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(4) With respect to hydrocarbons and photochemical oxidants, it may be assumed that (i) there is no background concentration of photochemical oxidants and (ii) the degree of total hydrocarbon emission reduction necessary for attainment and maintenance of the national standard for photochemical oxidants will also be adequate for attainment of the national standard for hydrocarbons. The proportional model to be used to determine the necessary hydrocarbon emission reduction is set forth in Appendix J to this part.
(5) The plan shall show that the control strategy including transportation control measures will result in the degree of emissions reduction indicated to be necessary by a proportional model, diffusion model, or other procedure which is adequate and appropriate. The plan shall contain a summary of the computations, assumptions and judgments used to determine the emissions reductions that will result from application of the control strategy to each point source, and each group of area sources. Such summary shall be included in a table similar to that presented in appendix D to this part. The plan also shall contain a sum
mary of the data, computations, assumptions and judgments used to develop any transportation control measures that are a part of the control strategy. Such a summary shall as a minimum contain the material described in appendix M to this part. The detailed computations and data shall be retained by the State and made available for inspection by the Administrator at his request.
(6) If a diffusion/photochemical model is used, the plan shall include a description of such model.
(d) Emission data. Emission data on carbon monoxide, hydrocarbons, and nitrogen oxides shall be submitted in accordance with the requirements of $ 51.13(f).
(e) Air quality data. Data showing existing air quality levels shall be presented in accordance with this section:
(1) For Priority I regions, data on carbon monoxide, nitrogen dioxide, and photochemical oxidants shall, as a minimum, include the results of measurements made during a period of approximately 3 months beginning on or about July 1, 1971, in accordance with the following procedures.
1 Equivalent methods are specified In $ 420.17.
(2) For Priority I regions, only available air quality data for hydrocarbons must be submitted.
(3) For Priority III regions, no air quality data for carbon monoxide, hydrocarbons, nitrogen dioxide, and photochemical oxidants need be submitted.
(4) Air quality data required by this subparagraph shall be submitted in the form similar to that shown in Appendix H to this part.
(f) Motor vehicle emission factors.The States required to submit transportation control plans must, except as noted below, use current emission factors and methodology to calculate emissions from gasoline powered motor vehicles. The current emission factors and methodology are presented in "Compila
tion of Air Pollutant Emission Factors," EPA Report No. AP-42, and in superseding EPA interim reports. These are available from the EPA, Office of Air Quality Planning and Standards, Research Triangle Park, N.C. 27711. If emissions factors or methodology other than those presented in the EPA report are used, the substantiating justification must be submitted with the transportation control measures.
(g) Air quality base line.-The concentrations of carbon monoxide and photochemical oxidants set forth in the State plan as approved and promulgated on May 31, 1972 (37 FR 10842), (part 52 of this chapter), may be used as the air quality base lines for computation of the emissions reductions through transportation control measures required to meet national standards. More recent air quality data should be used where adequate and appropriate. Such data must be compatible with the emissions inventory for the region involved and justification submitted for the appropriateness of its use. Revised air quality data should be submitted to the appropriate EPA regional office at the earliest possible date for evaluation and approval to preclude plan disapproval resulting from the use of faulty air quality data.
(h) Transportation control strategies.-Information and requirements for States which are considering transportation control measures involving inspection, maintenance, and retrofit of in-use motor vehicles are presented in appendix N to this part. (36 FR 22398, Nov. 15, 1971, as amended at 36 FR 25233, Dec. 30, 1971; 38 FR 15195, June 8, 1973) $ 51.15 Compliance schedules.
(a) (1) Each plan shall contain legally enforceable compliance schedules setting forth the dates by which all stationary and mobile sources or categories of such sources must be in compliance with any applicable requirement of the plan. Such compliance schedules shall contain increments of progress required by paragraph (c) of this section.
(2) A plan may provide that compliance schedules for individual sources or categories of sources will be formulated following submittal of the plan. Such compliance schedules shall be submitted to the Administrator within 60 days following the date such schedule is adopted but in no case later than the prescribed date for submittal of the first semiannual report required by $ 51.7: Provided, however, That compliance schedules for nitrogen oxides required for stationary source shall be submitted to the Administrator no later than the prescribed date for the submittal of the second semiannual report required by $ 51.7. Where submission of compliance schedules is deferred by a State under this subparagraph, the an shall specify a final ompliance date applicable to each source subject to an applicable requirement of the plan. Compliance schedules submitted pursuant to this subparagraph shall require each source or category of sources to comply with such requirement
within the times specified in paragraph (b) of this section but in no event later than the date specified in the plan for final compliance with such requirement.
