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Residential Wood Combustion Emissions Inventory Project for the MANE-VU Region. Megan Schuster, MARAMA Annual RPO Meeting, St. Louis, MO November 4-6, 2003. RWC. Background Information Survey methodology and sample frame Survey results Two approaches to analyze data Issues/ Problems.
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Residential Wood Combustion Emissions Inventory Project for the MANE-VU Region Megan Schuster, MARAMA Annual RPO Meeting, St. Louis, MO November 4-6, 2003
RWC • Background Information • Survey methodology and sample frame • Survey results • Two approaches to analyze data • Issues/ Problems
Residential Wood Combustion Project Background • Origin of RWC project: Assessment of Emissions Inventory Needs for Regional Haze Plans • RWC Emissions • High contribution to regional haze • Contribute approx. 8% of PM fine in MANE-VU region • Large uncertainty • Important local source to Class I areas • States have the potential to improve the activity data
RWC • EIIP suggested methodology: Survey • Project Intent: To estimate activity data and an emissions inventory from residential wood combustion in the MANE-VU Region through survey methodology • Contract: E.H. Pechan & Associates, Inc.
Survey • Telephone approach (CATI) • Survey questionnaire based on previous studies (esp. CARB study) • Intended to obtain information on wood burning equipment type and wood type
Survey Sample Frame • Sample frame • Includes important variables that affect activity (i.e., annual wood consumption) • Urban, suburban, or rural locations • Type of housing (single versus multi-family homes) • Forested versus non-forested areas • Latitude • Minimum sample size per cell = 61 completed surveys • Based on level of precision +/- 13.3%
RWC Sample Frame and (Number of Respondents) 1Number of responses ended up being less than the target value of 61 due to either: changes in the Disposition of one or more responses (i.e., change of address from the original sample); or dropping a response out of the final database (i.e., following QA of that response)
Pechan’s Analysis • User Fraction: fraction of households that actually burn wood • Wood consumers = 1 • Respondents that do not burn wood = 2 • Significant Difference b/w UF • Single vs Multi unit households • Geographic locations (U/S/RF/RNF) • No Significant Difference b/w HDD level • Annual Consumption: Amount of wood burned per household (cords/yr, or BTUs/yr) -- Normalized by HDD level • Significant Difference b/w HDD level • Low response rate in certain cells prompted Pechan to try to combine cells that were not significantly different
Issues/ Problems Collapsing data cells should only be based on statistical analysis Subdividing cells by equipment type necessitates a larger sample size
Alternative Analysis Approach • Calculate emissions per survey response (based on equipment and wood type) • Analysis of Variance
Analysis of Variance Corrected Mean Household Emissions for a cell = M + Ai + Bj + Ck + Dij + Ejk + Fik M = Overall mean of household emissions Ai = Mean of each applicable housing type for that cell – M Bj = Mean of each applicable geographic location (U/S/RF/RNF) – M Ck = Mean of each applicable HDD level – M Dij = mean of ith house type /jth geo location – mean ith house type – mean of j geo location + M Eik = mean of ith house type/ kth HDD level – mean ith house type – mean kth HDD + M F jk = mean of jth geo location/kth HDD level - mean of jth geo location – mean of kth HDD level + M
Future Implications • Sample frame and minimum response rate requirement critical in obtaining useful information • Survey questionnaire should not be too specific • Improve EIIP to include suggested data analysis for survey methodology
Additional MANE-VU EI Projects • Calculation sheets – Develop calculation sheets using the preferred calculation method for the top area source categories and three non-road categories • Final Sheets – January 2004 • Open Burning Project – Improve emission estimates from open burning sources (Yard Waste – Household Brush and Leaf Burning; MSW or Household Waste Burning; and Municipal Yard Waste Burning) through survey methods – completed • Final Revised Report – November 2003 • NIF 3.0 – January 2004
Additional MANE-VU EI Projects • Ammonia EI Project – Pechan is creating an emissions inventory for the MANE-VU region for industrial refrigeration, cement plants, POTWs and composting • Final EI and Report – January 2004 • Mobile Inventory - Pechan is creating a mobile emissions inventory for onroad and nonroad mobile sources • Default data based on 2002 NEI – January 2004 • Onroad MOBILE6 input files, 2002 VMT database and Nonroad input files – April 2004 • Draft Final Inventory – December 2004
Additional MANE-VU EI Projects • Compilation of 2002 Area and Point Modeling Inventories • Basis : State CERR submittals (June 2004) • Augmented with other data gathered from EI Projects (Ammonia, RWC, Open Burning), and CEM data • Absent data will be supplemented with 1999 NEI grown to 2002 (from EPA) • Final Inventory will be used for modeling PM fine and regional haze – Fall 2004
DraftStrawmanTimeline 2003 2004 2005 2006 2007 2008 1.0 PM - 2.5 Designations 2.0 Estimate Natural & Baseline Conditions 3.0 Develop SIP Template 4.0 Ongoing Technical Support Activities 5.0 Prepare Final Technical Support Documents 6.0 Identify & Analyze Alternatives for Goals & Strategies 7.0 Develop Model Rules for Selected Sources and Adopt Rules 8.0 Develop Reasonable Progress Goals 9.0 Develop Long - term Strategy Agreement, Rules, & SIP 10.0 Submit SIP Key Preparation / Follow Up Core Activity