E

C

/R Incorporated Providing Environmental Technical Support Since 1989

501 Eastowne Drive, Suite 250  Chapel Hill, North Carolina 27514

Telephone: (919)484-0222  Fax: (919) 484-0122

MEMORANDUM

Date: September 27, 2010

To: Terri Hollingsworth, U.S. EPA/OAQPS/HEID

CC: Ted Palma, U.S. EPA/OAQPS/HEID

From: Nancy Jones, EC/R Incorporated 

Subject: Draft Modeling Comparison of BLP and AERMOD for Primary Aluminum

1. Introduction

This memo describes an air dispersion modeling comparison conducted between The 

Bouyant Line and Point (BLP) model and the American Meteorological Society (AMS) and EPA 

Regulatory Model (AERMOD) contained within the Human Exposure Model version 3 (HEM3).

BLP was developed for the Aluminum Association approximately 30 years ago to account for 

the unique release characteristics of the long and hot potrooms characteristic of primary

aluminum smelters. The result of the modeling comparison was that the output of both the BLP 

model and HEM3 resulted in nearly the same risks for the pollutants modeled. The cancer risk 

estimates for the maximum individual risk to the person most exposed (MIR) and the noncancer 

hazard quotient (HQ) were of the same order of magnitude and within fifty percent of each other.

Section 2 of this memorandum presents the facility source characteristics provided by 

EPA. Section 3 presents the emissions estimates and toxicity inputs used in the analysis and 

Section 4 discusses the air dispersion modeling. Results of the comparison are presented in 

Section 5.

2. Source Characterization

EPA provided the source locations and release characteristics for a primary aluminum 

facility located in Montana that was used in this comparison. An aerial photograph and sketch of 

the details of each potroom are presented in Figures 1 and 2. As seen in the figure there are 10 

potrooms. The potrooms were modeled in BLP as line sources and in HEM3 as narrow area 

sources. EPA’s release characteristics of the 10 potrooms (line/area sources) are a vent height of 

60 feet, vent length of 1,014 feet, vent width of 9 feet, with a median temperature of 76 degrees 

Fahrenheit. There are also 11 point sources. Ten of the eleven point sources are alumina 

scrubber stacks and had stack heights of 111 feet, stack diameters of 3.2 feet, exit temperatures 

of 232 degrees Fahrenheit, and exit velocities of 61 feet per second. The remaining stack, for 

the paste plant scrubber, was modeled as 71 feet tall with a diameter of 2.75 feet, with the same 

exit temperature and flow rate as the other stacks. Table 1 presents the source identifiers and their 

locations. 
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

2

Figure 1. Primary Aluminum Smelter Plant Layout

Figure 2. Typical Potroom Roof Detail - Top View
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

3

Table 1. Primary Aluminum Smelter Emissions Unit IDs and Locations Provided by EPA

Potroom Line/Area Sources

Emission 

Unit ID Unit Description

Latitude of 

Midpoint

(degrees)

Longitude of 

Midpoint

(degrees)

EU034 Potline #1 Roof Vent, POTROOM 1 48 23.589' 114 8.231' 

Potline #1 Roof Vent, POTROOM 2 48 23.589' 114 8.187' 

EU035 Potline #2 Roof Vent, POTROOM 3 48 23.589' 114 8.144' 

Potline #2 Roof Vent, POTROOM 4 48 23.589' 114 8.107' 

EU036 Potline #3 Roof Vent, POTROOM 5 48 23.589' 114 8.026' 

Potline #3 Roof Vent, POTROOM 6 48 23.589' 114 7.985' 

EU037 Potline #4 Roof Vent, POTROOM 7 48 23.589' 114 7.944' 

Potline #4 Roof Vent, POTROOM 8 48 23.589' 114 7.907' 

EU038 Potline #5 Roof Vent, POTROOM 9 48 23.589' 114 7.862' 

Potline #5 Roof Vent, POTROOM 10 48 23.589' 114 7.821' 

Point Sources

Emission 

unit ID Unit Description

Lat.

(degrees)

Long.

