## 1 United States Environmental Protection Agency Research Triangle Park, NC 27711

MEMORANDUM

SUBJECT: Emission Standards for Meeting the 90 Percent Requirement Under Section

112(c)(3) and Section 112(k) (3) (B) of the Clean Air Act

FROM: Nathan E. Topham, Environmental Engineer

Metals and Minerals Group, SPPD (D243

- 02)

TO: DOCKET ID: EPA

- HQ

- OAR

- 200 2

- 0 036

DATE: February 18 , 2011

Sections 112(c)(3) and (k)(3)(B) of the Clean Air Act (CAA) require that EPA

promulgate emission standards assuring that area sources representing 90 percent of the area

source emissions of the 30 urban hazardous air pollutants (HAP) 1 

## are subject to emission

standards. This memorandum describes how the Agency is satisfying this obligation under

sections 112(c)(3) and (k)(3)(B) f or all 30 urban HAP. This memorandum documents the

actions that EPA has taken to fulfill this obligation.

In 1999, EPA published an Urban Air Toxics Strategy (UATS) that included a list of 30

urban HAP. In the UATS, EPA explained that it had created a baseline inventory that would be

used for a number of actions identified in the UATS, including using the inventory as a baseline

for determin ing whether EPA has promulgated sufficient standards to meet the 90 percent

requirement under section 112(c)(3) and (k)(3)(B) (hereinafter referred to as the “section 112( k )

baseline inventory”). 2 

## Based on that inventory, 3 

## i n a subsequent notice published November 22,

2002, EPA identified the categories that EPA believed at the time were necessary to meet the

1 

### Sections 112(c)(3) and (k)(3)(B) require that EPA identify 30 HAP that present the greatest threat to public health in the largest number of urban areas. EPA commonly refers to these HAP as “urban HAP”. As discussed above, EPA identified the 30 urban HA P in the Urban Air Toxics Strategy, 64 FR 38706 (July 19, 1999).
2 

### See 64 FR 38706, 38711, n.10. The Section 112(k) baseline inventory is representative of the years 1990

- 1993.
3 

### See Docket ID: EPA

- HQ

- OAR

- 2002

- 0036

- 0057, posted 11/29/2002.

## 2

oblig ation for all 30 urban HAP ( 67 FR 70427)

. This memo discusses updates made to the

section 112(k) baseline inventory since the November 2002 notice and any associated changes to

the source category list.

In addition, Appendix I to this memorandum ident ifies the source categories for meeting

the 90 percent requirement for each of the 30 urban HAP and the percent of the baseline

inventory each regulated category contributes for each urban HAP. Appendix II lists all of these

standards alphabetically by ca tegory and, for each standard, the regulated urban HAP and the

Code of Federal Regulation reference for the standard

.

I. Categories Not Needed to Meet the 90 Percent Requirement

A. Brick and Structural Clay Products Manufacturing

At the time of the 2002 notice, t he 112( k ) baseline emissions inventory combined the

baseline emissions from the following two area source categories into the “clay products

manufacturing” category : (1) Brick and Structural Clay Products Manufacturing and (2) Clay

Ceramics Manuf

acturing. Based on the combined baseline emissions estimates for these two

area source categories, EPA determined that both categories were needed to meet the 90 percent

requirement under section 112(c)(3) and 112(k)(3)(B) for chromium, lead, manganese, a nd

nickel.

A more detailed assessment of the estimated baseline emissions shows these baseline

emissions to be from the glazing processes during clay ceramics manufacturing. In light of the

above and b ased on our knowledge of the Brick and Structural Clay Products Man ufacturing area

source category , we believe that only trace amounts of these urban HAP are emitted from the

Brick and Structural Clay Products Manufacturing area source category. As shown in Appendix

I, based on the updated section 112( k ) bas eline inventory, we have determined that we only need

## 3

the clay ceramics manufacturing source category to meet the 90 percent requirement for

chromium, lead, manganese, and nickel. On December 26, 2007 EPA established emission

standards that address these urban HAP emissions from the Clay Ceramic Manufacturing area

source category (72 FR 73180).

B. Other Solid Waste Incineration (Human/Animal Cremation)

At the time of the 2002 notice , the section 112(k) baseline inventory included a mercury

emission estimate of about 1.2 tons of mercury from animal cremation and 0.6 tons for human

cremation 4



## . We believe that baseline mercury emission estimate for animal cremation was

inaccurate because mercury emissions from cremation are due to mercury use in human dental

r estoration and, therefore, there are no mercury emissions from animal cremation

. The table

below shows the updated section 112(k) baseline mercury emissions for this source category

,

which has no mercury emissions from animal cremation and low mercury emi ssions from human

cremation (0.6 tpy). As shown in Appendix I, we have determined that we do not need this

source category to meet the 90 percent requirement under sections 112(c)(3) and (k)(3)(B).

animal cremation human cremation

TPY % TPY % 7

- PAH 0.0000000306 0.0000023 0.0000000119 0.0000009 Arsenic Compounds 0.0118 0.073 0.00459 0.028 Beryllium Compounds 0.000545 0.0005 0.000211 0.019 Cadmium Compounds 0.00438 0.014 0.0017 0.01 Chromium Compounds 0.0118 0.0036 0.00458 0.0014 Formaldehyde 0.0000000858 0.000000000850 0.0000000332 0.000000000330 Mercury Compounds 0 0 0.6 0.994

4 

### See Docket I D: EPA

- HQ

- OAR

- 2002

- 0036

- 0057.

## 4

Nickel Compounds 0.0151 0.0059 0.00585 0.0023

C. Area Source Boilers Fired by Natural Gas (part of the Industrial Boilers and

Institutional/Commercial boilers area source categories)

The Industrial Boilers and Institutional/Commercial Boilers area source categories emit

the following urban HAP: polycyclic organic matter (POM), acetaldehyde, acrolein, arsenic,

beryllium, cadmium, chromium, dioxins, formaldehyde, lead , manganese, mercury, nickel, and

polychlorinated biphenyls (PCB). According to the 112(k) baseline inventory (see table below)

, natural gas

- fired area source boilers emit only acetaldehyde, benzene, and formaldehy de at very

low levels

. There are over 1 million of these natural gas

- fired area source boilers (e.g., boilers

used in churches and schools). We estimate that the cost of controlling the very small amounts of

HAP emissions from natural gas

- fired area source boilers would be over 2 billion dollars

. As

shown in Appendix I, we do not need this group of boilers to meet the 90 percent requirement for

section 112(c)(3) and 112(k)(3)(B).

