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requirements of such emission control atmospheric stagnation conditions or and (e) of this section within 1 year action program.

during any episode stage and updating after such prescribed date. A descrip-
(2) Any emission control action pro- of such forecasts at least every 12 tion of interim actions that will be taken
grams required by subparagraph (1) of hours.

to control emissions during any episode
this paragraph which are not included in (2) Inspection of sources to ascertain stage which occurs during such 1-year
the contingency plan shall be submitted compliance with applicable emission period shall be included.
to the Administrator in the first semi control action requirements.

(g) Each plan for a Priority II re-
annual report required under $ 51.7. (3) Communications procedures for gion shall include a contingency plan
Unless disapproved by the Administra transmitting status reports and orders meeting, as a minmum, the require-
tor, such emission control action pro- as to emission control actions to be taken ments of subparagraphs (1) and (2)
grams shall be part of the applicable during an episode stage, including pro- or paragraph (b) of this section.
plan.

cedures for contact with public officials, [36 F.R. 22398, Nov. 25, 1971; 36 F.R. 24002,
(d) To the maximum extent practi- major emission sources, public health, Dec. 17, 1971)
cable, emission control actions taken safety, and emergency agencies and
pursuant to a contingency plan shall be news media.

8 51.17 Air quality surveillance.
consistent with the extent of any air pol (f) In the event that the requirements (a) (1) The plan shall provide for the
lution episode, e.g., if a single source is of paragraphs (c) and (e) of this sec- establishment of an air quality sur-
determined to be responsible for the oc- tion have not been fully met by the pre- veillance system which shall be com-
currence of any episode stage, then the scribed date for submitting a plan, a pleted and in operation as expeditiously
emission control action steps applicable description of the steps under considera- as practicable, but not later than 2 years
to such source shall be taken.

tion and a timetable for their comple- after the date of the Administrator's ap-
(e) Each contingency plan for a Pri- tion shall be submitted with the plan. proval of the plan, and which shall meet,
ority I region shall provide for:

Such timetable shall provide for meet- as a minimum, the following require-
(1) Daily acquisition of forecasts of ing all requirements of paragraphs (c) ments:

Pollutant

Classification

of region

Measurement method i

Minimum frequency of sampling

Region population

Minimum number of air quality monitoring sites h

I.... ---------- Suspended particulates... High volume sampler...---... One 24-hour sample every 6 days . Less than 100,000..

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

Above 5,000,000..
Tape sampler....

One sample overy 2 hours....
Sulfur dioxide.... .. Pararosanilinə or equivalent d. One 24-hour sample every 6 days Less than 100.000.-

(gas bubbler). a

100,000–1,000,000..
1,000,001-5,000,000.

Above 5,000,000.
Continuous....

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

Above 5,000,000. Carbon monoxide......... Nondispersive Infrared or Continuous..

Less than 100,000.equivalent.

100,000-5,000,000.Above 5,000,000 --

4+0.6 per 100,000 population.c
- 7.5+0.25 per 100,000 population.co
- 12+0.16 per 100,000 population.
One per 250,000 population cup

to eight sites.
2.5+0.5 per 100,000 population,
6+0.15 per 100,000 population.ao
11+0.05 per 100,000 population.
1.
1+0.15 per 100,000 population.

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

1+0.16 per 100,000 population.. 6+0.05 per 100,000 population..

.

...

ats... Gas egare altennilumin

-- 1.

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

3.
4+0.6 per 100,000 population..

Photochemical oxidants... Gas phase chemiluminesence Continuous....

Less than 100,000. or equivalent.

100,000-5,000,000..--

Above 5,000,000.---.
Nitrogen dioxido...-..-... 24-hour sampling method One 24-hour sample every 14 Less than 100,000...
(Jacobs-Hochheiser
days (gas bubbler).b

100,000-1,000,000..
method).

Above 1,000,000...
II............. Suspended particulates... High volume sampler...-.--. Ona 24-hour sample every 6 days a..

Tape sampler....

One sample every 2 hours....
Sulfur dioxide............. Pararosaniline or equivalent d. One 24-hour sample every 6 days

(gas bubbler).

Continuous......
III..

Suspended particulates... High volume sampler. ------- One 24-hour sample every 6 days a ..
Sulfur dioxide.......... Pararosaniline or equivalent d. One 24-hour sample every 6 days

(gas bubbler).

........................

1.

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| Equivalent methods are (1) Potassium Iodide Colorimetric Detection (provided a correction is made for SO2 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.

i All named measurement methods, except the Tape Sampler method, are described in the national ambient air quality standards published April 30, 19 1 (36 F.R. 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:

a Equivalent to 61 random samples per year.
b Equivalent to 26 random samples per year.
c Total population of a region. When required number of samplers includes a fraction, round-off to nearest whole number.

d Equivalent methods ara (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 raducing interferences such as 03, NO2, and H2S are removed), and (4) the automated Pararosaniline Procedure.

e Equivalent method is Gas Chromatographic Separation-Catalytic Conversion-Flame Ionization Detection.

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

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Range...

0-2,620 ug./m.3 (0-1 p.p.m.)----- -- 0-58 mg./m.3 (0-50 p.p.m.)....

0-880 ug./m.3 (0-0.5 p.p.m.). Minimum detectable sensitivity..

26 wg./m.3 (0.01 p.p.m.)....
0.6 mg./m.3 (0.5 p.p.m.).....

20 mg./m.3 (0.01 p.p.m.).
Rise time, 90 percent.---..

5 minutes.--------
- 5 minutes....

