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2012 Community Greenhouse Gas Inventory
Arlington County, Virginia
August 2013
Prepared by:
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Table of Contents 1 Executive Summary ............................................................................................................................... 1
2 Buildings Sector ..................................................................................................................................... 5
2.1 Buildings Sector Results ................................................................................................................ 5
2.2 Buildings Sector Methodology ...................................................................................................... 7
2.2.1 Stationary Combustion Methodology ................................................................................... 7
2.2.2 Electricity Methodology ...................................................................................................... 11
2.2.3 Buildings Sector Data Summary .......................................................................................... 11
2.2.4 Buildings Sector Emission Factors ....................................................................................... 13
3 Community Transportation Sector ..................................................................................................... 15
3.1 Community Transportation Sector Results ................................................................................. 15
3.2 Pass‐Through and County Origin/Destination Traffic ................................................................. 16
3.2.1 Pass‐Through and County Origin/Destination Traffic Methodology .................................. 16
3.3 WMATA – Metrobus and Metrorail ............................................................................................ 20
3.3.1 Metrobus and Metrorail Results ......................................................................................... 20
3.3.2 Metrobus and Metrorail Methodology ............................................................................... 20
3.4 Taxis ............................................................................................................................................ 23
3.4.1 Taxi Results.......................................................................................................................... 23
3.4.2 Taxi Methodology ............................................................................................................... 24
3.5 University Shuttles ...................................................................................................................... 25
3.5.1 University Shuttles Results .................................................................................................. 25
3.5.2 University Shuttles Methodology ....................................................................................... 25
4 Solid Waste Sector .............................................................................................................................. 27
4.1 Solid Waste Sector Results .......................................................................................................... 27
4.2 Solid Waste Sector Methodology ............................................................................................... 27
4.2.1 Landfill Process Methodology ............................................................................................. 27
4.2.2 Waste‐to‐Energy Methodology .......................................................................................... 28
4.2.3 Waste Collection and Transportation Methodology .......................................................... 28
4.2.4 Solid Waste Sector Data ...................................................................................................... 29
4.2.5 Solid Waste Sector Emission Factors .................................................................................. 30
4.2.6 Solid Waste Sector Assumptions ........................................................................................ 31
5 Non‐County Government Sector ........................................................................................................ 32
5.1 Non‐County Government Sector Results .................................................................................... 32
5.2 Non‐County Government Sector Methodology .......................................................................... 33
5.2.1 Non‐County Government Sector Data ................................................................................ 33
5.2.2 Non‐County Government Sector Assumptions ................................................................... 33
1
1 Executive Summary This report contains the greenhouse gas (GHG) emissions for the Community of Arlington County for calendar year (CY) 2012. The purposes of this report are to measure progress toward Arlington’s recently established Community emissions target of 3.0 metric tons of carbon dioxide equivalent (mtCO2e) per resident per year by CY 2050 as defined in the County’s Community Energy Plan1, and to document the methodologies, assumptions and data sources used to calculate emissions. The Arlington Initiative to Rethink Energy (AIRE) will use these and future greenhouse gas emissions inventories to guide the specific programs and tools it offers to the community to lead the way to smart energy choices that reduce emissions.
In 2012 Arlington Community emissions totaled 2,403,295 metric tons CO2e, of which 91,267 metric tons CO2e were attributable to the County Government and 2,312,028 metric tons CO2e from other County sources. This equates to a per capita emissions level of 11.3 metric tons CO2e, an achievement representing a 13 percent decrease in per capita emissions relative to the CY 2007 baseline. On an absolute basis, Community emissions improved by 10 percent relative to CY 2007 and 8 percent relative to CY 2000 despite population growth. Arlington’s population reached 212,900 residents in 2012 which represents growth of 3 and 12 percent relative to CY 2007 and CY 2000, respectively.
Table ES.1: Arlington County Total Community Emissions and Emissions Per Capita
Metric 2000(reference) 2007
(baseline) 2012 % Change 2007‐2012
Community Emissions (mtCO2e) 2,515,238 2,572,871 2,312,028 ‐10% County Government Emissions* 95,383 96,120 91,267 ‐5% Population (resident) 189,453 206,800 212,900 3% Per Capita Emissions (mtCO2e/resident) 13.8 12.9 11.3 ‐13%
*Emissions listed here are the total Government Operations inventory, including Arlington Schools, and are different from the net government operations emissions, which track achievement of the AIRE 2012 goal and are separate and additional to the gross inventory total compiled according to the LGOP. Excluding the County Government emissions portion of the community, Commercial and Residential buildings contributed more than 60 percent to Community emissions in CY 2012 at 1,436,567 metric tons CO2e. The transportation sector contributed more than one‐third of Community emissions at 836,434 metric tons CO2e and the solid waste sector emitted 39,027 metric tons CO2e or about 2 percent. All three sectors reduced emissions relative to CY 2007. The largest percent reduction occurred in the solid waste sector with a total reduction about 21 percent. The buildings sector reduced emission by 15 percent and the transportation sector achieved a modest reduction of 1 percent.
1 http://freshaireva.us/2012/04/energyplan/
2
Figure ES.1: Total Community Emissions by Sector and Inventory Year
About half of Community emissions were the result of purchased electricity in commercial and residential buildings and by Metrorail trains and infrastructure. Emissions from purchased electricity totaled 1,206,608 metric tons CO2e in CY 2012, a 12 percent reduction from CY 2007. Slightly more than one‐third of Community emissions were generated by mobile combustion of gasoline, diesel and compressed natural gas (CNG) in private vehicles, heavy duty commercial vehicles, community transit vehicles and waste haulers. Mobile combustion emissions were virtually unchanged between CY 2007 and CY 2012 at slightly more than 800,000 metric tons CO2e. The majority of r