Industrial Natural Gas

- Fired Area Source Boilers Institutional/Commercial Natural Gas

Fired Area Source Boilers Urb an HAP Emissions (tons

per year) Percent

Contribution Emissions (tons

per year) Percent

Contribution Acetaldehyde 0.0136 0.001% 0.0174 0.0002% Benzene 2.2 0.003% 2.81 0.0003% Formaldehyde 78.7 0.008% 100 0.01%



## II. Updates to Baseline Emission Inventory for Mercury

The baseline emission inventory contained inaccurate mercury emissions for electric arc

furnaces. Mercury emissions from EAF during 1990 w ere evaluated during the development of

the EAF area source rule pursuant to section 112(c)(3) and (k)(3)(B) of the CAA. Based on

## 5

scrap steel charged in EAFs during 1990 (38 million tons) and a revised emission factor 5 

## from

scrap steel, the 1990 base

- year mercury emissions from this area source category were estimated

to be 7.8 tons. The inventory in Appendix I has been updated to reflect this change as well as the

change to human/animal cremation mentioned above

.

5 

### Prepared for U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Sector Policies and Program Division, Metals and Minerals Grou p. July 18, 2007. Docket Item 0070 in EPA Docket Number OAR

- 2004

- 0083.

## 6 Appe ndix I

– Source Categories for Meeting the 90 Percent Requirement U nder CAA Sections 112(c)(3) and 112(k)(3)(B)

Table I.1

– Percent Contributions to 90 Percent Requirement from Regulated Area Source Categories 6

6 

### “Full table including “Other” categories will available along with this memo in Docket ID EPA

- HQ

- OAR

- 2002

- 0036.

## 7

## 8

## 9

Appendix II

– Area Source Categories Used for Meeting the 90 Percent Requirement Under

CAA Section s 112(c)(3) and 112(k)(3)(B)

Table II.1

– Source Categories, Urban HAP, and CFR Subparts Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Acrylic/Modacrylic Fibers Production Acrylonitrile 40 CFR part 63 subpart LLLLLL Agricultural Chemicals and Pesticide Manufacturing 1,3

- Dichloropropene, Arsenic Compounds, Chromium Compounds, Hexachlorobenzene, Hydrazine, Lead Compounds, Manganese Compounds 40 CFR part 63 subpart VVVVVV

Aluminum Foundries Beryllium Compounds, Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart ZZZZZZ

Asphalt Processing & Asphalt Roofing Manufacturing Chromium Compounds, Polycyclic Organic Matter 40 CFR part 63 subpart AAAAAAA

Carbon Black Production Polycyclic Organic Matter 40 CFR part 63 subpart MMMMMM Chemical Preparations Industry Cadmium Compounds, Chromium Compounds, Ethylene Dichloride, Ethylene Oxide, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart BBBBBBB

Chromic Acid Anodizing, Decorative Chromium Electroplating, Hard Chromium Electroplating Chromium Compounds 40 CFR part 63 subpart N

Chemical Manufacturing: Chromium Compounds Chromium Compounds 40 CFR part 63 subpart NNNNNN Clay Ceramics Manufacturing Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart RRRRRR

Commercial Sterilization Facilities Ethylene Oxide 40 CFR part 63 subpart O Copper Foundries Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart ZZZZZZ

## 10

Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Cyclic Crude & Intermediate Production Acetaldehyde, Cadmium Compounds, Chloroform, Chromium Compounds, Ethylene Dichloride, Hydrazine, Lead Compounds, Manganese Compounds, Methylene Chloride, Nickel Compounds, Quinoline 40 CFR part 63 subpart VVVVVV

Dry Cleaning Facilities Tetrachloroethylene 40 CFR part 63 subpart M Ferroalloys Production Chromium Compounds, Manganese Compounds, Polycyclic Organic Matter, Nickel Compounds 40 CFR part 63 subpart YYYYYY

Flexible Polyurethane Foam Fabrication and Production Methylene Chloride 40 CFR part 63 subpart OOOOOO
Gasoline Distribution Bulk Terminal, Bulk Plant and Pipeline Facilities Benzene, Ethylene Dichloride, Lead Compounds 40 CFR part 63 subpart BBBBBB

Halogenated Solvent Cleaners / Degreasing Organic Cleaners Methylene Chloride, Tetrachloroethylene, Trichloroethylene 40 CFR part 63 subpart T

Hazardous Waste Incineration Arsenic Compounds, Beryllium Compounds, Cadmium Compounds, Chromium Compounds, Dioxins, Lead Compounds, Mercury Compounds, Polychlorinated Bip henyls 40 CFR part 63 subpart EEE

Industrial Boilers fired by coal, wood, and oil Acetaldehyde, Acrolein, Arsenic Compounds, Benzene, Beryllium Compounds, Cadmium Compounds, Chromium Compounds, Dioxins, Ethylene Dichloride, Formaldehyde, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel, Polychlorinated Biphenyls, Polycyclic Organic Matter 40 CFR part 63 subpart JJJJJJ

## 11

Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Industrial Inorganic Chemical Manufacturing 1,3

- Dichloropropene, Acetaldehyde, Arsenic Compounds, Cadmium Compounds, Chloroform, Chromium Compounds, Hydrazine, Lead Compounds, Manganese Compounds, Mercury Compounds, Methylene Chloride, Nickel Compounds 40 CFR part 63 subpart VVVVVV

Industrial Organic Chemical Manufacturing 1,3 Butadiene, Acetaldehyde, Arsenic Compounds, Cadmium Compounds, Chloroform, Chromium Compounds, Ethylene Dichloride, Hydrazine, Lead Compounds, Manganese Compounds, Mercury Compounds, Methylene Chloride, Nickel Compounds 4 0 CFR part 63 subpart VVVVVV

