[Federal Register Volume 81, Number 97 (Thursday, May 19, 2016)]
[Rules and Regulations]
[Pages 31515-31520]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2016-10989]



40 CFR Part 60

[EPA-HQ-OAR-2013-0696; FRL-9944-26-OAR]
RIN 2060-AS86

Technical Amendments to Performance Specification 18 and 
Procedure 6

AGENCY: Environmental Protection Agency (EPA).

ACTION: Direct final rule.


SUMMARY: The Environmental Protection Agency (EPA) is taking direct 
final action to make several minor technical amendments to the 
performance specifications and test procedures for hydrogen chloride 
(HCl) continuous emission monitoring systems (CEMS). This direct final 
rule also makes several minor amendments to the quality assurance (QA) 
procedures for HCl CEMS used for compliance determination at stationary 
sources. The performance specification (Performance Specification 18) 
and the QA procedures (Procedure 6) were published in the Federal 
Register on July 7, 2015. These amendments make several minor 
corrections and clarify several aspects of these regulations.

DATES: This rule is effective on August 17, 2016 without further 
notice, unless the EPA receives adverse comment by July 5, 2016. If the 
EPA receives adverse comment, we will publish a timely withdrawal in 
the Federal Register informing the public that the rule will not take 

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-HQ-
OAR-2013-0696, at http://www.regulations.gov. Follow the online 
instructions for submitting comments. Once submitted, comments cannot 
be edited or removed from Regulations.gov. The EPA may publish any 
comment received to its public docket. Do not submit electronically any 
information you consider to be Confidential Business Information (CBI) 
or other information whose disclosure is restricted by statute. 
Multimedia submissions (audio, video, etc.) must be accompanied by a 
written comment. The written comment is considered the official comment 
and should include discussion of all points you wish to make. The EPA 
will generally not consider comments or comment contents located 
outside of the primary submission (i.e., on the Web, Cloud, or other 
file sharing system). For additional submission methods, the full EPA 
public comment policy, information about CBI or multimedia submissions, 
and general guidance on making effective comments, please visit http://www2.epa.gov/dockets/commenting-epa-dockets.

of Air Quality Planning and Standards, Air Quality Assessment Division, 
Measurement Technology Group (Mail Code: E143-02), Research Triangle 
Park, NC 27711; telephone number: (919) 541-1064; fax number: (919) 
541-0516; email address: [email protected].

SUPPLEMENTARY INFORMATION: The information presented in this rule is 
organized as follows:

I. General Information
    A. Why is the EPA using a direct final rule?
    B. Does this action apply to me?
    C. What should I consider as I prepare my comments for the EPA?
    D. Where can I obtain a copy of this document?
    E. Judicial Review
II. This Action
III. Statutory and Executive Order Reviews
    A. Executive Order 12866: Regulatory Planning and Review and 
Executive Order 13563: Improving Regulation and Regulatory Review
    B. Paperwork Reduction Act (PRA)
    C. Regulatory Flexibility Act (RFA)
    D. Unfunded Mandates Reform Act (UMRA)

[[Page 31516]]

    E. Executive Order 13132: Federalism
    F. Executive Order 13175: Consultation and Coordination With 
Indian Tribal Governments
    G. Executive Order 13045: Protection of Children From 
Environmental Health Risks and Safety Risks
    H. Executive Order 13211: Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use
    I. National Technology Transfer and Advancement Act
    J. Executive Order 12898: Federal Actions To Address 
Environmental Justice in Minority Populations and Low-Income 
    K. Congressional Review Act (CRA)