(degrees)

EU015 & 

EU016 Paste Plant Extruder - PP01 & Paste Plant Mixer - PP02 48 23.715' 114 8.211'

EU024 Primary Gas Collection System - West Plant (Potlines 1 & 2) - AR05 48 23.599' 114 8.168'

EU025 Primary Gas Collection System - West Plant (Potlines 1 & 2) - AR05 48 23.602' 114 8.168'

EU026 Primary Gas Collection System - West Plant (Potlines 1 & 2) - AR05 48 23.605' 114 8.168'

EU027 Primary Gas Collection System - West Plant (Potlines 1 & 2) - AR05 48 23.607' 114 8.168'

EU028 Primary Gas Collection System - East Plant (Potlines 3, 4, & 5) - AR05 48 23.601' 114 7.964'

EU029 Primary Gas Collection System - East Plant (Potlines 3, 4, & 5) - AR05 48 23.604' 114 7.964'

EU030 Primary Gas Collection System - East Plant (Potlines 3, 4, & 5) - AR05 48 23.606' 114 7.964'

EU031 Primary Gas Collection System - East Plant (Potlines 3, 4, & 5) - AR05 48 23.609' 114 7.964'

EU032 Primary Gas Collection System - East Plant (Potlines 3, 4, & 5) - AR05 48 23.611' 114 7.964'

EU033 Primary Gas Collection System - East Plant (Potlines 3, 4, & 5) - AR05 48 23.614' 114 7.964'

3. Emissions Estimates and Toxicity Inputs

EPA provided emissions estimates of 20 polycyclic aromatic hydrocarbons (PAH) 

emitted from the facility. Nineteen of the compounds were assigned to various polycyclic 

organic matter (POM) groups for modeling within HEM3 based on the approach used in the 

National-Scale Air Toxics Assessment (NATA)1. These groups each have their own 

carcinogenic unit risk estimate (URE) based on their relative potency to benzo(a)pyrene. 

Naphthalene, which does not have a URE, was not assigned to a group and was the only 

compound to have a reference compound (RfC) for estimating noncancer adverse health impacts. 

Once the individual POMs are assigned to groups, all HAP emissions in the group are summed 

to have one emissions estimate per group. Its chronic RfC is 0.003 milligrams per cubic meter 

(mg/m3). Table 2 identifies the POM group, the compounds modeled assigned to the groups, and 

 

1

http://www.epa.gov/ttn/atw/natamain/
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

4

the group URE. Emissions were provided by EPA in units of tons per year (TPY) and modeled 

as such in HEM3. For BLP, the emissions were converted to grams per second (g/s) based on 

the assumption of continuous operation throughout the year (8,760 hours per year). Table 3 

identifies the source specific emissions as modeled, while Attachment 1 contains the detailed 

emissions data received from EPA.

4. Air Dispersion Modeling

BLP

2

is a Gaussian plume dispersion model designed to handle unique modeling 

problems associated with aluminum reduction plants, and other industrial sources where plume 

rise and downwash effects from stationary line sources are important. Since the time BLP was 

developed, EPA has developed more advanced models than the preferred model of the day. BLP 

uses a single value, F prime (F’), to account for the buoyancy of a building’s release and the 

building’s parameters (BLP User’s Guide Equation 2-47). For this application we calculated an 

F’ value of 45 m4/s3. BLP is cumbersome to use and must be run separately for each pollutant. 

HEM3 contains as its dispersion model the EPA’s regulatory model AERMOD2. AERMOD 

incorporates air dispersion based on planetary boundary layer turbulence structure and scaling 

concepts, including treatment of both surface and elevated sources, and both simple and complex 

terrain. AERMOD contains algorithms to calculate plume rise. BPIPPRIME, calculates the 

impacts of buildings on the dispersion of releases.3 

HEM3 contains not only the AERMOD dispersion model, but also datasets of toxicity

information, terrain, meteorological files, census data at the block level, and algorithms for 

combining the model results and data to estimate risk. When possible we used HEM3 as a 

consistent data source for both model inputs and to calculate risks. However, BLP does not 

calculate risks thus the BLP risk estimates were prepared using a spreadsheet and only the MIR 

was calculated and will be compared to the HEM3 run. HEM3 is being run to estimate residual 

risk for the other source categories and so many of the processing steps have been automated. 

Automation not only results in a much lower level of effort, it also eliminates opportunities for 

potential human error.

We used the Universal Transform Mercator (UTM) coordinate system rather than latitude 

and longitude for both the BLP and the HEM3 models so the coordinates provided by EPA were 

converted from decimal degrees of latitude and longitude to UTM coordinates using one of many 

converters available on the web4. Tables 4 through 6 presents the locations of the emissions 

sources as modeled together with the base elevations for the sources and receptors, and the hill 

height scale for the receptors, obtained from HEM3. HEM3 was used to identify the 30 

receptors, the census block centroids within 3,000 meters of the facility center (see Table 7). 

Other options selected for the modeling in both BLP and HEM3 are presented in Table 8.

