paul, Minnesota

FIGURE 4-1

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Waterfall

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Seep

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Bruce Vento Scenic Overlook Storm Sewer Manholes Culvert Crossing Storm Sewer Pipes Ravine/Stream Channel Included in Study Subwatershed Divides Major Watersheds Cherokee Heights Cherokee Ravine Cherokee Ravine 2 Fremont Fremont Ravine Fremont Ravine 2 Fremont Ravine 3 Trail

I

300 150 Feet

C: Fremont Avenue Culvert B: Cherokee Heights Culvert A: North Cherokee Heights Culvert

Drainage Areas

49 acres 22 acres

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Cherokee Heights Blvd F r e m

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Brickyard Access Trail - Bluff Section Brickyard Trail - Connector Section Sinkhole East Clay Pit Northwest Slope Failure Cherokee Regional Park Parking/Picnic Area North Ravine Falls Brickyard Trail Lower Falls East Clay Pit Falls Cherokee Heights Ravine Brickyard Trail - Lower Section Brickyard Trail - Fossil/Brick Oven Section North Ravine Old Scarp Brickyard Trail Culvert 2013 Slope Failure Area North Knob Fremont Avenue Culvert Cherokee Heights Culvert North Cherokee Heights Culv Fossil Site 1 Fossil Site 2 Fossil Site 3 Lower North Stream Channel

North Knob Ravine Ravine

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P P

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

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Culvert Repair (April 2015) Culvert removed, ravine channel regraded and culvert replaced.

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Post Rain Event (May 8, 2015) 75% blockage after rain

  • event. Upstream channel

diverted during rain event and resulted in erosion west of culvert.

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Post Rain Event (May 28, 2015) 100% blockage after additional rain events.

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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

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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.

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Me e ting Ag e nda

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

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Upstre a m Dra ina g e Are a Che ro ke e He ig hts Ra vine

1 Municipal Boundary Storm Sewer Manholes Storm Sewer Pipes

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Waterfall Stream/Ravine Cherokee Heights Ravine Cherokee Heights Study Area Brickyard Area Study Limits Cherokee Heights Watershed

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Che ro ke e He ig hts Ra vine I mpro ve me nt Alte rna tive s Co nside re d

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

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Che ro ke e He ig hts Ra vine 2018-2019 I mpro ve me nts

1. Downstream channel stabilization 2. Underground stormwater treatment systems

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Che ro ke e He ig hts Ra vine I mpro ve me nts F unding So urc e s

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

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

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Me e ting Ag e nda

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

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L ilyda le Pa rk – Site Ma p

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North Knob Area Brickyard Trail Next image

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2015 Ae ria l I ma g e (Po st-June 2014 F a ilure )

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Failed Soils and New Stream Channel Large 2014 Failure Area Seepage Upper Waterfall Lower Waterfall

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Slo pe F a ilure Are a & L

  • we r No rth Stre a m Cha nne l

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March 30, 2017

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Slo pe F a ilure Are a & L

  • we r No rth Stre a m Cha nne l

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Seepage

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

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

Slo pe F a ilure Are a & L

  • we r Stre a m Cha nne l
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L

  • we r Stre a m Cha nne l & Wa she d-o ut Culve rt

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No rth K no b Sta b iliza tio n I mpro ve me nt Alte rna tive s Co nside re d

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

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Co nc e ptua l Slo pe Sta b iliza tio n Optio ns So il Na ils

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Co nc e ptua l Slo pe Sta b iliza tio n Optio ns Pile s

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Co nc e ptua l Slo pe Sta b iliza tio n Optio ns Wa lls, Gra de d Slo pe , So ils Na ils

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Co nc e ptua l Slo pe Sta b iliza tio n Optio ns Gra de d Slo pe , T

  • e Pro te c tio n

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F ina l Gra ding Cro ss-Se c tio n

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– Area of excavation Soil Fill Rock Buttress and Armored Toe of Slope Stable Slope

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F ina l Gra ding Co nc e pt

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Grading Area Alternate Grading Area Waterfall Overlook Lower Trail

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Re sto ra tio n - 3D Simula tio n

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Existing Proposed

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Re sto ra tio n - Simula tio n

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Re sto ra tio n - E xa mple s

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Re sto ra tio n - E xa mple s

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Dispo sa l Are a

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Dispo sa l Are a

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Wo rk E le me nts

  • 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

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Gra ding a nd E a rthwo rk Summa ry

  • 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)

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Sc he dule

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

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Que stio ns/ Disc ussio n

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