Transcript Slide 1

Third Asphalt Shingle
Recycling Forum
Randy McMullin
Maine Department of Environmental
Protection
Why is New England different?
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Limited landfill space
Difficult or impossible to site a new commercial
landfill in many of the states
High landfill disposal fees $65-100+ per ton
Many states in the area already process various
Construction and Demolition materials for
assorted uses (namely CDD wood fuel)
Dense population although Maine is pretty rural
How is it working
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In Maine we recycle about 30,000 tons of tear off
shingles every year about 1/3 of what we generate.
Most go into a 50/50 mix of road base and some are
used in HBA at about a 2% mix. None goes to ME
DOT.
Shingles are collected at town transfer stations, roofing
contractors and we locals generally bring shingles to the
processing facility or transfer station facility.
Transportation is the limiting factor
Tipping fee is about $32 per ton.
What is in shingles anyway?
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Asphalt cement, generally organic (paper) backed
shingles contain about 30-36% asphalt and fiberglass
backed shingles contain 19-22% asphalt
Mineral filler/stabilizer (limestone, silica, dolomite, etc)
8-40% and is usually smaller than 0.15mm and most
~70% is smaller than 0.08mm. Sand sized minerals are
in the range of 20-38%
Old shingles that are 20-40 years old are usually organic
backed and newer shingles are usually fiberglass backed.
11 million tons per year (counting 1 million of factory
scraps)
Asbestos?
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In 1963 the content of asbestos in shingles was only
about 0.02% by weight
In 1977, the content of asbestos in shingles was only
0.00016% by weight
The chances of you finding ANY asbestos in tear off
roofing shingles is a about 0.8% of shingles [0.5%
show a trace, 0.17% show 2%, 0.11% show 5% (based
on 1770 samples as reported by Chelsea Center
2/2003)]
There is no asbestos in new factory rejects
Testing for Asbestos
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Cost to sample is generally $12-25 per sample.
Each incoming load may be required to be sampled at
least once.
Ground end product may also be sampled.
MA samples each incoming load at least once and also
the ground end product
NJ one sample per 500 tons outgoing
NC one sample per 30 tons incoming
ME does not require sampling any more
Metal Concentrations in ppm
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Arsenic
Barium
Cadmium
Chromium
Lead
Mercury
Selenium
Silver
5.6
63.4
< 1.09
26.7
81.4
0.17
<1.1
<1.63
cPAHs in shingles in ppb
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Benz[a] anthracene
Benzo[b]fluoranthene
Benzo[k]fluoranthene
Benzo[a]pyrene
Chrysene
Dibenz[ah]anthracene
Indeno[1,2,3-cd]pyrene
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42,500
48,000
10,000
33,500
29,000
5,800
25,000
Bottom Line
No metals are of a big concern if there is no
pathway of exposure.
 No PAHs including cPAHs are of a big concern
if there is no pathway of exposure
 Nothing would be deemed to be a “RCRA
hazardous waste” in shingles
 Asbestos is not an issue in new factory rejects
 Asbestos can be an issue in tear off shingles.
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DOT Issues
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Is the amount of asphalt in
the shingles consistent?
Can a mixture of shingles
meet DOT requirements for
strength, cracking, and
durability as well as virgin
asphalt?
Is there anything that would
increase DOT’s liability?
Does it save DOT any
money?
Any PR value?
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What % of shingles is good
for high traffic?
What % for other uses
including secondary roads,
streets, parking lots, bike
paths, sidewalks, etc?
Short term and long term
durability?
What about other additives
reactions (foamed asphalt,
RAP, crumb rubber,
SuperPave)? Is there a
problem?
DEP ISSUES
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For the processor……
Do they need a Solid Waste
License?
Dust? Stormwater? Air
Emissions License?
Does anything leach out of
the ground shingles?
Asbestos Testing Plan?
Is this disposal?
What about other materials
co-mingled in the shingles?
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For the Asphalt Plant
Do they need a Beneficial
Use or BUD license?
Air Emissions at the plant?
Storage or dust issues?
Processor Issues
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What kind of licenses or permits do we need to
do this? State? Local?
What kind of tipping fee vs the cost of landfill
disposal can we charge?
What kind of equipment do we need to process
to a specification size?
Do we have a market or end user?
Is there a PR bonus?
Processor Issues
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What kind of shingles do we want to process?
New or Tear Offs or Both?
What kind of testing is going to be required?
Do we need to modify our facility for storm
water management, storage, dust, or traffic
issues?
What other stuff might be mixed in with the
shingles?
How are the shingles going to get here?
Asphalt Plant Issues
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Changes in asphalt formulation to meet DOT specs?
QA/QC plan to prove it?
Operational issues for storage or handling?
Air emission issues?
Additional incurred expenses? Bag house maintenance
issues?
Is it cost effective?
Any PR bonus?
Different % mixes for different customers?
Other potential products such as 50/50 road base?
Suggestion
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Easiest way to get in the game would be to use new
shingles at a 2-5% replacement mix, but it has to meet
the DOT spec.
Partner up a “team” with a Solid Waste Processor,
Asphalt Plant, DOT, DEP, and perhaps the University
to do “pilot projects” (stretch of road, a parking lot,
bike paths, heavy truck roadway) if required.
Set up a “review team” to evaluate the project on a
schedule to answer the performance questions.
Capitalize on good PR.
Do your homework
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The addition of ground shingles will affect the 1) virgin
asphalt binder content and 2) the gradation properties
of the total aggregate size and fraction. You will need
to design the asphalt composition mix a little to meet
the DOT specs. Keep in mind that size of the ground
shingles counts in how much asphalt is incorporated in
the mix.
Pick up these reference materials to figure out the
changes in the HBA mix
AASHTO PP 53
AASHTO MP 15-2
Suggestion
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If tear off shingles are proposed to be used, come up with an
acceptable asbestos sampling plan to statistically verify and
certify that the ground shingles are acceptable for the end use.
All of the parties need to buy into this this plan.
Make provisions for any needed changes in the sampling plan for
more frequent/less frequent sampling, but make sure that the
end user or customer is part of that agreement.
Segregate the material to be tested until the results come back
from the lab if needed.
Address this issue up front in your project with your customers.
Questions to be asked
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What kind of permits or changes do I need for my
facility or to get a beneficial use license?
What kind of testing need I do to do to satisfy the
regulators with respect to asbestos or anything else?
What kind of pilot or test project would be required to
“prove the material” to satisfy DOT?
Is there a % of shingles in HBA that is “just OK”?
Could the University assist me in answering these
questions?
Quick Summary
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Recycled new and used shingles can work in
both HBA and in other products, but you have
to do some work to make it happen.
Concentrate on making sure that you are able to
deliver a consistent product that meets the needs
of the end user.
You need to be able to prove to the end user
that this is an acceptable replacement for virgin
asphalt.
Other people that you may want to
speak with….
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DEP /DOT Commissioner to get you to the
correct people for your project
Someone from the State Pollution Prevention
(P2), State Recycling, or the State Planning
Office
Resource Materials Recycling Center
www.rmrc.unh.edu
AASHTO for reference materials
Shingles to be processed
Hot Batch Asphalt
Parking Lot
Town Road
Cold Patch
Private road
Subdivision road
Driveway
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Randy McMullin
Environmental Specialist
Beneficial Use of Solid
Waste Program
Maine Department of
Environmental Protection
Randy.L.McMullin
@maine.gov
(207) 822-6343