(b) (1) Any compliance schedule designed to provide for attainment of a primary standard shall provide for compliance with the applicable plan requirements as expeditiously as practicable and in no case, except as provided by Subpart C of this part, later than the date specified for attainment of such primary standard pursuant to $ 51.10(b).
(2) Any compliance schedule designed to provide for attainment of a secondary standard shall provide for compliance with the applicable plan requirements in a reasonable time and in no case, except as provided by Subpart of this part, later than the date specified for the attainment of such secondary standard pursuant to $ 51.10(c).
(c) Any compliance schedule or revision thereof extending over a period of more than 1 year from the date of its adoption by the State agency shall provide for legally enforceable increments of progress toward compliance by each affected source or category of sources: Provided however: That increments of progress shall not be required for a compliance schedule which does not extend beyond January 31, 1974. Increments of progress shall include, where practicable, each increment of progress specified in $ 51.1(q) and shall include such additional increments of progress as may be necessary to permit close and effective supervision of progress toward timely compliance. (37 FR 26312, Dec. 9, 1972) $ 51.16 Prevention of air pollution
emergency episodes. (a) For the purpose of preventing air pollution emergency episodes, each plan for a Priority 1 region shall include a contingency plan which shall, as a minimum, provide for taking any emission control actions necessary to prevent ambient pollutant concentrations at any location in such region from reaching levels which could cause significant harm to the health of persons, which levels are as follows: Sulfur dioxide-2,620 micrograms/cubic me
ter (1.0 part per million), 24-hour average. Particulate matter-1,000 micrograms/cubic
meter or 8 COH's, 24-hour average.
Sulfur dioxide and particulate matter com
bined-product of sulfur dioxide in micrograms/cubic meter, 24-hour average, and particulate matter in micrograms/cubic meter, 24-hour average, equal to 490 X 108 or product of sulfur dioxide in parts per million, 24-hour average and COH's, 24
hour average, equal to 1.5. Carbon monoxide: 57.5 milligrams/cubic meter (50 parts per
million), 8-hour average. 86.3 milligrams/cubic meter (75 parts per
million), 4-hour average. 144 milligrams/cubic meter (125 parts per
million), 1-hour average. Photochemical oxidants: 800 micrograms/cubic meter (0.4 part per
million), 4-hour average. 1,200 micrograms/cubic meter (0.6 part per
million), 2-hour average. 1,400 micrograms/cubic meter (0.7 part per
million), 1-hour average. Nitrogen dioxide: 3,750 micrograms/cubic meter (2.0 parts
per million), 1-hour average. 938 micrograms/cubic meter (0.5 part per
million), 24-hour average. (b) Each contingency plan shall (1) specify two or more stages of episode criteria such as those set forth in Appendix L to this part, or their equivalent (2) provide for public announcement whenever any episode stage has been determined to exist, and (3) specify emission control actions to be taken at each episode stage, including, but not necessarily limited to, actions such as those set forth in Appendix L to this part, or their equivalent.
(c) (1) For each stationary source emitting 100 tons (90.7 metric tons) per year or more, the contingency plan shall include, or provide for preparation of, a specific legally enforceable emission control action program and shall show that the owner and/or operator of such stationary source has been notified of the requirements of such emission control action program.
(2) Any emission control action programs required by subparagraph (1) of this paragraph which are not included in the contingency plan shall be submitted to the Administrator in the first semiannual report required under $ 51.7. Unless disapproved by the Administrator, such emission control action programs shall be part of the applicable plan.
(d) To the maximum extent practicable, emission control actions taken
pursuant to a contingency plan shall be consistent with the extent of any air pollution episode, e.g., if a single source is determined to be responsible for the occurrence of any episode stage, then the emission control action steps applicable to such source shall be taken.
(e) Each contingency plan for a Priority I region shall provide for:
(1) Daily acquisition of forecasts of atmospheric stagnation conditions or during any episode stage and updating of such forecasts at least every 12 hours.
(2) Inspection of sources to ascertain compliance with applicable emission control action requirements.