Inorganic Pigments Manufacturing Chromium Compounds, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel Compounds 40 CFR part 63 subpart VVVVVV

Institutional/Commercial Boilers fired by coal, wood, and oil Acetaldehyde, Acrolein, Arsenic Compounds, Benzene, Beryllium Compounds, Cadmium Compounds, Chromium Compounds, Dioxins, Ethylene Dichloride, Formaldehyde, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel Compounds, Polycyclic Organic Matter 40 CFR part 63 subpart JJJJJJ

Iron and Steel Foundries Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart ZZZZZ

Lead Acid Battery Manufacturing Cadmium Compounds, Lead Compounds, Nickel Compounds 40 CFR part 63 subpart PPPPPP
Medical Waste Incinerators Arsenic Compounds, Cadmium Compounds, Chromium Compounds, Dioxins, Formaldehyde, Lead Compounds, Manganese Compounds, Mercury 40 CFR 60 subpart Ec & 40 CFR part 62 subpart HHH

## 12

Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Compounds, Nickel Compounds

Mercury Cell Chlor

- Alkali Plants Mercury Compounds 40 CFR part 63 subpart IIIII
Metal Fabrication and Finishing: Electrical and Electronic Equipment Manufacturing Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds, Trichloroethylene 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Fabricated Metal Products Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds, Trichloroethylene 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Fabricated Plate Work (Boiler Shops) Chromium Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Fabricated Structural Metal Manufacturing Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Heating Equipment, Except Electric Chromium Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Industrial Machinery and Equipment Manufacturing Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Iron and Steel Forging Chromium Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Primary Metal Products Manufacturing Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds, Trichloroethylene 40 CFR part 63 subpart XXXXXX

Metal Fabrication and Finishing: Valves & Pipe Fittings Cadmium Compounds, Chromium Compounds, Lead Compounds, Nickel Compounds, Trichloroethylene 40 CFR part 63 subpart XXXXXX

## 13

Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Misc Organic Chemical Manufacturing 1,3 Butadiene, 1,3

- Dichloropropane, Acetaldehyde, Beryllium Compounds, Cadmium Compounds, Chloroform, Chromium Compounds, Ethylene Dichloride, Hydrazine, Lead Compounds, Manganese Compounds, Mercury Compounds, Methylene Chloride, Nickel Compo unds, Quinoline 40 CFR part 63 subpart VVVVVV

Municipal Landfills 1,1,2,2

- Tetrachloroethane, 1,2

- Dichloropropane, Acrylonitrile, Benzene, Chloroform, Ethylene Dichloride, Methylene Chloride, Polychlorinated biphenyls, Polycyclic Organic Matter, Tetrachloroethylene, Trichloroethylene, Vinyl Chloride 40 CFR part 63 subpart AAAA

Hospital Ethylene Oxide Sterilizers Ethylene Oxide 40 CFR part 63 subpart WWWWW

Nonferrous Foundries Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart ZZZZZZ

Oil & Natural Gas Production Benzene 40 CFR part 63 subpart HH
Paint and Allied Products Manufacture Benzene, Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Mercury Compounds, Methylene Chloride, Nickel Compounds 40 CFR part 63 subpart CCCCCCC

Paint Stripping Operations, Misc. Surface Coating, Autobody Refinishing Cadmium Compounds, Chloroform, Chromium Compounds, Lead Compounds, Manganese, Methylene Chloride, Nickel Compounds, Trichloroethylene 40 CFR part 63 subpart HHHHHH

## 14

Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Pharmaceutical Production Arsenic Compounds, Chloroform, Ethylene Dichloride, Manganese Compounds, Methylene Chloride, Nickel Compounds 40 CFR part 63 subpart VVVVVV

Plastic Materials and Resins Manufacturing 1,3 Butadiene, Acetaldehyde, Ethylene Dichloride, Hydrazine, Lead Compounds, Methylene Chloride 40 CFR part 63 subpart VVVVVV

Plating and Polishing Arsenic Compounds, Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds, Trichloroethylene 40 CFR part 63 subpart WWWWWW

Portland Cement Arsenic Compounds, Beryllium Compounds, Cadmium Compounds, Chromium Compounds, Dioxins, Lead Compounds, Mercury Compounds, Polychlorinated Biphenyls 40 CFR part 63 subpart LLL

Prepared Feeds Arsenic Compounds, Chromium Compounds, Manganese Compounds 40 CFR part 63 subpart DDDDDDD

Pressed & Blown Glass Manufacturing. Arsenic Compounds, Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart SSSSSS

Primary Copper Smelting Arsenic Compounds, Cadmium Compounds, Chromium Compounds, Lead Compounds, Nickel Compounds 40 CFR part 63 subpart EEEEEE

Primary Nonferrous Metal Arsenic Compounds, Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Nickel Compounds 40 CFR part 63 subpart GGGGGG

## 15

Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Publicly Owned Treatment Works 1,1,2,2

- Tetrachloroethane, 1,2

- Dichloropropane, 1,3 Butadiene, Acetaldehyde, Acrolein, Acr ylonitrile, Benzene, Chloroform, Ethylene Oxide, Formaldehyde, Methylene Chloride, Tetrachloroethylene, Trichloroethylene, Vinyl Chloride 40 CFR part 63 subpart VVV

PVC & Copolymer Production Vinyl Chloride 40 CFR part 63 subpart DDDDDD Reciprocating Internal Combustion Engines (RICE)

- Existing Compression Ignition, Existing Spark Ignition Acetaldehyde, Arsenic Compounds, Benzene, Beryllium Compounds, Cadmium Compounds, Chromium Compounds, Formaldehyde, Lead Compounds, Manganese Compounds, Mercury Com pounds, Polycyclic Organic Matter 40 CFR part 63 subpart ZZZZ

Secondary Copper Smelting Cadmium Compounds, Dioxins, Lead Compounds 40 CFR part 63 subpart FFFFFF Secondary Lead Smelting 1,1,2,2

