# E **C** 

# / **R Incorporated Providing Environmental Technical Support Since 1989** 

501 Eastowne Drive, Suite 250  Chapel Hill, North Carolina 27514 Telephone: (919)484 -0222  F ax: (919) 484 -0122 

### MEMORANDUM **Date:** September 2 7 , 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 M eteorological S ociety (AMS) and EPA Regulatory

Model (AERMOD) contained within the Human Exposure Model version 3 (HEM3) . B LP 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 Figure s 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 p aste plant scrubb er, was modeled as 71 feet tall with a diameter o f 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**  **U nit 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 Ro of 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' EU03 2 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)py

rene. 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 group s, 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 Di** **spersion 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

### /s 3



### . BLP is cumbersome to use and must be run separately for each pollutant. HEM3 contains as its dispersion model the EPA’s regulatory model AERMOD 2



### . AERMOD incorporate s 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 web 4 

### . 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 pres ented 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 o f 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/m** **3 ))**  **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**  **Em issions**  **(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. Poin** **t Source Locations**  **, E**  **levations and Release Characteristics**  **Used in**  **BLP and AERMOD**  **Source ID**  **UTM Z one 11** 

**E asting**  **UTM Z one 11** 

**Northing Base** 

**Elevation Stack** 

**Height Temp**  **erature Exit**  **Velocity Stack** 

**Diam eter**  **(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 

### Tab **le 5 .**  **Area Source Locations**  **, E**  **levations and Release Characteristics**  **Used in AERMOD**  **Source ID UTM Z** **one**

**11 Easting UTM Z** **one 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** **, E**  **levations and Release Characteristics**  **Used in**  **BLP**

**Source ID Starting** 

**UTM Z one**  **11 Easting Starting** 

**UTM Z one**  **11 Northing Ending** 

**UTM Z one**  **11 Easting Ending** 

**UTM Z one**  **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 5,3 63,814 712,219 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 R** **eceptor #**  **UTM Z one 11**  **E asting**  **(m )**  **UTM Z one 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 9 22 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 1,7 66 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 1,7 66 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 1,7 66 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** R ural 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 -4 

### excess cancer cases per million of people exposed (see Table 9) . The HQ for naphthalene, the only compound with an RfC, was 0.000 3 5 . 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 -4 

### excess cancer cases per million of people exposed and the HQ for naphthalene was 0.0002 0 . 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 re sults. 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 Easti ng, 5,363,756 m Northing** 

**Model MIR**  **HQ** BLP with Terrain 1.59 x 10 -4 

### 0.0002 0 BLP without Terrain 1.59 x 10 -4 

### 0.0002 0 HEM3 with Terrain 1. 28 x 10 -4 

### 0.0003 5 

### Considering the uncertainties of dispersion modeling and the uncertainties of the data on releas e 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 ye ars 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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- 0 3 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- 0 5 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 30300 103 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 1 29000 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 3 0300103 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 3.05 E- 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 3.0 5E- 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 3.0 5E- 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 3.0 5E- 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 3.0 5E- 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 4.6 8E- 05 EU032 POTLINE SCRUBBER 30300103 191242 BENZO(G,H,I)PERYLENE 4.78E- 05

### 5 **Attachment 1**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 21801 9 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 850 18 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 30300 103 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 1933 95 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 85 018 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 RO OF 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 EU0 34 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 B ENZO(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 30 300107 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 20 8968 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- 0 1 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 EU0 36 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 30 300107 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 21801 9 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 30300 107 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary Aluminum Smelter** UnitID ProcessID SCC PollutantCode Pollutant_Code_Desc Emissions(tpy) EU037 ROOF VENT 30300107 91203 NAPHTHALENE 5.64E- 03 EU037 ROOF VENT 30300107 19 8550 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 30 300107 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 EU0 37 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 53 703 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 8 3329 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**  **: Em** **issions Estimates Provided by EPA for the P** **rimary 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 PLA NT 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 Est** **imates 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 720**  **02 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 0.0 82 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 0.082 8 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 0.0 535 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 0.09 57 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 Sm** **elting 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