Acid Rain Program under Title IV of the Clean Air Act Amendments

ECMPS Reporting Instructions

Emissions

United States Environmental Protection Agency

Office of Air and Radiation

Clean Air Markets Division

1310 L Street, NW

Washington, DC 20005

March 07, 2012September 19, 2012

Table of Contents

March 07, 2012September 19, 2012

Table of Contents
Page
1.0 INTRODUCTION: EMISSIONS ....................................................................................................1

2.0 EMISSIONS .................................................................................................................................5

2.1 SUMMARY VALUE DATA .........................................................................................................7

2.2 DAILY TEST SUMMARY DATA ...............................................................................................13

2.2.1 DAILY CALIBRATION DATA ........................................................................................... 17

2.3 DAILY EMISSIONS DATA .......................................................................................................26

2.3.1 DAILY FUEL DATA ......................................................................................................... 28

2.4 HOURLY OPERATING DATA...................................................................................................29

2.4.1 MONITOR HOURLY VALUE DATA................................................................................... 35

2.4.2 DERIVED HOURLY VALUE DATA.................................................................................... 57

2.4.3 HOURLY FUEL FLOW DATA............................................................................................ 73

2.4.3.1 HOURLY PARAMETER FUEL FLOW DATA ................................................................. 81

2.5 LONG TERM FUEL FLOW DATA .............................................................................................89

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Table of Contents

List of Tables
Page
Table 1 Parameter Codes and Descriptions for SUMMARY VALUE DATA ..................................... 9

Table 2 Precision of Reported Values for SUMMARY VALUE DATA............................................ 10

Table 3 Daily Test Result Code Descriptions.............................................................................. 15

Table 4 Precision of Reported Values for DAILY CALIBRATION DATA ........................................ 21

Table 5 PGVP Gas Type Codes and Descriptions....................................................................... 22

Table 6 Load Units of Measure Codes and Descriptions ............................................................ 32

Table 7 Fuel Codes and Descriptions .......................................................................................... 34

Table 8 MHV Elements for SO2C or Flow ................................................................................. 36

Table 9 MHV Elements for NOXC Record -- NOX Rate System Only ..................................... 37

Table 10 MHV Elements for NOXC Record -- NOXC System.................................................. 38

Table 11 Summary of NOx MONITOR HOURLY VALUE Record Reporting

Requirements................................................................................................................ 39

Table 12 MHV Elements for CO2C ............................................................................................ 40

Table 13 MHV Elements for O2C ............................................................................................... 42

Table 14 MHV Elements for H2O............................................................................................... 44

Table 15 Parameter Codes and Descriptions for the MHV DATA Record .................................. 45

Table 16 Precision of Reported Values for MONITOR HOURLY VALUE DATA.............................. 50

Table 17 MODC Codes and Descriptions for MHV ................................................................... 50

Table 18 Moisture Basis Codes and Descriptions for MHV ....................................................... 56

Table 19 Parameter Codes and Descriptions for the DHV DATA Record ................................... 61

Table 20 Precision of Reported Values for DERIVED HOURLY VALUE DATA............................... 66

Table 21 MODC Codes and Descriptions for DHV .................................................................... 67

Table 22 System ID Reporting for Derived Hourly Values ........................................................ 69

Table 23 Operating Condition Codes and Descriptions for DHV ............................................... 70

Table 24 Fuel Codes and Descriptions ........................................................................................ 71

Table 25 Oil Fuel Flow Fuel Codes and Descriptions................................................................. 74

Table 26 Gas Fuel Flow Fuel Codes and Descriptions................................................................ 75

Table 27 Volumetric Units of Measure Codes and Descriptions ................................................ 77

Table 28 Source of Data Volumetric Codes and Descriptions .................................................... 77

Table 29 Source of Data Mass Codes and Descriptions .............................................................. 79

Table 30 Parameter Codes and Descriptions for HOURLY

PARAMETER FUEL FLOW ............................................................................................... 82

Table 31 Precision of Reported Values for Parameter Value for Fuel ........................................ 83

Table 32 Sample Type Codes and Descriptions .......................................................................... 84

Table 33 Operating Condition Codes and Descriptions for HOURLY PARAMETER FUEL FLOW .. 85

Table 34 Units of Measure Codes and Descriptions for HOURLY

PARAMETER FUEL FLOW ............................................................................................... 87

Table 35 Long Term Fuel Flow UOM Code ............................................................................... 92

Table 36 GCV Units of Measure Code........................................................................................ 93

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List of Figures
Page
Figure 1: EMISSIONS XML SCHEMA COMPLEX Elements .............................................................. 3

Figure 2: EMISSIONS XML Elements ............................................................................................. 5

Figure 3: SUMMARY VALUE DATA XML Elements ....................................................................... 7

Figure 4: DAILY TEST SUMMARY DATA XML Elements ............................................................. 13

Figure 5: DAILY CALIBRATION DATA XML Elements................................................................. 17

Figure 6: DAILY EMISSION DATA XML Elements ....................................................................... 26

Figure 7: DAILY FUEL DATA XML Elements .............................................................................. 28

Figure 8: HOURLY OPERATING DATA XML Elements................................................................. 29

Figure 9: MONITOR HOURLY VALUE DATA XML Elements........................................................ 35

Figure 10: DERIVED HOURLY VALUE DATA XML Elements....................................................... 57

Figure 11: HOURLY FUEL FLOW DATA XML Elements............................................................... 73

Figure 12: HOURLY PARAMETER FUEL FLOW DATA XML Elements .......................................... 81

Figure 13: LONG TERM FUEL FLOW DATA XML Elements ......................................................... 89

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1.0 Introduction: Emissions

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ECMPS Reporting Instructions

Emissions

1.0 INTRODUCTION: EMISSIONS
About This Document
In the Emissions Collection and Monitoring Plan System (ECMPS), data must be submitted to
the EPA through the Client Tool using extensible-markup language (XML) format. XML files
must contain certain data elements, which are defined in the XML schema. (Note: More
information about the ECMPS XML Schemas can be found in the XML Schema Description
Documents.)
The purpose of the reporting instructions is to provide the necessary information for owners and
operators to meet the reporting requirements for sources affected by:
1) The Acid Rain Program (ARP);
2) The Clean Air Interstate Rule (CAIR); and
3) Other programs required to report data using these XML schemas.
These instructions explain how to report the required data for the applicable regulations. Owners
and operators of units should refer to the applicable regulations for information about what data
are required to be reported.
The Emissions XML Schema is made up of a root element, complex elements, and simple
elements. A simple element is a single piece of data. A complex element is a group of simple
elements which are logically grouped together. The root element is the base of the XML
schema.
The elements are related to each other in parent-child relationships. The root element is the
parent element of the entire schema. Complex elements are children of the root element, and
complex elements can also be children of other complex elements. If a complex element is
dependent on a parent complex element, the child complex element cannot be included in the
XML file unless the appropriate parent complex element is also included. Figure 1 below
illustrates the relationships between the emissions root element and the complex elements.
This document provides instructions on how the required data should be reported using this data
structure. A separate section is provided for each complex element, its dependencies, and its
simple elements. In addition, there are "specific considerations" that apply to particular types of
monitoring plan configurations.
About Emissions Data
Emissions data are hourly values for measured parameters, calculated hourly emissions values,
instrument calibration data, and aggregated summary data. An emissions file contains one

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1.0 Introduction: Emissions

calendar quarter of hourly and aggregate emissions measurements for a specified unit or group of
related units, including stacks and pipes.
Each unit that is required to submit emissions data for a particular calendar quarter must be
included in one and only one emissions file for that quarter. Each emissions file should contain
all relevant operating, daily quality assurance, and emissions data for all units, common stacks,
multiple stacks, or common pipes that were in a common monitoring configuration for any part
of the quarter.
You must submit an emissions file for each quarter or, for ozone season only reporters, for the

second and third calendar quarters of each year.

Rounding Conventions for Reporting Emissions Values
Each emissions value that is reported must be rounded to a specified number of decimal places.

The appropriate number of decimal places is based on the parameter, fuel type, and/or record

type. Because some fields were designed to be generic and support reporting data for different

parameters, it is not always appropriate to report values to the number of decimal places in the

XML format. The appropriate precision for each parameter (and fuel type) can be found in the

instructions under each record type.

Use the standard arithmetic rounding convention where numbers five through nine round to the

next highest number in the previous decimal position to the left.

For example, when reporting SO2C, NOXC, CO2C, O2C, or H2O in the MONITOR HOURLY
VALUE DATA (MHV) record, round these values to the nearest 0.1 ppm or 0.1 percent (as
applicable). When reporting FLOW, the last significant digit in the reported flow rate values is
in the thousands place; fill in zeros in the hundreds, tens, and unit columns (e.g., round 15,
922,855 scfh to 15,923,000 scfh). When reporting NOXR in the DERIVED HOURLY VALUE DATA
(DHV) record, round the NOx emission rate to three decimal places.
Use of Rounded and Unrounded Values in Emissions Calculations
When performing calculations using any value that is reported in the XML, use the value as it is
reported. In other words, use the rounded value in the calculation. However, any value that is
calculated in an intermediate equation but is not reported should not be rounded before using it in
a subsequent equation.
For example, to calculate the bias-adjusted SO2 concentration, multiply the
UnadjustedHourlyValue in the SO2C MHV record (which has been reported as a value rounded
to one decimal place) by the bias adjustment factor (which has been reported in the RATA as a
value rounded to three decimal places), and round the result to one decimal place before
reporting this value as the AdjustedHourlyValue in the MHV record. To calculate the hourly
SO2 mass rate in lb/hr using formula F-1, use the AdjustedHourlyValue in the SO2C MHV
record (which has been rounded to one decimal place) and AdjustedHourlyValue in the FLOW
MHV record (which has been rounded to the nearest thousand) in the equation, and round the
result to one decimal place before reporting this value as the AdjustedHourlyValue in the SO2
DHV record. When calculating quarterly SO2 emissions in tons, first multiply the
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AdjustedHourlyValue in the SO2 DHV record (which has been rounded to one decimal place) by
the OperatingTime (which has been rounded to two decimal places) for every hour. Sum these
unrounded products, then divide this unrounded sum by 2,000. Finally, round the result to one
decimal place before reporting the quarterly emissions value in SUMMARY VALUE DATA record.

Figure 1

EMISSIONS XML SCHEMA COMPLEX Elements

LEGEND
Root
Element

Parent
and
Child

2.0 Emissions

Child Only

2.1
Summary
Value Data

2.2
Daily Test
Summary
Data

2.3
Daily Emission
Data

2.2.1
Daily
Calibration
Data

2.3.1
Daily Fuel
Data

2.4
Hourly
Operating
Data

2.4.1

Monitor Hourly

Value Data

2.5

Long Term

Fuel Flow Data

2.4.2
Derived Hourly
Value Data

2.4.3
Hourly Fuel
Flow Data

2.4.3.1
Hourly
Parameter
Fuel Flow Data

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2.0 EMISSIONS
EMISSIONS XML Model

Figure 2
EMISSIONS XML Elements

EMISSIONS Overview
Description of Data
The EMISSIONS record is the root element for the Emissions data XML schema. This element
identifies the source for which emissions data are being reported. In addition, it provides
information about the reporting period for which data are provided by identifying the year and
quarter. Include a single EMISSIONS record in each Emissions data file.