I. General Information

A. Why is the EPA using a direct final rule?

    The EPA is publishing this direct final rule without a prior 
proposed rule because we view this as a non-controversial action and 
anticipate no adverse comment. This action makes minor technical 
amendments to Performance Specification 18 (PS 18) and Procedure 6. 
However, in the ``Proposed Rules'' section of this Federal Register, we 
are publishing a separate document that will serve as the proposed rule 
to announce the EPA's intent to amend PS 18 and Procedure 6, if adverse 
comments are received on this direct final rule by July 5, 2016. We 
will not institute a second comment period on this action. Any parties 
interested in commenting must do so at this time. For further 
information about commenting on this rule, see the ADDRESSES section of 
this document. If the EPA receives adverse comment, the EPA will 
publish a timely withdrawal in the Federal Register informing the 
public that the rule will not take effect. The EPA will address all 
public comments in a subsequent final rule based on the proposed rule. 
Please note that if the EPA receives adverse comment on an amendment, 
paragraph, or section of this rule and if that provision may be severed 
from the remainder of the rule, the EPA may adopt as final those 
provisions of the rule that are not the subject of an adverse comment.

B. Does this action apply to me?

    The major entities that would potentially be affected by the final 
PS 18 and the QA requirements of Procedure 6 for gaseous HCl CEMS are 
those entities that are required to install a new HCl CEMS, relocate an 
existing HCl CEMS, or replace an existing HCl CEMS under any applicable 
subpart of 40 Code of Federal Regulations (CFR) part 60, 61, or 63. 
Table 1 of this preamble lists the current federal rules by subpart and 
the corresponding source categories to which the PS 18 and Procedure 6 
potentially would apply.

  Table 1--Source Categories That Would Potentially Be Subject to PS 18
                             and Procedure 6
            Subpart(s)                         Source category
                             40 CFR part 63
Subpart LLL.......................  Portland Cement Manufacturing
Subpart UUUUU.....................  Coal- and Oil-fired Electric Utility
                                     Steam Generating Units.
Subpart DDDDD.....................  Industrial, Commercial, and
                                     Institutional Boilers and Process

    The requirements of PS 18 and Procedure 6 may also apply to 
stationary sources located in a state, district, reservation, or 
territory that adopts PS 18 or Procedure 6 in its implementation plan.
    Table 2 lists the corresponding North American Industry 
Classification System (NAICS) codes for the source categories listed in 
Table 1 of this preamble.

            Table 2--NAICS for Potentially Regulated Entities
                       Industry                            NAICS Codes
Fossil Fuel-Fired Electric Utility Steam Generating               327310
                                                              \a\ 921150
Portland Cement Manufacturing Plants..................            327310
Industrial, Commercial, and Institutional Boilers and                211
 Process Heaters......................................
                                                           316, 326, 339
\a\ Industry in Indian Country.

    Tables 1 and 2 are not intended to be exhaustive, but rather they 
provide a guide for readers regarding entities potentially affected by 
this action. If you have any questions regarding the potential 
applicability of PS 18 and test procedures (Procedure 6) to a 
particular entity, consult the person listed in the FOR FURTHER 

C. What should I consider as I prepare my comments for the EPA?

    a. Submitting CBI. Do not submit this information to the EPA 
through https://www.regulations.gov or email. Clearly mark the part or 
all of the information that you claim to be CBI. For CBI

[[Page 31517]]

information in a disk or CD ROM that you mail to the EPA, mark the 
outside of the disk or CD ROM as CBI and then identify electronically 
within the disk or CD ROM the specific information that is claimed as 
CBI. In addition to one complete version of the comment that includes 
information claimed as CBI, a copy of the comment that does not contain 
the information claimed as CBI must be submitted for inclusion in the 
public docket. Information so marked will not be disclosed except in 
accordance with procedures set forth in 40 CFR part 2.
    b. Tips for Preparing Your Comments. When submitting comments, 
remember to:
     Identify the rulemaking by docket number and other 
identifying information (subject heading, Federal Register date and 
page number).
     Follow directions. The agency may ask you to respond to 
specific questions or organize comments by referencing a CFR part or 
section number.
     Explain why you agree or disagree; suggest alternatives 
and substitute language for your requested changes.
     Describe any assumptions and provide any technical 
information and/or data that you used.
     If you estimate potential costs or burdens, explain how 
you arrived at your estimate in sufficient detail to allow for it to be 
     Provide specific examples to illustrate your concerns, and 
suggest alternatives.
     Explain your views as clearly as possible, avoiding the 
use of profanity or personal threats.
     Make sure to submit your comments by the comment period 
deadline identified.

