LAKE LORELEI DREDGING COMMITTEE UPDATE APRIL 21, 2018 Dredging - - PDF document

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LAKE LORELEI

DREDGING COMMITTEE UPDATE APRIL 21, 2018 Dredging Committee

Waste e Disposal l Sites John Wyman George Mason Dredgin ing g Methods ds Fran Nimmons Chris Johnstone Cindi Wetzel Areas as and Depths Mike Powell Scott Kaufman Permit it Requir irem emen ents TJ Jackson

John Wyman Chairman

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Committee Goal:

Provi vide de written itten repor

• rt

t to the Board of Trus ustees tees discu cussi sing ng all aspects ects of dredg dgin ing at all l 3 lakes es with th conclu lusion sions s and reco commen endation tions s on these se items: s:

• Silt Depth and approximate quantities to be removed
• Most efficient/economical combination of dredging methods
• Transfer/Disposal sites including preparation and rehabilitation
• Timing and requirements for obtaining permits
• Bid and award procedures
• Estimated costs
• Sale/Use of dredged materials
• Funding options

Definitions Cubic Yard d (cy): ): Unit of measurement that refers to the amount of materials removed. Muck: Combination of Silt, Clay Organics and Debris Dredgin ing: g: Removing muck, sediment and debris from lake bottom Hard Pan: Lake Bottom Original Depth

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Why is Dredging Necessary: 1- Greatly improves Water Quality, which improves the lives of fish and fishing opportunities; 2- Boats will have more water under the boat and less sediment will get caught in the propeller; 3- Lake habitat is restored; 4- Removes toxic substances (fertilizers from farms), reduces rooted aquatic growth (algae and plants) and lessons sediment resuspension winds and waves. When is it time to dredge: First Signs: 1- Boat motors start churning up mud; 2- Unsightly weeds/algae begin to emerge. At first this area is limited to a small area. However,

• ver time, this area grows and the surface water area

starts shrinking in size. It becomes more difficult to maneuver boats without damaging expensive motors.

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When is it time to dredge: Second Sign: 1- Water Quality begins to deteriorate. After rainfall or high winds, more sediment is deposited and re-suspended. The water takes longer to clear and it is a murky brown color. The water quality is noticeably lower than in years past. This reflects on the aesthetics of the entire community. Muck Removal/Depths

• Gary Brainard (Dredge Resources) has been hired by the Board to assist in

determining approximate silt depth in each dredging area.

• Every company has recommended dredging from the

‘Hard Pan’ up to 6-7’ water depths (below the light level)

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Dredging Areas Cove A Dredging Areas Cove B

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Dredging Areas East Beach Dredging Areas Cove C

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Dredging Areas Elm Cove Dredging Areas Cove D

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Dredging Areas Cove E Dredging Areas Inlet North

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Dredging Areas Inlet Middle Dredging Areas Inlet South

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Dredging Areas Cove F Dredging Areas Cove G

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Dredging Areas Cove H Dredging Areas Cove I Including Grunewald and Fichtelberg

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Dredging Methods Available 1- Hydraulic Dredging

• to settling basins or bags
• to dewatering equipment

2-Mechanical Dredging

• Water Based from Barges
• Land Based with long reach excavator
• Lake Bottom Based when water is down

Hydraulic Dredging

“A floating dredge using a centrifugal pump to draw mud or sand and discharge it elsewhere.”

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Mechanical Dredging- Water Based

“Mechanically digging or gathering sediment from the bottom surface of a body of water, typically through the use of a bucket located on a barge. The material that is dredged is loaded into a secondary barge and hauled away.”

Mechanical Dredging- Land Based:

“Mechanically digging or gathering sediment from the bottom surface

• f a body of water, typically through the use of a bucket from the
• shore. The material that is dredged is loaded in a truck

and hauled away.”

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Mechanical Dredging - Lake Bottom Based :

“Lower water level 6-8 feet and excavate materials directly from lake bottom.”