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2.0 Emissions

EMISSIONS XML Elements

ORIS Code

Element Name: ORISCode
Report the code that indicates the unique identification number given to a source by the Energy

Information Administration (EIA).

Year
Element Name: Year
Report the calendar year represented by the data in the file.
Quarter
Element Name: Quarter
Report the calendar quarter represented by the data in the file. Be sure that the reported year and
quarter are properly matched to the time period of the emissions data.
Submission Comment
Element Name: SubmissionComment
This field can be used to report additional information or provide an explanation about an event

that is specific to the quarterly report. Report the text of the comment in this field.

Version
Element Name: Version
Report the XML schema version number. Note that this is a numeric field -- do not include a "v"
before the number.

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2.1 SUMMARY VALUE DATA
SUMMARY VALUE DATA XML Model

Figure 3

SUMMARY VALUE DATA XML Elements

SUMMARY VALUE DATA Overview
Description of Data
The SUMMARY VALUE DATA records are used to report aggregated values for the parameters
included in the emissions submission file and cumulative values for the year and/or ozone
season. Summary values are reported by monitoring location and parameter on the basis of the
current reporting period, year-to-date, and, if relevant, ozone season-to-date sums (or averages).
For each monitoring location in the file, report a SUMMARY VALUE DATA record for operating
time and another for operating hours. Also report a SUMMARY VALUE DATA record for each
parameter measured or calculated at that location to meet a regulatory requirement. See Table 1
below for applicable parameters.
For units required to report heat input (HI), you must include for each unit a SUMMARY VALUE
DATA record for HI whether the HI was actually measured at the unit level or apportioned (or
summed) from another location or multiple locations.
Common Stacks or Pipes
The reporting period and cumulative heat input values for the stack or pipe (in mmBtu) must
equal the sum of the HIs for the units associated with the stack or pipe. For the individual units,
report SUMMARY VALUE DATA records only for HI, operating time, and operating hours. Do not
apportion SO2 mass emissions, CO2 mass emissions, or average NOx emission rates to the
individual units.

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2.1 Summary Value Data

Multiple Stacks or Pipes
For these configurations, report only the reporting period and cumulative HI, operating time,

operating hours, and weighted average NOx emission rates in the unit-level SUMMARY VALUE

DATA records. Do not report quarterly and cumulative SO2 or CO2 mass emissions at the unit

level. The reported quarterly or cumulative HI value for the unit must equal the sum of the

corresponding HI values reported for the individual stacks, ducts, or pipes.

Complex Stack Configurations
A complex stack configuration exists where a unit's emissions are measured at more than one
stack location and where at least one of these stack locations is a common stack shared with one
or more other units.
For the purposes of quarterly and cumulative HI accounting, the sum of the HIs for all units
associated with all stacks in a complex configuration must equal the sum of the stack HIs for all
of the stacks. For example, if emissions from scrubbed Units 1, 2, and 3 are measured at CS1
during normal unit operation and are measured at CS2 during scrubber bypass hours, the sum of
the HIs for Units 1, 2, and 3 must equal the sum of the HIs for CS1 and CS2.
See "Specific Considerations" below for information about how to calculate summary values.
SUMMARY VALUE DATA XML Elements

Unit ID or Stack Pipe ID

Element Name: UnitID or StackPipeID
Report either the Unit ID or Stack Pipe ID that corresponds to the summary data value location.
This is the alphanumeric code assigned by a source to identify a unit, stack, or pipe.
Parameter Code
Element Name: ParameterCode
Report the Parameter Code for the parameter summarized by this SUMMARY VALUE DATA

record. Use the appropriate uppercase code as shown in Table 1.

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Table 1

Parameter Codes and Descriptions for SUMMARY VALUE DATA

Code

Description

BCO2

Biogenic CO2 Mass (tons)
This is only for RGGI affected units

CO2M

Carbon Dioxide Mass (tons)

HIT

Heat Input Total (mmBtu)

NOXM

Nitrogen Oxide Mass (tons)

NOXR

Nitrogen Oxide Rate (lb/mmBtu)

OPTIME

Operating Time (hr)

OPHOURS

Number of Operating Hours

SO2M

Sulfur Dioxide Mass (tons)

Current Reporting Period Total
Element Name: CurrentReportingPeriodTotal
Report the cumulative parameter value (i.e., emissions or time) as measured from the beginning
of the current reporting period to the end of the current reporting period. This will generally be
the quarterly total (or average), except for the second calendar quarter file for ozone season only
reporters. For those files, this value is the total (or average) for just May and June. The value
should be rounded to the number of decimal places according to Table 2. If there was no
operation at this location during the reporting period, report zero.
Ozone Season to Date Total
Element Name: OzoneSeasonToDateTotal
For locations subject to ozone season only programs, report the cumulative parameter value (i.e.,
emissions or time) for the ozone season as follows: For a first quarter report, leave this field
blank. For a second quarter report, report the sum parameter value (i.e., emissions or time) from
the beginning of the ozone season (May 1) to the end of the reporting period. For a third quarter
report, report the sum of the Ozone Season to Date Total value reported in the second quarter
plus the quarterly value for the parameter reported for the third quarter. For a fourth quarter
report, report the Ozone Season to date total from the third quarter report. All values should be
rounded to the number of decimal places according to Table 2. If there was no operation at this
location during the ozone season, report zero. For locations not subject to ozone season only
programs, leave this field blank.
Year to Date Total
Element Name: YearToDateTotal
For locations that report year-round, report the cumulative sum of current year quarterly totals
for each parameter value (i.e., emissions or time) as follows: For a first quarter report, report the
sum parameter value (i.e., emissions or time) for the quarter. For subsequent quarters, report the
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2.1 Summary Value Data

sum of the current reporting period plus the quarterly values for the parameter reported in the
previous quarters. For example, the Year to Date total for quarter three would be calculated by
summing the current quarter three reporting period value with the previously reported quarter
one and quarter two values. The value should be rounded to the number of decimal places
according to Table 2. If there was no operation at this location during the calendar year-to-date,
report zero. For ozone season only reporters, leave this field blank.

Table 2

Precision of Reported Values for SUMMARY VALUE DATA

Parameter Codes

Number of Decimal Places

CO2M, NOXM, SO2M, BCO2

One

OPTIME

Two

NOXR

Three

HIT

Zero

Specific Considerations
Operating Time and Operating Hours
● Operating Time is the sum of the hourly OperatingTime in HOURLY OPERATING DATA
records. Operating Hours is a count of HOURLY OPERATING DATA records with
OperatingTime greater than zero.
SO2M, NOXM, HIT, and CO2M from Hourly Data
● For non-Low Mass Emissions (LME) locations, to calculate Reporting Period, Year to
Date, and Ozone Season to Date totals for SO2M, and NOXM, multiply each hourly rate
value reported in the DERIVED HOURLY VALUE record by the corresponding operating
time in the HOURLY OPERATING record, sum those values, and then divide by 2,000.
Round the resulting sum to the appropriate number of decimal places per Table 2. For
CO2M, follow the same procedure but do not divide by 2,000.
● For LME units, to calculate Reporting Period, Year to Date, and Ozone Season to Date
totals for SO2M, NOXM and HIT, sum the values in the DERIVED HOURLY VALUE
records and divide by 2,000. Round the resulting sum to the appropriate number of
decimal places per Table 2. For CO2M, follow the same procedure but do not divide by
2,000.
● If a common fuel pipe (or supply tank) serves a group of LME units and the long-term
fuel flow option is used to quantify heat input, report the cumulative heat input for the
group of units under the common pipe (or tank) ID. If more than one common pipe (or
tank) serves the same group of LME units, report a separate SUMMARY VALUE DATA
record for Total Heat Input (HIT) for each pipe (or tank).
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CO2M from Daily Data
● If CO2 mass is calculated on a daily basis and reported in the DAILY EMISSIONS DATA
record, calculate Reporting Period, Year to Date, and Ozone Season to Date for CO2M
by summing the values in these records. Round the resulting sum to the appropriate
number of decimal places per Table 2.
NOx Emission Rate
● For non-Acid Rain units, do not report a SUMMARY VALUE DATA record for NOXR, even
if the NOx emission rate is calculated on an hourly basis for the purpose of determining
NOx mass rate (lb/hr).
● Calculate summary NOx emission rates as a straight arithmetic average of the NOx
emission rates for all operating hours in the reporting period, ozone season, or year-to­
date period, as reported in the DERIVED HOURLY VALUE DATA. If the recorded NOx
emission rate is zero, include these hours in the average only if the operating time for the
hour is greater than zero.
● Do not weight the quarterly or cumulative average NOx emission rate for partial
operating hours (i.e., count all hourly NOx emission rates equally, irrespective of the unit
operating time). Report both the quarterly and cumulative average NOx emission rates
for the unit or stack to three decimal places.
● For simple multiple stack or multiple duct configurations in which NOx emissions and
heat input are monitored separately in each of the stacks or ducts, you must calculate and
report the quarterly and cumulative arithmetic average NOx emission rate for each stack
or duct, and you must also calculate and report a quarterly and cumulative heat inputweighted NOx emission rate for the unit. Determine the heat input-weighted averages for
the unit as follows. First, use the reported hourly data (i.e., stack level NOx emission and
heat input rates) and the following formula to calculate a heat input-weighted unit NOx
emission rate for each stack operating hour in the quarter:
Hourly Unit NO x Emission Rate (lb/mmBtu) =

(NO x Rate)A(Heat Input)A + (NO x Rate)B(Heat Input)B
(Heat Input)A + (Heat Input)B

● In the formula above, the term "Heat Input" for multiple stack A or B is the product of
the hourly HI rate for the stack and the corresponding operating time for the stack.
● When a multiple-stack configuration is selected for a combined-cycle combustion turbine
(CT) that: (a) uses the provisions of Appendix D to Part 75 for unit HI; and (b) has a
main stack and bypass stack configuration; and (c) has NOx-diluent monitoring systems
on both the main and bypass stacks, the mathematics are slightly different. In this case,
for any unit operating hour in which gases flow through both stacks for any part of the
hour, a time-weighted, rather than a heat-input-weighed unit-level NOx emission rate is
calculated, using an equation similar to the one above, except that the terms "(Heat
Input)A" and "(Heat Input)B" are replaced with tA and tB, respectively, where tA and tB
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2.1 Summary Value Data

are the main stack operating time and bypass stack operating time, respectively. The
time-weighted hourly average NOx emission rates are then used to determine the
quarterly and cumulative NOx emission rates for the unit.
● The quarterly heat input-weighted average NOx emission rate for the unit is then
determined by taking the sum of all of the hourly heat input-weighted NOx emission rates
for the quarter and dividing this sum by the total number of unit operating hours in the
quarter. In determining the number of unit operating hours in the quarter, each partial
operating hour is counted as a full hour of unit operation. The cumulative heat inputweighted average NOx emission rate for the unit is determined in the same way as the
quarterly average for the unit, except that the terms "for the quarter" and "in the quarter"
are replaced, respectively, with the terms, "for the year, to date" and "in the year, to date."
● For Acid Rain Program (ARP) LME units, determine the quarterly average NOx emission
rate for each unit as follows: Sum all of the hourly NOx mass values from the DERIVED
HOURLY VALUE records for NOx to get the total NOx mass for the quarter. Then, sum the
hourly HI values from the DERIVED HOURLY VALUE records for HI to obtain the HIT for
the quarter. Divide the total NOx mass for the quarter by the total quarterly HI, to
determine the quarterly NOx emission rate in lb/mmBtu. Calculate the cumulative (year­
to-date) NOx emission rate by separately summing the hourly NOx mass and HI values
over all operating hours in all quarters, and then dividing the NOx mass sum by the HI
sum.

