Landfill Expansion Project -Cell 9 Phase I I I Public Information BrochureCity of Dubuque
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Landfill Egansion Project Brochure
Copyrighted
November 6, 2017
Consent Items # 7.
Landfill Expansion Project - Cell 9 Phase III
City Manager transmitting the Fall 2017 Landfill Expansion
Project (Cell 9 Phase III) public information brochure from
the Dubuque Metropolitan Area Solid Waste Agency
(DMASWA).
Suggested Disposition: Receive and File
Type
Staff Memo
FALL 2017
Dubuque. Metropolitan Area Solid Waste Agency
DMASWA
providing environmentally sound solid waste solutions
An Environmentally Sound Landfill
Few people may realize how much planning goes into a landfill. The DMASWA works to ensure our
local landfill reflects the overall commitment the Agency has for the environment. Specifically, the
DMASWA is working hard to reduce greenhouse gases, protect groundwater, and facilitate well-
planned, community -driven conservation alternatives. The Agency believes proper management of
waste disposal is key to its commitment to Dubuque area communities and will continue to look
for ways to make it as environmentally sound as possible.
Dubuque Metro Landfill
A landfill is much more than a "dump" or a hole in the ground
where trash is buried. It is a complicated, carefully engineered
system designed to protect groundwater from contamination.
Landfills require years of planning and development and
represent a significant environmental and financial investment.
The Dubuque Metropolitan Area Landfill is divided into nine
cells or designated areas where the land is prepared for trash
disposal.
The CeII 9 Phase III Project
The DMASWA is nearing the completion of a $3.2 million
landfill expansion project at its location at 14501 Highway 20
West outside Dubuque.
• The expansion project is the third of five phases for the
landfill's cell #9, which is the ninth cell created at the site
since 1976.
• DMASWA staff estimate that the current location has the
potential to meet the area's needs for up to 60 years.
• The new cell will hold approximately 689,300 cubic yards
of material, or an additional 448,000 tons of materials to
fill it.
• It will create an additional four to five years of landfill
capacity. The landfill's permitted capacity is 19-20 years
and its "lifespan" at the site is expected to be another 50-
60 years.
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Building a new landfill cell takes
months and involves multiple stages
of construction. Many of the steps in
building the cell must be tested to make
sure standards/requirements are met
before moving on to the next phase.
• Total project cost is estimated at $3,176,393.
• Construction contract for $2,425,143.08 awarded to
Connolly Construction of Peosta
• Project funded through a solid waste revenue bond held by
Dubuque County that will be repaid by the DMASWA
• Engineering plans and specifications for project were
prepared by AECOM
• Project plans reviewed and approved by Iowa Department
of Natural Resources
Step -by -Step Landfill Cell Construction
Q Site Preparation
a. Remove all vegetation and stockpile any topsoil.
b. Excavate or fill to the bottom of the sub -grade.
c. Excess material hauled to one of two on-site stockpiles. One for general fill used for
filling operations, berm construction and daily cover and a second for liner quality clay.
® Groundwater Collection Layer
The purpose of this layer it to allow the ground water to move freely to be collected and
discharged at the surface to keep hydraulic pressure from pushing the liner up.
a. Floor is graded/sloped to direct any ground water to dug out trenches.
b. Geocomposite liner is laid over the entire surface to allow water to flow freely.
c. Clean rock is placed in the trenches and a perforated HDPE pipe is embedded in the rock.
® Clay Liner
a. 6 -inch Earth Barrier Layer is placed over the Geocomposite Groundwater
Drainage Layer to provide a firm surface to compact 2 -foot Clay Liner against.
b. 2 -foot Clay Liner is constructed.
i. Liner quality clay is placed in four 8 -inch (loose) or 6 -inch (compacted) lifts.
ii. The Clay Liner construction tested for density and permeability to verify it meets
the IDNR standard.
® Textured Liner
a. 60 -mil White HDPE Textured Liner is placed over the Clay Liner, overlapped
6 -inches, and seamed with a double -fusion machine.
b. The HDPE seam air channels is tested for leaks to confirm the seam is sealed.
