| TITLE 35: ENVIRONMENTAL PROTECTION |
| a) | Emission units that are subject to the testing requirements set forth in Section 111 of the Clean Air Act, 42 USC 7401, Section 112 of the Clean Air Act, 42 USC 7402, or the regulations promulgated under those statutes; or |
| b) | Emission units that are being tested for emissions generated by any of the following types of waste: hazardous waste, as defined by Section 3.15 of the Illinois Environmental Protection Act [415 ILCS 5/3.15], or municipal waste, as defined by Section 3.21 of the Illinois Environmental Protection Act [415 ILCS 5/3.21]. |
| a) | The emission unit is classified as a continuous steady-state unit, a cyclic steady-state unit, or another qualifying unit; |
| b) | At least three valid test runs are conducted, subject, however, to the provisions of Section 283.240(c) of this Part; and |
| c) | Each of the test runs to be averaged is performed according to the test plan submitted to the Agency prior to the test, pursuant to the provisions of Section 283.220 of this Part, or as may otherwise be modified and approved, according to the provisions of Section 283.230 of this Part. |
| a) | A test plan must be submitted to the Agency when an owner or operator of an emission unit intends to average emissions tests results for that unit. | |
| b) | A test plan must be submitted to the Agency for review prior to conducting any emissions test when any one of the following applies: |
| 1) | The Agency makes a written request for a test plan; |
| 2) | A non-standard test method or procedure is to be used; |
| 3) | A source seeks to test at operating parameters that differ from the maximum parameters specified in its operating permit; |
| 4) | A source seeks to deviate from a prior test plan for that emission unit; or | |
| d) | Notwithstanding subsections (a), (b), and (c) above, a test plan need not be submitted under the following circumstances: |
| B) | Date the previously submitted test plan was submitted to the Agency; and | |
| C) | A statement that the source is relying on a previously submitted test plan. |
| A) | The purpose of the test; and | |
| B) | The standard test method or procedure to be used. |
| a) | The owner or operator of an emission unit, or an authorized representative, may change the procedures, methods, or operating parameters of the emissions test at the time of the emissions test, provided that the change is a minor deviation as defined in Section 283.130 of this Part. The emission unit owner or operator shall ensure that documentation of the change is submitted to the Agency along with the test results. |
| b) | If the owner or operator of an emission unit elects to use the provisions of subsection (a) of this Section, the following procedures shall apply, depending on the relevant circumstances: |
| 1) | If a representative of the Agency is on-site for the purpose of witnessing the emissions test, the owner or operator of the emission unit or an authorized representative may request permission from the Agency’s representative to change the procedures, methods, or operating parameters of the emissions test as specified in the test plan, submitted pursuant to the provisions of Section 283.220 of this Part, provided that the change is a minor deviation, as defined in Section 283.130 of this Part. |
| A) | If the Agency representative approves the minor deviation, all test runs performed with this minor deviation may not be deemed invalid test runs by the Agency on the sole basis of the minor deviation. |
| B) | If the Agency representative disapproves the change to the procedures, methods, or operating parameters of the emissions test as specified in the test plan, then the owner or operator of the emission unit or an authorized representative may elect to perform the emissions test with the change. However, the Agency may subsequently disapprove the emissions test results if it finds that a valid test run was not obtained as a result of the change. |
| Section 283.240 | Averaging Procedure |
| a) | The average of the emissions tests results shall be determined by the arithmetic average of three valid test run results, as long as the test runs are conducted in conformance with either the provisions of an approved test plan or with a test plan that has been modified in accordance with Section 283.230 of this Part. |
| b) | Notwithstanding subsection (a) of this Section, if the owner or operator of an emission unit elects to perform more than three test runs, then the average shall be calculated based upon the results of all valid test runs. |
| c) | Notwithstanding subsection (a), in the event that a sample is accidentally lost or conditions occur in which one of the test runs must be discontinued because of forced shutdown, failure of an irreplaceable portion of the sample train, extreme meteorological conditions, malfunction or other dissimilar or non-representative circumstances, upon the owner’s or operator’s documentation of the existence of any of the circumstances set forth in this subsection (c) and verification by the Agency that the conditions existed, compliance may be determined by using the arithmetic average of the test results of all remaining valid test runs; however, a minimum of two valid test runs is required to determine compliance. |
| Section 283.250 | Compliance Determination |
| a) | An emission unit will be determined to be in compliance with the applicable limitation, standard, or permit conditions when the average of the test results is either at or below the emission limit, standard, or permit conditions, and the test plan for the emission unit, submitted in accordance with Section 283.220 of this Part or as modified in accordance with Section 283.230 of this Part, has not been disapproved by the Agency. |
| b) | If an owner or operator of an emission unit does not meet the criteria for averaging under Section 283.240 of this Part, then each individual valid test run shall be required to meet the applicable limitation, standard, or permit conditions in order to demonstrate compliance. |