D. Where can I obtain a copy of this action?

    In addition to being available in the docket, an electronic copy of 
this rule will also be available on the Worldwide Web (WWW) through the 
Technology Transfer Network (TTN) Web site. Following publication, the 
EPA will post the Federal Register version of the promulgation and key 
technical documents at http://www3.epa.gov/ttn/emc/propperf.html.

E. Judicial Review

    Under section 307(b)(1) of the Clean Air Act (CAA), judicial review 
of this action must be filed in the United States Court of Appeals for 
the DC Circuit by July 18, 2016. Filing a petition for reconsideration 
by the Administrator of this final rule does not affect the finality of 
this action for the purposes of judicial review nor does it extend the 
time within which a petition for judicial review may be filed, and 
shall not postpone the effectiveness of such rule or action. Parties 
with objections to this direct final rule are encouraged to file a 
comment in response to the parallel notice of proposed rulemaking for 
this action published in the proposed rules section of this Federal 
Register, rather than file an immediate petition for judicial review of 
this direct final rule, so that the EPA can withdraw this direct final 
rule and address the comment in the proposed rulemaking. This action 
may not be challenged later in proceedings to enforce its requirements. 
(See section 307(b)(2).)

II. This Action

    On July 7, 2015, the EPA promulgated PS 18, that includes 
requirements for the initial acceptance of CEMS to measure HCl 
emissions (80 FR 38628). In that same action, we promulgated Procedure 
6 specifying the minimum QA requirements necessary for control and 
assessment of the quality of CEMS data submitted to the EPA. 
Performance Specification 18 is applicable to the evaluation of HCl 
continuous monitoring instruments for Portland cement facilities, 
electric generating units, and industrial, commercial, and 
institutional boilers and process heaters. After publication of PS 18 
and Procedure 6, we identified minor definition inconsistencies and 
unintended differences between the proposal and the final rule. In this 
action, we are making corrections to PS 18 and Procedure 6 as noted 
below to eliminate such inconsistencies and to remove unintended 
changes that occurred between the notice of proposed rulemaking and the 
final rulemaking.
    This action:
    (1) Adds definitions for beam attenuation and beam intensity to 
clarify the meaning of these terms (Section 3.0);
    (2) Clarifies which detection limits must be less than 20 percent 
of the applicable emission limit (Section;
    (3) Revises the requirements to determine zero gas calibration 
drift measurements by allowing either exclusion or inclusion of the 
measurement optical path (Section;
    (4) Revises definitions for terms Ci, and S, to make 
them consistent with other performance specifications (Section 12.1);
    (5) Corrects equation 2 in PS 18 to include the average measured 
concentration of HCl used to calculate CEMS interference. This change 
clarifies that single or multiple interferent gases are allowed to be 
evaluated in PS 18 (Section 12.2);
    (6) Revises equation 7 in PS 18 to include an additional term that 
allows correction for the measured native background HCl concentration. 
This revision permits calculations for either option in revised section (Section 12.4.4);
    (7) Corrects appendix A, equation 3 in PS 18 for calculating 
dilution factors when dynamic spike quality control measurements are 
made (PS 18 appendix A, Section 11.2.3);
    (8) Clarifies, in Procedure 6, that QA for data above span is 
subject to the specific requirements in applicable rules or permits, 
that supersede the general requirements in Procedure 6 (Section 4.1.5 
    (9) Resolves, in Procedure 6, prior confusion between greater than 
two clock hours and greater than two consecutive 1-hour averages in the 
measurement period for exceedance of span before additional CEMS 
responses checks are required (Section;
    (10) Clarifies the units of measure (percent) required for 
Integrated Path CEMS beam intensity check (Section 4.2.1); and
    (11) Corrects the incomplete reference to the equations required to 
calculate dynamic spiking error (DSE) (Section

III. Statutory and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive 
Order 13563: Improving Regulation and Regulatory Review

    This action is not a significant regulatory action and, therefore, 
was not submitted to the Office of Management and Budget (OMB) for 

B. Paperwork Reduction Act (PRA)

    This action does not impose an information collection burden under 
the PRA. These changes do not add information collection requirements 
beyond those currently required under the applicable regulations.