- Tetrachloroethane, 1,3 Butadiene, 1,3

- Dichloropropane, Acetaldehyde, Acrolein, Arsenic, Benzene, Cadmium Compounds, Chloroform, Chromium Compounds, Dioxins, Formaldehyde, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel Compounds, P olycyclic Organic Matter 40 CFR part 63 subpart X

Secondary Non

- Ferrous Metals Arsenic Compounds, Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel Compounds 40 CFR part 63 subpart TTTTTT

Sewage Sludge Incineration 1,1,2,2

- Tetrachloroethane, Acrylonitrile, Cadmium, Chromium, Dioxins, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel Compounds, Polychlorinated Biphenyls, 40 CFR part 60 subpart MMMM

## 16

Section 112(k) Source Category Name Urban HAP Code of Federal Regulations Part and Subpart Polycyclic Organic Matter

Small Municipal Waste Combustors Arsenic Compounds, Cadmium Compounds, Chromium Compounds, Dioxins, Formaldehyde, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel Compounds 40 CFR part 60 subpart AAAA & 40 CFR part 62 subpart JJJ

Stainless and Non

- stainless Steel Manufacturing (EAFs) Arsenic Compounds, Beryllium Compounds, Cadmium Compounds, Chromium Compounds, Lead Compounds, Manganese Compounds, Mercury Compounds, Nickel Compounds, Trichloroethylene 40 CFR part 63 subpart YYYYY

Synthetic Rubber Manufacturing 1,3 Butadiene 40 CFR part 63 subpart VVVVVV Wood Preserving Arsenic Compounds, Chromium Compounds, Dioxins, Methylene Chloride 40 CFR part 63 subpart QQQQQQ

Among the 30 urban HAP selected to fulfill the section 112(k) mandate, dioxins, POM,

and PCBs are actually groups of multiple compounds of similar structure. For the purposes of the

112(k) inventory, dioxins are represented by toxicity equivalents while PO M is represented by a

group of seven specific compounds included in the definition of POM that act as a surrogate.

These “7

- PAH” compounds 7 

## are classified as probable human carcinogens and were used for

determining that POM was one of the 30 pollutants tha t posed the highest risks for urban areas.

Additionally, 7

- PAH had a robust emissions inventory for urban area sources for the purposes of

section 112(k). A more detailed discussion on the selection of the 30 urban HAP and how they

7 

### The 7

- PAH compounds are: benz(a)anthracene, benzo(a)pyrene, benzo (b)fluoranthene, benzo(k)fluoranthene, chrysene, dibenz(a,h)anthracene, and indeno(1,2,3

- cd)pyrene

## 17

are inventoried for the purpose of section 112(k) can be found on the EPA’s Technology

Transfer Network Area Source Standards webpage at

<http://www.epa.gov/ttn/atw/area/arearules.html>. Table II.2 lists the 30 urban HAP, the

percent subject to regulation, and the Code of Federa l Regulation parts and subparts used to

reach the regulated percentage.

Table II.2

– Regulated Percentages of 30 Urban HAP

Urban HAP Percent Subject to Regulation Code of Federal Regulations Part and

Subpart
1,1,2,2

- Tetrachloroethane 100.0% 40 CFR part 63 subparts X, VVV, AAAA, MMMM 1,2

- Dichloropropane 95.0% 41 CFR part 63 subparts VVV, AAAA

1,3 Butadiene 96.6% 40 CFR part 63 subparts X, VVV, VVVVVV 1,3

- Dichloropropene 99.5% 40 CFR part 63 subparts X, VVVVVV

Acetaldehyde 92.5% 40 CFR part 63 subparts X, VVV, ZZZZ, JJJJJJ, VVVVVV

Acrolein 99.2% 40 CFR part 63 subparts X, VVV, JJJJJJ

Acrylonitrile 95.9% 40 CFR part 63 subparts VVV, AAAA, MMMM, LLLLLL Arsenic Compounds 99.7% 40 CFR part 63 subparts X, EEE, LLL ZZZZ, YYYYY, EEEEEE, GGGGGG, JJJJJJ, QQQQQQ, SSSSSS, TTTTTT, VVVVVV, WWWWWW, DDDDDDD ; 40 CFR part 60 subpart MMMM ; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, AAAA Benzene 93.7% 40 CFR part 63 subparts X, VVV, AAAA, ZZZZ, BBBBBB, HHHHHH, JJJJJJ, CCCCCCC

Beryllium Compounds 100.0% 40 CFR part 63 subparts EEE, LLL, ZZZZ, YYYYY, JJJJJJ, VVVVVV, ZZZZZZ

## 18 Urban HAP Percent Subject to Regulation Code of Federal Regulations Part and

Subpart Cadmium Compounds 93.3% 40 CFR part 63 subparts X, EEE, LLL, ZZZZ, YYYYY, ZZZZZ, EEEEEE, FFFFFF, GGGGGG, HHHHHH, JJJJJJ, PPPPPP, SSSSSS, TTTTTT, VVVVVV, WWWWWW, XXXXXX, ZZZZZZ, BBBBBBB, CCCCCCC ; 40 CFR part 60 subpart MMMM; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, AAAA Chloroform 93.5% 40 CFR part 63 subparts X, VVV, AAAA, HHHHHH, VVVVVV Chromium Compounds 90.1% 40 CFR part 63 subparts N, X, EEE, LLL, YYYYY, ZZZZZ, EEEEEE, GGGGGG, HHHHHH, JJJJJJ, QQQQQQ, SSSSSS, TTTTTT, VVVVVV, WWWWWW, XXXXXX, YYYYYY, ZZZZZZ, AAAAAAA, BBBBBBB, CCCCCCC, DDDDDDD; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, MMMM, A AAA Dioxins (2,3,7,8

- TCDD) 99.6% 40 CFR part 63 subparts X, EEE, LLL, FFFFFF, JJJJJJ ; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, MMMM, AAAA

