The operator that combusts fuels or fuel mixtures that are at least 5 percent biomass by weight and not pure biomass, except waste-derived fuels that are less than 30 percent by weight of total fuels combusted for the report year, shall determine the biomass-derived portion of CO2 emissions using ASTM D6866-06a as specified in this article. The operator shall conduct ASTM D6866-06a analysis at least every three months, and shall collect each gas sample for analysis during normal operating conditions over at least 24 consecutive hours. The operator shall divide total CO2 emissions between biomass-derived emissions and non-biomass-derived emissions using the average proportionalities of the samples analyzed. If there is a common fuel source to multiple units at the facility, the operator may elect to conduct ASTM D6866-06a testing for one of the units.
In lieu of the method provided in section 95125(h)(1), operators of facilities that combust biomass solid fuels, waste-derived fuels, or municipal solid waste may elect to calculate CO2 emissions using ARB approved source specific emission factors derived from source tests conducted at least annually under the supervision of ARB or the local air pollution control district or air quality management district. For fuels or fuel mixtures that contain at least 5 percent biomass by weight but are not pure biomass, the source test protocol shall include determination of the biomass-derived portion of CO2 emissions as specified in section 95125(h)(2) if applicable. Upon approval of a source test plan by ARB, the source test procedures in that plan shall be repeated in subsequent years to update the source specific emission factors annually. In the absence of source specific emission factors approved by ARB, the operator shall determine CO2 emissions using a method otherwise specified for the source in this article.
Method for Calculating Mobile Combustion Emissions.
For operators choosing to report mobile source combustion emissions, the operator shall use the following equation to compute mobile combustion CO2 emissions for the report year by fuel type:
= Fuel * EFCO2
= emissions from mobile combustion by fuel type, metric tonnes per year
= volume of fuel consumed, gallons per year = default emission factor by fuel type provided in Appendix A, kg Fuel EF CO2 C O 2 / g a l l o n 0.001 = conversion factor to convert kg to metric tonnes
The operator shall obtain data on the volume of fuel consumed during the report year from fuel records data (including bulk fuel purchase records,