# Carbon Monoxide Maintenance Plan Greeley

Technical Support Document Emission Inventory

December 17, 2009 Colorado Departmentof Public Health and Environment Air Pollution Control Division 4300 Cherry Creek Drive South Denver, Colorado 80246Colorado DepartmentofPublic Health and Environment/ AirPollution Control Division



# Table ofContents 1. EMISSION INVENTORY METHODOLOGY 1 2. 2007 EMISSION INVENTORY SUMMARY 2 3. REFERENCES 3

December 17, 2009 

### coMamtenance Plan for Greeley

- Technical SupportDocument

- EmiSSion Inventory iiColorado Department ofPublic Health and Environment / Air Pollution Control Division



## 1. Emission Inventory Methodology The Air Pollution Control Division (APCD) developed the 2007 emission inventories in the "CarbonMonoxide Maintenance Plan for Greeley" using U.S: Envirorunental Protection Agency (EPA) approved emissions modeling methods, including EPA'sMOBILE6 model and local VMT datafor on-road mobile source emissions, EPA's non-road model, local demographic information for area and off-road sources, and reported actual emissions for point sources. The inventory represents average daily winter emissions. The MOBILE6 and non-road model inputs represent these average daily winter conditions. Heating and wood burning emissions were apportioned from annual emission estimates by heating degree day datafrom the Western Regional Climate Center. Other source categories were apportioned from annual to daily by dividingby 365. Highway mobile source emissions are from the EPA model MOBILE6, an emission factor model for predicting gram per mile emissions ofHydrocarbons (HC), Carbon Monoxide (CO), Nitrogen Oxides (NUx), Carbon Dioxide (C02), Particulate Matter (PM), andtoxics from cars, trucks, and motorcycles under various conditions. Non-road source emissions are from the EPANon-Road Model. This model includes the impact of future controls on non-road engines, which is used in equipment such as lawn and garden equipment and construction equipment. Area source emissions (includingheating, construction, railroads, etc.) are from the 2002 EPA National Emissions Inventory (NEI) and grownto 2007by population growth from datafrom the State. For more documentation for these categories, refer to the NEI documentation (EPA, 2008). Under Air Quality Control CommissionRegulationNo.3,the APCDrequires any source that emits two tons per year orgreaterto submit an Air Pollutant EmissionNotice (APEN) (APCD, 2008). This means that sourcesthat emit less than two tons per year are not necessarily accounted for in an emissions inventory. The point source emissions for Greeley were obtained from this tracking system. The emission estimates are made using a variety ofmethodologies. Datafrom source-specific emissiontests, or continuous emission monitors are preferable, but not always available. The EPA has developed a variety ofemission factors to estimate emissions as well. Emission factors are frequently the best oronly method available for estimating emissions. Oil and Gas Emissions (O&G area and O&Gpoint) from oil and gas exploration and development sources are based on the 2006 and 2010 Independent Petroleum Association ofMountain States (IPAMS) Inventory and the Norwest Corporation Study ofoil and gas growth from 2010 to 2020 for the DJ Basin.

December 17, 2009 CO Maintenance Plan/or Greeley

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- EmiSSIOn Inventory 1Colorado DepartmentofPublic Health and Environment/ Air Pollution Control Division 

## 2. 2007 Emission Inventory Summary This sectionpresents the 2007 emission inventories for the maintenanceplan. 

### Table 1. 

### 2007 CARBON MONOXIDE Emission Inventory (tons perday). 

### CO Bio entc 0.00 Commercial Cookln 0.05 Fuel Combustion 0.55 Hi hwa Vehicles 55.36 Non O&G POInt Sources 0.58 Non-Road 17.81 O&G area 0.02 O&G Oint 0.03 Railroads 0.04 Structure Fires 0.03 Woodburnm 6.75 81.23

SWIFT BEEF COMPANY 0.05 NORTHERN CO MEDICAL CTR 0.01 NORTHERN CO CREMATORY INC 0.00 THERMO POWER & ELEC INC 0.0 SCHULTE INVESTMENTS WAS ELSRO INC 0.00 CITY OF GREELEY WATER POLLUT CONTROL FAC 0.00 MEADOW GOLD DAIRY 0.01 THERMO GREELEY INC 0.27 LAFARGE WEST, INC.
- 35TH AVE PLANT 0.06 UNIV OF NORTHERN COLORADO 0.10 HUMANE SOCIETY OF WELD COUNTY 0.00 AGGREGATE INDUSTRIES
- WCR, INC. 0.03 TOTA 0.58

December 17, 2009 COMaIntenance Planfor Greeley

- TechnIcalSupportDocument

- EmIssIOn Inventory 2ColoradoDepartment ofPublic Health and Environment/ Air Pollution Control Division


## 3. References APCD, 2008. Air Quality Control Commission RegulationNumber 3. Stationary Source Permitting and Air PollutantEmissionNotice Requirements. 5 CCR 1001-5. 

### <http://www.cdphe.state.co.us/regulations/airregs/l00103stationarysourcepermitting.pdf> U.S. EPA, 2008. "2002National Emissions Inventory Data & Documentation." 

### <http://www.epa.gov/ttn/chief/net/2002inventory.html#documentation>

December 17, 2009 COMaintenance Planfor Greeley

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- EmIssIOn Inventory 3