Companies es Inter ervi viewed ed

• Dredge Resources- January 23, 2018
• Mootz Construction- March 2, 2018
• Davis Aquatic and Env. Ser. - March 14, 2018
• McCullough Excavating and Silt Removal- March 16, 2018
• Dredgit- Waiting on sample results before meeting

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Dredge e Resour urces es Experience: Hidden Valley Lake and Kentucky Lake

• Can do Hydraulic, Mechanical and Land Dredging

Recommend Optimal Water Depth of 6-7’

• Need Transfer Points and Disposal Sites
• Work Monday-Thursday
• Site prep and rehab
• Charges by the day

Mootz Constructi ction Experience: Heritage Lake and Citizens Energy

• Performs Mechanical, Hydraulic and Land Dredging
• Charges by the month
• Does not guarantee cy removal

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Davis Aquatic ic and Environmen mental tal Services ces Experience: Lake Seneca and Hidden Valley

• Able to do Hydraulic and Mechanical Dredging
• Recommend Optimal Water Depth of 6-7’

Hydraulic Dredging

• Bags 200’ long x 20’ Wide x 9’ High (1000cy capacity)
• Need level surface and can stack
• Dry out after one season and can haul away
• 300 cy/day + 3000 gallons of water
• Stay 5’ away from docks

Davis Aquatic ic and Environmen mental tal Services ces Mechanical Dredge from Barges

• Need Transfer Points and Disposal Sites
• Can remove 12-18,000 cy per month
• Stay 5’ away from docks

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McCulloug

• ugh

h Excavatin ting and Silt Removal al

• Able to do Hydraulic and Mechanical Dredging
• Recommend Optimal Water Depth of 6-7’
• Can get 3’ away from docks
• Can remove 200,000 cy in 8 months
• Need on-site Disposal
• Recommends Erosion Control and Silt Pond at Glady’s Run
• Recommends doing Grunewald and Fichtelberg last

Disposal Site Options

1- Keep On Site

• Total area needed contingent upon Cubic Yards Removed
• Committee investigating viable areas

2- Haul Off Site

• Increases cost due to additional time and Distance to Haul
• Increases cost due to site lease/disposal fees

Also Being Investigated:

• Possible uses of removed materials

(requires cleaning and testing)

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Permits

1- Investigating State and Local Requirements. Clean Water Act. 2- Investigating what other lakes in the areas were required to

• btain.

Permit Requirements continues to be investigated with ODNR, Army Corp of Engineers, Brown County and State of Ohio. Plans need to be finalized before seekigng Permits/Permissions

• Lake Lakengren- No Permit Required
• Hidden Valley- Letter from USACE, No Permit Required
• Waynoka- No Permit Required initially. OEPA now required
• Heritage Lake- USACE contact

Lake Communities Interviewed

Lake Lakengren Hidden Valley Lake Lake Waynoka

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Lake Communities Interviewed

Lake Lakengren

(near Eaton, Ohio)

• Mechanical from barges
• Purchased own equipment
• Peformed by Lakengren Maintanance Staff
• Removed approx. 120,000 cy of sediment over 6 years

Annual Operating Budget- $1,405,739.00

Main Lake Size- 207 Acre Constructed in 1969

Lake Communities Interviewed

Hidden Valley Lake

(near Lawrenceburg, IN)

• Mechanical from barges
• Removed approx. 55,000 cy of sediment over 10 years
• Cost- $880,000
• Cleaned and used materials as fill and topsoil

Annual Operating Budget- $2,299,000.00

Main Lake Size- 150 Acre Constructed in 1972

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Lake Communities Interviewed

Lake Waynoka

Meeting in May, 2018

• Mechanical Dredging from Barge
• Work performed by Waynoka Staff

Annual Operating Budget- $1,690,000.00

Main Lake Size- 290 Acre Constructed in 1970

Our Lake

Lake Lorelei

Annual Operating Budget- $769,718.00

Main Lake Size- 188 Acre Constructed in 1968

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Previous Lorelei Dredging 1991-1992: Hydraulic Dredging with Settling Basins at Fichtelberg Plain

1- North End Inlet (1991)

• Average Sediment Depth- 19.27”
• Approximate Cubic Yards Removed- 34,198 cy

2- Lake Fichtelberg (1992)

• Average Sediment Depth- 22.22”
• Approximate Cubic Yards Removed- 29,486 cy

Cost:

• $198,527.50 funded by special assessment of $232,000

What’s Next for the Committee:

Complete research and finalize:

• Silt depth and approximate quantities to be removed
• Most efficient/economical combination of dredging methods
• Transfer/Disposal sites including preparation and rehabilitation
• Timing and requirements for obtaining permits

Research and Finalize:

• Bid and award procedures
• Estimated costs
• Sale/Use of dredged materials
• Funding options