Ethylene Dichloride 93.2% 40 CFR part 63 subparts AAAA, BBBBBB, JJJJJJ, VVVVVV, BBBBBBB Ethylene Oxide 93.5% 40 CFR part 63 subparts O, VVV, WWWWW, BBBBBBB Formaldehyde 95.0% 40 CFR part 63 subparts X, HHH, VVV, ZZZZ, JJJJJJ, 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, AAAA
Hexachlorobenzene 98.7% 40 CFR part 63 subpart VVVVVV Hydrazine 97.4% 40 CFR part 63 subpart VVVVVV

## 19 Urban HAP Percent Subject to Regulation Code of Federal Regulations Part and

Subpart Lead Compounds 90.3% 40 CFR part 63 subparts X, EEE, LLL, ZZZZ, YYYYY, BBBBBB, EEEEEE, FFFFFF, GGGGGG, HHHHHH, PPPPPP, RRRRRR, SSSSSS, TTTTTT, VVVVVV, WWWWWW, XXXXXX, ZZZZZZ, BBBBBBB, CCCCCCC, JJJJJJ; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, AAAA Manganese Compounds 90.0% 40 CFR part 63 subparts X, ZZZZ, YYYYY, GGGGGG, HHHHHH, JJJJJJ, RRRRRR, SSSSSS, TTTTTT, VVVVVV, WWWWWW, XXXXXX, ZZZZZZ, AAAAAAA, BBBBBBB, CCCCCCC, DDDDDDD ; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, MMMM, AAAA Mercury Compounds 92.1% 40 CFR part 63 subparts X, EEE, LLL, ZZZZ, IIIII, YYYYY, JJJJJJ, TTTTTT, VVVVVV, AAAAAAA, CCCCCCC; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, MMMM, AAAA Methylene Chloride 92.5% 40 CFR part 63 subparts T, VVV, AAAA, HHHHHH, OOOOOO, QQQQQQ, VVVVVV, CCCCCCC Nickel Compounds 90.0% 40 CFR part 63 subparts X, YYYYY, ZZZZZ, EEEEEE, HHHHHH, PPPPPP, RRRRRR, SSSSSS, TTTTTT, VVVVVV, WWWWWW, XXXXXX, ZZZZZZ, BBBBBBB, CCCCCCC, JJJJJJ; 40 CFR part 62 subparts HHH, JJJ; 40 CFR part 60 subparts Ec, MMMM, AAAA Polychlorinated biphenyls 91.0% 40 CFR part 63 subparts EEE, LLL, AAAA, JJJJJJ; 40 CFR part 60 subpart MMMM Polycyclic Organic Matter 93.1% 40 CFR part 63 subparts X, AAAA, ZZZZ, AAAAAA, JJJJJJ, MMMMMM, YYYYYY ; 40 CFR part 60 subpart MMMM Quinoline 100.0% 40 CFR part 63 subpart VVVVVV

## 20 Urban HAP Percent Subject to Regulation Code of Federal Regulations Part and

Subpart Tetrachloroethylene 99.0% 40 CFR part 63 subparts M, T, VVV, AAAA Trichloroethylene 90.9% 40 CFR part 63 subparts T, VVV, AAAA, YYYYY, HHHHHH, WWWWWW, XXXXXX Vinyl Chloride 94.7% 40 CFR part 63 subparts VVV, AAAA, DDDDDDSource Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Adhesives and Sealants 0.02 0 0.01 0 0.22 0 0.02 Aerospace Industries 0 0.1 0 0.22 0.07 0.03 0 0 3.67 0.48 0.12 4.25 Agricultural Chemicals and Pesticides 0 0 0.09 0.01 0 0.01 Air and Gas Compressors 0.08 Aluminum Die-Castings 0 0 0.05 0.02 0.01 0.05 Aluminum Extruded Products 0.12 0 0.09 0.02 0.16 0.01 Aluminum Foundries 0.04 0.01 Aluminum Sheet, Plate, and Foil manufacturing 0.06

Ammunition, Except for Small Arms 0.06 0.01 Analytical Instruments 0.01 Animal Cremation 0 0.07 0.05 0.01 0 Apparel and Accessories, nec 0.2 0.01 Asbestos Products Manufacturing 0.04 Asphalt Concrete Manufacturing 6.96 0.01 0 0.11 Asphalt Roofing Manufacturing 0 0 Automotive Services, Nec 0.04 Automotive stampings 0.78 0.16 0.11 0.12 0.03 0.35 0 0.05 Aviation Gasoline Distribution: Stage I & II 0.03 Bags, Except Textile Bags 0 Ball and Roller Bearings Manufacturing 0.13 0.09 0.11 0 Beet Sugar 0 Biological Products, Except Diagnostic 0 Blowers and Fans 0.05 0.08 0.04 0.1 Boat Manufacturing 0 0 0.13 0 Bolts, Nuts, Rivets and Washers Manufacturing 0 0.01 0 0 0 0.02 Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions

Page 1 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Bottled and Canned Soft Drinks 0 Brass, Bronze, Copper, Copper Base Alloy Foundries 0.61 0.12 0.35 Brooms and Brushes 0.08 0 0 Burial Caskets 0.04 Business Services, nec (7399) 0 Canned Fruits and Vegetables 0 Carbon and Graphite Products 0.03 Carbon Black Production 0.14 0.23 Carbon Reactivation Furnaces 0.02 Carburetors, Pistons, Rings and Valves Manufacturing 0 0.08 0.11 0.08 0.2 0.06 Cathode Ray Television Picture Tubes Manufacturing 0.06 0.09 0.03 0.05 0.07 Cement, Hydraulic (not subject to Portland Cement MACT) 0 0 0.02 0.11 0.05 0 0 0 0 0 0 Chemical Manufacturing: Alkalies and Chloride (not subject to Chlorine 0 Chemical Manufacturing: Phenol 0.01 Chemical Preparations 0 1 0.01 0.01 0.14 1.32 0.05 0.01 0.01 Chemicals and Allied Products Manufacturing 0.01 0.02 0 0 0 0 0