 

2

http://www.epa.gov/ttn/scram/dispersion_prefrec.htm#other

3 However, in order to model with HEM3 for this source category as EPA is modeling others for which building 

characteristics are not known, for this application we did not include the use of BPIPPRIME. The result is a 

comparison of BLP and HEM3 as it is being run for estimating residual risk, not a comparison of the most precise 

way to model the facility using each of the models.

4

http://gis.dep.wv.gov/convert/llutm_conus.php
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

5

Table 2. POM Group Codes and Modeled Compounds 

POM Group Code Compounds Modeled in Group Group URE (1/(μg/m3))

72002 2-chloronaphthalene, 2-methylnaphthalene, acenapthene, acenapthylene, anthracene, benzo(e)pyrene, 

benzo(g,h,i)perylene, fluoranther, fluorine, perylene, phenanthrene, pyrene

8.80 x 10-5

75002 Benzo(a)pyrene, dibenzo(a,h)anthracene 1.6 x 10-3

76002 Benz(a)anthracene, benzo(b)fluoranthene, benzo(k)fluoranthene, ideno(1,2,3-c,d)pyrene 1.6 x 10-4

77002 Chrysene 1.6 x 10-5

Table 3. Source Specific Emissions as Modeled

EPA Source IDs Model ID

POM 72002 Emissions POM 75002 Emissions POM 76002 Emissions POM 77002 Emissions Naphthalene Emissions

(TPY) (g/s) (TPY) (g/s) (TPY) (g/s) (TPY) (g/s) (TPY) (g/s)

EU 15 & 16 EU01516 2.31E-02 6.66E-04 5.73E-05 1.65E-06 2.58E-04 7.43E-06 1.48E-04 4.25E-06 6.37E-04 1.83E-05

EU024 EU024 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU025 EU025 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU026 EU026 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU027 EU027 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU028 EU028 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU029 EU029 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU030 EU030 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU031 EU031 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU032 EU032 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU033 EU033 7.80E-03 2.24E-04 4.27E-05 1.23E-06 3.07E-04 8.84E-06 2.04E-04 5.85E-06 2.75E-04 7.90E-06

EU34 Potroom 1 EU034R1 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU34 Potroom 2 EU034R2 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU35 Potroom 3 EU035R3 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU 35 Potroom 4 EU035R4 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU36 Potroom 5 EU036R5 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU36 Potroom 6 EU036R6 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU37 Potroom 7 EU037R7 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU37 Potroom 8 EU037R8 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU38 Potroom 9 EU038R9 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04

EU38 Potroom 10 EU038R10 4.11E+00 1.18E-01 6.87E-01 1.98E-02 1.35E-01 3.88E-03 3.97E-01 1.14E-02 5.64E-03 1.62E-04
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

6

Table 4. Point Source Locations, Elevations and Release Characteristics Used in BLP and 

AERMOD

Source 

ID

UTM Zone 11

Easting

UTM Zone 11

Northing

Base 

Elevation

Stack 

Height Temperature

Exit 

Velocity

Stack 

Diameter

(m) (m) (m) (m) (°K) (m/s) (m)

EU1516 711,931 5,364,193 946 21.6 384.1 18.59 0.8

EU24 711,992 5,363,980 946 33.8 384.1 18.59 1

EU25 711,992 5,363,986 946 33.8 384.1 18.59 1

EU26 711,992 5,363,991 946 33.8 384.1 18.59 1

EU27 711,992 5,363,995 946 33.8 384.1 18.59 1

EU28 712,244 5,363,993 946 33.8 384.1 18.59 1

EU29 712,244 5,363,999 946 33.8 384.1 18.59 1

EU30 712,244 5,364,003 946 33.8 384.1 18.59 1

EU31 712,243 5,364,008 946 33.8 384.1 18.59 1

EU32 712,243 5,364,012 946 33.8 384.1 18.59 1

EU33 712,243 5,364,018 946 33.8 384.1 18.59 1

Table 5. Area Source Locations, Elevations and Release Characteristics Used in AERMOD

Source ID

UTM Zone 

11 Easting

UTM Zone 11 

Northing

Base 

Elevation

Release 

Height

Easterly 

Length

Northerly 

Length

Angle from

North

(m) (m) (m) (m) (m) (m) (°)

EU34R1 711,915 5,363,804 946 18.29 1 310 0

EU43R2 711,969 5,363,806 946 18.29 1 310 0

EU35R3 712,022 5,363,807 946 18.29 1 310 0

EU35R4 712,067 5,363,809 946 18.29 1 310 0

EU36R5 712,167 5,363,812 946 18.29 1 310 0

EU36R6 712,218 5,363,814 946 18.29 1 310 0

EU37R7 712,268 5,363,816 946 18.29 1 310 0

EU37R8 712,314 5,363,818 946 18.29 1 310 0

EU38R9 712,371 5,363,820 946 18.29 1 310 0

EU38R10 712,421 5,363,822 946 18.29 1 310 0
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