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2.2 Daily Test Summary Data

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2.2 DAILY TEST SUMMARY DATA
DAILY TEST SUMMARY DATA XML Model

Figure 4

DAILY TEST SUMMARY DATA XML Elements

DAILY TEST SUMMARY DATA Overview
Description of Data
The DAILY TEST SUMMARY DATA record summarizes the completion date and time and the
results (Passed/Failed/Aborted) for each daily calibration error test and flow interference check.
For each calibration error test, report the calibration test data in the DAILY CALIBRATION DATA
record. (See instructions for that record below.) Also use the DAILY TEST SUMMARY DATA
record to report the results of the daily Predictive Emissions Monitoring System (PEMS)
calibration for units with an approved PEMS monitoring method.
Report the results of all failed, passing, and incomplete calibrations that affect data validation.
For redundant backup monitors, the results of daily calibration error tests need not be reported
except on days when using the monitors to report emissions data.
Do not report the results of off-line calibrations performed during periods of non-operation of the
unit or stack unless the unit has passed the off-line calibration demonstration and is using off-line
calibrations to validate data.
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2.1 Summary Value Data

DAILY TEST SUMMARY DATA XML Elements
Unit ID or Stack Pipe ID
Element Name: UnitID or StackPipeID
Report either the Unit ID or Stack Pipe ID for the daily test location. This is the alphanumeric

code assigned by a source to identify a unit or stack.

Date
Element Name: Date
For daily calibrations, report the date corresponding to the completion of the last gas injection of
the test. For interference checks, report the date on which the test was completed.
Hour
Element Name: Hour
For daily calibrations, report the hour corresponding to the completion of the last gas injection of
the test. For interference checks, report the hour in which the test was completed.
Minute
Element Name: Minute
For daily calibrations, report the minute corresponding to the completion of the last gas injection
of the test. For interference checks, report the minute in which the test was completed.
Monitoring System ID
Element Name: MonitoringSystemID
If this is a PEMS Calibration test, report the three-character Monitoring System ID for the NOXP
system. Leave this field blank for other parameters.
Component ID
Element Name: ComponentID
Report the three-character ID assigned to the component. Leave this field blank for PEMSCAL.
Test Type Code
Element Name: TestTypeCode
Report the test type code as DAYCAL for a daily calibration test summary record, or as
INTCHK for an interference check. For units with an approved PEMS methodology, report the
test type code as PEMSCAL for daily PEMS calibration tests.
Test Result Code
Element Name: TestResultCode
Report the test result code as PASSED, PASSAPS, FAILED, INC, or ABORTED. See detailed
descriptions of each code in Table 3.
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Table 3

Daily Test Result Code Descriptions

Code

Description

PASSED

Report whenever the standard performance specification is met for the test. For
daily calibration error tests, report the test as passed only if the zero and upscalelevel calibration error test injections each pass the standard performance
specification in sequence. Partial calibrations, where only one injection level is
completed and passes the performance specification, may not be reported as
"PASSED." Rather, these may either be omitted from the electronic report or
reported as "INC."

PASSAPS

This code applies to daily calibration tests only. Report whenever the standard
performance specification was not met for one or both injections, but the alternative
performance specification (as described in Appendix B, Section 2.1.4(a)) was met
for whichever injections did not meet the standard specification.

FAILED

Report whenever the applicable performance specification is not met for the test.
For daily calibration error tests, report the test as failed whenever either the zerolevel calibration error test or upscale-level calibration error test (or both) have failed
to meet the applicable performance specification. Partial calibrations, where only
one injection level is completed and failed, must be reported as "FAILED." Data
for the systems associated with the specified component will be considered invalid
until a subsequent retest is passed.

INC

Report whenever a calibration error test is not completed at both required
calibration levels and the completed calibration injection passes the applicable
performance specification tests. Incomplete tests have no affect on data validation
and do not satisfy the daily calibration requirements of Part 75.

ABORTED

Report whenever a test is aborted due to a malfunction of the monitoring system.
Data for the systems associated with the specified component will be considered
invalid until a subsequent retest is passed.

Span Scale Code
Element Name: SpanScaleCode
For Daily Calibration tests, report whether the component or the range of the instrument tested is
high (H) or low (L) scale (If the component is a single range and no default high range is in use,
enter "H"). Do not report a span scale code for flow monitor components.

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2.1 Summary Value Data

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2.2.1 DAILY CALIBRATION DATA
DAILY CALIBRATION DATA XML Model

Figure 5

DAILY CALIBRATION DATA XML Elements

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2.2.1 Daily Calibration Data

DAILY CALIBRATION DATA Overview
Description of Data
The DAILY CALIBRATION DATA record is used to report the details of each daily calibration error
test sequence completed. You must report a DAILY CALIBRATION DATA record for each
calibration error test performed that affects data validation. A complete DAILY CALIBRATION
DATA record should contain data for both the zero and upscale calibration point.
Partial calibration error tests (where the tested level passes the applicable specification) do not
satisfy the daily calibration error requirements and are not required to be reported since they
have no affect on data validation. If such calibrations are included in the emissions report, then
report the result as "INC" in the DAILY TEST SUMMARY DATA record. Partial calibration error
tests where the tested level fails to meet the applicable specification must be reported as a
"FAILED" test. You are not required to report additional failed calibration tests for a component
when the data from that component is already considered invalid due to a previously failed
calibration error test. However, please note that tests reported as "FAILED" should be reported
with all the necessary fields completed. Daily calibration error tests conducted with expired gas
cylinders, gas cylinders obtained from a vendor not participating in the PGVP program, or gas
cylinders containing concentrations outside the required percentage of Monitor Span Value
record are considered invalid and should not be reported.
For more information concerning this record regarding moisture monitoring systems, flow

monitors, maintenance procedures, or dual range analyzers, see the "Specific Considerations"

section below.

DAILY CALIBRATION DATA XML Elements
Instructions for completing each element of the HOURLY SUBMISSION COMMENT DATA section

are provided below:

OnLine OffLine Indicator
Element Name: OnLineOffLineIndicator
Indicate whether this daily calibration was performed online (report "1") or offline (report "0").
Upscale Gas Code
Element Name: UpscaleGasCode
Indicate whether the gas used for the upscale injection is high-level or mid-level by reporting the
appropriate code (HIGH or MID). Mid-level gas injections may be performed and reported in
lieu of the high-level injections, provided that the mid-level (MID) gas is more representative of
the actual stack emissions. If the daily calibration was not completed and there was no upscalelevel injection, leave this field blank.
Zero Injection Date
Element Name: ZeroInjectionDate

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Report the date of the completion of the zero gas injection. If the daily calibration was not

completed and there was no zero-level injection, leave this field blank.

Zero Injection Hour
Element Name: ZeroInjectionHour
Report the hour of the completion of the zero gas injection. If the daily calibration was not

completed and there was no zero-level injection, leave this field blank.

Zero Injection Minute
Element Name: ZeroInjectionMinute
Report the minute of the completion of the zero gas injection. If the daily calibration was not

completed and there was no zero-level injection, leave this field blank.

Upscale Injection Date
Element Name: UpscaleInjectionDate
Report the date of the completion of the upscale gas injection. If the daily calibration was not

completed and there was no upscale-level injection, leave this field blank.

Upscale Injection Hour
Element Name: UpscaleInjectionHour
Report the hour of the completion of the gas injection. If the daily calibration was not completed
and there was no upscale-level injection, leave this field blank
Upscale Injection Minute
Element Name: UpscaleInjectionMinute
Report the minute of the completion of the upscale gas injection. If the daily calibration was not
completed and there was no upscale-level injection, leave this field blank.
Zero Measured Value
Element Name: ZeroMeasuredValue
Report the value measured by the instrument in response to the reference following the gas

injection or reference signal. Report this value in calibration span units of measure. For all

monitors except flow, the units (and decimal precision) should match the hourly reporting. For

example, for SO2, report concentration in ppm and round the resulting value to the appropriate

number of decimal places in Table 4. For flow, use the calibration units of measure defined in

the MONITOR SPAN VALUE record and round the resulting value to the appropriate number of

decimal places per Table 4.

If the daily calibration was not completed and there was no zero-level injection, leave this field

blank.

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2.2.1 Daily Calibration Data

Upscale Measured Value
Element Name: UpscaleMeasuredValue
Report the value measured by the instrument in response to the reference following the gas
injection or reference signal. Report this value in calibration span units of measure. For all
monitors except flow, the units (and decimal precision) should match the hourly reporting. For
example, for SO2, report concentration in ppm and round the resulting value to the appropriate
number of decimal places per Table 4. For flow, use the calibration units of measure defined in
the MONITOR SPAN VALUE record and round the resulting value to the appropriate number of
decimal places per Table 4.
If the daily calibration was not completed and there was no upscale-level injection, leave this

field blank.

Zero APS Indicator
Element Name: ZeroAPSIndicator
Report whether the zero injection result was determined using a normal specification "0" or the
alternative performance specification "1" allowed under Part 75. If the daily calibration was not
completed and there was no zero level injection, leave this field blank.
Upscale APS Indicator
Element Name: UpscaleAPSIndicator
Report whether the upscale injection result was determined using a normal specification "0" or
the alternative performance specification "1" allowed under Part 75. If the daily calibration was
not completed and there was no upscale-level injection, leave this field blank.
Zero Calibration Error
Element Name: ZeroCalibrationError
Report the calibration error results of the zero-level injection, as required by Part 75 (see the

Upscale Calibration Error element description for further instructions). If the daily calibration

was not completed and there was no zero-level injection, leave this field blank.

Upscale Calibration Error
Element Name: UpscaleCalibrationError
Report the calibration error results of the upscale injection, as required by Part 75. For SO2,
NOx, and flow monitors, express the results either as a percentage of the span value or (for lowemitters of SO2 or NOx, or for low-span differential pressure-type flow monitors) as the absolute
value of the difference between the reference and measured values (i.e., ∗R - A∗). For all
parameters, except for low-span differential pressure-type flow monitors using the alternative
specification, report the calibration error (or ∗R - A∗) to one decimal place. When a low-span
differential pressure-type flow monitor uses the alternative specification because the standard
specification was not met, the ∗R - A∗ value must be reported to two decimal places. If the daily
calibration was not completed and there was no upscale-level injection, leave this field blank.