Clayliner
Cushion Geotextile
5® Leachate Collection Layer
a. 32 -oz Cushion Geotextile is placed over the HDPE Liner to
prevent the leachate collection media from making holes in the
HDPE liner.
b. 12 -inch Perforated HDPE DR 11 pipe is placed in the trench
over 4 -inches of 1 -inch calcareous clear rock (not limestone).
Then the trench is filled with the same rock. The top of the
filled trench is covered with an 8 -oz Separation Geotextile to
prevent clogging.
c. 24 -inch Leachate Collection Layer consisting of Tire Derived
Aggregate (TDA) is placed over Geotextile.
® Temporary Berms
a. Temporary berms with rain guards are built around the
perimeter and inside the cell to prevent stormwater from
entering the leachate collection system.
C. Clean Layer
a. The cell is ready for a "clean" layer. The "clean" layer is typically
residential trash and does not contain bulky items. This layer
provides a filter to prevent the Leachate Collection layer from
clogging.
® Gas Collection Wells
a. Once the cell is filled, wells are drilled thru the waste to capture
the landfill gas (methane) that results from the decomposition
of waste materials. Eventually, the gas will travel through pipes to
a flare on the property where it will be burned/destroyed to reduce
greenhouse gas generation. This voluntary investement was a
policy decision by the Agency board.
® Final Closure System
Trash
(Vanes in Thickness
Sand Leachate
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>i eparation Geotextile
Compacted Clay Layer
Virgin Ground
Leachate Sand Drainage Layer
Separation Geotextile
7 Compacted Clay
Landfill Base
Community Impact of the Dubuque Metro Landfill
The DMASWA landfill is a regional facility that services
not only Dubuque county but Delaware county, portions
of Jackson and Clayton counties, Grant county in
Wisconsin, and Jo Daviess county in Illinois.
The DMASWA spends over $300,000 annually on routine
regulatory services to track water and air emissions to
monitor its impact on the environment.
Over $5 of the tipping fee is used to subsidize diversion
and household hazardous waste programs offered to
residents of Dubuque and Delaware counties.
In FY 2017, the DMASWA received over 130,000 tons
of waste with 86,000 from Dubuque county and 12,000
from Delaware county. The remaining tonnage assists
with reducing the Agency's fixed costs.
By voluntarily flaring the DMASWA landfill gas, the
DMASWA destroys over 98% of the methane gas
generated, which equates to a greenhouse gas reduction
of over 80,000 tons of CO2 annually.
If the DMASWA landfill gas it collects is cleaned, it
would provide an equivalent of over 1,000,000 gallons
of gasoline annually.
Over 242,500 cubic yards of soil have been removed as
part of this project. This is the equivalent to filling 75
Olympic -sized swimming pools.
Over 13,000 tons of recycled tires will be used to filter
the leachate in the landfill. This is the equivalent of over
1 million car tires.
In just this Cell 9 Phase III project, there will be over
one mile of piping installed to transport ground water
and leachate.
Dubuque Metropolitan Area Solid Waste Agency
The DMASWA is an intergovernmental entity formed in 1973 under
Chapter 28E of the Code of Iowa. Formed originally to own and operate
a sanitary landfill, the DMASWA has since broadened its mission.
DMASWA Mission Statement
In order to control current and future economic and environmental
liability, the mission of the Dubuque Metropolitan Area Solid Waste
Agency is to provide environmentally sound, financially stable, fiscally responsible, community recognized, solid waste
management services that include appropriate waste reduction, resource conservation, and disposal activities.
DubuqueMetropolitan Area Solid Waste Agency
DMASWA
providing environmentally sound solid waste solutions
Board of Directors members include the City of Dubuque, with two board representatives, and Dubuque County, with
one representative. All remaining municipalities in Dubuque and Delaware Counties have signed "Non -Member Service
Agreements."
Current Agency Board Members
• Ric Jones, Dubuque City Council
Agency Board Chair
• Jay Wickham, Dubuque County Board of Supervisors
Agency Board Vice Chair
• David Resnick, Dubuque City Council
Agency Board Member
Agency Administrative Staff
• John Klostermann, City of Dubuque Public Works Director Masterpiece on the Mississippi
• John Foster, Agency Administrator
• Doug Hughes, Facility Supervisor
• Bev Wagner, Communication & Education Coordinator
THE CITY OF
Dui
For more information on the DMASWA, visit www.dmaswa.org or call 563-557-8220.