7

Table 6. Line Source Locations, Elevations and Release Characteristics Used in BLP

Source ID

Starting 

UTM Zone 

11 Easting

Starting 

UTM Zone 

11 Northing

Ending 

UTM Zone 

11 Easting

Ending 

UTM Zone 

11 Northing

Base 

Elevation

Release 

Height

Angle from

North

(m) (m) (m) (m) (m) (m) (°)

EU34R1 711,915 5,363,804 711,916 5,364,114 946 18.29 0

EU43R2 711,969 5,363,806 711,970 5,364,116 946 18.29 0

EU35R3 712,022 5,363,807 712,023 5,364,117 946 18.29 0

EU35R4 712,067 5,363,809 712,068 5,364,119 946 18.29 0

EU36R5 712,167 5,363,812 712,168 5,364,122 946 18.29 0

EU36R6 712,218 5,363,814 712,219 5,364,124 946 18.29 0

EU37R7 712,268 5,363,816 712,269 5,364,126 946 18.29 0

EU37R8 712,314 5,363,818 712,315 5,364,128 946 18.29 0

EU38R9 712,371 5,363,820 712,372 5,364,130 946 18.29 0

EU38R10 712,421 5,363,822 712,422 5,364,132 946 18.29 0
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

8

Table 7. Receptor Locations and Elevations Used in BLP and AERMOD

Receptor #

UTM Zone 11 Easting

(m)

UTM Zone 11 Northing

(m)

Elevation

(m)

Hill Height 1

(m)

1 710,579 5,365,495 975 1,766

2 709,782 5,363,750 925 1,766

3 710,602 5,363,941 922 1,766

4 711,026 5,364,756 934 1,766

5 712,873 5,363,756 946 1,766

6 711,025 5,363,618 914 1,766

7 710,111 5,363,744 921 1,766

8 710,022 5,363,739 923 1,766

9 709,923 5,363,736 924 1,766

10 709,738 5,363,591 924 1,766

11 710,045 5,363,194 916 1,766

12 710,125 5,363,439 918 1,766

13 710,152 5,363,551 919 1,766

14 710,114 5,363,641 920 1,766

15 710,026 5,363,638 921 1,766

16 709,928 5,363,634 921 1,766

17 709,931 5,363,543 920 1,766

18 710,029 5,363,545 920 1,766

19 710,682 5,363,311 914 1,766

20 709,728 5,362,725 915 1,608

21 709,959 5,362,815 914 1,766

22 712,556 5,362,875 914 1,766

23 710,851 5,362,241 914 1,608

24 710,961 5,361,328 918 1,608

25 712,023 5,361,413 929 1,608

26 711,908 5,361,263 927 1,608

27 713,154 5,362,334 974 1,766

28 712,997 5,362,493 962 1,766

29 712,426 5,361,845 940 1,766

30 712,473 5,361,524 949 1,766

1 Hill height used in AERMOD modeling only

Table 8. Modeling Options for the Model Comparison of BLP and AERMOD

AERMOD Options Value

Rural land use, no deposition or 

depletion, terrain option

Site specific terrain values from HEM3. 

Receptors Census blocks within 3,000 m of facility center.

Meteorological Data Great Falls, MT 1991 AERMET file from within HEM3.
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

9

5. Results

When modeled using terrain, the standard method used in residual risk assessments, the 

HEM3 MIR was estimated to be 1.28 x 10-4excess cancer cases per million of people exposed

(see Table 9). The HQ for naphthalene, the only compound with an RfC, was 0.00035. Figure 3 

shows the location of the MIR as well as uses color coding to identify the approximate risk 

estimate for each census block. 

For the BLP modeling with terrain, the MIR was estimated to be 1.59 x10-4excess cancer 

cases per million of people exposed and the HQ for naphthalene was 0.00020. Appendix W, The 

Guideline on Air Quality Models, recommends the BLP not be run using the terrain option. In a 

BLP run without terrain the same maximum risks were estimated as when terrain was used and 

they occurred at the same receptor. A comparison of the air concentration results from BLP 

with and without terrain is presented in Attachment 2. The maximum values with and without 

terrain occur at a receptor close to the facility where terrain does not have a large impact on the 

results. However, the attachment shows that at other receptors there is a difference in the 

modeling results when terrain is used.