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If the calculated calibration error meets the standard specification, report the result as a
percentage of the span even though the result would also pass the alternative specification. Only
when the result does not pass the standard specification, but meets the alternative specification,
should the absolute value of the difference be reported. If the test does not pass either
specification, report the result as a percentage of span.
For CO2 and O2 monitors, the results are always determined using ∗R - A∗ and are expressed in
terms of absolute percent CO2 or O2. Use this method for all diluent gas monitors used for CO2
reporting and/or NOx reporting.
Zero Reference Value
Element Name: ZeroReferenceValue
Report the calibration gas or reference signal value used in this injection. Report the certified
(tag) value of the reference calibration gas, in ppm for SO2 and NOx, or in %CO2 or %O2 for
CO2 and O2. Report the value of the reference signal in the appropriate units, for flow monitors.
Report the value to the precision defined in Table 4. If the daily calibration was not completed
and there was no zero-level injection, leave this field blank.
Upscale Reference Value
Element Name: UpscaleReferenceValue
Report the calibration gas or reference signal value used in this injection. Report the certified
(tag) value of the reference calibration gas, in ppm for SO2 and NOx, or in %CO2 or %O2 for
CO2 and O2. Report the value of the reference signal in the appropriate units for flow monitors.
Report the value to the precision defined in Table 4. If the daily calibration was not completed
and there was no upscale-level injection, leave this field blank.

Table 4

Precision of Reported Values for DAILY CALIBRATION DATA

Parameter Codes
CO2, H2O, NOX, O2, SO2
FLOW

Number of Decimal Places
One
Same as Span Value

Upscale Gas Type Code
Element Name: UpscaleGasTypeCode
For SO2, NOX, CO2, and O2 components, report one of the gas type codes in Table 5 to indicate
the type of gas in the cylinder used for the upscale injection. Note: If you use a blend of EPA
Protocol gases that is not present in this table, you may report a value of "APPVD", but you will
need to contact EPA before submitting the data in order to get permission to use this code.
Leave this field blank if the Component Type Code is FLOW or H2O.

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2.2.1 Daily Calibration Data

Table 5

PGVP Gas Type Codes and Descriptions

Code
SO2
NO
NO2
CO2
O2
SN
SN2
SC
SC2
SO
NX
NC
NC2
N2C
N2C2
OC
OC2
SNX
SNC
SNC2

Description
EPA Protocol gas standard consisting of a single certified component, SO2, and
a balance gas
EPA Protocol gas standard consisting of a single certified component, NO, and
a balance gas
EPA Protocol gas standard consisting of a single certified component, NO2,
and a balance gas
EPA Protocol gas standard consisting of a single certified component, CO2,
and a balance gas
EPA Protocol gas standard consisting of a single certified component, O2, and
a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
SO2 and NO, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
SO2 and NO2, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
SO2 and CO, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
SO2 and CO2, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
SO2 and O2, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
NO and NO2, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
NO and CO, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
NO and CO2, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
NO2 and CO, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components,
NO2 and CO2, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components, O2
and CO, and a balance gas
EPA Protocol gas bi-blend standard consisting of two certified components, O2
and CO2, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
SO2, NO, and NO2, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
SO2, NO, and CO, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
SO2, NO, and CO2, and a balance gas
(cont.)

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Table 5

Gas Type Codes and Descriptions (cont.)

Code
SN2C
SN2C2
SOC
NCC
N2CC
NXC
NXC2
OCC
SNXC
SNXC2
SNCC
SN2CC
NXCC
SNXCC
APPVD
AIR
SRM
NTRM
GMIS
RGM
PRM

Description
EPA Protocol gas tri-blend standard consisting of three certified components,
SO2, NO2, and CO, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
SO2, NO2, and CO2, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
SO2, O2, and CO, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
NO, CO, and CO2, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
NO2, CO, and CO2, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
NO, NO2, and CO, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
NO, NO2, and CO2, and a balance gas
EPA Protocol gas tri-blend standard consisting of three certified components,
O2, CO, and CO2, and a balance gas
EPA Protocol gas quad-blend standard consisting of four certified components,
SO2, NO, NO2, and CO, and a balance gas
EPA Protocol gas quad-blend standard consisting of four certified components,
SO2, NO, NO2, and CO2, and a balance gas
EPA Protocol gas quad-blend standard consisting of four certified components,
SO2, NO, CO, and CO2, and a balance gas
EPA Protocol gas quad-blend standard consisting of four certified components,
SO2, NO2, CO, and CO2, and a balance gas
EPA Protocol gas quad-blend standard consisting of four certified components,
NO, NO2, CO, and CO2, and a balance gas
EPA Protocol gas quint-blend standard consisting of five certified components,
SO2, NO, NO2, CO, and CO2, and a balance gas
Other EPA-approved EPA Protocol gas blend (see note below)
Purified air material
Standard reference material
NIST-traceable reference material
Gas manufacturer’s intermediate standard
Research gas mixture
SRM-equivalent compressed gas primary reference material

Note: If you use a blend of EPA Protocol gases that is not present in this table, you may report a
value of "APPVD", but you will need to contact EPA before submitting the data in order to get
permission to use this code.

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2.2.1 Daily Calibration Data

Cylinder Identifier
Element Name: CylinderIdentifier
For SO2, NOX, CO2, and O2 components, report the vendor-assigned identification or serial number
found on the cylinder used for the upscale injection. Leave this field blank if the Component Type
Code is FLOW or H2O.

Vendor Identifier
Element Name: VendorIdentifier
For an EPA Protocol gas, report the EPA-assigned PGVP Vendor ID of the production site that
supplied the cylinder used for the upscale injection. PGVP Vendor IDs are year specific, therefore
report the assigned PGVP Vendor ID that is applicable on the date the cylinder is certified. An up-to­
date list of PGVP Vendor IDs will be located on the EPA website, and can be accessed via the
ECMPS Support website. Report "NONPGVP" if the cylinder was purchased from a non­
participating vendor prior to 60 days after the rule is published in the FR. Leave this field blank if
the Component Type Code is FLOW or H2O or if the Gas Type Code is AIR, SRM, NTRM, GMIS,
RGM, or PRM.

Expiration Date
Element Name: Expiration Date
For an EPA Protocol gas, SRM, NTRM, GMIS, RGM, or PRM, report the expiration date of the
cylinder used for the upscale injection. Leave this field blank if the Component Type Code is FLOW
or H2O or if the Gas Type Code is AIR, SRM, NTRM, GMIS, RGM, or PRM.

Specific Considerations
Maintenance Procedures
● During maintenance procedures, the calibration gas injections used during those
procedures do not have to be reported if the results of the calibration gas injection do not
indicate that the control status of the monitor has changed. For instance, if a monitoring
system is already out-of-control and calibration gases are injected as part of the
maintenance procedures, the results of these injections do not have to be reported. Only
the results of the post-maintenance calibration error test which is used to validate the
subsequent emissions data must be reported. Similarly, if as part of a maintenance
procedure on one monitor, calibration gases must be injected into other monitors, the
results of these injections do not have to be reported as long as they are within the
calibration error specification. If the results of these injections indicate that any
monitoring system is out-of-control, these injections must be reported and considered to
be a failed calibration error test.
Components Belonging to Multiple Systems
● If a component is part of two (or more) systems (for example, a CO2 analyzer used both
as a primary CO2 monitor and as a diluent monitor in a NOx-diluent monitoring system)
the calibration error test should only be reported once, using the component ID. Data
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validation for each monitoring system which the component is part of will be determined
based on this single test record.
Moisture Monitoring Systems
● For moisture monitoring systems consisting of wet- and dry-basis O2 monitors, report
two calibrations only if the wet and dry readings are obtained from two different
analyzers. Report only the dry-basis O2 calibration when a single analyzer is used for
both wet and dry oxygen.
Flow Monitoring Systems
● For flow monitoring systems comprised of two flow components, perform and report a
daily calibration for each flow component in the system.
Dual Range Monitors
● For dual range monitors, perform and report daily calibrations for the instrument range(s)
used during the day.
Provisions for Conducting Daily Calibration
● Conduct the daily calibration according to the requirements of 40 CFR Part 75,
Appendices A and B. Daily calibrations validate the acceptability of emissions data from
each monitoring component.

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2.3 Daily Emissions Data

2.3 DAILY EMISSIONS DATA
DAILY EMISSIONS DATA XML Model

Figure 6

DAILY EMISSION DATA XML Elements

DAILY EMISSIONS DATA Overview
Description of Data
Submit DAILY EMISSION DATA records to report daily CO2 mass determined using Appendix G
Fuel Sampling and Analysis (FSA) and Equation G-1. Note that this CO2 value is the total mass
emissions for the day, not a daily rate.
DAILY EMISSIONS DATA XML Elements
Instructions for completing each element of the DAILY EMISSION DATA Elements section are
provided below:
Unit ID or Stack Pipe ID
Element Name: UnitID or StackPipeID
Report either the Unit ID or Stack Pipe ID for the daily emissions location. This is the
alphanumeric code assigned by a source to identify a unit or pipe.

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Date
Element Name: Date
Report the date corresponding to the daily emissions.
Parameter Code
Element Name: ParameterCode
Report the parameter code for daily emissions monitoring as CO2M.
Total Daily Emissions
Element Name: TotalDailyEmissions
Report the total CO2 mass emissions for the day in tons. Round to one decimal place.
Total Carbon Burned
Element Name: TotalCarbonBurned
Report the total amount of carbon burned (in lbs) during the day.
Adjusted Daily Emissions
Element Name: AdjustedDailyEmissions
This field applies only to coal-fired units and is optional. Report the adjusted value, in tons, if
adjusting the CO2 mass emissions for carbon content of the flyash. Round to one decimal place.
Leave this field blank if electing not to make an adjustment for the carbon content of the flyash.
Unadjusted Daily Emissions
Element Name: UnadjustedDailyEmissions
Report the unadjusted daily emissions value determined using the G-1 equation.
Sorbent Related Mass Emissions
Element Name: SorbentRelatedMassEmissions
This field is only for units with add-on SO2 emission controls. Report data in this field in tons.

Round to one decimal place.

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2.4 Hourly Operating Data2.3.1 Daily Fuel Data

2.3.1 DAILY FUEL DATA
DAILY FUEL DATA XML Model

Figure 7

DAILY FUEL DATA XML Elements

DAILY FUEL DATA Overview
Description of Data
Submit Daily Fuel Data records to report fuel-specific data used when using Appendix G Fuel
Sampling and Analysis (FSA) and Equation G-1 to determine daily CO2 mass if required to do so
on behalf of the RGGI program.
DAILY FUEL DATA XML Elements
Fuel Code
Element Name: FuelCode
Report the fuel code of a specific fuel used during the day.
Daily Fuel Feed
Element Name: DailyFuelFeed
Report the feed rate of a specific fuel (in lbs) used during the day.
CarbonContent Used
Element Name: CarbonContentUsed
Report the amount of carbon burned as a percentage of the daily feed rate for a specific fuel.
Fuel Carbon Burned
Element Name: FuelCarbonBurned
Report the amount of carbon burned (in lbs) during the day for a specific fuel.