Chemicals and Allied Products, nec 0 0 0.09 0 0.02 0 0.01 Clay Products Manufacturing 0 0 Clay Refractories (not subject to Refractories Manufacturing MACT) 0 0.04 Cold Finishing of Steel Shapes 0.16 0.03 0.41 0.18 0.04 Commercial Lighting Fixtures 0.01 Commercial Physical Research 0 0 0 0.01 0 0.01 0 0 Commercial Printing, Letterpress, and Screen 0.39 0.01 Commercial Printing, Lithographic 0.05 0.01 Communications Equipment, nec 0.02 0
Page 2 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Computer Terminals 0.03 Concrete Block and Brick 0.08 Concrete Products 0.04 0.02 Condensed and Evaporated Milk 0 Conveyors and Conveying Equipment Manufacturing 0.15 0.04 0.2 Copper Rolling and Drawing 1.04 0.04 0.37 0.01 0.41 0.01 0.04 Crushed And Broken Limestone 0 Custom Compound Purchased Resins Manufacturing 0.03 0.02 1.11 1.19 0.16 0.05 0.05 Cutlery 0.08 0.04 0.05 Cyclic Crude and Intermediate Production 0.41 0.2 0.06 0.04 Dental Equipment and Supplies 0.05 Dog and Cat Food 0.03 0.01 Drapery Hardware and Blinds and Shades 0 Drum and Barrel Reclamation 0 0.05 0.18 Edible Fats and Oils 0 Electric Lamps 0.08 0.39 1.45 0.03 Electrical Equipment and Supplies,

nec 0.01 Electrical Industrial Apparatus, nec 0 0 0.03 Electromedical Equipment Manufacturing 0.02 Electron Tubes Manufacturing 0 0

Electronic Capacitors Manufacturing 0 0.01 0.11 Electronic Coils and Transformers 0.05 Electronic Components and Accessories 0.04 Electronic Components, nec 0.05 0 0 0.01 0.11 0.01 0.01 0.11 0.01 0.02 0.2

Page 3 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Electronic Connectors 0 0.14 Electronic Resistors 0.05 Elevators and Moving Stairways Manufacturing 0.06 0.03 Engine Electric Equipment 0.06 0.05 Engineering, Laboratory, Scientific and Research 0 0 0 0 Environmental Controls Manufacturing 0.03 0.01 0.06 Fabricated Metal Products Manufacturing 0.27 0.05 Fabricated Metal Products, nec 0.02 0.01 Fabricated Pipe and Fittings 0.04 0.27 0.02 0.05 0.01 0.02 Fabricated Rubber Products, nec 0.07 0 0 0.12 0 0.12 0 0.01 0.13 Fabricated Structural Metal Manufacturing 0.03 0

Fabricated Structural Metal Products 0.01 0.03 0.15 0.06 Fabricated Textile Products, nec 0.05 Farm Machinery and Equipment Manufacturing 0.31 0.08 0 Fasteners, Buttons, Needles, and Pins 0 Fertilizers, Mixing only 0.04 0 1.09 Flat Glass 0 Flavoring Extracts and Syrups Production 0 0.01 Fluid Meters and Counting Devices 0.08 0.01 0 Fluid Power Cylinders and Activators 0 0 0 Fluid Power Pumps and Motors 0.01 0.01 0.02 Fluorescent Lamp Recycling 0.01 Food Preparations Production 0.42 0 0
Page 4 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Food Preparations Production 0 Food Products Machinery 0.04 0.05 Food Products Machinery Manufacturing 0 0 Footwear Cut Stock 0 Friction Products Manufacturing 0.01 0 0.03 Gaskets, Packing and Sealing Devices Manufacturing 0 0 General Industrial Machinery Manufacturing 0.16 0.01 0.08 0.03 0.2 General Laboratory Activities 0.89 Geothermal Power 2.16 Guided Missiles and Space Vehicles Manufacturing 0.51 Gum and Wood Chemical Manufacturing 0.01

Hand and Edge Tools Manufacturing 0 0.09 0 0.04 0.1 0.04 Hardware Manufacturing 0.08 0 0 0.02 0 0.1 0

Heating Equipment, Except Electric 0.03 Heavy Construction, Nec 0.04 0.04 0.05 Highway And Street Construction 0.08 Household Appliances 0.01 Household Audio and Video Equipment 0.06 Household Vacuum Cleaners 0.04 0 Human Cremation 0 0.03 0.02 0.01 0 0.99 Hydrochloric Acid Production 0 0.4 0 0.01 0 0.05 0 0 0.01 0 0.04 0 0.14 0 0 0.05 Industrial Boilers 0 0 0 Industrial Controls 0.02 0.04 Industrial Equipment: Finishing Operations

Page 5 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Industrial Furnaces and Ovens 0.05 0.04 0.05 0.05 Industrial Gases Manufacturing 0.16 Industrial Inorganic Chemical Manufacturing 0 0.03 0.04 0 0 Industrial Machinery, nec 0.04 0.1 0 0.07 Industrial Manufacturing and Equipment: finishing operations 0.07 Industrial Organic Chemical Manufacturing 0 0.78 0.45 1.31 0.28 0 0.02 Industrial Patterns 0 Industrial Patterns Packaging machinery 0 0.01 0 Inorganic Pigments Manufacturing 0 0 Institutional/Commercial Heating 0 0 Instrument Manufacturing 0.83 Instruments to Measure Electricity 0.04 0.07 Internal Combustion Engine Manufacturing 0 0.05 0.05 Iron Foundries 0 0.01 0 Jewelry, Precious Metal 0.03 0.01 0.06 Lamp Breakage 1.67 Large Appliance (Surface Coating) 0 0.39 0.08 0.06 0.2 0.28 0.26 0.01 0.14 Lawn and Garden Equipment 0 0.08 0.05 0.07 Lead Acid Battery Manufacturing 0.1 0 0 0 Lead Pencils, Art Goods Manufacturing 0.03 0.78 0.08 0.06 0.08 0.1 Leather Goods, nec 0 0.01 Leather Tanning and Finishing Operations 0.04 0 0 Lighting Equipment 0 0.06 0.12 0.05 0 Lubricating Oils and Greases 0 0.06 0.01 0 0.08 Luggage 0.03 Machine Tool Accessories 0 0.03 0.1 0.01 0

Page 6 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Machine tools, Metal Cutting Types 0.08 0.09 0.06 0

