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Three-State Air Quality Study (3SAQS) Three-State Data Warehouse (3SDW)

Three-State Air Quality Study (3SAQS) Three-State Data Warehouse (3SDW). Reconciling the 3SAQS and 2011 NEI O&G Emission Inventories University of North Carolina (UNC-IE) ENVIRON International Corporation (ENVIRON ) July 28, 2014. Problem Statement.

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Three-State Air Quality Study (3SAQS) Three-State Data Warehouse (3SDW)

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  1. Three-State Air Quality Study (3SAQS)Three-State Data Warehouse (3SDW) Reconciling the 3SAQS and 2011 NEI O&G Emission Inventories University of North Carolina (UNC-IE) ENVIRON International Corporation (ENVIRON) July 28, 2014

  2. Problem Statement • The NEI national O&G inventory includes the basins in the 3SAQS O&G inventory • To avoid double counting sources, we need to remove the inventory records from the NEI that are contained in the 3SAQS inventory • To facilitate use of the 3SAQS NEPA modeling platform, we need to isolate all of the O&G records in the NEI into explicit “point O&G” and “area O&G” processing sectors

  3. Why this is important • When modeling for a new O&G project, may need to replace the records in the NEI with the project inventory records • Updated base year O&G inventories may also require replacing inventory records in the NEI • By identifying and isolating all of the NEI O&G inventory records: • Streamline the replacement/update process • Minimize the opportunities for double counting emissions

  4. Reconciliation Approach • Identify and remove the records for the 12 O&G basins covered by the 3SAQS inventory from the 2011 and 2020 NEI • Different approaches for area and point O&G inventories

  5. Area Source Reconciliation • An SCC-based search through the NEI sectors found that all area O&G sources are contained in the “np_oilgas” sector • State/county (FIPS) codes in the 3SAQS inventories used to isolate and remove the 3SAQS records from the NEI • Paradox and Raton basin area sources extracted from the NEI and processed with the 3SAQS inventories • Only found records in the 2011 NEI, none in 2020

  6. Point Source Approach • A NAICS-based search through the NEI found O&G sources in both the “pt_oilgas” and “ptnonipm” sectors • EPA used SCC codes to create the pt_oilgas sector in the NEI and left many O&G records in the ptnonipm sector • Different approaches for pt_oilgas and ptnonipm sectors

  7. Point O&G Source Approach • State/county (FIPS) codes in the 3SAQS inventories used to isolate and remove the 3SAQS records from the NEI • Remove and discard from the NEI all Southern Ute Indian Tribe records and Navajo Nation sources outside of Arizona • NAICS code search through the remaining “non-3SAQS basin NEI pt_oilgas” inventory found several non-O&G records; move these to ptnonipm

  8. Point non-IPM Source Approach • State/county (FIPS) codes in the 3SAQS inventories (including tribal sources) used to separate the NEI into 3SAQS-basin and non-3SAQS-basin records • Find and isolate O&G sources using NAICS codes and the strings “gas plant” and “compressor sta” • Discard the O&G records found for the 3SAQS basins • Move the O&G records for sources outside of the 3SAQS basin to the pt_oilgas processing sector

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