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2.4 HOURLY OPERATING DATA
HOURLY OPERATING DATA XML Model

Figure 8

HOURLY OPERATING DATA XML Elements

HOURLY OPERATING DATA Overview
Description of Data

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2.4 Hourly Operating Data

Report an HOURLY OPERATING DATA record for every clock hour of the reporting period for
every unit, stack, and pipe in the monitoring configuration represented by this emissions file.
(You must report these records even for non-operating quarters.) Report an HOURLY OPERATING
DATA record for every clock hour, as follows: (a) for each affected unit, irrespective of the
location(s) at which the emissions are measured; and (b) for each common stack (or pipe) or
multiple stack (or pipe) location at which emissions are measured.
For example, if common stack CS1 serves Units 1 and 2 and emissions are monitored at the
common stack, report HOURLY OPERATING DATA for the common stack and also report HOURLY
OPERATING DATA for each unit. As a second example, if Unit 1 discharges through two stacks,
MS1 and MS2, and emissions are monitored at each stack, report separate HOURLY OPERATING
DATA for each stack and also report HOURLY OPERATING DATA for Unit 1.
If a common stack serves Units 1, 2, and 3, but Unit 1 did not operate during the quarter, report
HOURLY OPERATING DATA for every clock hour in the quarter for Unit 1 with 0.00 as the
operating time and leave the remaining fields blank. The HOURLY OPERATING DATA records for
Units 2 and 3 will contain the appropriate operating data.
HOURLY OPERATING DATA XML Elements

Unit ID or Stack Pipe ID

Element Name: UnitID or StackPipeID
Report either the Unit ID or Stack Pipe ID for the HOURLY OPERATING DATA. This is the

alphanumeric code assigned by a source to identify a unit, stack, or pipe.

Date
Element Name: Date
Report the date corresponding to the data being reported.
Hour
Element Name: Hour
Report the hour corresponding to the data being reported.
Operating Time
Element Name: OperatingTime
Report the fraction of the clock hour during which the unit combusted any fuel (or the fraction of
the clock hour during which the stack or pipe was used). You may use any equal increments
from hundredths (0.01 hr) to quarters (0.25 hr) of an hour.
If the unit, stack, or pipe did not operate, report "0.00." For common stack and multiple stack
configurations, report an operating time of "0.00" in the HOURLY OPERATING DATA record for
any clock hour in which none of the units that exhaust through a particular stack are operating or
for any clock hour in which the dampers are closed so that flue gas is unable to pass through the
stack.
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If you elect to use a multiple-stack configuration to report NOx emissions data from a combinedcycle combustion turbine that: (a) uses Appendix D to measure the unit-level heat input; and (b)
has a NOx-diluent monitoring system installed on each stack (i.e., on the main stack and the
bypass stack), report the stack operating times as follows:
● For any hour in which all of the exhaust gases flow through one stack or the other, the
operating time for the stack that is in use will be equal to the unit operating time for that
hour, and the operating time for the other stack will be 0.00; and
● For a transition hour, in which gases flow through both stacks during the entire hour or
any part of the hour:
-- Report that fraction of the hour (if any) in which gases flow only through the main
stack as the "main stack operating time;" and
-- Report the remainder of the hour in which gases either flow through both stacks
simultaneously or flow only through the bypass stack as the "bypass stack operating
time."
Operating Time for LME Units
Report the fraction of the clock hour during which the unit combusted any fuel (or the fraction of
the clock hour during which the stack or pipe was used).
Report a unit operating time of "0.00" for any clock hour in which the unit did not operate.
Hour Load
Element Name: HourLoad
Report hourly load information as either steam load or gross unit load. The units for average
hourly gross unit load are to be reported in megawatts of electrical generation or in either 1,000
lbs/hr or mmBtu/hr of steam generation. Note that this value represents an hourly rate and not
the total load for the hour. Do not correct steam load for standard temperature and pressure; use
steam load at measured temperature and pressure (see Part 75, Appendix C, Section 2.2.1).
If you convert auxiliary heat input to the megawatts equivalent (e.g., for a heat recovery steam

generator with a duct burner) and add that value to megawatts for a gas turbine, you should

report the unit electric load in megawatts.

For all multiple-stack configurations, for each unit operating hour in which gases flow through a
particular stack or duct, report the unit load in both the stack-level and unit-level HOURLY
OPERATING DATA records for that hour.

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2.4 Hourly Operating Data

For monitored common stacks, report the weighted sum of the hourly unit loads for all units that
exhaust through the stack, according to the following formula:
∑ (Loadu x OpTimeu)
Weighted Load = ---------------------------OpTimecs
Leave this element blank (do not report zeros) for any clock hour in which the unit, stack, or pipe
did not operate. Also leave this element blank for units that do not produce electrical or steam
load (e.g., cement kilns, refinery process heaters, etc.).
Load Units of Measure Code
Element Name: LoadUnitsOfMeasureCode
Report the appropriate code to identify the load units of measure.

Table 6

Load Units of Measure Codes and Descriptions

Code

Description

MW

Megawatt

KLBHR

1,000 Pounds Steam Load per Hour

MMBTUHR

Steam Load in mmBtu per Hour

Leave this element blank for any clock hour in which the unit, stack, or pipe did not operate.
Also leave this element blank for units that do not produce electrical or steam load (e.g., cement
kilns, refinery process heaters, etc.).
Load Range
Element Name: LoadRange
Report an operating load range (load bin number) for each operating hour (see Appendix C to
Part 75) for units that produce electrical or steam load. For units that do not produce electrical or
steam load (e.g., cement kilns, refinery process heaters, etc.), report the operational bin number,
if operational bins are used for missing data purposes. If the operational bin number is
indeterminable, report "0."
For a monitored common stack, the load bins are defined at the common stack on the basis of
combined unit load, and load-based missing data routines are applied at the common stack.
Therefore for each unit operating hour, report the common stack load bin number in both the
common stack and unit-level HOURLY OPERATING DATA records.
For a multiple-stack configuration in which gases normally flow through both stacks or ducts
simultaneously (e.g., a twin-stack or split-breeching configuration), the load bins are set up on

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the basis of unit load. Therefore, for each unit operating hour, report the unit load bin number in
both the unit-level and stack-level HOURLY OPERATING DATA records.
For load-based units, leave this element blank (do not report zeros) for any clock hour in which
the unit does not operate or gases do not flow through the stack (as applicable). Also leave this
element blank for non load-based units that do not use operational bins for missing data purposes
and for LME units.
Common Stack Load Range
Element Name: CommonStackLoadRange
For a common stack with installed stack flow monitor, if you have elected to establish 20 load

bins for missing data substitution purposes, report the appropriate load bin number using this

element. Note that this is an optional alternative to the standard load range.

Fc Factor
Element Name: FcFactor
If any emissions calculations at this location require use of the carbon-based F-factor, report the
appropriate Fc-factor value corresponding to the fuel(s) burned during the hour.
Fd Factor
Element Name: FdFactor
If any emissions calculations at this location require use of the dry-basis F-factor, report the

appropriate Fd-factor value corresponding to the fuel(s) burned during the hour.

Fw Factor
Element Name: FwFactor
If any emissions calculations at this location require use of the wet-basis F-factor, report the

appropriate Fw-factor value corresponding to fuel(s) burned during the hour.

Fuel Code
Element Name: FuelCode
You must report data in this field if: (1) you have elected to use the fuel-specific continuous

emissions monitoring system (CEMS) missing data option under §75.33; or (2) you have an

exhaust configuration consisting of a monitored main stack and an unmonitored bypass stack,

and you opt to report the fuel-specific Maximum Potential Concentration (MPC) or maximum

potential NOx emission rate (MER) value during bypass hours (see §§75.16, 75.17 and 75.72).

Otherwise, reporting data in this field is optional. Select one Fuel Code shown in Table 7.

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2.4 Hourly Operating Data

Table 7

Fuel Codes and Descriptions

Code

Description

MIX

Use this code for any hour in which fuels are co-fired

BFG

Blast Furnace Gas

BUT

Butane (if measured as a gas)

C

Coal

CDG

Coal-Derived Gas

COG

Coke Oven Gas

CRF

Coal Refuse (culm or gob)

DGG

Digester Gas

DSL

Diesel Oil

LFG

Landfill Gas

LPG

Liquefied Petroleum Gas (as defined in §72.2)

NNG

Natural Gas

OGS

Other Gas

OIL

Residual Oil

OOL

Other Oil

OSF

Other Solid Fuel

PDG

Producer Gas

PNG

Pipeline Natural Gas (as defined in §72.2)

PRG

Process Gas

PRP

Propane (if measured as a gas)

PRS

Process Sludge

PTC

Petroleum Coke

R

Refuse

RFG

Refinery Gas

SRG

Unrefined Sour Gas

TDF

Tire-Derived Fuel

W

Wood

WL

Waste Liquid

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2.4.1 MONITOR HOURLY VALUE DATA
MONITOR HOURLY VALUE DATA XML Model

Figure 9

MONITOR HOURLY VALUE DATA XML Elements

MONITOR HOURLY VALUE DATA Overview
Description of Data
Use the MONITOR HOURLY VALUE DATA (MHV) record to report each value measured by a
continuous emissions or stack flow monitoring system (or, if applicable, the missing data
substitution value for the parameter). The monitored emission values can include SO2
concentration, NOx concentration, CO2 concentration, O2 concentration, H2O concentration
(moisture), and volumetric flow. These instructions contain subsections of each measured
parameter, to give specific stipulations on how to report for that particular parameter.
SO2 Concentration
If you use continuous emissions monitoring systems (CEMS) to determine SO2 mass emissions,
report SO2 concentration in an MHV record for each hour or partial hour of unit operation, with
one exception: do not report an MHV record for hours in which only gaseous fuel is combusted,
if you account for SO2 mass emissions during those hours using the provisions of §75.11(e)(1) in
lieu of operating and recording data from the SO2 monitoring system.
Volumetric Flow
If you use stack flow monitoring to determine hourly heat input rate or SO2, CO2, or NOx mass
emissions, report volumetric flow in an MHV record for each operating hour or partial operating
hour.
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2.4.1 Monitor Hourly Value Data

Table 8, below, summarizes which elements to report for SO2C and FLOW MHV records.

