Addendum to Appendix 3 

Vancouver Portion of the Portland-Vancouver Ozone Maintenance Plan 

Emission Inventory Methodology / Documentation 

Table of Contents 

Introduction 

1. Point Sources 

2. Area Sources 

3. On-road Mobile Sources 

4. Non-road Mobile Sources 
Introduction 

This document provides more detail on the emission inventories found in the Vancouver Portion 

of the Ozone Maintenance Plan. For purposes of this Plan, Clark County emissions are used to 

represent the Vancouver Portion of the AQMA since most of Clark County’s industrial and 

commercial activities and the majority of its population are located in or near the AQMA. Also, 

using countywide estimates will facilitate comparison with future year National Emission 

Inventory submittals. The attainment year (base year) emission inventory (2002) for area sources, 

non-road mobile and on-road mobile sources and Title 5 point sources reflects the 2002 

Consolidated Emissions Reporting Rule (CERR) National Emission Inventory (NEI) submitted 

by DEQ and SWCAA with few exceptions and is documented in Appendix 3 and 4. The 2015 

emissions forecast used in the modeling study reflects 2002 emissions, increased by expected 

growth in various sectors. Growth factors for various source sectors were derived from the 2002 

“Economic Report to the Metro Council, 2000-2030 Regional Forecast for the PortlandVancouver, Metropolitan Area”, (see Appendix 5). 

Following are the 2002 Attainment Inventory and the 2015 Growth Projection Inventory 

summaries. 
Place here: 

 2002 Attainment Inventory – (filename: Master Planning 2002 2015 all categories 

summary, tab: attain-ei-2002) 

 2002 Attainment Inventory; 2015 Growth Projection Emission Inventory - (filename: 

Master Planning 2002 2015 all categories summary, tab: maint-project-ei 2002-2015) 
1. Point Sources

Point source data is based on data submitted by permitted facilities and reflects actual 2002 

emissions reported in annual reports to SWCAA. Within the Portland-Vancouver AQMA, large 

industrial point sources that emit more than 10 tons/year of VOC, 40 tons/year of NOx, or 100 

tons/year of CO were inventoried. Outside of the Portland-Vancouver AQMA but within 25 

miles of the AQMA boundary, point sources that emit more than 40 tons/year of NOx or 100 

tons/year of VOC or CO were inventoried. 

Fourteen sources were counted as large point sources for the Portland Vancouver AQMA. One 

source, Noveon Kalama (formerly Kalama Chemical, now Emerald Kalama) was identified as 

meeting the criteria outlined above within the 25 mile boundary of the AQMA. Twenty one 

sources were considered small point sources and were included in the area source category under 

small point sources. A spreadsheet showing SCC Codes for both large and small point sources 

follows. 

Emissions from these point sources may be included in values arrived at using the area source 

estimation methods and so there is potential for double counting of emissions from these sources. 

In order to avoid double counting, SCC codes from point sources were evaluated to determine if 

these emissions were estimated as part of area source estimates. The only point source falling into 

the commercial/institution distillate oil and natural gas boiler categories (10300603) was the 

Clark Public Utilities/ River Road Generating Project. Emissions from this source were not 

subtracted from the Area Source Category (commercial/institutional natural gas boiler category 

2403006000) because these emissions were determined to be insignificant. In cross-walking the 

SCC and SIC codes for point and area sources for the Surface Coating category, there was no 

overlap found. These two codes address different types of point sources. The SIC code covers 

wood cabinets, fabricated structural metal and household AV equipment. The area sources SCC 

codes cover factory finished wood, metal cans, machinery, motor vehicles and more. There were 

no point source components found in the SCC Code series 401002xx, and 401003xx, the 

degreasing category. Graphic Arts point sources beginning with 405 overlap the area source 

Graphic Arts category. Emissions from these sources were subtracted from the area source 

Graphic Arts category. Emissions from Tetra Pak, The Columbian and the Bemis Company from 

the SCC code category series 405xx were subtracted from the Area Source Graphic Arts 

category. See the following Point Source Component Adjustment spreadsheet for details. 

2015 point source projections were calculated using actual 2002 emissions values and increased 

by expected employment projections for each industry at the growth rate shown in the Metro 

report. Table A13 (page 107) in the modeling report shows which Metro codes correspond to 

specific SIC codes. Then, Table A.6 (page 101) shows the Metro code corresponding to the 

linear, non-compounding growth factor. For example, Attbar belongs to SIC code 3089. SIC code 

series 30 corresponds to Metro Code 18 - Durable Goods, other. 2002 VOC emissions from 

Attbar are multiplied by the Metro growth rate of 2.21% and thirteen years of growth, then 2002 

emissions are added in to project emissions of 53 tons for Attbar for 2015 (equation shown 

below). 

