[Code of Federal Regulations]
[Title 40, Volume 8]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR61.55]

[Page 44-46]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 61--NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS--Table of Contents
 
            Subpart E--National Emission Standard for Mercury
 
Sec. 61.55  Monitoring of emissions and operations.

    (a) Wastewater treatment plant sludge incineration and drying 
plants. All the sources for which mercury emissions exceed 1.6 kg (3.5 
lb) per 24-hour period, demonstrated either by stack sampling according 
to Sec. 61.53 or sludge sampling according to Sec. 61.54, shall monitor 
mercury emissions at intervals of at least once per year by use of 
Method 105 of

[[Page 45]]

appendix B or the procedures specified in Sec. 61.53 (d) (2) and (4). 
The results of monitoring shall be reported and retained according to 
Sec. 61.53(d) (5) and (6) or Sec. 61.54 (f) and (g).
    (b) Mercury cell chlor-alkali plants--hydrogen and end-box 
ventilation gas streams. (1) The owner or operator of each mercury cell 
chlor-alkali plant shall, within 1 year of the date of publication of 
these amendments or within 1 year of startup for a plant with initial 
startup after the date of publication, perform a mercury emission test 
that demonstrates compliance with the emission limits in Sec. 61.52, on 
the hydrogen stream by Method 102 and on the end-box stream by Method 
101 for the purpose of establishing limits for parameters to be 
monitored.
    (2) During tests specified in paragraph (b)(1) of this section, the 
following control device parameters shall be monitored, except as 
provided in paragraph (c) of this section, and recorded manually or 
automatically at least once every 15 minutes:
    (i) The exit gas temperature from uncontrolled streams;
    (ii) The outlet temperature of the gas stream for the final (i.e., 
the farthest downstream) cooling system when no control devices other 
than coolers and demisters are used;
    (iii) The outlet temperature of the gas stream from the final 
cooling system when the cooling system is followed by a molecular sieve 
or carbon adsorber;
    (iv) Outlet concentration of available chlorine, pH, liquid flow 
rate, and inlet gas temperature of chlorinated brine scrubbers and 
hypochlorite scrubbers;
    (v) The liquid flow rate and exit gas temperature for water 
scrubbers;
    (vi) The inlet gas temperature of carbon adsorption systems; and
    (vii) The temperature during the heating phase of the regeneration 
cycle for carbon adsorbers or molecular sieves.
    (3) The recorded parameters in paragraphs (b)(2)(i) through 
(b)(2)(vi) of this section shall be averaged over the test period (a 
minimum of 6 hours) to provide an average number. The highest 
temperature reading that is measured in paragraph (b)(2)(vii) of this 
section is to be identified as the reference temperature for use in 
paragraph (b)(6)(ii) of this section.
    (4)(i) Immediately following completion of the emission tests 
specified in paragraph (b)(1) of this section, the owner or operator of 
a mercury cell chlor-alkali plant shall monitor and record manually or 
automatically at least once per hour the same parameters specified in 
paragraphs (b)(2)(i) through (b)(2)(vi) of this section.
    (ii) Immediately following completion of the emission tests 
specified in paragraph (b)(1) of this section, the owner or operator 
shall monitor and record manually or automatically, during each heating 
phase of the regeneration cycle, the temperature specified in paragraph 
(b)(2)(vii) of this section.
    (5) Monitoring devices used in accordance with paragraphs (b)(2) and 
(b)(4) of this section shall be certified by their manufacturer to be 
accurate to within 10 percent, and shall be operated, maintained, and 
calibrated according to the manufacturer's instructions. Records of the 
certifications and calibrations shall be retained at the chlor-alkali 
plant and made available for inspection by the Administrator as follows: 
Certification, for as long as the device is used for this purpose; 
calibration for a minimum of 2 years.
    (6)(i) When the hourly value of a parameter monitored in accordance 
with paragraph (b)(4)(i) of this section exceeds, or in the case of 
liquid flow rate and available chlorine falls below the value of that 
same parameter determined in paragraph (b)(2) of this section for 24 
consecutive hours, the Administrator is to be notified within the next 
10 days.
    (ii) When the maximum hourly value of the temperature measured in 
accordance with paragraph (b)(4)(ii) of this section is below the 
reference temperature recorded according to paragraph (b)(3) of this 
section for three consecutive regeneration cycles, the Administrator is 
to be notified within the next 10 days.
    (7) Semiannual reports shall be submitted to the Administrator 
indicating the time and date on which the hourly value of each parameter 
monitored according to paragraphs (b)(4)(i) and (b)(4)(ii) of this 
section fell outside the

