[Code of Federal Regulations]
[Title 40, Volume 8]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR61.183]

[Page 142-143]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 61_NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS
--Table of Contents
 
  Subpart P_National Emission Standard for Inorganic Arsenic Emissions 
    From Arsenic Trioxide and Metallic Arsenic Production Facilities
 
Sec. 61.183  Emission monitoring.

    (a) The owner or operator of each source subject to the provisions 
of this subpart shall install, calibrate, maintain, and operate a 
continuous monitoring system for the measurement of the opacity of each 
arsenic trioxide and metallic arsenic process emission stream that exits 
from a control device.
    (b) The owner or operator shall install, operate, and maintain each 
continuous monitoring system for the measurement of opacity required in 
paragraph (a) of this section according to the following procedures:
    (1) Ensure that each system is installed and operational no later 
than 90 days after the effective date of this subpart for an existing 
source or a new source that has an initial startup date preceding the 
effective date. For a new source whose initial startup occurs after the 
effective date of this subpart, ensure that the system is installed and 
operational no later than 90 days after startup. Verification of the 
operational

[[Page 143]]

status shall, as a minimum, consist of an evaluation of the monitoring 
system in accordance with the requirements and procedures contained in 
Performance Specification 1 of appendix B of 40 CFR part 60.
    (2) Comply with the provisions of Sec. 60.13(d) of 40 CFR part 60.
    (3) Except for system breakdowns, repairs, calibration checks, and 
zero and span adjustments required under Sec. 60.13(d), ensure that 
each continuous monitoring system is in continuous operation and meets 
frequency of operation requirements by completing a minimum of one cycle 
of sampling and analysis for each successive 10-second period and one 
cycle of data recording for each successive 6-minute period. Each data 
point shall represent the opacity measured for one cycle of sampling and 
analysis and shall be expressed as percent opacity.
    (c) The owner or operator shall calculate 6-minute opacity averages 
from 36 or more consecutive data points equally spaced over each 6-
minute period. Data recorded during periods of monitoring system 
breakdowns, repairs, calibration checks, and zero and span adjustments 
shall not be included in the data averages computed under this 
paragraph.
    (d) No later than 60 days after each continuous opacity monitoring 
system required in paragraph (a) of this section becomes operational, 
the owner or operator shall establish a reference opacity level for each 
monitored emission stream according to the following procedures:
    (1) Conduct continuous opacity monitoring over a preplanned period 
of not less than 36 hours during which the processes and emission 
control equipment upstream of the monitoring system are operating in a 
manner that will minimize opacity under representative operating 
conditions subject to the Administrator's approval.
    (2) Calculate 6-minute averages of the opacity readings using 36 or 
more consecutive data points equally spaced over each 6-minute period.
    (3) Establish the reference opacity level by determining the highest 
6-minute average opacity calculated under paragraph (d)(2) of this 
section.
    (e) With a minimum of 30 days prior notice, the Administrator may 
require an owner or operator to redetermine the reference opacity level 
for any monitored emission stream.
    (f) Each owner or operator shall install all continuous monitoring 
systems or monitoring devices required in paragraph (a) of this section 
in such a manner that representative measurements of emissions or 
process parameters are obtained.