Machine tools, Metal Forming Types 0.16 0.28 0.01 Magnetic and Optical Recording Media Manufacturing 0.04 Manifold Business Forms 0.04 0.08 0.05 0.01 Manufacturing Industries, nec 0.02 0.1 0 0.08 0.04 0.11 0.11 0.12 Marking Devices 0.01 Measuring and Controlling Devices,

nec 0 0.12 Measuring and Dispensing Pumps 0.01 Meat Packing Plants 0 Men's and Boys' Shirts 0.03 Men's and Boys' Work Clothing 0 Men's Footwear, Except Athletic 0.03 Metal Barrels, Drums, and Pails 0 0 0.11 0 0.03 0 Metal Can (Surface Coating) 0.63 0 Metal coating and allied services 0.24 0 0.04 0.01 0.03 0.16 0.03 0.12 Metal Coil (Surface Coating) 0.03 0 0 0.1 0 0.01 Metal Doors, Sash, and Trim 0.08 0.12 0.02 0.1 0.02 Metal Forgings and Stampings 0.04 0.03 0.04 0.05 0 Metal Furniture (Surface Coating) 0 0 0 0.05 0.35 Metal Heat Treating Manufacturing 0.02 0.04 0.25 0 0.05 0.04 0.12 Metal Sanitary Ware Manufacturing 0.11 0.08 0.16 0.2 Metal Services, nec 0.04 0 0.1 0 Metal Stampings Manufacturing 0.19 0.01 0.08 0.23 0.02 0.5 Metal Valves 0.05 0.04 0.06 0 Metalworking Machinery 0.08 0.04 0.1 0 Metalworking Machinery, nec 0.01 Millwork, Plywood, and Structural Members 0.01

Page 7 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Mineral Wool Manufacturing (not subject to Mineral Wool Production MACT) 0.02 Mining Machinery Manufacturing 0.15 0 0.4 0.01 0.08 0 Miscellaneous Fabricated Metal Products 0.2 0.58 0.26 0.01 0.08 Miscellaneous Fabricated Wire Products 0.2 0 0.03 0.12 0.04 0.3 0.01 0.05 Miscellaneous Metal Work 0.05 0.05 Miscellaneous Plastics Products 0.01 0.1 0.09 0 0.22 0 0 Miscellaneous Publishing 0 MON 0 4.73 0.1 1.08 0.2 0.11 0.11 0 0 0.62 Motor Vehicle Equipment 0 Motors and Generators Manufacturing 0.16 0 0.01 0.02 Natural Gas Transmissions and Storage 3.17 Nitrogenous Fertilizers 0

Nonclay Refractories (not subject to Refractories Manufacturing MACT) 0.24 0.15

Noncurrent-Carrying Wiring Devices 0 0.19 0 0 Nonferrous Die-castings, Except Aluminum 0.08 0.01 0.14 0.08 0.25 0.16 Nonferrous Forgings 0.12 0.03 0 0.25 Nonferrous Foundries, nec 0.01 Nonferrous Rolling and Drawing 0.78 0.08 0.15 0 0.01 0.12 0 Nonferrous Wire Drawing and Insulating 0.02 0.76 0.13 0 0.01 Nonmetallic Mineral Products Manufacturing 0 0 0 0.01 0 0 0 Nutritional Yeast Manufacturing 1.79
Page 8 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Ophthalmic Goods 0.02 0 0.02 Optical Instruments and Lenses 0 Optical instruments and lenses (disc. 1987, 3827) 0.01 Ordnance And Accessories, nec 0.03 Other Source Categories (HCB) 1.3 Other Source Categories (PCB) 0.41 Paint Stripping Operations [3] Paints and Allied Products Manufacturing 0.1 0.02 0 0 Paper And Allied Products 2.37 Paper and Other Webs (Surface Coating) 0.08 0.04 0.08 0.02 0.03 0.05 Paper Coating and Glazing Manufacturing 0.01 0 Paper Industries Machinery 0.19 0.17 0.24 Paper Mills (not subject to Pulp and Paper MACT) 3.34 0.18 Paperboard Mills 0 Particleboard 0 Petroleum Bulk Stations and Terminals (not subject to Petroleum Refining MACT) 0.02 0 0 Petroleum Products, nec 0 Petroleum Refineries: Other Sources Not Distinctly Listed 1.26 Petroleum Refining (not subject to Petroleum Refining MACT) 1.99 0.53 0.05 0.47 0.34 0.07 0 0.26 0 Pharmaceuticals Production 0 0.05 0.1 0.2 0 0.03 Phosphate Fertilizers Production 0.06 0.36 Photographic Equipment And Supplies 0 0.01 0.02 0

Page 9 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Plastic materials and resins manufacturing [6] 1.63 0.11 Plastic Parts and Products (Surface Coating) 0 0.03 0.04 Plastics Materials and Resins Manufacturing 0.14 0 0.04 2.49

Plastics Products Inc. Plastic Bottles 0.05 Platemaking Services 0.02 Plating And Polishing 0.19 0 0.06 0.08 Plumbing And Heating, Except Electric 0.04 0 Plumbing Fixture Fittings and Trim 0.1 0.73 0.08 0 0.22 0 0.04 Plywood/Particle Board Manufacturing 0.01 0 0 0.19 0 0.01 Polishes and Sanitation Goods Manufacturing 0 0 0.16 0.01 0 Polyether Polyols Production 1.6

Polymers and Resins (I,II,and IV) [2] 0.14 Polyvinyl Chloride and Copolymers Production 0 Portland Cement Manufacture (Combined) 0 Potato Chips and Similar Snacks 0

Poultry Slaughtering and Processing 0 Power Driven Handtools 0 Power Transmission Equipment 0 0.01 0.16 0 0.01 Prepared Feeds Manufacturing 0.77 0.23 Pressed and Blown Glass and Glassware Manufacturing 0 0.01 0