[[Page 46]]

value of that same parameter determined under paragraph (b)(3) of this 
section; and corrective action taken, and the time and date of the 
corrective action. Parameter excursions will be considered unacceptable 
operation and maintenance of the emission control system. In addition, 
while compliance with the emission limits is determined primarily by 
conducting a performance test according to the procedures in 
Sec. 61.53(b), reports of parameter excursions may be used as evidence 
in judging the duration of a violation that is determined by a 
performance test.
    (8) Semiannual reports required in paragraph (b)(7) of this section 
shall be submitted to the Administrator on September 15 and March 15 of 
each year. The first semiannual report is to be submitted following the 
first full 6 month reporting period. The semiannual report due on 
September 15 (March 15) shall include all excursions monitored through 
August 31 (February 28) of the same calendar year.
    (c) As an alternative to the monitoring, recordkeeping, and 
reporting requirements in paragraphs (b)(2) through (8) of this section, 
an owner or operator may develop and submit for the Administrator's 
review and approval a plant-specific monitoring plan. To be approved, 
such a plan must ensure not only compliance with the emission limits of 
Sec. 61.52(a) but also proper operation and maintenance of emissions 
control systems. Any site-specific monitoring plan submitted must, at a 
minimum, include the following:
    (1) Identification of the critical parameter or parameters for the 
hydrogen stream and for the end-box ventilation stream that are to be 
monitored and an explanation of why the critical parameter(s) selected 
is the best indicator of proper control system performance and of 
mercury emission rates.
    (2) Identification of the maximum or minimum value of each parameter 
(e.g., degrees temperature, concentration of mercury) that is not to be 
exceeded. The level(s) is to be directly correlated to the results of a 
performance test, conducted no more than 180 days prior to submittal of 
the plan, when the facility was in compliance with the emission limits 
of Sec. 61.52(a).
    (3) Designation of the frequency for recording the parameter 
measurements, with justification if the frequency is less than hourly. A 
longer recording frequency must be justified on the basis of the amount 
of time that could elapse during periods of process or control system 
upsets before the emission limits would be exceeded, and consideration 
is to be given to the time that would be necessary to repair the 
failure.
    (4) Designation of the immediate actions to be taken in the event of 
an excursion beyond the value of the parameter established in paragraph 
(c)(2) of this section.
    (5) Provisions for reporting, semiannually, parameter excursions and 
the corrective actions taken, and provisions for reporting within 10 
days any significant excursion.
    (6) Identification of the accuracy of the monitoring device(s) or of 
the readings obtained.
    (7) Recordkeeping requirements for certifications and calibrations.
    (d) Mercury cell chlor-alkali plants--cell room ventilation system. 
(1) Stationary sources determining cell room emissions in accordance 
with Sec. 61.53(c)(4) shall maintain daily records of all leaks or 
spills of mercury. The records shall indicate the amount, location, 
time, and date the leaks or spills occurred, identify the cause of the 
leak or spill, state the immediate steps taken to minimize mercury 
emissions and steps taken to prevent future occurrences, and provide the 
time and date on which corrective steps were taken.
    (2) The results of monitoring shall be recorded, retained at the 
source, and made available for inspection by the Administrator for a 
minimum of 2 years.

[52 FR 8727, Mar. 19, 1987, as amended at 65 FR 62151, Oct. 17, 2000]