(3) Communications procedures for transmitting status reports and orders as to emission control actions to be taken during an episode stage, including procedures for contact with public officials, major emission sources, public health, safety, and emergency agencies and news media.
(f) In the event that the requirements of paragraphs (c) and (e) of this section have not been fully met by the prescribed date for submitting a plan, & description of the steps under consideration and a timetable for their completion shall be submitted with the plan. Such timetable shall provide for meeting all requirements of paragraphs (c) and (e) of this section within 1 year after such prescribed date. A description of interim actions that will be taken to control emissions during any episode stage which occurs during such 1-year period shall be included.
(g) Each plan for a Priority II region shall include a contingency plan meeting, as a minmum, the requirements of subparagraphs (1) and (2) or paragraph (b) of this section. 136 F.R. 22398, Nov. 25, 1971; 36 F.R. 24002, Dec. 17, 1971) $ 51.17 Air quality surveillance.
(a) (1) The plan shall provide for the establishment of an air quality surveillance system which shall be completed and in operation as expeditiously as practicable, but not later than 2 years after the date of the Administrator's approval of the plan, and which shall meet, as a minimum, the following requirements:
Minimum frequency of sampling
Minimum number of air quality monitoring sites b
Suspended particulates. High volume sampler. One 24-hour sample every 6 days . Less than 100,000.
Ono sample every 2 hours........
Less than 100,000.
Less than 100,000.
Less than 100,000.
Above 5,000,000.. Nitrogen dioxide. 24-hour sampling method One 24-hour sample every 14 Less than 100,000. (Jacobs-Hochheiser days (gas bubbler).
4+0.6 per 100,000 population..
to eight sites.
• Equivalent to 61 random samples per year.
instrument system in parts exposed
quantities are removed), (3) Coulometric Detection (provided oxidizing and reducing interferences such as 03, NO2, and H2S are removed), and (4) the automated Pararosaniline Procedure.
• Equivalent method is Gas Chromatographic Separation-Catalytic Conversion-Flame Ionization Detection.
Equivalent methods are (1) Potassium Iodide Colorimetric Detection (provided a correction is made for SO, and NO2), (2) UV Photometric Detection of Ozone
It is assumed that the Federal motor vehicle emission standards will achieve and maintain the national standards for carbon monoxide, nitrogen dioxide, and
All named measurement methods, except the Tape Sampler method, are described in the national ambient air quality standards published April 30, 1971 (36 F.K 8186).
methods, including, but not necessarily limited to, those specified under footnotes (d), (e) and (D), will be considered equivalent if they meet the definition of “Equivalent
One sample every 2 hours..
h In interstate regions, the number of sites required should be prorated to each State on a population basis.
0-2,620 mg./m.: (0-1 p.p.m.). 0-58 mg./m.: (0-50 p.p.m.).
0-880 ug./m.: (0-0.5 p.p.m.). 26 ug./m.8 (0.01 p.p.m.). 0.6 mg./m.3 (0.5 p.p.m.).
20 wg./m.: (0.01 p.p.m.). 5 minutes. 5 minutes,
5 minutes. 5 minutes. 5 minutes.
5 minutes. #1 percent per day and +2 percent por +1 percent per day and +2 percent per +1 percent per day and +2 percent per 3 days. 3 days.
3 days. +1 percent per day and +2 percent per #1 percent per day and +2 percent per +1 percent per day and +2 percent per 3 days. 3 days.
+0.5 percent (full scale).
20 ug./m.: (0.01 p.p.m.).
2 percent (full scale).
Range. 0-1880 ug/m3 (0-1 p.p.m.).
0-3 mg/m3 (0-5 p.p.m.). Minimum detectable sensitivity. 19 mg/m3 (0.01 p.p.m.)...
0.13 mg/m3 (0.20 p.p.m.).
+1% per day and +2% per 3 days +1% per day and £2% per 3 days
+1% per day and +2% per 3 days +1% per day and +2% per 3 days
(full scale). Precision.. +4%
+0.5% (full scale).
0.03 mg/m3 (0.05 p.p.m.).
2% (full scale).
The various specifications are defined as follows:
Precision: The degree of agreement between repeated measurements of the same concentration (which shall be the midpoint of the stated range) expressed as the
Operation period: The period of time over which the instrument can be expected to operate unattended within specifications.
Linearity: The maximum deviation between an actual instrument reading and the reading predicted by a straight line drawn between upper and lower calibration points.