Document ID: EPA-HQ-OAR-2023-0239-0024
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2023-05-30T04:00Z

Benzene Content in Gasoline Spreadsheet Example Key 
                              Compliance Division
                   Office of Transportation and Air Quality
                     U.S. Environmental Protection Agency
                                   May 2023
                                       
                                       
 
 
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PBMS0004
                                  Disclaimer

The discussion in this document is intended solely as guidance.  The statutory provisions and EPA regulations described in this document contain legally binding requirements.  This document is not a regulation itself, nor does it change or substitute for those provisions and regulations.  Thus, it does not impose legally binding requirements on EPA, States, or the regulated community.  This spreadsheet example key does not confer legal rights or impose legal obligations upon any member of the public.

While EPA has made every effort to ensure the accuracy of the discussion in this spreadsheet example key for use with its associated spreadsheet example, the obligations of the regulated community are determined by statutes, regulations, or other legally binding requirements.  In the event of a conflict between the discussion in this document and any statute or regulation, this document would not be controlling.

The general description of the self-qualification process provided here may not apply to a particular situation.  Interested parties are free to raise questions about the substance of this spreadsheet example key, its associated spreadsheet example, and its applicability to a particular situation.  EPA may adopt approaches on a case-by-case basis that differ from those described in this spreadsheet template key.

Mention of trade names or commercial products does not constitute endorsement or recommendation for their use.

This is a living document and may be revised periodically without public notice.  EPA welcomes public input on this document at any time.

Introduction: On December 4, 2020, EPA promulgated regulatory streamlining requirements (see 85 FR 78412).  

Beginning January 1, 2021, for benzene content in gasoline, a test facility must self-qualify a voluntary consensus-based standards body (VCSB) alternative test method to show that it has met the precision requirements codified in the regulations at §1090.1365(b).  A test facility must also self-qualify that it has met the qualification criteria for accuracy by conducting an ASTM D6708 assessment as codified in the regulations at §1090,1365(d).  The regulations also specify criteria for the reference installation of the EPA referee test method used to qualify accuracy of method defined alternative test method at §1090.1370.  

If your test facility was utilizing the EPA referee test method, ASTM D5769-20 (IBR 1090.95(c)(25)), the regulations provide for an exemption in meeting these precision and accuracy self-qualification requirements (see §1090.1360(d)).  It is important to note, the on-going statistical quality control requirements at §1090.1375 apply to all methods, including the EPA referee test method.

The following spreadsheet example key applies to any party self-qualifying to the PBMS requirements at §1090.1365(b) and §1090.1365(d).  This guidance deals only with the initial self-qualification of analytical test methods in meeting these precision and accuracy requirements at a testing facility for measuring benzene content in gasoline. 

The discussions of the applicable regulations in this document are not verbatim.  The reader is encouraged to read and become familiar with the applicable regulations of §1090.1360, §1090.1365, §1090.1370 and §1090.1375.  These instructions are intended to help a test facility self-qualify a VCSB analytical test method for the measurement of benzene content in gasoline.

Applicable Dates: These requirements for test method self-qualification under §1090.1365 became effective on January 1, 2021.

Note: Please see below for instructions on use of this spreadsheet example key along with its associated spreadsheet example for benzene content in gasoline which is provided by the Agency for determining compliance with the precision criteria of § 1090.1365(b) in Part I, the ASTM D6708 accuracy assessment requirements of § 1090.1365(d) in Part II and reference installation requirement of §1090.1370 along with other PBMS information in Part III.  We encourage parties to use this spreadsheet example key and its associated spreadsheet example for benzene content in gasoline as an affirmative defense in meeting the PBMS requirements at §1090.1360, §1090.1365, §1090.1370 and §1090.1375. 

Part I - Precision demonstration for benzene content in gasoline.

Precision Criteria (§1090.1365(b)) -  the maximum allowable standard deviation computed from results of a minimum of 20 tests made over 20 days on samples using good laboratory practices taken from a single homogenous commercially available gasoline must be less than or equal to 0.15 times the Reproducibility (R), where "R" equals the ASTM reproducibility (R) of ASTM D5769-20, where R=0.221x(X[0.67]), (IBR §1090.95(c)(25)).  You may make up to 4 separate measurements in a 24-hour period, as long as the interval between measurements is at least 4 hours.  Example: A 1 percent by volume benzene content gasoline sample: maximum allowable standard deviation of 20 tests less than or equal 0.15*(0.221 volume percent) = 0.0332 volume percent.1

 In the workbook entitled "draft vcsb-benzene-content-gas-test-method-sprdsht-example (1)", locate the worksheet entitled, "Benzene Precision Demonstration".  Enter precision demonstration data in the light shaded green areas of the worksheet. 
	1.	Test results should be entered to the nearest thousandth of a volume percent (0.001 volume percent).
	2.	The date and time of each test measurement must be reported.
	3.	Please include the laboratory sample test identification number for each test result. 

