(a) General provisions. (1) In addition to any other procedure required under this subpart, an auditor must perform the procedures specified in this section for a gasoline manufacturer.

(2) The auditor performing the procedures in this section must meet the laboratory experience requirements specified in § 1090.55(b)(2).

(3) In cases where the auditor employs, contracts, or subcontracts an external specialist, all the requirements in § 1090.55 apply to the external specialist. The auditor is responsible for overseeing the work of the specialist, consistent with applicable professional standards specified in § 1090.1800.

(4) In the case of quality control testing at a third-party laboratory, the auditor may perform a single attestation engagement on the third-party laboratory for multiple gasoline manufacturers if the auditor directly reviewed the information from the third-party laboratory. The third-party laboratory may also arrange for the auditor to perform a single attestation engagement on the third-party laboratory and make that available to gasoline manufacturers that have testing performed by the third-party laboratory.

(b) Non-referee method qualification review. For each test method used to measure a gasoline parameter as specified in a report submitted under subpart J of this part that is not one of the referee procedures listed in § 1090.1360(d), the auditor must review the following:

(1) Obtain supporting documentation showing that the laboratory has qualified the alternative test method by meeting the precision and accuracy criteria specified under § 1090.1365.

(2) Report a list of the alternative test methods used.

(3) Confirm that the gasoline manufacturer supplied the supporting documentation for each alternative test method and report any exceptions.

(4) If the auditor has previously reviewed supporting documentation under this paragraph (b) for an alternative test method at the laboratory, the auditor does not have to review the supporting documentation again.

(c) Reference installation review. For each reference installation used by the gasoline manufacturer during the compliance period, the auditor must review the following:

(1) Obtain supporting documentation demonstrating that the reference installation followed the qualification procedures specified in § 1090.1370(c)(1) and (2) and the quality control procedures specified in § 1090.1370(c)(3).

(2) Confirm that the laboratory completed the qualification procedures and report any exceptions.

(d) Instrument control review. For each test instrument used to measure gasoline parameters for batches selected as part of a representative sample under § 1090.1810, the auditor must review whether test instruments were in control as follows:

(1) Obtain a listing from the laboratory of the instruments and period when the instruments were used to measure gasoline parameters during the compliance period for batches selected as part of the representative sample under § 1090.1810.

(2) Obtain statistical quality assurance data and control charts demonstrating ongoing quality testing to meet the accuracy and precision requirements specified in § 1090.1375 or 40 CFR 80.47, as applicable.

(3) Confirm that the laboratory performed statistical quality assurance monitoring of its instruments under § 1090.1375 and report any exceptions.

(4) Report as a finding any test result that was excluded for being out of control and the laboratory did not have an assignable cause with appropriate supporting justification.

(5) Report as a finding the listing of instruments obtained under paragraph (d)(1) of this section and the compliance period when the instrument control review was completed.