tion 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 plan shall specify a final compliance 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 C 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 meter (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 combined-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 103 or product of sulfur dioxide in parts per million, 24-hour average and COH's, 24hour 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, a 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.

[36 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:

Sulfur dioxide.

One sample every 2 hours.

Pararosaniline or equivalent d. One 24-hour sample every 6 days

Photochemical oxidants... Gas phase chemiluminesence

(gas bubbler).

Continuous.

Carbon monoxide....

Nondispersive infrared or equivalent.

Nitrogen dioxide..

or equivalent.! 24-hour sampling method (Jacobs-Hochheiser

One 24-hour sample every 14 days (gas bubbler).

method).

Suspended particulates... High volume sampler..

Tape sampler...

Sulfur dioxide..

III a

Equivalent to 61 random samples per year.

One 24-hour sample every 6 days.
One sample every 2 hours..

Pararosaniline or equivalent d. One 24-hour sample every 6 days

100,000-1,000,000.1,000,001-5,000,000. Above 5,000,000..

Less than 100,000. 100,000-1,000,000.. 1,000,001-5,000,000Above 5,000,000.Less than 100,000.. 100,000-5,000,000.. Above 5,000,000.. Less than 100,000. 100,000-5,000,000.. Above 5,000,000Less than 100,000.. 100,000-5,000,000. Above 5,000,000.. Less than 100,000. 100,000-1,000,000.. Above 1,000,000..

Equivalent to 26 random samples per year.

Total population of a region. When required number of samplers includes a fraction, round-off to nearest whole number.

Equivalent methods are (1) Gas Chromatographic Separation-Flame Photometric Datcction (provided Teflon is used throughout the instrument system in parts exposed
oxidizing and reducing interferences such as O3, NO, and H2S are removed), and (4) the automated Pararosanilina Procedure.
to the air stream), (2) Flame Photometric Detection (provided interfering sulfur compounds present in significant quantities are removed), (3) Coulometric Detection (provided
Equivalent method is Gas Chromatographic Separation-Catalytic Conversion-Flame Ionization Detection.

(provided compensation is made for interfering substances), and (3) Chemiluminesence Methods differing from that of the reference method.
Equivalent methods are (1) Potassium Iodide Colorimetric Detection (provided a correction is made for SO2 and NO2), (2) UV Photometric Detection of Ozone
photochemical oxidants; therefore, no monitoring sites are required for these pollutants.
It is assumed that the Federal motor vehicle emission standards will achieve and maintain the national standards for carbon monoxide, nitrogen dioxide, and

h In interstate regions, the number of sites required should be prorated to each State on a population basis.

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).
Method" set forth in such national ambient air quality standards and if they meet the following performance specifications:
Other methods, including, but not necessarily limited to, those specified under footnotes (d), (e), and (f), will be considered equivalent if they meet the definition of "Equivalent

(2) At least one sampling site must be located in the area of estimated maximum pollutant concentrations.

(b) The plan shall include a description of the existing and proposed air quality surveillance system, which shall set forth:

(1) The basis for the design of the surveillance system, selection of samplers, and sampling sites.

(2) The locations of the samplers by Universal Transverse Mercator (UTM) grid coordinates or the equivalent. Any EPA monitoring station may be designated as a sampler location.

(3) The sampling schedules.

(4) The methods of sampling and analysis.

(5) The method of data handling and analysis procedures.

(6) The timetable for the installation of any additional equipment needed to complete the system.

(c) The plan shall provide for monitoring of air quality during any air pollution emergency episode stage. The stations selected for use during such periods must be in operation within 1 year after the date of the Administrator's approval of the plan and be capable of indicating when pollutant concentrations have reached, or are approaching, any episode criteria established pursuant to § 51.16.

[36 F.R. 22398, Nov. 25, 1971, as amended at 36 F.R. 25233, Dec. 30, 1971]

§ 51.18

Review of new sources and modifications.

(a) Each plan shall set forth legally enforceable procedures which shall be adequate to enable the State or a local agency to determine whether the construction or modification of a facility, building, structure, or installation, or combination thereof, will result in violations of applicable portions of the control strategy or will interfere with attainment or maintenance of a national standard either directly because of emissions from it, or indirectly, because of emissions resulting from mobile source activities associated with it.

(b) Such procedures shall include means by which the State or local agency responsible for final decisionmaking on an application for approval to construct or modify will prevent such construction or modification if it will result in a viola

tion of applicable portions of the control strategy or will interfere with the attainment or maintenance of a national standard.

(c) Such procedures shall provide for the submission, by the owner or operator of the building, facility, structure, or installation to be constructed or modified, of such information on:

(1) The nature and amounts of emissions to be emitted by it or emitted by associated mobile sources;

(2) The location, design, construction, and operation of such facility, building, structure, or installation as may be necessary to permit the State or local agency to make the determination referred to in paragraph (a) of this section.

(d) Such procedures shall provide that approval of any construction or modification shall not affect the responsibility of the owner or operator to comply with applicable portions of the control strategy.

(e) Each plan shall identify the State or local agency which will be responsible for meeting the requirements of this section in each area of the State. Where such responsibility rests with an agency other than an air pollution control agency, such agency shall consult with the appropriate State or local air pollution control agency in carrying out the provisions of this section.

(f) Such procedures shall identify types and sizes of facilities, buildings, structures, or installations which will be subject to review pursuant to this section. The plan shall discuss the basis for determining which facilities shall be subject to review.

(g) The plan shall include the administrative procedures, which will be followed in making the determination specified in paragraph (a) of this section.

(h) (1) Such procedures shall provide that prior to approving or disapproving the construction or modification of a facility, building, structure, or installation pursuant to this section, the State or local agency will provide opportunity for public comment on the information submitted by the owner or operator and on the agency's analysis of the effect of such construction or modification on ambient air quality, including the agency's proposed approval or disapproval.