Martin Marietta Materials – Asphalt Plant
Air Quality Advisory Board Meeting
April 21, 2014
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Asphalt Plants-Background
• Produce asphalt
– sand, rocks, asphalt cement, emulsifier, additives
• Portable
• Drum or batch
• Located near source of aggregate
• Located near major projects
• Hot mix, warm mix, recycled asphalt product
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Asphalt Plants - Emissions
• Pollutants
– CO, NOx, SO2, VOCs
– Particulate Matter
– HAPs (benzene, PAHs)
• Sources of emissions
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Dryer
Tank and silo vents
Heaters for liquid storage tanks and silos
Vehicles
Diesel generators
Materials handling and storage piles
Load out into silos and trucks
Asphalt Plants - Regulations
• NSPS 40 CFR Part 60 Subpart I
– Emission standards and stack testing for particulate matter
• No Federal standard for HAPs
– EPA determined asphalt plants are not major sources
• CDPHE requires APEN and Construction Permit
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Emission and production limits (Reg. No. 1 and 3)
NSPS for HMA and fuel burning equipment (Reg. No. 6)
Operation and Maintenance Plan (Reg. No. 3)
Dust control plan (Reg. No. 1)
Odor (Reg. No. 2)
• Larimer County
– Odor and dust requirements and land use approval
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Asphalt Plants – Air permit
• All Hot Mix Asphalt plants (HMAs) must file APEN and
obtain permit from CDPHE
• Construction or Operating permit
<100 TPY or synthetic minor in non-attainment area
• Fixed (stationary) or portable
• File Notice of Relocation when moving
• 30 day public comment period
• Inspected every 3-5 years
• Permit valid for 5 years
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Asphalt Plants – Air permit
• Stack testing for PM and CO
• Air dispersion modeling for CO
• Emission inventory for criteria pollutants and HAPs
• Emission and production limits
• Pollution control equipment
• Record keeping and compliance requirements
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MMM Asphalt Plant – Air Permit
• Air permit since 1997
• Completed initial stack testing
• Several owners and locations
• Air permit modified 3 times
– 2001, 2003, 2013
• Moved to current location in 2011
– 1800 N. Taft Hill Rd.
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MMM Asphalt Plant – Air Permit
• Converting to fixed (stationary) source
– Application for synthetic minor
• CDPHE has conducted air dispersion
modeling for CO
• Draft air permit to be released soon
• Current production limit = 600,000 TPY
TSP
20.3
Acetaldehyde
780
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Annual Air Pollutant Emission Limits (TPY)
PM10
PM2.5
SO2
NOx
VOC
9.6
4.8
17.4
16.5
15.1
Estimated Hazardous Air Pollutant Emissions (lbs/yr)
Benzene Formaldehyde
HCl
Quinone
238
1920
126
96
CO
11.4
Toluene
1740
MMM Asphalt Plant – Larimer County
• County Commissioners authorized a special review
approval for gravel mining operations thru land use permit
process in July 1985
• Asphalt plant authorized as an accessory use
• County Commissioners approved a Special Review to
relocate plant and to exceed maximum structure height in
March 2009
• LC Dept. of Health and Environment conducts inspections
and responds to complaints for this facility. Last inspection
in July 2013
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MMM Asphalt Plant – City of Fort Collins
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City obtains most of its asphalt from MMM and uses over 50% of
asphalt produced by plant
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Recently renewed 5 yr. multi-million $ contract
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Staff conducted analysis to inform contract decision
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City uses primarily warm mix asphalt and some concrete
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Staff revising LCUASS to allow more warm mix and RAP
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Staff and Councilmembers have visited site, and engaged with
citizens, operators, county, state
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City collaborating with County on draft air permit review
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City Manager advocated for public hearing
MMM Asphalt Plant - AQAB
• Review draft air permit
• Evaluate CDPHE’s analysis
• Consider additional information from CAAT and
MMM
• Consider additional information from staff and
consultant
• Provide recommendation to Council
• May need to form subcommittee
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Questions?
Melissa Hovey – Sr. Environmental Planner (Air Quality)
970-221-6813 [email protected]
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