Example: Attbar SIC 30 = Metro 18 - Durable Goods, other 

2002 

VOC SIC metro no 

Linear compounding factor from 

Table A.6 

41.4 3089 18 2.21%

2015 VOC= 53.29 41.4 + (41.4 * 0.0221 * 13) = 53.2942

2002 base year + (2002 base year * linear non-compounding growth factor * 13 growth years) = 2015 projection 
The assumptions and values for the point source growth projections and maintenance 

demonstrations are shown in the 2002 Attainment, 2015 Growth Projection and 2015 

Maintenance Demonstration Inventory Summary spreadsheet that follows. The growth projection 

and maintenance demonstration scenarios are described in detail in Section 5.0 of the Plan.
Place here: 

 Point Sources 2002 - (filename: Master Planning 2002 2015 all categories summary, tab: 

point02) 

 SCC Codes detail for Large Sources – 2002 (filename: WA 2015 PTE Work_rev2, tab: 

SCC Summary-large sources-02) 

 SCC Codes detail for Small Sources – 2002 - (filename:WA 2015 PTE Work_rev2, tab: 

SCC Summary-small sources-02) 

 Point Sources 2015 - (filename: Master Planning 2002 2015 all categories, tab: point15 

 Point Source Component Adjustment of Area Source Emissions (filename: WA 2015 

PTE Work_rev2;tab: dbl-count-areasource) 

 2002 Attainment, 2015 Growth Projection and 2015 Maintenance Demonstration 

Inventory Summary – (filename: WA 2015 PTE Work_rev2;tab: pointsource-proj-maint 
2. Area sources

Area source emissions were taken from the NEI with few exceptions. These emissions were 

calculated following EPA guidance for the 2002 NEI. The future year (2015) emission inventory 

was developed using growth factors depending on the surrogates developed for each source 

category. Federally mandated control strategies and foreseeable changes were also taken into 

account. The 2015 emissions inventory assumes a linear, non-compounding population growth 

rate of 1.8% per year, and household growth rate of 2.0% per year from the Metro Report. With 

the exception of stage II (vehicle refueling), each area source category SCC code was assigned 

one of these growth factors. Stage II emissions for 2015 were calculated specifically for 2015 and 

are documented in the Onroad Mobile documentation in the Onroad section below. 

The area source emission inventory was adjusted to reflect summertime conditions when used in 

the modeling analysis and maintenance demonstration. 

See the following documentation for methodology description for the specific area source 

categories listed below from the 2002 Washington inventory (From the Washington State Base 

Year 2002 County Inventories, Prepared by Washington State Department of Ecology Air Quality 

Program, Sally Otterson, Beth Stipek, July 15, 2004, (3-3-2006: locomotive correction)). 

 Locomotives (3.7) 

 Prescribed Burning (there was no growth projection for this category) (3.8) 

 Residential Yard and Trash waste (3.10 and 3.11) 

 Architectural coatings (3.13) 

 Commercial/Consumer solvents (3.14) 

 Residential Wood Combustion (3.15) 

Traffic Markings values were calculated using gallons used per person and the emission factor 

from the EIIP Chapter 14 (5/17/97) to obtain lb VOC/person. Then, using population projections, 

VOC emissions were calculated for this category. See the traffic markings spreadsheet below for 

details. 

Graphic Arts Inventory emissions were calculated based on EIIP Volume III, Chapter 7 

(11/18/96) Alternate Method 2 which multiplies projected 2015 population by the EIIP emission 

factor of 1.3 lbs VOC/person. 

The 2002 values reported for Stage I gas underground tank filling emissions are projected to 2015 

based on population projections. Stage II gas dispensing emissions for 2002 were calculated by 

SWCAA; Stage II emissions for 2015 were calculated by DOE; methodology is shown in the 

Onroad Mobile documentation in the Onroad section below. 
Place here: 

 Listed sections of : Washington State Base Year 2002 County Inventories, Prepared by 

Washington State Department of Ecology Air Quality Program, Sally Otterson, Beth 

Stipek, July 15, 2004, (3-3-2006: locomotive correction) pages 32-58 (page numbers on 

modified document attached 44 – 77 except for Section 3.12 Dry Cleaning, page 60, and 

Section 3.9 Agricultural Burning pages 50-54) page numbers do not match up with 

original DOE document 

 WSU Modeling Report (Appendix 4) Appendix B: Area Source Category Emission 

Calculation Methodologies, pages 108-110 

 Traffic Markings (filename: 2015 Master_areasources, tab: Traffic Markings) 
3. Onroad (mobile) Sources

On-road mobile source emissions for the attainment inventory were calculated using Mobile 6.2 

emissions and traffic data from the Southwest Washington Regional Transportation Council 

(RTC) by Washington Department of Ecology. Gasoline vehicles are a significant source of 

VOC and NOx emissions, as are diesel powered vehicles. Differences occur between the 

Maintenance Plan Emission inventory values for mobile sources and the output values in the 

report below due to differences in rounding. Documentation for these calculations follows. 

 

 Onroad Mobile section of documentation from DOE’s Sally Otterson’s analysis 

conducted on May 31, 2006. (filename: swmaint_rev.doc) 
4. Nonroad Mobile Sources

Nonroad mobile sources, excluding ships, locomotives and aircraft were calculated using EPA’s 

Nonroad2004 model to estimate emissions by Washington DOE. Nonroad sources are shown and 

included on both the 2002 and 2015 projection and maintenance inventories. Emission from 

Locomotives from the CERR inventory from area source category series 2285xx for Passenger 

Trains, Class I operations, Yard Locomotives, were added to the Nonroad summary. 

Documentation for these calculations follows. 

SWCAA did not calculate Columbia River ship traffic emissions (Commercial Marine) as 

emissions from these sources were calculated by DEQ. 

Emissions from locomotives from the CERR inventory from area source category series 2285xx 

for Passenger Trains, Class I operations, Yard Locomotives, were added to the Nonroad 

summary. 

Place here: 

 Nonroad Section of documentation from DOE’s Sally Otterman analysis conducted on 

May 31, 206. (swmaint_rev.doc)