C. Regulatory Flexibility Act (RFA)

    I certify that this action will not have a significant economic 
impact on a substantial number of small entities under the RFA. This 
action will not impose any requirements on small entities. This action 
makes minor technical correction and adds clarification in PS 18 and 
Procedure 6 and does not impose additional regulatory requirements on 

[[Page 31518]]

D. Unfunded Mandates Reform Act (UMRA)

    This action does not contain any unfunded mandate of $100 million 
or more as described in UMRA, 2 U.S.C. 1531-1538, and does not 
significantly or uniquely affect small governments. This action imposes 
no enforceable duty on any state, local or tribal governments, or the 
private sector.

E. Executive Order 13132: Federalism

    This action does not have federalism implications. It will not have 
substantial direct effects on the states, on the relationship between 
the national government and the states, or on the distribution of power 
and responsibilities among the various levels of government.

F. Executive Order 13175: Consultation and Coordination With Indian 
Tribal Governments

    This action does not have tribal implications, as specified in 
Executive Order 13175. This action adds additional language that 
clarifies several aspects for the performance standard and procedure 
and corrects some minor technical errors, but does not change the 
requirements for conducting the test method. Thus, Executive Order 
13175 does not apply to this action.

G. Executive Order 13045: Protection of Children From Environmental 
Health Risks and Safety Risks

    The EPA interprets Executive Order 13045 as applying only to those 
regulatory actions that concern environmental health or safety risks 
that the EPA has reason to believe may disproportionately affect 
children, per the definition of ``covered regulatory action'' in 
section 2-202 of the Executive Order. This action is not subject to 
Executive Order 13045 because it does not concern an environmental 
health risk or safety risk.

H. Executive Order 13211: Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use

    This action is not subject to Executive Order 13211 because it is 
not a significant regulatory action under Executive Order 12866.

I. National Technology Transfer and Advancement Act

    This rulemaking does not involve technical standards.

J. Executive Order 12898: Federal Actions To Address Environmental 
Justice in Minority Populations and Low-Income Populations

    The EPA believes the human health or environmental risk addressed 
by this action will not have potential disproportionately high and 
adverse human health or environmental effects on minority, low-income 
or indigenous populations. This action does not relax the control 
measures on sources regulated by the rule and, therefore, will not 
cause emissions increases from these sources.

K. Congressional Review Act

    The Congressional Review Act, 5 U.S.C. 801 et seq., as added by the 
Small Business Regulatory Enforcement Fairness Act of 1996, generally 
provides that before a rule may take effect, the agency promulgating 
the rule must submit a rule report, which includes a copy of the rule, 
to each House of the Congress and to the Comptroller General of the 
United States. This action is not a ``major rule'' as defined by 5 
U.S.C. 804(2). This rule will be effective August 17, 2016.

List of Subjects in 40 CFR Part 60

    Environmental protection, Administrative practice and procedure, 
Air pollution control, Continuous emission monitoring systems, Hydrogen 
chloride, Performance specifications, Test methods and procedures.

    Dated: May 2, 2016.
Gina McCarthy,
    For the reasons stated in the preamble, title 40, chapter I of the 
Code of Federal Regulations is amended as follows:


1. The authority citation for part 60 continues to read as follows:

    Authority: 42 U.S.C. 7401 et seq.