Table 9. Maximum Risk Estimates for Both BLP and AERMOD Occur at the 

Populated Census Block at UTM Zone 11 712,873 m Easting, 5,363,756 m Northing

Model MIR HQ

BLP with Terrain 1.59 x 10-40.00020

BLP without Terrain 1.59 x 10-40.00020

HEM3 with Terrain 1.28 x 10-40.00035

Considering the uncertainties of dispersion modeling and the uncertainties of the data on 

release characteristics and emission rates that become the model input, the values estimated 

using both HEM3 and BLP can be considered are the same within that range of uncertainty. The 

reason that HEM3 is able to nearly replicate BLP’s risk estimates may be attributed to the 

continuing refinement of EPA’s air dispersion models from the time that BLP was developed 30 

years ago to today. 
Primary Aluminum Smelting Dispersion Modeling Comparison

September 27, 2010 

10

Figure 3. Location of the MIR from the HEM3 Modeling (Same Location as the MIR from the BLP Modeling) is at the Red X

Note: Census blocks depicted in green are estimated to have an MIR less than 1 in one million, blocks in yellow are estimated to have an MIR 

between 1 and 10 in one million, and blocks in red are estimated to have an MIR greater than 100 in one million.
Attachment 1

Emissions Estimates Received from EPA

1

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU024 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU024 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU024 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU024 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU024 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU024 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU024 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU024 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU024 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU024 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU024 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU024 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU024 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU024 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU024 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU024 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU024 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU024 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU024 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU024 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU025 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU025 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU025 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU025 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU025 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU025 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU025 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU025 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU025 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU025 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU025 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU025 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU025 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU025 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU025 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU025 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU025 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU025 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU025 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU025 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU026 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU026 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05
2

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU026 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU026 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU026 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU026 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU026 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU026 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU026 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU026 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU026 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU026 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU026 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU026 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU026 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU026 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU026 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU026 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU026 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU026 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU027 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU027 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU027 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU027 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU027 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU027 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU027 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU027 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU027 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU027 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU027 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU027 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU027 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU027 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU027 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU027 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU027 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU027 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU027 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU027 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU028 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU028 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU028 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU028 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05
3

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU028 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU028 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU028 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU028 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU028 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU028 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU028 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU028 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU028 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU028 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU028 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU028 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU028 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU028 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU028 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU028 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU029 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU029 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU029 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU029 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU029 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU029 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU029 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU029 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU029 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU029 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU029 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU029 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU029 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU029 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU029 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU029 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU029 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU029 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU029 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU029 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU030 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU030 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU030 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU030 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU030 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU030 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04
4

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU030 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU030 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU030 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU030 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU030 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU030 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU030 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU030 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU030 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU030 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU030 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU030 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU030 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU030 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU031 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU031 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU031 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU031 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU031 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU031 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU031 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU031 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU031 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU031 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU031 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU031 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU031 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU031 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU031 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU031 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU031 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU031 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU031 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU031 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU032 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU032 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU032 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU032 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU032 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU032 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU032 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU032 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05
5

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU032 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU032 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU032 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU032 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU032 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU032 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU032 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU032 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU032 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU032 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU032 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU032 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU033 POTLINE SCRUBBER 30300103 83329 ACENAPHTHENE 5.80E-05

