Technical Review of Draft Permit 13LR2446 Martin Marietta Materials
Prepared by:
D. Howard Gebhart
Air Resource Specialists, Inc.
1901 Sharp Point Drive, Suite E
Fort Collins, CO 80525
970‐484‐7941
hgebhart@air‐resource.com
Overview of ARS Work
“Review of the Review” conducted by APCD –
Limited to issues associated with air permit
• Review Draft Air Permit and Permit Conditions
• Review Air Emissions Inventory that Supports the MMM Draft Permit
• Review Air Dispersion Modeling that Supports the MMM Draft Permit
• Assess Potential Public Health Impacts of Hazardous Air Pollutant (HAP) Emissions
• Summarize Findings in a Technical Report • Present Findings to a Meeting(s) of the ESAB and AQAB.
Martin Marietta Materials Google Earth Image
*Star indicates the MMM Asphalt Location
Asphalt Batch Plant
MMM Emission Controls
• Baghouse
• Recycle VOCs from Product Conveyor
• Condensers on Liquid Asphalt Tanks
Photo from MMM Product Conveyor
Emissions Data Criteria Pollutants
MMM Emissions (ton/yr)
Stack
Fugitive
Total
PM
5.4
3.7
9.1
PM10
1.8
0.9
2.7
Emissions Basis:
NOX, SO2, VOCs – AP‐42
PM, PM10, PM2.5 – NSPS
CO – APCD
PM2.5
1.3
0.1
1.4
NOX
6.5
SO2
0.8
VOC
7.6
CO
72.2
Emissions Data Hazardous Air Pollutants
MMM Emissions (lbs/yr)
Acetaldehyde Formaldehyde Toluene Benzene Ethylbenzene Quinone
618
1,473
1,378
185
114
76
HCl
95
Benzene
Ethylbenzene
Formaldehyde
– AP‐42
– AP‐42
– AP‐42
Acetaldehyde
Quinone
HCl
– APCD
– APCD
– APCD
Toluene – AP‐42/Fuel Oil
Hexane
Xylene
– Not Calculated
– Not Calculated
Modeling – CO Emissions
• AERSCREEN Version 11126
• CO Emissions – 160 lb/hr (0.4 lb/ton @ 400 tph)
– 8 hour = 1 hour x 0.9
– Background – Fort Collins, Carbon Monoxide (CO) Monitor
– Building Down Wash
• Lime Silo
• Asphalt Storage Silos
• Baghouse Structure
Image – Martin Marietta Materials
(from APCD Modeling Report)
1‐Hour Average CO Impacts – Martin Marietta Materials
Micrograms per cubic meter
Building Configuration
AERSCREEN Concentration
Background Concentration
Total Concentration
NAAQS
Lime Silo
7,203
5,750
12,953
40,000
Product Silo
4,639
5,750
10,389
40,000
Baghouse Building
3,078
5,750
8.828
40,000
8‐Hour Average CO Impacts – Martin Marietta Materials
Micrograms per cubic meter
Building Configuration
AERSCREEN Concentration
Background Concentration
Total Concentration
NAAQS
Lime Silo
6,483
3,450
9,933
10,000
Product Silo
4,175
3,450
7,625
10,000
Baghouse Building
2,770
3,450
6,220
10,000
APCD Modeling Conservatisms
•
•
•
•
Building Configuration
0.9 8‐Hour Scaling Factor
LPG vs. Natural Gas Emissions
CO Background
HAP Modeling Analysis
• Extrapolated from APCD CO Modeling Data
• Three Receptors
– Residence near trailhead parking lot
– Stonecrest Drive (3rd house)
– Lincoln Middle School
Location of Public receptors near MMM
Distance (meters)
Azimuth
(degrees from North)
Residence near Trailhead
239
160.2
Worst‐Case AERSCREEN
Model Result
(ug/cubic meter)
232.9
Stonecrest Drive (3rd House)
Lincoln Middle School
(NW Corner of school building)
632
194.3
146.7
1,130
155.6
13.57
Acute Impacts
Calculated 1‐Hour Average HAP Exposure
(ug/cubic meter)
“Safe” Concentration Receptor: Receptor:
Threshold
Stonecrest Lincoln Middle rd
(ug/cubic Drive (3
School: meter)
AERSCREEN = House): 13.57 ug/ AERSCREEN = cubic meter
146.7 ug/ cubic meter
9.6
0.9
470
Pollutant
Max Hourly Emissions (g/sec)
Acetaldehyde
0.0656
Receptor: Residence near Trailhead: AERSCREEN = 232.9 ug/ cubic meter
15.3
Formaldehyde
0.1564
36.4
22.9
2.1
55
Toluene
0.0076
1.8
1.1
0.1
37,000
Benzene
0.0197
4.6
2.9
0.3
1,300
Ethylbenzene
0.0121
2.8
1.8
0.2
140,000
Quinone
Hydrogen Chloride
0.0081
1.9
1.2
0.1
10,000
0.0101
2.3
1.5
0.1
2,100
Chronic Impacts
Calculated 1‐Hour Average HAP Exposure
(ug/cubic meter)
“Safe” Concentration Receptor: Receptor:
Threshold
Stonecrest Lincoln Middle (ug/cubic Drive (3rd
School: meter)
AERSCREEN = House): 13.57 ug/ AERSCREEN = cubic meter
146.7 ug/ cubic meter
0.130
0.012
2.2
Pollutant
Max Hourly Emissions (g/sec)
Acetaldehyde*
0.0089
Receptor: Residence near Trailhead: AERSCREEN = 232.9 ug/ cubic meter
0.207
Formaldehyde*
0.0212
0.494
0.311
0.029
13
Toluene
0.0010
0.024
0.015
0.001
5,000
Benzene*
0.0027
0.062
0.039
0.004
7.80
Ethylbenzene*
0.0016
0.038
0.024
0.002
2.50
Quinone
Hydrogen Chloride
0.0011
0.025
0.016
0.001
n/a
0.0014
0.032
0.020
0.002
20
*Star denotes carcinogenic HAPs
Comments on MMM Draft Permit
•
•
•
•
•
•
•
HAP Emissions
Consideration of other MMM sources
Operating and Maintenance Plan
MMM Control Equipment
RACT/VOC Emissions
Testing – Natural Gas & LPG Fuels
HAP Emission Testing
Questions or Comments?
D. Howard Gebhart
Air Resource Specialists, Inc.
1901 Sharp Point Drive, Suite E
Fort Collins, CO 80525
970‐484‐7941
hgebhart@air‐resource.com