Table 8

MHV Elements for SO2C or Flow

SO2C or Flow
MHV Elements to Report

Measured Data

Missing Data

Parameter Code





Unadjusted Hourly Value



Adjusted Hourly Value





Method of Determination Code (MODC)





Monitoring System ID



Component ID



Percent Available





Moisture Basis

NOx Concentration
If you use a NOx-diluent monitoring system to determine and report the NOx emission rate
and/or a NOx concentration monitor in conjunction with Stack Flow to determine NOx mass,
report an MHV record, as follows, for NOXC for each unit or stack operating hour as needed for
those determinations.
(a) Monitoring locations with only a NOx-diluent monitoring system:
Report the NOXC MHV record only for hours in which a quality-assured NOx
concentration is available and a quality-assured diluent gas (CO2 or O2) concentration is
available. (Whenever either the NOx concentration or diluent concentration is missing
for an hour, report the appropriate substitute data value for NOx emission rate in the
DERIVED HOURLY VALUE (DHV) record and do not report an MHV record.)
The elements to report for (a) are summarized in Table 9.

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Table 9

MHV Elements for NOXC Record -- NOX Rate System Only

NOXC MHV Record
MHV Elements to Report

Measured Data

Missing Data

Parameter Code



NA

Unadjusted Hourly Value



NA

Adjusted Hourly Value
MODC

NA


NA

Monitoring System ID
Component ID

NA


NA

Percent Available

NA

Moisture Basis

NA

(b) Monitoring locations with only a NOx concentration monitoring system:
Report the NOXC MHV record for every operating hour. If a valid NOx concentration is
not obtained for the hour, report substitute data in the Adjusted Hourly Value element of
the record using the applicable missing data procedures for NOXC.
(c) Monitoring locations with both a NOx-diluent and a NOx concentration monitoring
system:
Report the NOXC MHV record for every operating hour using the Monitoring System ID
for the NOx concentration monitoring system. If a valid NOx concentration is not
obtained for the hour, report the applicable substitute NOx concentration data in the MHV
record using the applicable missing data procedures for NOXC; and report the
appropriate substitute data value for NOx emission rate in the DHV record.
The elements to report for (b) and (c) are summarized in Table 10 below.

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2.4.1 Monitor Hourly Value Data

Table 10

MHV Elements for NOXC Record -- NOXC System

NOXC MHV Record
MHV Elements to Report

Measured Data

Missing Data

Parameter Code





Unadjusted Hourly Value



Adjusted Hourly Value





MODC





Monitoring System ID

1

Component ID



Percent Available





Moisture Basis
1

Report the NOXC System ID.

Note that for units with add-on NOx emission controls, hours in which the flue gases are
discharged through an unmonitored bypass stack are considered to be missing data hours.
However, when the outlet NOx monitor is unavailable and proper operation of the emission
controls is not verified, §75.34 (a)(1) allows you to report data from a certified NOx monitor at
the control device inlet. If you choose this option, these hours are treated as "available" hours for
the purposes of the missing data lookbacks and percent monitor data availability (PMA)
calculations.
For a summary of these requirements, see Table 11 below.
Reporting of High Range and Full Scale Exceedance Defaults
Treat any hour(s) in which a default high range value (200 percent of Maximum Potential
Concentration (MPC)) or a full scale exceedance value (200 percent of range) is used in the
calculation of the hourly average NOx concentration as follows:
(a) For NOx concentration monitoring systems:
Treat these hours as quality-assured monitor operating hours and include them in missing
data lookback and as available hours for percent monitor data availability calculations.

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(b) For NOx-diluent monitoring systems:
1. If a quality-assured diluent value is available for the hour, treat the hour as qualityassured data and use the appropriate NOx concentration value in conjunction with the
quality-assured average diluent gas concentration for the hour to calculate and report
NOx emission rate in the DHV record.
2. If a quality-assured diluent gas concentration is not available for the hour, then
consider the NOx emission rate data for the hour to be missing and do not report any
MHV record for the hour. Instead, report the maximum potential NOx emission rate
(MER) as a substitute data value in a DHV record using an MODC of 25.
(c) Where both NOx concentration and NOx-diluent monitoring systems are identified:
1. If a quality-assured diluent value is available for the hour, treat the hour as a qualityassured monitor operating hour and include it in the missing data lookback and as an
available hour for percent monitor data availability calculations. Also, use the NOx
concentration value in conjunction with the quality-assured average diluent gas
concentration for the hour to calculate and report NOx emission rate in the DHV
record.
2. If a quality-assured diluent gas concentration is not available for the hour, treat the
hour as a quality-assured monitor operating hour for NOXC and include it in the
missing data lookback for NOXC and as an available hour for percent monitor data
availability calculations for the NOXC system. However, the NOx emission rate data
for the hour is considered to be missing. Report the MER as a substitute data value in
a DHV record using an MODC of 25.

Table 11
Summary of NOx MONITOR HOURLY VALUE Record Reporting Requirements

Use of NOx Analyzer
For NOx emission rate only

Monitoring System
ID Used
Blank

Missing Data Instructions
Do not report an MHV record for the hour.
Perform NOx missing data substitution in
DHV record (if NOx or diluent
concentration is unavailable).

For NOx mass calculation using NOx concentration
NOx concentration x stack flow monitoring System ID

Perform missing data substitution for NOx
concentration in an MHV record.

Both NOx emission rate and
NOx mass calculation using
NOx concentration x stack flow

Perform missing data substitution for NOx
concentration in an MHV record. Also
perform missing data substitution in the
DHV record for NOx emission rate if either
the NOx or diluent concentration is missing.

Environmental Protection Agency

NOx concentration
monitoring System ID

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2.4.1 Monitor Hourly Value Data

CO2 Concentration
Report a MHV record for CO2 Concentration only if you use a CO2 analyzer to determine CO2
concentration. If you use an O2 concentration monitor and Equation F-14a or F-14b to determine
CO2 concentration for each hour, report a MHV record for O2 concentration for the hour (see the
instructions for O2 Concentration below) and report the calculated CO2 concentration in a DHV
record.
If you use a CO2 analyzer reading to calculate NOx emission rate, CO2 mass emission rate, and/or
Heat Input, report a MHV record for CO2C for each unit or stack operating hour as needed for
those determinations.

Table 12

MHV Elements for CO2C

CO2C MHV Records
Measured Data

Missing Data3

Parameter Code





Unadjusted Hourly Value









MHV Elements to Report

Adjusted Hourly Value
MODC
Monitoring System ID
Component ID
Percent Available

1


2



Moisture Basis
1

If the CO2 component is part of a CO2 system, report the CO2 System ID. Otherwise, leave the System
ID blank.

2

If the CO2 is used to calculate heat input or CO2 mass rate, report the Percent Available value for every
operating hour.

3

If the CO2 value is used to calculate heat input or CO2 mass rate, report an MHV record for CO2C for
every operating hour. Otherwise, do not report CO2C MHV records for missing data hours.

(a) Whenever you use a CO2 monitor to determine CO2 mass emissions and/or for heat
input rate:
Report a MHV record using the CO2 Monitoring System ID, for each hour or partial
hour of unit operation. When the hourly CO2 concentration is missing, or for hours in
which the flue gases are discharged through an unmonitored bypass stack, use the
missing data routines in §75.35 and 75.36 to provide substitute data values.

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If the CO2 monitor is also used as the diluent monitor for a NOx-diluent monitoring
system, whenever a CO2 RATA is failed on the CO2 monitoring system, then both the
CO2 and NOx-diluent monitoring systems are considered out-of-control. (See Appendix
B §2.3.2(g)). Report the applicable substitute CO2 concentration data in the MHV
record using the applicable missing data procedures for CO2C. For NOx emission rate,
report the appropriate substitute data value in the DHV record.
However, if the CO2 data for the CO2 monitoring system is considered out-of-control
due to the expiration of the applicable CO2 RATA but the NOx RATA has not yet
expired, 1 then substitute data should only be used for CO2 mass and heat input rate
calculations and not for calculation of the NOx emission rate. For NOx emission rate, the
actual measured CO2 concentration should be used. In such cases, report two CO2
concentrations for each hour until a CO2 RATA is completed. First, report the
appropriate substitute CO2 data using the CO2 System ID. Second, report the actual CO2
value recorded by the CO2 component, leaving the System ID blank. (The actual CO2
value will be used in the NOx emission rate calculation for the hour, while the substitute
data value will be used in the CO2 mass and heat input rate calculations.)
(b) If you use the CO2 monitor only to calculate NOx emission rate:
Report an MHV record for CO2 concentration. Leave the Monitoring System ID blank.
Do not report an MHV record for the hour if: (1) a quality-assured CO2 concentration is
not available; or (2) a quality-assured NOx concentration is not available; or (3) both (1)
and (2). Instead, report a substitute data value for NOx emission rate in the DHV record.
Note that hours in which the flue gases are discharged through an unmonitored bypass
stack are considered to be missing data hours. For these hours, do not report a MHV
record. In the DHV record, report the NOx MER and MODC of "23."
When a default high range value (200 percent of MPC) or a full-scale exceedance value
(200 percent of the range) is used in the calculation of the hourly average NOx
concentration, the NOx concentration is considered to be both quality-assured and
available. Therefore, if a quality-assured CO2 concentration is available for that hour,
report a MHV record and calculate the NOx emission rate in the usual manner.
However, if a quality-assured CO2 concentration is not available for that hour, the NOx
emission rate data for the hour are considered missing. In that case, do not report a
MHV record for the hour and report the maximum potential NOx emission rate (MER)
as a substitute data value in DHV record, using an MODC of "25."
O2 Concentration
Report an MHV record for O2 concentration for each hour in which you use the O2 concentration
to determine the hourly NOx emission rate, heat input rate, or CO2 concentration. Report two
MHV records for O2 concentration (one wet-basis and one dry-basis) for each hour in which you
use O2 concentration to determine percent moisture.
1

Note that this situation should only arise if the NOx emission rate RATA was done using O2 as the diluent for the
reference method or if the CO2 RATA data are not submitted. If the RATA was conducted using a CO2 diluent in
the reference method, then there should be sufficient CO2 data available to submit a RATA for the CO2 system.

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2.4.1 Monitor Hourly Value Data

If the O2 value is used for the heat input calculation, report the MHV record for O2 for every
operating hour and use the appropriate substitute data for any operating hour in which a qualityassured O2 value in not obtained. Otherwise, report the MHV record only for hours in which a
quality-assured O2 value is obtained.

Table 13

MHV Elements for O2C

O2C MHV Records
Measured Data

Missing Data4

Parameter Code





Unadjusted Hourly Value









MHV Elements to Report

Adjusted Hourly Value
MODC
Monitoring System ID
Component ID

1



Percent Available

2

Moisture Basis

3



1

If the O2 component is part of a CO2 system, report the CO2 System ID. If the O2 component is part of
an O2 system, report the O2 System ID. Otherwise, leave the System ID blank.

2

If the O2 value is used to calculate heat input, report the Percent Available value for every operating
hour.

3

If the O2 value is used to calculate H2O, report the Moisture basis. Otherwise, leave this field blank.

4

If the O2 value is used to calculate heat input, report an MHV record for O2C for every operating hour.
Otherwise, do not report O2C MHV records for missing data hours.