2. In appendix B to part 60, Performance Specification 18:
a. Revise Sections 3.1 through 3.23,,, 12.1, 12.2 and 
b. Add Sections 3.24, 3.25, and 12.2.1; and
c. Revise Section 11.2.3 in appendix A of Performance Specification 18.
    The revisions and additions read as follows:

Appendix B to Part 60--Performance Specifications

* * * * *


* * * * *
3.0 Definitions

    3.1 Beam attenuation is the reduction in electromagnetic 
radiation (light) throughput from the maximum beam intensity 
experienced during site specific CEMS operation.
    3.2 Beam intensity is the electromagnetic radiation (light) 
throughput for an IP-CEMS instrument measured following 
manufacturers specifications.
    3.3 Calibration cell means a gas containment cell used with 
cross stack or integrated path (IP) CEMS for calibration and to 
perform many of the test procedures required by this performance 
specification. The cell may be a removable sealed cell or an 
evacuated and/or purged cell capable of exchanging reference and 
other calibration gases as well as zero gas standards. When charged, 
it contains a known concentration of HCl and/or interference gases. 
The calibration cell is filled with zero gas or removed from the 
optical path during stack gas measurement.
    3.4 Calibration drift (CD) means the absolute value of the 
difference between the CEMS output response and an upscale reference 
gas or a zero-level gas, expressed as a percentage of the span 
value, when the CEMS is challenged after a stated period of 
operation during which no unscheduled adjustments, maintenance or 
repairs took place.
    3.5 Centroidal area means a central area that is geometrically 
similar to the stack or duct cross section and is no greater than 10 
percent of the stack or duct cross-sectional area.
    3.6 Continuous Emission Monitoring System (CEMS) means the total 
equipment required to measure the pollutant concentration or 
emission rate continuously. The system generally consists of the 
following three major subsystems:
    3.6.1 Sample interface means that portion of the CEMS used for 
one or more of the following: Sample acquisition, sample transport, 
sample conditioning, defining the optical measurement path, and 
protection of the monitor from the effects of the stack effluent.
    3.6.2 HCl analyzer means that portion of the HCl CEMS that 
measures the total vapor phase HCl concentration and generates a 
proportional output.
    3.6.3 Data recorder means that portion of the CEMS that provides 
a permanent electronic record of the analyzer output. The data 
recorder may record other pertinent data such as effluent flow 
rates, various instrument temperatures or abnormal CEMS operation. 
The data recorder may also include automatic data reduction 
capabilities and CEMS control capabilities.
    3.7 Diluent gas means a major gaseous constituent in a gaseous 
pollutant mixture. For combustion sources, either carbon dioxide 
(CO2) or oxygen (O2) or a

[[Page 31519]]