Page 10 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Primary Battery, Dry and Wet Manufacture 0 0.03 0.7 0.01 0 Primary Lead Smelting 0.01 Printing Ink 0.16 0.16 0.02 Printing Trades Machinery Manufacturing 0.56 Printing, Coating, and Dyeing of Fabrics 0.44 0.04 0 0 0.12 0 0.01 0.02 Printing/Publishing (Surface Coating) 0.02 0.07 0.1 0 0.05 0.04 Process Control Instruments 0 0 0.1 0.02 0.02 Products of Purchased Glass 0.17 0 Pumps and Pumping Equipment Manufacturing 0.02 0.01

Radio and Television Communications Equipment (3662) 0.11 0.01 0.01 0.07

Radio and Television Communications Equipment (3663) 0 0 0.04 0.01 Railroad Equipment Manufacturing 0.08 0.06 0.66 0.07 Reconstituted Wood Products 0.1 Refractories Manufacturing 0.2 0.02 Refuse Systems 0 0 2.46 0 Reinforced Plastic Composites Production 0.24 0.01 0 0.04 0.02 0.2 0.01 0 Relays and Industrial Controls 0.08 0.05 0.01 Residential lighting fixtures 0.01 Rubber & Misc. Plastic Products 0 Rubber and Plastic Hose and Belting Manufacturing 0.04 0.03 Sanitary Food Containers 0 Saw Blades and Handsaws 0 0 0
Page 11 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Sawmills and Planing Mills, general 0.01 Scrap and Waste Materials 5.49 Screw Machine Products Manufacturing 0.01 0 0.13 0.01 0.01 0.57 Search and Navigation Equipment 0.06 0.04 Secondary Lead Smelting 0.01 0.09 0 0 Secondary Mercury Production 0.62 Secondary Nonferrous Metals Production 0.01 Secondary Zinc Production 2.4 Semiconductor Manufacturing 0.08 0.02 0.03 Sewage Sludge Incineration 0.02 0.05 0.66 0.33 0.02 0.01 0 0 0 0.65 Sheet Metal Work 0.23 0.03 0.26 0.21 0.01 Shipbuilding and Ship Repair (Surface Coating) 0 0 0 0 0.01 0 0 0 Silverware and Plated Ware 0.06 Small Arms 0.04 0.09 Small Arms Ammunition 0 Soap and Other Detergents Manufacturing 0.08 6.67 0.03 0.01 0.04 0.1 Soaps, Cleaners, and Toilet Goods 0 0 0 Softwood Drying Kilns 1.85 0.25 Softwood Veneer and Plywood 0.08 Space Research and Technology 0 0.39 0 0.04 0 0 0.06 0 0.41 0 0.05 0 Space Vehicle Parts and Equipment, nec 0.02 0.01 Special Dies, Tools, Jigs and Fixtures 0.15 0 0.08 0.03 0.26 0 0.06 Special Industry Machinery, nec 0.02 0.9 0 0.01 0.09 0.02

Speed Changers, Drives, and Gears 0.01 0.03 0.1 0.16 0 0.01 Stainless and Non-stainless Steel Manufacture - EAF 0.01 0.01 0.03 0

Page 12 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Stationary Combustion Turbines 3.14 0.04 2.21 Stationary Internal Combustion Engines 0.01 Steel and Iron Reclamation- Auto Scrap Burning 0.15 0 0.2 Steel Foundries 0.1

Steel Pipe and Tubes Manufacturing 0.25 0.19 0.3 0.3 0 0.05 Steel Springs, Except Wire 0 0 Steel Wire and Related Products Manufacturing 0.15 0.28 0.24 0.15 Surface Active Agents Manufacturing 0.03 0 1.76 0.04 0 Surgical and Medical Instruments Manufacturing 0.04 0.09 0.04 0.05 0.05 Surgical Appliances and Supplies Manufacturing 0.06 Switchgear and Switchboard Apparatus 0.04 0.06 0.05 0.01 0.01 Taconite Iron Ore Processing 0 0 0 Tanks and Tank Components Manufacturing 0 0 0.03

Telephone and Telegraph Apparatus 0.02 0 Textile Machinery 0 0 0.05 Tire Production 0.03 0.27 0.06 0 0.67 0.03 0 0 0.02 0 0.08 0 0.01 0.01 0 0 0.01 Tires and Inner Tubes (not subject to Tire Production MACT) 0.02 Toilet Preparations Manufacturing 0 0.01 Toys and Sporting Goods 0.01 Transformers, Except Electronic 0 0.07 0 0.01 0 0.01 Transmitting, Industrial and Special Purpose Elect 0
Page 13 of 14Source Category Name 1,1,2,2-Tetrachloroethane 1,2-Dichloropropane 1,3 Butadiene 1,3-Dichloropropene

7-PAH Acetaldehyde Acrolein Acrylonitrile Arsenic Compounds Benzene Beryllium Compounds Cadmium Compounds Chloroform Chromium Compounds Dioxins (2,3,7,8-TCDD) Ethylene Dichloride Ethylene Oxide Formaldehyde Hexachlorobenzene Hydrazine Lead Compounds Manganese Compounds Mercury Compounds Methylene Chloride Nickel Compounds Polychlorinated biphenyls Quinoline Tetrachloroethylene Trichloroethylene Vinyl Chloride

Source Categories Grouped as "Other" in Table of Promulgated Categories Percentage Contributions Trucking, Except Local 0.01 Turbines and Turbine Generator Sets 0.11 0.1 Unsupported Plastics Film & Sheet 0.27 0.04 1.49

Unsupported Plastics Profile Shapes 0.11 0 0.08 Welding Apparatus 0.05 0.19 0.07 0.01 Welding Apparatus, Electric 0.04 0.1 0.05 Wet Corn Milling 0.3 0.09 0.18 Wire Springs 0.3 0.04 0 0 Wood Furniture (Surface Coating) 0.04 0.03 0.01 0.05 Wood Partitions and Fixtures 0.03 Wood Preserving 0.02 0.09 Wood Products 0 0 Wool Fiberglass Manufacturing 0 0 0.18 0 X-ray Apparatus and Tubes 0.01

Cumulative percentage above 0 5 4 0 7 7 1 4 1 6 1 7 7 10 0 7 7 5 1 2 9 10 9 8 10 8 0 1 9 5

Page 14 of 14