EU033 POTLINE SCRUBBER 30300103 208968 ACENAPHTHYLENE 3.46E-05

EU033 POTLINE SCRUBBER 30300103 120127 ANTHRACENE 3.05E-05

EU033 POTLINE SCRUBBER 30300103 56553 BENZO(A)ANTHRACENE 9.56E-05

EU033 POTLINE SCRUBBER 30300103 50328 BENZO(A)PYRENE 4.27E-05

EU033 POTLINE SCRUBBER 30300103 205992 BENZO(B)FLUORANTHENE 1.22E-04

EU033 POTLINE SCRUBBER 30300103 192972 BENZO(E)PYRENE 4.68E-05

EU033 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E-05

EU033 POTLINE SCRUBBER 30300103 207089 BENZO(K)FLUORANTHENE 4.48E-05

EU033 POTLINE SCRUBBER 30300103 91587 2-CHLORONAPHTHALENE 5.60E-05

EU033 POTLINE SCRUBBER 30300103 218019 CHRYSENE 2.04E-04

EU033 POTLINE SCRUBBER 30300103 53703 DIBENZO(A,H)ANTHRACENE 4.58E-05

EU033 POTLINE SCRUBBER 30300103 206440 FLUORANTHENE 2.85E-03

EU033 POTLINE SCRUBBER 30300103 86737 FLUORENE 1.12E-04

EU033 POTLINE SCRUBBER 30300103 193395 INDENO(1,2,3-CD)PYRENE 4.48E-05

EU033 POTLINE SCRUBBER 30300103 91576 2-METHYLNAPHTHALENE 4.58E-05

EU033 POTLINE SCRUBBER 30300103 91203 NAPHTHALENE 2.75E-04

EU033 POTLINE SCRUBBER 30300103 198550 PERYLENE 4.27E-05

EU033 POTLINE SCRUBBER 30300103 85018 PHENANTHRENE 3.05E-03

EU033 POTLINE SCRUBBER 30300103 129000 PYRENE 1.42E-03

EU034 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU034 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU034 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU034 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU034 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU034 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU034 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU034 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU034 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU034 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03
6

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU034 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU034 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU034 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU034 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU034 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU034 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU034 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU034 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU034 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU034 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU034 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU034 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU034 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU034 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU034 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU034 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU034 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU034 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU034 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU034 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU034 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU034 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU034 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU034 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU034 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU034 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU034 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU034 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU034 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU034 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU035 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU035 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU035 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU035 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU035 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU035 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU035 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU035 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU035 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU035 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU035 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU035 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03
7

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU035 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU035 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU035 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU035 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU035 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU035 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU035 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU035 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU035 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU035 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU035 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU035 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU035 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU035 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU035 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU035 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU035 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU035 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU035 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU035 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU035 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU035 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU035 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU035 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU035 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU035 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU035 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU035 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU036 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU036 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU036 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU036 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU036 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU036 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU036 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU036 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU036 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU036 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU036 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU036 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU036 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU036 ROOF VENT 30300107 86737 FLUORENE 6.87E-02
8

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU036 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU036 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU036 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU036 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU036 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU036 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU036 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU036 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU036 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU036 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU036 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU036 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU036 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU036 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU036 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU036 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU036 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU036 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU036 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU036 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU036 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU036 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU036 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU036 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU036 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU036 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU037 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU037 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU037 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU037 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU037 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU037 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU037 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU037 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU037 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU037 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU037 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU037 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU037 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU037 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU037 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU037 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03
9

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU037 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU037 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU037 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU037 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU037 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU037 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU037 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU037 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU037 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU037 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU037 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU037 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU037 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU037 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU037 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU037 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU037 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU037 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU037 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU037 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU037 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU037 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU037 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU037 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU038 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU038 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU038 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU038 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU038 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU038 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU038 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU038 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU038 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU038 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU038 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU038 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU038 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU038 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU038 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU038 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU038 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU038 ROOF VENT 30300107 198550 PERYLENE 3.39E-02
10

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU038 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU038 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU038 ROOF VENT 30300107 83329 ACENAPHTHENE 1.67E-02

