[Code of Federal Regulations]
[Title 40, Volume 14]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR75.32]

[Page 263-264]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 75--CONTINUOUS EMISSION MONITORING--Table of Contents
 
             Subpart D--Missing Data Substitution Procedures
 
Sec. 75.32  Determination of monitor data availability for standard missing 
data procedures.

    (a) Following initial certification of the required SO2, 
CO2, O2 or moisture monitoring system(s) at a 
particular unit or stack location (i.e., the date and time at which 
quality-assured data begins to be recorded by CEMS(s) at that location), 
the owner or operator shall begin calculating the percent monitor data 
availability as described in paragraph (a)(1) of this section, and 
shall, upon completion of the first 720 quality-assured monitor 
operating hours, record, by means of the automated data acquisition and 
handling system, the percent monitor data availability for each 
monitored parameter. Similarly, following initial certification of the 
required NOX-diluent, NOX concentration, or flow 
monitoring system(s) at a unit or stack location, the owner or operator 
shall begin calculating the percent monitor data availability as 
described in paragraph (a)(1) of this section, and shall, upon 
completion of the first 2,160 quality-assured monitor operating hours, 
record, by means of the automated data acquisition and handling system, 
the percent monitor data availability for each monitored parameter. 
Notwithstanding these requirements, if three years (26,280 clock hours) 
have elapsed since the date and hour of initial certification and fewer 
than 720 (or 2,160, as applicable) quality-assured monitor operating 
hours have been recorded, the owner or operator shall begin recording 
the percent monitor data availability. The percent monitor data 
availability shall be calculated for each monitored parameter at each 
unit or stack location, as follows:
    (1) Prior to completion of 8,760 unit or stack operating hours 
following initial certification, the owner or operator shall, for the 
purpose of applying the standard missing data procedures of Sec. 75.33, 
use Equation 8 to calculate, hourly, percent monitor data availability.
[GRAPHIC] [TIFF OMITTED] TC13NO91.041

    (2) Upon completion of 8,760 unit (or stack) operating hours 
following initial certification and thereafter, the owner or operator 
shall, for the purpose of applying the standard missing data procedures 
of Sec. 75.33, use Equation 9 to calculate hourly, percent monitor data 
availability. Notwithstanding this requirement, if three years (26,280 
clock

[[Page 264]]

hours) have elapsed since initial certification and fewer than 8,760 
unit or stack operating hours have been accumulated, the owner or 
operator shall begin using a modified version of Equation 9, as 
described in paragraph (a)(3) of this section.
[GRAPHIC] [TIFF OMITTED] TC13NO91.042

    (3) When calculating percent monitor data availability using 
Equation 8 or 9, the owner or operator shall include all unit operating 
hours, and all monitor operating hours for which quality-assured data 
were recorded by a certified primary monitor; a certified redundant or 
non-redundant backup monitor or a reference method for that unit; or by 
an approved alternative monitoring system under subpart E of this part. 
No hours from more than three years (26,280 clock hours) earlier shall 
be used in Equation 9. For a unit that has accumulated fewer than 8,760 
unit operating hours in the previous three years (26,280 clock hours), 
replace the words ``during previous 8,760 unit operating hours'' in the 
numerator of Equation 9 with ``in the previous three years'' and replace 
``8,760'' in the denominator of Equation 9 with ``total unit operating 
hours in the previous three years.'' The owner or operator of a unit 
with an SO2 monitoring system shall, when SO2 
emissions are determined in accordance with Sec. 75.11(e)(1) or (e)(2), 
exclude hours in which a unit combusts only gaseous fuel from 
calculations of percent monitor data availability for SO2 
pollutant concentration monitors, as provided in Sec. 75.30(d).
    (b) The monitor data availability need not be calculated during the 
missing data period. The owner or operator shall record the percent 
monitor data availability for the last hour of each missing data period 
as the monitor availability used to implement the missing data 
substitution procedures.

[58 FR 3701, Jan. 11, 1993, as amended at 60 FR 26529, 26567, May 17, 
1995; 61 FR 59160, Nov. 20, 1996; 64 FR 28602, May 26, 1999; 67 FR 
40434, June 12, 2002]