... 5 minutes.
Fall time, 90 percent...

5 minutes....
- 5 minutes..--

5 minutes.
Zero drift ------

+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.

3 days.
Span drift......

+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.

3 days.
Precision...

+2 percent...
+4 percent.

+4 percent.
Operation period......
. 3 days..
. 3 days. ------

.. 3 days.
Noise. ---

+0.5 percent (full scale)..
+0.5 percent (full scale)

+0.5 percent (full scale). Interference equivalent... .. 26 ug./m.3 (0.01 p.p.m.)--

1.1 mg./m.3 (1 p.p.m.)...

20 mg./m.3 (0.01 p.p.m.). Operating temperature fluctuation.--- +5° C...

+5°C..

#5° C. 2 Percent (full scale) --

2 percent (full scale) Linearity.------

2 percent (full scale).

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The various specifications are defined as follows:
Range: The minimum and maximum measurement limits.
Minimum detectable sensitivity: The smallest amount of input concentration which can be detected as concentration approaches zero.
Rise time 90 percent: The interval between initial response time and time to 90 percent response after a step increase in inlet concentration.
Fall time 90 percent: The interval between initial response time and time to 90 percent response after a step decrease in the inlet concentration.
Zero drift: The change in instrument output over a stated time period of unadjusted continuous operation, when the input concentration is zero.
Span drift: The change in instrument output over a stated period of unadjusted continuous operation, when the input concentration is a stated upscale value.

Precision: The degree of agreement between repeated measurements of the same concentration (which shall be the midpoint of the stated range) expressed as the
average deviation of the single results from the mean.

Operation period: The period of time over which the instrument can be expected to operate unattended within specifications.
Noise: Spontaneous deviations from a mean output not caused by input concentration changes.
Interference equivalent: The portion of indicated concentration due to the total of the interferences commonly found in ambient air.
Operating temperature fluctuation: The ambient temperature fluctuation over which stated specifications will be met.

Linearity: The maximum deviation between an actual instrument reading and the reading predicted by a straight line drawn between upper and lower calibration
points.

(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 that will be used to implement the authority described in $ 51.11(a) (4), which procedures shall be adequate to enable the State to determine whether construction or modification of stationary sources will result in violations of applicable portions of the control strategy or will interfere with attainment or maintenance of a national standard.

(b) Such procedures shall provide for the submission, by the owner or operator of a new stationary source, or existing source which is to be modified, of such information on the nature and amounts of emissions, locations, design, construction, and operation of such sources as may be necessary to permit the State agency to make the determination referred to in paragraph (a) of this section.

(c) Such procedures shall also include means of disapproving such construction or modification if it will result in a viola

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

(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. 136 F.R. 23398, Nov. 25, 1971, as amended at 36 F.R. 25233, Dec. 30, 1971) $ 51.19 Source surveillance.

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. $ 51.20 Resources.

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 responsibil

ity 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 responsibility in the same or other States, information on factors (e.g., construction of new industrial plants) which may significantly affect air quality in any portion of such region or in any adjoining region. $ 51.22 Rules and regulations.

Emission limitations and other measures necessary for attainment and maintenance of any national standard, including any measures necessary to implement the requirements of $ 51.11, shall be adopted as rules and regulations enforceable by the State agency. Copies of all such rules and regulations shall be submitted with the plan. Except as otherwise provided by $ 51.11(b), submittal of a plan setting forth proposed rules and regulations will not satisfy the requirements of this section nor will it be considered a timely submittal.

Subpart C-Extensions $ 51.30 Request for 2-year extension.

(a) The Governor of a State may, at the time of submission of a plan to implement a primary standard in a Priority I region, request the Administrator to extend, for a period not exceeding 2 years, the 3-year period prescribed by the Act for attainment of the primary standard in such region.

(b) Any such request regarding an interstate region shall be submitted jointis with the requests of Governors of all States in the region, or shall show that the Governor of each State in the region has been notified of such a request.

c) Any such request regarding attainment of a primary standard shall be subcritted together with a plan which shali:

(1) Set forth a control strategy adequate for attainment of such primary standard.

(2) Show that the necessary technology or alternatives will not be available soon enough to permit full implementation of such control strategy within such 3-year period, i.e., one or more emission sources or classes of sources will be unable to comply with applicable portions of the control strategy.

(3) Provide for attainment of such primary standard as expeditiously as practicable, but in no case later than 5 years after the date of the Administrator's approval of such plan.

(d) Any showing pursuant to paragraph (c) of this section shall include:

(1) A clear identification of stationary emission sources or classes of moving sources which will be unable to comply with the applicable portions of such control strategy within a 3-year period because the necessary technology or alternatives will not be available soon enough to permit such compliance.

(2) A clear identification and justification of any assumptions made with the respect to the time at which the necessary technology or alternatives wil available.

(3) A clear identification of any alternative means of attainment of such primary standard which were considered and rejected.

(4) A showing that stationary emission sources or classes of moving sources other than those identified pursuant to subparagraph (1) of this paragraph will be required to comply, within such 3year period, with any applicable portions of such control strategy.

(5) A showing that reasonable interim control measures are provided for in such plan with respect to emissions from the source(s) identified pursuant to subparagraph (1) of this paragraph. $ 51.31 Request for 18-month exten.

sion. (a) Upon request of the State made in accordance with this section, the Administrator may, whenever he determines necessary, extend, for a period not to exceed 18 months, the deadline for submitting that portion of a plan that implements a secondary standard.

(b) Any such request will be given consideration oniy in the case of Priority I and Priority II regions.

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