Ill. Admin. Code tit. 35, § 229.140
b) When conducting a performance test for an HMIWI, the owner or operator shall:
c) The owner or operator of an HMIWI shall submit a test plan to the Agency at least 45 days before conducting a performance test pursuant to this Part. Performance test plans shall include the following:
3) A description of the specific conditions under which the test will be performed, including, at a minimum:
This Section applies during all performance tests.