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) [Reserved]

(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 paragraph (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 paragraph (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, as amended at 38 FR 20835, Aug. 3, 1973]

§ 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:

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

(gas bubbler).

Photochemical oxidants... Gas phase chemiluminesence

or equivalent.'

24-hour sampling method (Jacobs-Hochheiser

method).

High volume sampler.. Tape sampler..

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

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

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

(gas bubbler).

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

4.

4+0.6 per 100,000 population..
7.5+0.25 per 100,000 population.co
12+0.16 per 100,000 population.
One per 250,000 population up
to eight sites.

2.5+0.5 per 100,000 population..
6+0.15 per 100,000 population...
11+0.05 per 100,000 population.
1.

1+0.15 per 100,000 population.
6+0.05 per 100,000 population.
1.

1+0.15 per 100,000 population. 6+0.05 per 100,000 population..

1.

d Equivalent methods are (1) Gas Chromatographic Separation-Flame Photometric Detection (provided Teflon is used throughout the instrument system in parts exposed to the air stream), (2) Flame Photometric Detection (provided interfering sulfur compounds present in significant quantities are removed), (3) Coulometric Detection (provided oxidizing and reducing interferences such as O3, NO, 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
(provided compensation is made for interfering substances), and (3) Chemiluminesence Methods differing from that of the reference method.

It is assumed that the Federal motor vehicle emission standards will achieve and maintain the national standards for carbon monoxide, nitrogen dioxide, and
photochemical oxidants; therefore, no monitoring sites are required for these pollutants.

b 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).
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
Method" set forth in such national ambient air quality standards and if they meet the following performance specifications:

(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 violation of applicable portions of the control strategy or will interfere with the attain

ment 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

strategy.

portions of the control

(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 subIject 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.

(2) For purposes of paragraph (h) (1) of this section, opportunity for public comment shall include, as a minimum:

(i) Availability for public inspection in at least one location in the region af

fected of the information submitted by the owner or operator and of the State or local agency's analysis of the effect on air quality.

(ii) A 30-day period for submittal of public comment, and

(iii) A notice by prominent advertisement in the region affected of the location of the source information and analysis specified in paragraph (h) (2) (i) of this section.

(3) Where the 30-day comment period required in paragraph (h) of this section would conflict with existing requirements for acting on requests for permission to construct or modify, the State may submit for approval a comment period which is

consistent with such existing requirements.

(4) A copy of the notice required by paragraph (h) (2) of this section shall also be sent to the administrator through the appropriate regional office, and to all other State and local air pollution control agencies having jurisdiction in the region in which such new or modified installation will be located. The notice also shall be sent to any other agency in the region having responsibility for implementing the procedures required under this section.

(i) Suggestions for developing procedures to meet the requirements of this section are set forth in appendix 0. [38 FR 15836, June 18, 1973]

Each plan shall provide for monitoring the status of compliance with any rules and regulations which set forth any portion of the control strategy. Specifically, each plan shall, as a minimum, provide for:

(a) Legally enforceable procedures for requiring owners or operators of stationary sources to maintain records of, and periodically report to the State information on, the nature and amount of emissions from such stationary sources and/or such other information as may be necessary to enable the State to determine whether such sources are in compliance with applicable portions of the control strategy.

(b) Periodic testing and inspection of stationary sources.

(c) Establishment of a system for detecting violations of any rules and regulations through the enforcement of appropriate visible emission limitations and for investigating complaints.

(d) Procedures for obtaining and maintaining data on actual emissions reductions achieved as a result of implementing transportation control measures. In the case of measures involving inspection, maintenance, or retrofit, these data shall include the results of an emission surveillance program designed to determine actual average per vehicle emissions reductions attributable to inspection, maintenance, and/or retrofit. In the case of measures based on traffic flow changes or reductions in vehicle use, the data shall include observed changes in vehicle miles traveled (VMT) and average speeds. The data shall be maintained in such a way as to facilitate comparison of the planned and actual efficacy of the transportation control measures. [36 FR 22398, Nov. 25, 1971, as amended at 38 FR 15196, June 8, 1973]

Each plan shall include a description of the resources available to the State and local agencies at the date of submission of the plan and of any additional resources needed to carry out the plan during the 5-year period following its submission. Such description, which shall be provided in a form similar to that in Appendix K to this part, shall include projections of the extent to which resources will be acquired at 1-, 3-, and 5year intervals.

§ 51.21 Intergovernmental cooperation.

(a) For the purpose of assisting in the development of a plan for any interstate region, the State agency responsible for implementing national standards in any portion of such an interstate region shall furnish any available data on emissions, air quality, and control strategy development, upon request, to any other State or local agency having such responsibility in any other portion of such interstate region.

(b) Each plan shall identify:

(1) The local agencies, by official title, which will participate in carrying out the plan.

(2) The responsibilities of such local agencies and the responsibilities of any State governmental agency involved in carrying out any portion of the plan.

(c) Each plan shall provide assurances that the State agency having primary responsibility for implementing national standards in any region, or portion thereof, will promptly transmit to other State agencies having similar or related