EU038 ROOF VENT 30300107 208968 ACENAPHTHYLENE 5.40E-03

EU038 ROOF VENT 30300107 120127 ANTHRACENE 2.21E-01

EU038 ROOF VENT 30300107 56553 BENZO(A)ANTHRACENE 2.40E-01

EU038 ROOF VENT 30300107 50328 BENZO(A)PYRENE 1.28E-01

EU038 ROOF VENT 30300107 205992 BENZO(B)FLUORANTHENE 2.94E-01

EU038 ROOF VENT 30300107 192972 BENZO(E)PYRENE 1.28E-01

EU038 ROOF VENT 30300107 191242 BENZO(G,H,I)PERYLENE 8.34E-02

EU038 ROOF VENT 30300107 207089 BENZO(K)FLUORANTHENE 8.34E-02

EU038 ROOF VENT 30300107 91587 2-CHLORONAPHTHALENE 9.32E-03

EU038 ROOF VENT 30300107 218019 CHRYSENE 3.97E-01

EU038 ROOF VENT 30300107 53703 DIBENZO(A,H)ANTHRACENE 7.36E-03

EU038 ROOF VENT 30300107 206440 FLUORANTHENE 1.28E+00

EU038 ROOF VENT 30300107 86737 FLUORENE 6.87E-02

EU038 ROOF VENT 30300107 193395 INDENO(1,2,3-CD)PYRENE 6.87E-02

EU038 ROOF VENT 30300107 91576 2-METHYLNAPHTHALENE 8.83E-03

EU038 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E-03

EU038 ROOF VENT 30300107 198550 PERYLENE 3.39E-02

EU038 ROOF VENT 30300107 85018 PHENANTHRENE 1.32E+00

EU038 ROOF VENT 30300107 129000 PYRENE 9.32E-01

EU015 & 

EU016 PASTE PLANT 30300199 83329 ACENAPHTHENE 2.96E-03

EU015 & 

EU016 PASTE PLANT 30300199 208968 ACENAPHTHYLENE 3.19E-05

EU015 & 

EU016 PASTE PLANT 30300199 120127 ANTHRACENE 8.68E-04

EU015 & 

EU016 PASTE PLANT 30300199 56553 BENZO(A)ANTHRACENE 9.24E-05

EU015 & 

EU016 PASTE PLANT 30300199 50328 BENZO(A)PYRENE 5.73E-05

EU015 & 

EU016 PASTE PLANT 30300199 205992 BENZO(B)FLUORANTHENE 8.68E-05

EU015 & 

EU016 PASTE PLANT 30300199 192972 BENZO(E)PYRENE 4.71E-05

EU015 & 

EU016 PASTE PLANT 30300199 191242 BENZO(G,H,I)PERYLENE 2.73E-05

EU015 & 

EU016 PASTE PLANT 30300199 207089 BENZO(K)FLUORANTHENE 5.45E-05

EU015 & 

EU016 PASTE PLANT 30300199 91587 2-CHLORONAPHTHALENE 5.54E-05

EU015 & 

EU016 PASTE PLANT 30300199 218019 CHRYSENE 1.48E-04

EU015 & 

EU016 PASTE PLANT 30300199 53703 DIBENZO(A,H)ANTHRACENE 3.19E-05

EU015 & 

EU016 PASTE PLANT 30300199 206440 FLUORANTHENE 4.71E-03
11

Attachment 1: Emissions Estimates Provided by EPA for the Primary Aluminum Smelter 

UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy)

EU015 & 

EU016 PASTE PLANT 30300199 86737 FLUORENE 1.11E-03

EU015 & 

EU016 PASTE PLANT 30300199 193395 INDENO(1,2,3-CD)PYRENE 2.45E-05

EU015 & 

EU016 PASTE PLANT 30300199 91576 2-METHYLNAPHTHALENE 1.76E-04

EU015 & 

EU016 PASTE PLANT 30300199 91203 NAPHTHALENE 6.37E-04

EU015 & 

EU016 PASTE PLANT 30300199 198550 PERYLENE 3.19E-05

EU015 & 

EU016 PASTE PLANT 30300199 85018 PHENANTHRENE 1.02E-02

EU015 & 

EU016 PASTE PLANT 30300199 129000 PYRENE 2.96E-03

Attachment 2

Comparison of BLP Air Concentration Estimates for Primary Aluminum Smelting

With and Without the Use of Terrain

1

Attachment 2. Comparison of BLP Air Concentration Estimates for Primary Aluminum Smelting With and Without the Use of Terrain

Receptor BLP Output Air Concentration (ug/m3) with Terrain Use BLP Output Air Concentration (ug/m3) without Terrain Use

