Central California Ozone Study (CCOS) - Desert Research Institute

CCOS Field Operations Plan Version 2: 5/31/00
testing the performance of the photochemical model. When the 2000 annual average inventory
is ready, it will be gridded to replace the forecasted 2000 inventory. Day-specific data will
replace the gridded annual average inventory. Results from contracts will be incorporated into
the annual average inventory and/or the day-specific inventories.
6.2 Requirements for Quality Control and Quality Assurance of Emission Inventory
The EICG is placing special emphasis on ensuring consistency in emission inventory
preparation procedures between all the districts in the modeling domain. The Air Resources
Board will take the lead in coordinating and ensuring quality control and quality assurance
standards for the emission inventory portion of the study. Specific guidelines will be outlined for
assisting state and local agencies for implementing more uniform and systematic approaches to
collecting, compiling (formats and accuracy), and reporting emission inventory data. Also, to
ensure good quality control practices, the EICG will be developing a comprehensive quality
control and quality assurance plan. The plan will include items such as:
• Quality control checks for collecting non-emission data, updating activity data, and using
appropriate emission factors for calculating emissions;
• Emission calculation methodology;
• Updating or revising categories to ensure that the latest methodology is used;
• Data submittal;
• Data correction;
• Documentation; and
• Quality review of the entire inventory.
6.3 Proposed Contractor Studies for Emission Inventory Development
The collection of most of the emission inventory data discussed in the previous sections
will be provided by public agencies as in-kind contributions to the CCOS study. However, there
are some critical elements of the CCOS emission inventory that the members of the EICG do not
have sufficient resources and /or expertise to provide. In general, these needs relate to the spatial
and temporal distribution of emissions from motor vehicles and other area sources. The
emission inventory elements, which will need to be supported by the CCOS study, are listed
below.
6.3.1 Day-Specific Traffic Count Information
Day-specific traffic count information will be gathered during the field study. These
traffic counts are used to create factors to adjust the travel demand volumes to hourly vehicle
volumes. A scoping study is planned to review the availability of traffic data and develop a
Chapter 6: EMISSION INVENTORY DEVELOPMENT 6-2