(a) Whenever you use an O2 monitor to determine CO2 concentration, CO2 mass emissions,
and/or for heat input rate (as part of a CO2 monitoring system):
Report an MHV record using the CO2 Monitoring System ID, for each hour or partial
hour of unit operation in which a quality-assured O2 value is obtained. When the hourly
O2 concentration is missing, or for hours in which the flue gases are discharged through
an unmonitored bypass stack, use the missing data routines in §75.36 to provide
substitute data values if the O2 value is used to determine heat input.
If the O2 monitor is also used as the diluent monitor for a NOx-diluent monitoring
system, whenever a CO2 RATA is failed on the CO2 monitoring system, then the CO2,
and NOx-diluent monitoring systems (as applicable) are each considered to be out-of­
control. (See Appendix B §2.3.2(g).) If heat input is calculated from the O2, report the
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2.4.1 Monitor Hourly Value Data

March 07, 2012September 19, 2012

applicable substitute O2 concentration data in the MHV record using the applicable
missing data procedures for O2C. For CO2 concentration, CO2 mass, and NOx emission
rate, report the appropriate substitute data values in the appropriate DHV records.
However, if the O2 data for the CO2 monitoring system is considered out-of-control due
to the expiration of the applicable CO2 RATA but the NOx RATA has not yet expired, 2
then substitute data should only be used for CO2 concentration and heat input rate
calculations and not for calculation of the NOx emission rate. The actual measured O2
concentration should be used to calculate NOx emission rate. In such cases, report two
O2 concentrations for each hour until a CO2 RATA is completed. First, report the
appropriate substitute O2 data using the CO2 system. Second, report the actual O2 value
recorded by the O2 component, leaving the System ID blank. (The monitor O2 value
will be used in the NOx emission rate calculation for the hour, while the substitute data
value will be used in the heat input rate calculation.)
(b) Whenever you use an O2 monitoring system to determine heat input rate:
Report an MHV record using the O2 Monitoring System ID, for each hour or partial hour
of unit operation. When the hourly O2 concentration is missing, or for hours in which
the flue gases are discharged through an unmonitored bypass stack, use the missing data
routines in §75.36 to provide substitute data values.
If the O2 monitor is also used as the diluent monitor for a NOx-diluent monitoring
system, whenever O2 RATA is failed for the O2 monitoring system, then the NOx-diluent
monitoring systems is also considered to be out-of-control. (See Appendix B §2.3.2(g).)
For heat input that is calculated from the O2, report the applicable substitute O2
concentration data in the MHV record using the applicable missing data procedures for
O2C. For NOx emission rate, report the appropriate substitute data values in the
appropriate DHV record. However, if the O2 data for the O2 monitoring system is
considered out-of-control due to the expiration of the applicable O2 RATA but the NOx
RATA has not yet expired, 3 then substitute data should only be used for calculating heat
input rate and not for calculation of the NOx emission rate. The actual measured O2
concentration should be used to calculate NOx emission rate. In such cases, report an
additional O2 concentration record for each hour until an O2 RATA is completed. First,
report the appropriate substitute O2 data using the O2 System ID. Secondly, report the
actual O2 value recorded by the O2 component leaving the System ID blank. (The
recorded O2 value will be used in the NOx emission rate calculation for the hour, while
the O2C substitute data value will be used in the heat input rate calculations.)
(c) If the O2 value is used only for calculating NOx emission rate, then report the MHV
record for O2 only when quality-assured values are obtained for both O2 and NOx
concentration. Leave the System ID blank. Note that hours in which the flue gases are
discharged through an unmonitored bypass stack are considered to be missing data
2

Note that this situation should only arise if the NOx emission rate RATA was done using O2 as the diluent for the
reference method or if the CO2 RATA data are not submitted. If the RATA was conducted using a CO2 diluent in
the reference method, then there should be sufficient CO2 data available to submit a RATA for the CO2 system.

3

Note that this situation should only arise if the NOx emission rate RATA was done using CO2 as the diluent for the
reference method or if the O2 RATA data are not submitted. If the RATA was conducted using an O2 diluent in
the reference method, then there should be sufficient O2 data available to submit a RATA for the O2 system.

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2.4.1 Monitor Hourly Value Data

hours. (For these hours, do not report an MHV record. In the DHV record, report the
NOx MER and an MODC of "23.")
(d) If you also use wet and dry O2 monitors to determine the hourly percent moisture:
Report two O2 MHV records for each hour. Report the wet O2 measurement with a "W"
as the Moisture Basis data element and report the dry O2 measurement with a "D" as the
Moisture Basis data element. If either the wet or dry O2 component is also used to
calculate heat input, NOx emission rate, and/or CO2 concentration, then follow the
applicable reporting instructions from sections (a), (b), or (c), above, to report the data
for that component. For the remaining component, report the MHV for each hour, and
leave the System ID blank.
If either O2 value is missing, or for hours in which the flue gases are discharged through
an unmonitored bypass stack, perform missing moisture data substitution in the DHV
record for moisture, in accordance with §75.37.
Moisture (H2O)
For any unit or stack that monitors H2O with a moisture sensor (or, for saturated gas streams,

from a temperature sensor and look-up table), report the moisture value in a moisture MHV

record for each operating hour or partial operating hour.

Table 14

MHV Elements for H2O

H2O
MHV Elements to Report

Measured Data

Missing Data

Parameter Code





Unadjusted Hourly Value





MODC





Monitoring System ID



Component ID



Percent Available



Adjusted Hourly Value



Moisture Basis

If you use a fuel-specific default moisture value, as allowed under §75.11 or §75.12 (for coal,
wood, and natural gas burning units only), report the value in the MONITOR DEFAULT DATA
record and use this constant in the calculation. Do not report a moisture MHV record on an
hourly basis. However, if you have more than one active fuel-specific default moisture value

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defined in your monitoring plan, report the fuel-specific or pro-rated moisture value used in your
emissions calculations in an H2O DHV record.
The Part 75 missing data procedures for moisture are found in §75.37. These procedures are

modeled after the standard missing data procedures for SO2. In most instances, the moisture

missing data algorithm is the inverse of the SO2 algorithm (i.e., the lower moisture values are

more conservative and therefore an inverted moisture missing data algorithm must be applied

(using 10th percentile values instead of 90th percentile values, minimum values instead of

maximum values, etc.)). However, when Equations 19-3, 19-4, or 19-8 from Method 19 of 40

CFR Part 60 are used to determine NOx emission rate, a higher moisture value is more

conservative and therefore the standard SO2 missing data algorithm must be applied.

MONITOR HOURLY VALUE DATA XML Elements
Parameter Code
Element Name: ParameterCode
Report the Parameter Code that corresponds to the parameter monitored at the location defined

by the Stack Pipe ID or Unit ID. Use the appropriate uppercase code as shown in Table 15.

Table 15

Parameter Codes and Descriptions for the MHV DATA Record

Code

Description

CO2C

CO2 Concentration (%, pct)

FLOW

Volumetric Flow Rate (scfh)

H2O

Moisture (using moisture sensors, or temperature sensors)
(%, pct)

NOXC

NOx Concentration (ppm)

O2C

O2 Concentration (%, pct)

SO2C

SO2 Concentration (ppm)

Unadjusted Hourly Value
Element Name: UnadjustedHourlyValue
Report the unadjusted concentration or stack flow value for the hour. See below for parameterspecific instructions.
SO2 Concentration
Report the unadjusted, quality-assured SO2 concentration for the hour, expressed in parts per
million (ppm) and round the resulting value to the appropriate number of decimal places per
Table 16. Leave this field blank for hours in which you use substitute data.

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2.4.1 Monitor Hourly Value Data

Leave this field blank for hours in which the flue gases are routed through an unmonitored
bypass stack, or when the outlet SO2 monitor is unavailable and proper operation of the emission
controls is not verified, if you report the MPC for those hours. However, if you report data from
a certified inlet monitor during those hours, report the unadjusted SO2 concentration recorded by
the monitor.
Do not leave this field blank for hours in which: (1) very low sulfur fuel is combusted and you

report a 2.0 ppm default value; or (2) you use the default high range value of 200 percent of the

MPC in the calculation of the hourly SO2 concentration; or (3) a full-scale exceedance occurs

and you use 200 percent of the range in the calculation of the hourly SO2 concentration. All of

the hours described in (1) – (3), above, are treated as quality-assured monitor operating hours.

NOx Concentration
For both NOx concentration monitoring systems and NOx-diluent monitoring systems, report the
unadjusted, quality-assured NOx concentration for the hour, expressed in parts per million (ppm)
and round the resulting value to the appropriate number of decimal places per Table 16. Leave
this field blank for hours in which you use substitute data for NOx concentration.
Do not leave this field blank for hours in which: (1) you use a default high range value of 200

percent of the MPC in the calculation of the hourly NOx concentration; or (2) a full-scale

exceedance occurs and you use 200 percent of the range in the calculation of the hourly NOx

concentration. All of the hours described in (1) and (2), above are treated as quality-assured

monitor operating hours. Refer to the Part 75 Emissions Monitoring Policy Manual for further

discussion of overscaling and use of the default high range.

For units with add-on NOx emission controls, if you report data from a certified control device

inlet monitor during hours in which the outlet NOx monitor is unavailable and proper operation

of the emission controls is not verified, report the average, unadjusted NOx concentration

recorded by the inlet monitor.

CO2 Concentration
Report the CO2 concentration for the hour, expressed in percent CO2 (%CO2) and round the
resulting value to the appropriate number of decimal places per Table 16. If applicable, during
hours in which you use substitute data, or for hours in which the flue gases are discharged
through an unmonitored bypass stack, report the substituted value obtained from the CO2 missing
data procedures under §§75.35 or 75.36 (as applicable). If applicable for NOx emission rate
calculations, for each hour in which you use the diluent cap value to calculate NOx emission rate,
report the actual quality-assured CO2 concentration in MHV record for CO2C and appropriate
MODC ("01" through "04"), and report an MODC of "14" in the DHV record for NOx emission
rate.
Whenever it is necessary to report a second CO2 concentration record to calculate NOx emission
rate for an hour, report the actual CO2 concentration for the hour and the appropriate MODC
(either "01" or "02"). See instructions under Description of Data for CO2 Concentration.