 After entering the data into the light shaded green area of the "Benzene Precision Demonstration" worksheet, go to the "File" menu at the top of the screen and select "Save" to save your data.  Once all the data are entered into the "Benzene Precision Demonstration" worksheet, the standard deviation of the data set (located in cell B16), and an indication as to whether the benzene precision criterion are met will be determined by the worksheet.  The indication of "PASSED" or "FAILED" is located in in the worksheet in cell B15, after the question, "Is Benzene Content Precision Criterion Met?".  If the worksheet is missing required data, an indication of "REQUIRED DATA MISSING" will appear after this question.  There is a QC data entry check for each test result in column E (i.e., if data is entered in a test result cell, an indication of "OK" will appear next to that cell, but if no data is entered in a test result cell, an indication of "DATA REQUIRED IN CELL #" will appear next to that cell).  Note: If the applicant wishes to include more than the 20 minimum tests, please report the additional data by adding rows to the spreadsheet.2  

Part II - ASTM D6708-19a Accuracy demonstration for benzene content in gasoline (§1090.1365(d)).

 In the workbook entitled "Spreadsheet Example VCSB benzene content gasoline test method", locate the worksheet entitled, "D6708 Assessment Accuracy".  Enter applicable information as discussed below in the D6708 Assessment Accuracy worksheet.

 Include information reported in the test method documentation to the user of the voluntary consensus-based standard body (VCSB) organization test method, including a description of the technology and/or instrumentation that makes the method functional.  

 Include information reported in the test method that demonstrates the test facility is using a VCSB test method ASTM D6708-19a assessment (§1090.1365(d), IBR 1090.95(c)(33)).  Indicate by typing "Yes" in cell "B15". 

 Include the correlation equation from the ASTM D6708 assessment to utilize for reporting purposes for the fuel parameter in cell "B16".  If the ASTM D6708 assessment between the candidate VCSB alternative test method and the EPA referee test method, ASTM D5769, results in a "null" comparison, then type the word "null" in cell "B16" indicating the ASTM D6708 assessment has determined the VCSB alternative test method provides equivalent results to its respective EPA referee test method, ASTM D5769 (IBR 1090.95(c)(25)).

                   -
Part III  -  Additional PBMS Information.

A.	§1090 CFR 1365. For test methods that are approved by a voluntary consensus-based standards body (VCSB) organization, such as the American Society for Testing and Materials (ASTM) or International Standards Organization (ISO), each individual test facility must demonstrate through self-qualification that the applicable for accuracy and precision criteria specified under §1090.1365 are met (Please see Part I and Part II of this spreadsheet example key).  The self-qualification of the test method is limited to the single test facility that performed the testing for accuracy and precision.

B.	§1090.1360(5)(i). Testing you performed to qualify alternative procedures under 40 CFR part 80.47 continues to be valid for making the demonstrations required in part 1090.

C.	§1090.1370. Reference installation requirements at §1090.1370 are used for grounding the EPA referee test method, ASTM D5769-20 (IBR 1090.95(c)(25) for use in the ASTM D6708-19a (IBR 1090.95(c)(33)), accuracy assessment with the candidate alternative test method.  

D.	§1090.1375. Quality Assurance procedures for benzene content in gasoline measurement instrumentation.  A test method shall not be considered a test using an approved test method unless the quality control procedures specified at 1090.1375 for both precision and accuracy are met separately for each instrument at the test facility.

E.	§1090.1345. See this section of the regulations for sample retention requirements that apply to your specific test facility.

F.	§1090 CFR 1200. Record retention requirements for approved test methods. Each individual test facility must retain records related to the establishment of accuracy and precision values, all test method documentation, and any quality control test and analysis under §1090.1365, §1090.1370 and §1090.1375 for five years.
 EPA Contact:
 FuelsProgramSupport@epa.gov