California Code of Regulations › Title 17 - Public Health › Division 3 - Air Resources › Chapter 1 - Air Resources Board › Subchapter 10 - Climate Change › Article 2 - Mandatory Greenhouse Gas Emissions Reporting › Subarticle 3 - Additional Requirements for Reported Data › Section 95129 - Substitution for Missing Data Used to Calculate Emissions from Stationary Combustion and CEMS Sources

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
In lieu of the requirements for estimating missing data
						  in Subparts C and D of 40 CFR Part 98 , the operator of a facility who is
						  reporting emissions under section
						  95115 or
						  95112 of this article, and who is
						  not eligible for abbreviated reporting under section
						  95103(a), must
						  follow the applicable procedures of this section for estimating missing or
						  invalid data. The operator must include the substituted data in the GHG
						  emissions data report and maintain all records, calculations, and data used to
						  estimate substituted data according to the requirements of section
						  95105 and
						  40 CFR Part 98 . Alternatively,
						  under the limited circumstances specified in this section for equipment
						  breakdown, the operator may request approval of an interim data collection
						  procedure as specified in section
						  95129(h)-(i). For
						  units combusting pure biomass-derived fuels or for
de minimis
sources, the operator who is reporting emissions must follow either the
						  requirements below or the requirements of
						  40 CFR §
													98.35. In the event that section
						  95129 becomes applicable to a
						  source, compliance with the requirements of section
						  95129 does not relieve the
						  operator from complying with other sections of this article.
(a)
Missing Data Substitution
						Procedures for Units Reporting Under 40 CFR Part 75 .
The operator of
						a unit that is reporting CO2 using 40 CFR Part 75 must
						follow the applicable missing data substitution procedures in Part 75 for
						CO2 concentration, stack gas flow rate, fuel flow rate,
						high heat value, and fuel carbon content, except as otherwise provided in this
						section. Paragraphs (b) through (g) of this section do not apply to these units
						for CO2 emissions. The operator may use applicable Part
						75 missing data procedures or the procedures in paragraphs (b) through (g) of
						this section for CH4 and N2O
						emissions that are not
de minimis
if data required for
						calculating CH4 and N2O emissions
						are missing or invalid.
(b)
Missing Data Substitution Procedures for Other Units Equipped with
						CEMS
. The operator of a stationary combustion unit who monitors and
						reports emissions and heat input data for that unit under section
						95115 of this article using Tier 4
						of Subpart C (40 CFR §
													98.33(a)(4)) must follow the
						applicable missing data substitution procedures in
						40 CFR §
													75.31 to
						75.37 (revised as of July 1,
						2009). For the purpose of missing data substitution, for CEMS certified under
						40 CFR Part 60 , quality-assured data is defined according to the quality
						assurance/quality control procedures in 40 CFR Part 60. Paragraphs (c) through
						(h) of this section do not apply to units using Tier 4 for
						CO2 emissions, but do apply for
						CH4 and N2O emissions that are
						not
de minimis
if data required for calculating
						CH4 and N2O emissions are missing
						or invalid.
(c)
Missing
						Data Substitution Procedures for Fuel Characteristic Data
. When the
						applicable emissions estimation methods of this article require periodic
						collection of fuel characteristic data (including carbon content, high heat
						value, and molecular weight) the operator must demonstrate every reasonable
						effort to obtain a fuel characteristic data capture rate of 100 percent for
						each data year. When fuel characteristic data of a required fuel sample are
						missing or invalid, the operator must first attempt to either reanalyze the
						original sample or perform the fuel analysis on a backup sample, or replacement
						sample from the same collection period as specified in
						40 CFR §
													98.34(a)(2)-(3), to obtain
						valid fuel characteristic data. If the sample collection period has elapsed and
						no valid fuel characteristic data can be obtained from a backup or replacement
						sample, the operator must substitute for the missing data the values obtained
						according to the procedures in section
						95129(c)(1)-(3).
						The data capture rate for the data year must be calculated as follows for each
						type of fuel and each fuel characteristic parameter:
Data capture rate = S / T x 100%
Where:
S = Number of fuel samples for which valid fuel
						  characteristic data were obtained according to the applicable sampling
						  requirements (including sampling schedule)
T = Total number of fuel samples required by the
						  applicable sampling requirements
(1)
						If the fuel characteristic data capture rate is at least 90.0 percent for the
						data year, the operator must substitute the arithmetic average of the values of
						that parameter immediately preceding and immediately following the missing data
						incident that are representative of the fuel type. If the "after" value has not
						been obtained by the time that the GHG emissions data report is due, the
						operator must use the "before" value for missing data substitution.
(2) If the fuel characteristic data capture
						rate is at least 80.0 percent but not more than 90.0 percent for the data year,
						the operator must substitute for each missed value with the highest valid value
						recorded for that type of fuel during the data year as well as the two previous
						data years.
(3) If the operator is
						unable to obtain fuel characteristic data such that less than 80.0 percent of a
						fuel characteristic data element are directly accounted for, the operator must
						then substitute for each missed data point as follows:
(A) If historical fuel characteristics data
						are available and kept according to the requirements of section
						95105, substitute with the greater
						of the following:
1. The highest valid value
						recorded for that type of fuel for all records kept under the requirements of
						section 95105, or
2. The default value in Table 3-1 of this
						section (for carbon content) or Table C-1 of 40 CFR Part 98 (for high heat
						value). If a substitute value is not available in Table 3-1 of this section or
						Table C-1 of 40 CFR Part 98, the operator must substitute the highest value
						recorded for that type of fuel for all records kept pursuant to the
						requirements of section
						95105.
(B) For carbon content data, if historical
						fuel characteristics data are not available and a default value is not listed
						in Table 3-1 of this section, use 90 percent for other liquid and gaseous fuels
						and 100 percent for other solid fuels in substituting for missed carbon content
						data.
Table 3-1. Default Carbon
						  Content
Parameter
Missing Data
									 Value
Anthracite Coal
90%
Bituminous
85%
Subbituminous/Lignite
75%
Oil
90%
Natural Gas
75%