combination of these two gases are the major gaseous diluents of 
    3.8 Dynamic spiking (DS) means the procedure where a known 
concentration of HCl gas is injected into the probe sample gas 
stream for extractive CEMS at a known flow rate to assess the 
performance of the measurement system in the presence of potential 
interference from the flue gas sample matrix.
    3.9 Independent measurement(s) means the series of CEMS data 
values taken during sample gas analysis separated by two times the 
procedure specific response time (RT) of the CEMS.
    3.10 Integrated path CEMS (IP-CEMS) means an in-situ CEMS that 
measures the gas concentration along an optical path in the stack or 
duct cross section.
    3.11 Interference means a compound or material in the sample 
matrix other than HCl whose characteristics may bias the CEMS 
measurement (positively or negatively). The interference may not 
prevent the sample measurement, but could increase the analytical 
uncertainty in the measured HCl concentration through reaction with 
HCl or by changing the electronic signal generated during HCl 
    3.12 Interference test means the test to detect CEMS responses 
to interferences that are not adequately accounted for in the 
calibration procedure and may cause measurement bias.
    3.13 Level of detection (LOD) means the lowest level of 
pollutant that the CEMS can detect in the presence of the source gas 
matrix interferents with 99 percent confidence.
    3.14 Liquid evaporative standard means a reference gas produced 
by vaporizing National Institute of Standards and Technology (NIST) 
traceable liquid standards of known HCl concentration and 
quantitatively diluting the resultant vapor with a carrier gas.
    3.15 Measurement error (ME) is the mean difference between the 
concentration measured by the CEMS and the known concentration of a 
reference gas standard, divided by the span, when the entire CEMS, 
including the sampling interface, is challenged.
    3.16 Optical path means the route light travels from the light 
source to the receiver used to make sample measurements.
    3.17 Path length means, for an extractive optical CEMS, the 
distance in meters of the optical path within a gas measurement 
cell. For an IP-CEMS, path length means the distance in meters of 
the optical path that passes through the source gas in the stack or 
    3.18 Point CEMS means a CEMS that measures the source gas 
concentration, either at a single point at the sampling probe tip or 
over a path length for IP-CEMS less than 10 percent of the 
equivalent diameter of the stack or duct cross section.
    3.19 Stack pressure measurement device means a NIST-traceable 
gauge or monitor that measures absolute pressure and conforms to the 
design requirements of ASME B40.100-2010, ``Pressure Gauges and 
Gauge Attachments'' (incorporated by reference--see Sec.  60.17).
    3.20 Reference gas standard means a NIST-traceable gas standard 
containing a known concentration of HCl certified in accordance with 
an EPA traceability protocol in section 7.1 of this PS.
    3.21 Relative accuracy (RA) means the absolute mean difference 
between the gas concentration or the emission rate determined by the 
CEMS and the value determined by the RM, plus the confidence 
coefficient of a series of nine test runs, divided by the average of 
the RM or the applicable emission standard.
    3.22 Response time (RT) means the time it takes for the 
measurement system, while operating normally at its target sample 
flow rate, dilution ratio, or data collection rate to respond to a 
known step change in gas concentration, either from a low- or zero-
level to a high-level gas concentration or from a high-level to a 
low or zero-level gas concentration, and to read 95 percent of the 
change to the stable instrument response. There may be several RTs 
for an instrument related to different functions or procedures 
(e.g., DS, LOD, and ME).
    3.23 Span value means an HCl concentration approximately equal 
to two times the concentration equivalent to the emission standard 
unless otherwise specified in the applicable regulation, permit or 
other requirement. Unless otherwise specified, the span may be 
rounded up to the nearest multiple of 5.
    3.24 Standard addition means the addition of known amounts of 
HCl gas (either statically or dynamically) to the actual measurement 
path or measured sample gas stream.
    3.25 Zero gas means a gas or liquid with an HCl concentration 
that is below the LOD of the measurement system.
* * * * *
11.0 Performance Specification Test Procedure
* * * * * If your system LOD field verification does not 
demonstrate a SAR greater than or equal to your initial controlled 
environment LOD, you must increase the SA concentration 
incrementally and repeat the field verification procedure until the 
SAR is equal to or greater than LOD. The site-specific standard 
addition detection level (SADL) is equal to the standard addition 
needed to achieve the acceptable SAR, and SADL replaces the 
controlled environment LOD. For extractive CEMS, the SADL is 
calculated as the ESA using Equation A7 in appendix A of this PS. 
For IP-CEMS, the SADL is the SA calculated using Equation A8 in 
appendix A of this PS. As described in section 13.1 of this PS, the 
LOD or the SADL that replaces an LOD must be less than 20 percent of 
the applicable emission limit.
* * * * * For IP-CEMS, you must include the source measurement 
optical path while performing the upscale CD measurement; you may 
exclude the source measurement optical path when determining the 
zero gas concentration. Calculate the CD for IP CEMS using equations 
4, 5, 6B, and 7 in section 12.4.
* * * * *
12.0 Calculations and Data Analysis
12.1 Nomenclature
Ci = Zero or HCl reference gas concentration used for 
test i (ppmv);
Ci,eff = Equivalent concentration of the reference gas 
value, Ci, at the specified conditions (ppmv);
CC = Confidence coefficient (ppmv);
CDextractive = Calibration drift for extractive CEMS 
CDIP = Calibration drift for IP-CEMS (percent);
CD0 = Calibration drift at zero HCl concentrations for an 
IP-CEMS (percent);
davg = Mean difference between CEMS response and the 
reference gas (ppmv);
di = Difference of CEMS response and the RM value (ppmv);
I = Total interference from major matrix stack gases, (percent);
LSF = Line strength factor for IP-CEMS instrument specific 
correction for temperature and gas matrix effects derived from the 
HITRAN and/or manufacturer specific database (unitless);
[Delta]MCavg = Average of the 3 absolute values of the 
difference between the measured HCl calibration gas concentrations 
with and without interference from selected stack gases (ppmv);
MCi = Measured HCl reference gas concentration i (ppmv);
MCi = Average of the measured HCl reference gas 
concentration i (ppmv);
MCint = Measured HCl concentration of the HCl reference 
gas plus the individual or combined interference gases (ppmv);
MEextractive = Measurement error for extractive CEMS 
MEIP = Measurement error for IP-CEMS (percent);
MNavg = Average concentration at all sampling points 
MNbi = Measured native concentration bracketing each 
calibration check measurement (ppmv);
MNi = Measured native concentration for test or run I 
n = Number of measurements in an average value;
Pstack = Absolute stack pressure (mm Hg)
Preference = Absolute pressure of the calibration cell 
for IP-CEMS (mm Hg)
PLCell = Path length of IP-CEMS calibration cell (m);
PLStack = Path length of IP-CEMS stack optical path (m);
RA = Relative accuracy of CEMS compared to a RM (percent);
RMi = RM concentration for test run i (ppmv);
RMavg = Mean measured RM value (ppmv);
S = Span value (ppmv);
Sd = Standard deviation of the differences (ppmv);
Sti = Stratification at traverse point i (percent);
SADL = Standard addition detection level (ppmv);
t0.975 = One-sided t-value at the 97.5th percentile 
obtained from Table 5 in section 17.0 for n-1 measurements;
Treference = Temperature of the calibration cell for IP-
CEMS (degrees Kelvin);
Tstack = Temperature of the stack at the monitoring 
location for IP-CEM (degrees Kelvin).