#

POM 

72002

POM 

75002

POM 

76002

POM 

77002 Naphthalene

POM 

72002

POM 

75002

POM 

76002

POM 

77002 Naphthalene

1 0.0807 0.0135 0.0027 0.0078 0.0001 0.0621 0.0104 0.002 0 0

2 0.0504 0.0085 0.0017 0.0049 0.0001 0.0697 0.0117 0.0023 0.0067 0.0001

3 0.0653 0.0109 0.0022 0.0063 0.0001 0.1087 0.0182 0.0036 0.0105 0.0002

4 0.1158 0.0194 0.0038 0.0112 0.0002 0.1529 0.0256 0.005 0.0148 0.0002

5 0.4383 0.0735 0.0144 0.0423 0.0006 0.4383 0.0735 0.0144 0.0423 0.0006

6 0.0853 0.0143 0.0028 0.0082 0.0001 0.1951 0.0327 0.0064 0.0188 0.0003

7 0.0528 0.0088 0.0017 0.0051 0.0001 0.082 0.0137 0.0027 0.0079 0.0001

8 0.0531 0.0089 0.0017 0.0051 0.0001 0.0783 0.0131 0.0026 0.0076 0.0001

9 0.0521 0.0087 0.0017 0.005 0.0001 0.0746 0.0125 0.0025 0.0072 0.0001

10 0.0488 0.0082 0.0016 0.0047 0.0001 0.0683 0.0114 0.0022 0.0066 0.0001

11 0.0711 0.0119 0.0023 0.0069 0.0001 0.1155 0.0194 0.0038 0.0112 0.0002

12 0.062 0.0104 0.002 0.006 0.0001 0.0984 0.0165 0.0032 0.0095 0.0001

13 0.0563 0.0094 0.0019 0.0054 0.0001 0.0894 0.015 0.0029 0.0086 0.0001

14 0.0526 0.0088 0.0017 0.0051 0.0001 0.0828 0.0139 0.0027 0.008 0.0001

15 0.0516 0.0087 0.0017 0.005 0.0001 0.0788 0.0132 0.0026 0.0076 0.0001

16 0.0496 0.0083 0.0016 0.0048 0.0001 0.0748 0.0125 0.0025 0.0072 0.0001

17 0.0508 0.0085 0.0017 0.0049 0.0001 0.077 0.0129 0.0025 0.0074 0.0001

18 0.0535 0.009 0.0018 0.0052 0.0001 0.0821 0.0138 0.0027 0.0079 0.0001

19 0.0844 0.0141 0.0028 0.0081 0.0001 0.1625 0.0272 0.0053 0.0157 0.0002

20 0.0568 0.0095 0.0019 0.0055 0.0001 0.0864 0.0145 0.0028 0.0083 0.0001

21 0.0603 0.0101 0.002 0.0058 0.0001 0.0957 0.016 0.0031 0.0092 0.0001

22 0.0517 0.0087 0.0017 0.005 0.0001 0.1152 0.0193 0.0038 0.0111 0.0002

23 0.0468 0.0078 0.0015 0.0045 0.0001 0.0762 0.0128 0.0025 0.0074 0.0001

24 0.0271 0.0045 0.0009 0.0026 0 0.038 0.0064 0.0012 0.0037 0.0001

25 0.0363 0.0061 0.0012 0.0035 0.0001 0.0502 0.0084 0.0017 0.0048 0.0001

26 0.0351 0.0059 0.0012 0.0034 0.0001 0.0498 0.0083 0.0016 0.0048 0.0001

27 0.1524 0.0255 0.005 0.0147 0.0002 0.114 0.0191 0.0038 0.011 0.0002

28 0.1532 0.0257 0.005 0.0148 0.0002 0.1234 0.0207 0.0041 0.0119 0.0002

29 0.0431 0.0072 0.0014 0.0041 0.0001 0.0472 0.0079 0.0016 0.0045 0.0001

30 0.0437 0.0073 0.0014 0.0042 0.0001 0.042 0.007 0.0014 0.0041 0.0001
2

Attachment 2. Comparison of BLP Air Concentration Estimates for Primary Aluminum Smelting With and Without the Use of Terrain

Receptor Air Concentration Estimates with Terrain Minus Air Concentration Estimates without Terrain 

# POM 72002 POM 75002 POM 76002 POM 77002 Naphthalene

1 0.0186 0.0031 0.0007 0.0078 0.0001

2 -0.0193 -0.0032 -0.0006 -0.0018 0

3 -0.0434 -0.0073 -0.0014 -0.0042 -0.0001

4 -0.0371 -0.0062 -0.0012 -0.0036 0

5 0 0 0 0 0

6 -0.1098 -0.0184 -0.0036 -0.0106 -0.0002

7 -0.0292 -0.0049 -0.001 -0.0028 0

8 -0.0252 -0.0042 -0.0009 -0.0025 0

9 -0.0225 -0.0038 -0.0008 -0.0022 0

10 -0.0195 -0.0032 -0.0006 -0.0019 0

11 -0.0444 -0.0075 -0.0015 -0.0043 -0.0001

12 -0.0364 -0.0061 -0.0012 -0.0035 0

13 -0.0331 -0.0056 -0.001 -0.0032 0

14 -0.0302 -0.0051 -0.001 -0.0029 0

15 -0.0272 -0.0045 -0.0009 -0.0026 0

16 -0.0252 -0.0042 -0.0009 -0.0024 0

17 -0.0262 -0.0044 -0.0008 -0.0025 0

18 -0.0286 -0.0048 -0.0009 -0.0027 0

19 -0.0781 -0.0131 -0.0025 -0.0076 -0.0001

20 -0.0296 -0.005 -0.0009 -0.0028 0

21 -0.0354 -0.0059 -0.0011 -0.0034 0

22 -0.0635 -0.0106 -0.0021 -0.0061 -0.0001

23 -0.0294 -0.005 -0.001 -0.0029 0

24 -0.0109 -0.0019 -0.0003 -0.0011 -0.0001

25 -0.0139 -0.0023 -0.0005 -0.0013 0

26 -0.0147 -0.0024 -0.0004 -0.0014 0

27 0.0384 0.0064 0.0012 0.0037 0

28 0.0298 0.005 0.0009 0.0029 0

29 -0.0041 -0.0007 -0.0002 -0.0004 0

30 0.0017 0.0003 0 0.0001 0
3