[[Page 31520]]

    12.2 Calculate the difference between the measured HCl 
concentration with and without interferents for each interference 
gas (or mixture) for your CEMS as:

    Calculate the total percent interference as:
    12.2.1 Calculate the equivalent concentration Ci,eff 
using Equation 4:

* * * * *
    12.4.4 Calculate the zero CD as a percent of span for an IP-CEMS 

* * * * *

PS-18 Appendix A Standard Addition Procedures

* * * * *
11.0 Calculations and Data Analysis. * * *
* * * * *
    11.2.3 If you determine your spike dilution factor using an 
independent stable tracer that is present in the native source 
emissions, calculate the dilution factor for dynamic spiking using 
equation A3:

* * * * *
3. In appendix F to part 60, revise Sections 4.1.5,,, 
and in Procedure 6 to read as follows:

Appendix F to Part 60--Quality Assurance Procedures

* * * * *

Procedure 6. Quality Assurance Requirements for Gaseous Hydrogen 
Chloride (HCl) Continuous Emission Monitoring Systems Used for 
Compliance Determination at Stationary Sources

* * * * *
4.0 Daily Data Quality Requirements and Measurement Standardization 
* * * * *
    4.1.5 Additional Quality Assurance for Data above Span. Unless 
otherwise specified in an applicable rule or permit, this procedure 
must be used to assure data quality and may be used when significant 
data above span is being collected. Any time the average measured concentration of HCl 
exceeds 150 percent of the span value for two consecutive 1-hour 
averages, conduct the following `above span' CEMS response check.
* * * * * Unless otherwise specified in an applicable rule or 
permit, if the `above span' response check is conducted during the 
period when measured emissions are above span and there is a failure 
to collect at least one data point in an hour due to the response 
check duration, then determine the emissions average for that missed 
hour as the average of hourly averages for the hour preceding the 
missed hour and the hour following the missed hour
* * * * *
5.0 Data Accuracy Assessment
* * * * * Calculate results as described in section 6.4. To 
determine CEMS accuracy you must calculate the dynamic spiking error 
(DSE) for each of the two upscale audit gases using equation A5 in 
appendix A to PS-18 and Equation 6-3 in section 6.4 of Procedure 6 
in appendix B to this part.
* * * * *
[FR Doc. 2016-10989 Filed 5-18-16; 8:45 am]