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O2 Concentration
Report O2 concentration for the hour, expressed in %O2, and round the resulting value to the
appropriate number of decimal places per Table 16. For each hour in which you use the diluent
cap value to calculate NOx emission rate, report the actual quality-assured O2 concentration and
appropriate MODC ("01" through "04"). For each such hour, report an MODC of "14" in the
NOx emission rate DHV record, to indicate that the diluent cap is being used for NOx emission
rate.
For any hour in which there is a full scale exceedance of the O2 monitor range, report the
appropriate diluent cap value for the type of unit and an MODC of "20." You must also report a
default record in the monitoring plan with a parameter code of O2X and a Default Purpose Code
of "DC" containing this value even if you do not calculate an hourly NOx Emissions Rate. (Note
that you may instead report a time weighted average calculated using the diluent cap value for
the portion of the hour that the monitoring range was exceeded with the quality assured data
collected during the portion of the hour when the range was not exceeded. In this case, report the
hourly average but use an MODC of "20" to indicate a range exceedance has occurred during the
hour.)
If you use wet and dry O2 monitors to determine the hourly percent moisture and both values are
quality-assured, report two O2 MHV records for each hour.
If you use O2 concentration for the heat input rate calculation, report the appropriate substitute
data value in this field when a quality-assured O2 concentration for the hour is unavailable or for
hours in which the flue gases are discharged through an unmonitored bypass stack. Otherwise, if
a quality-assured O2 concentration is not obtained, do not report an MHV record for the hour.
Moisture
Report moisture for the hour, expressed in %H2O, and round the resulting value, obtained either
from a moisture sensor, or for saturated gas streams, from a temperature sensor and look-up
table, to the appropriate number of decimal places per Table 16. Report the appropriate
substitute data value for hours in which a quality-assured moisture percentage is unavailable or
for hours in which the flue gases are discharged through an unmonitored bypass stack.
Volumetric Flow
For each operating hour (or partial operating hour) in which a quality-assured flow rate was

measured (MODC "01" through "04" and "54"), report the unadjusted flow rate in units of scfh

(wet-basis). Report flow rate to the appropriate number of decimal places per Table 16. For

missing data hours, leave this field blank (this includes hours in which the flue gases are

discharged through an unmonitored bypass stack).

If a start-up or shut-down hour results in a stack flow rate that is too low to be registered by the
stack flow monitor, you may report a default minimum stack flow rate of 1,000 scfh. Report an
MODC of "55" for the hour. Manual entry of this MODC is permitted.

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2.4.1 Monitor Hourly Value Data

Adjusted Hourly Value
Element Name: AdjustedHourlyValue
Leave this field blank for parameters CO2C, H2O, and O2C.
SO2 Concentration
For each hour in which you obtain quality-assured values, apply the appropriate bias adjustment
factor (BAF) to the rounded average SO2 concentration for the hour. Report the adjusted SO2
concentration for the hour in ppm and round the resulting value to the appropriate number of
decimal places per Table 16.
Note that for an initial certification, analyzer replacement, or complete monitoring system
replacement (as indicated by reporting a QA AND CERTIFICATION EVENT record with a
QACertificationEventCode value of "100," "101," "120," or "125"), if you are using conditional
data validation, the BAF is uncertain during the conditional data period. Therefore, apply a BAF
of 1.000 from the beginning of the conditional data validation period to the completion hour of
the certification or recertification RATA.
For each hour in which you use missing data procedures, report the substitute data value.
For each hour in which the flue gases are routed through an unmonitored bypass stack, or when
the outlet SO2 monitor is unavailable and proper operation of the emission controls is not
verified, you may either report the MPC in this field or, if data are available from a certified inlet
monitor, report the bias-adjusted SO2 concentration measured by the monitor.
For each hour in which only very low sulfur fuel (as defined in §72.2) is combusted, report the

bias-adjusted hourly average SO2 concentration, unless it is less than 2.0 ppm, in which case,

report "2.0 ppm."

For each hour in which a default high range value is used in the calculation of the hourly average
SO2 concentration, report the bias-adjusted hourly average in this field unless application of the
BAF causes the hourly average to exceed 200 percent of the MPC, in which case, report 200
percent of the MPC.
When a full-scale exceedance of the high range occurs and 200 percent of the range is used in the
calculation of the hourly average SO2 concentration, report the bias-adjusted hourly average in
this field unless application of the BAF causes the hourly average to exceed 200 percent of the
range, in which case, report 200 percent of the range.
Refer to the Part 75 Emissions Monitoring Policy Manual for a further discussion of overscaling
and use of the default high range value.
NOx Concentration
Report data in this field only if you use NOx concentration times stack flow rate to determine

NOx mass emissions. Leave this field blank if you do not have a NOx concentration system.

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For each hour in which you obtain a quality-assured value, apply the appropriate adjustment
factor (1.000 or system BAF) to the rounded average NOx concentration for the hour. Report the
adjusted average NOx concentration for the hour in ppm and round the resulting value to the
appropriate number of decimal places per Table 16.
Note that for an initial certification, analyzer replacement, or complete monitoring system
replacement (as indicated by reporting a QA AND CERTIFICATION EVENT record with a
QACertificationEventCode value of "100," "101," "120," or "125"), if you are using conditional
data validation, the BAF is uncertain during the conditional data period. Therefore, apply a BAF
of 1.000 from the beginning of the conditional data validation period to the completion hour of
the certification or recertification RATA.
For each hour in which NOx concentration is missing, report the substitute NOx concentration

value.

For each hour in which a default high range value is used in the calculation of the hourly average
NOx concentration, report the bias-adjusted hourly average in this field, unless it exceeds 200
percent of the MPC, in which case, report 200 percent of the MPC.
When a full-scale exceedance of the high range occurs and 200 percent of the range is used in the
calculation of the hourly average NOx concentration, report the bias-adjusted hourly average in
this field, unless it exceeds 200 percent of the range, in which case, report 200 percent of the
range.
For units with add-on NOx emission controls, if you report data from a certified NOx monitor at

the control device inlet during hours in which the outlet NOx monitor is unavailable and proper

operation of the emission controls is not verified, report the average, bias-adjusted NOx

concentration recorded by the monitor. Include these hours in the missing data lookbacks and

treat them as available hours in the PMA calculations.

Volumetric Flow
For hours in which quality-assured data are obtained, apply the appropriate bias adjustment
factor (1.000 or BAF) to the rounded quality-assured value and report the adjusted stack flow for
the hour. Report the resulting value to the appropriate number of decimal places per Table 16.
For each hour in which missing data procedures are used to report data, report the substitute data
value. When the flue gases are discharged through an unmonitored bypass stack, report the
appropriate substitute data value for flow rate (under §75.33) in this field. Do not leave this field
blank.
Note that for an initial certification, analyzer replacement, or monitoring system replacement (as
indicated by reporting a QA AND CERTIFICATION EVENT record with a
QACertificationEventCode value of "300" or "305"), if you are using conditional data validation,
the BAF is uncertain during the conditional data period. Therefore, apply a BAF of 1.000 from
the beginning of the conditional data validation period to the completion hour of the certification
or recertification RATA.

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2.4.1 Monitor Hourly Value Data

Table 16

Precision of Reported Values for MONITOR HOURLY VALUE DATA

Parameter Codes

Number of Decimal Places*

CO2C, H2O, O2C

One

NOXC, SO2C

One

FLOW

Nearest 1,000

* All substitute data values should be rounded to the same decimal precision as quality-assured data.

MODC Code
Element Name: MODCCode
Report the appropriate method of determination code (MODC) to identify the type of monitoring
system or value used to measure and report the concentration or stack flow for the hour. Manual
entry of MODCs "16," "17," and "21" is permitted. EPA has reserved codes "01" through "55."
Codes "56" through "99" may be used by vendors and companies for other purposes but must not
be reported in a quarterly report.

Table 17

MODC Codes and Descriptions for MHV

Code Parameters

Description

01

All

Primary Monitoring System (and Primary Bypass (PB)).

02

All

Redundant Backup or Regular Non-Redundant Backup Monitoring System.

03

All

Approved Alternative Monitoring System.

04

All

Reference Method Backup System.

05

SO2C,
NOXC

Preapproved Parametric Monitoring Method Data for Controlled Units.

FLOW

Part 75 Approved Parametric Method.

06

All

Average Hour Before/Hour After.

07

All

Average Hourly Value, Initial Missing Data.
(cont.)

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Table 17

MODC Codes and Descriptions for MHV (cont.)

Code Parameters
08

Description
th

CO2C,
NOXC,
SO2C,
FLOW

90 Percentile Value in Load Range in Lookback Period.

H2O

90th or 10th Percentile Value in Load Range in Lookback Period.

O2

10th Percentile Value in Load Range in Lookback Period.

CO2C,
NOXC,
SO2C,
FLOW

95th Percentile Value in Load Range in Lookback Period (for the corresponding
load bin, if applicable).

H2O

95th or 5th Percentile Value in Load Range in Lookback Period.

O2

5th Percentile Value in Load Range in Lookback Period.

10

All

Maximum (or Minimum for O2 or H2O, if applicable) Hourly Value in Load
Range in Lookback Period.

11

NOXC,
FLOW

Average Hourly Value in Load Range in Lookback Period.

12

All

Maximum (or Minimum for O2 or H2O, if applicable) Potential Concentration
(MPC) or Flow Rate (see Section 2.1 of Appendix A to Part 75).

13

SO2C,
NOXC

Maximum Expected Concentration (MEC) (see §75.34(a)(5)).

15

SO2C,
NOXC

1.25 times the maximum hourly controlled concentration at the corresponding
load or operation bin, in the applicable lookback period (see §75.34(a)(5)).

16

SO2C

SO2 Concentration Value of 2.0 ppm during hours when very low sulfur fuels are
combusted. These hours are included in missing data lookback and are treated as
available hours for percent availability calculation.

17

CO2C,
NOXC,
O2C, SO2C

Like-Kind Replacement Analyzer.

18

NOXC,
SO2C

Maximum Potential Concentration (MPC) used to determine the hourly average
for the portion of the hour when a high range monitor was unavailable due to an
expired linearity or daily calibration error test. (See Policy Question 9.20)

19

NOXC,
SO2C

200 percent of MPC; Default High Range Value. These hours are included in
missing data lookback and are treated as available hours for percent availability
calculations.

20

CO2C,
NOXC,
O2C, SO2C,
FLOW

200 percent of the full-scale range setting (or diluent cap for O2) when there is
full-scale exceedance of high range. These hours are included in missing data
lookback and are treated as available hours for percent availability calculations.

09

(cont.)

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2.4.1 Monitor Hourly Value Data

Table 17

MODC Codes and Descriptions for MHV (cont.)

Code Parameters

Description

21

CO2C, H2O, Negative Hourly Average Concentration Replaced with Zero.
NOXC,
SO2C

22

NOXC,
SO2C

Concentration from a certified monitor at the control device inlet, when exhaust
gases are routed through an unmonitored bypass stack, or when the outlet monitor
is unavailable and proper operation of the emission controls is not verified. These
hours are included in missing data lookback and are treated as available hours for
percent availability calculations.

23

NOXC,
SO2C

MPC when flue gases are routed through an unmonitored bypass stack. These
hours are considered to be missing data hours.

24

NOXC

MEC of NOx when flue gases are routed through an unmonitored bypass stack and
the add-on NOx emission controls are confirmed to be operating properly.

53

All

Other quality-assured methodologies approved through petition. These hours are
included in the missing data lookback and are treated as available hours for
percent monitor availability calculations.

54

All

Other quality-assured methodologies approved through petition by EPA. These
hours are included in missing data lookback and are treated as unavailable hours
for percent availability calculations.

55

All

Other substitute data approved through petition by EPA. These hours are not
included in missing data lookback and are treated as unavailable hours for percent
availability calculations.

SO2 Concentration
When very low sulfur fuel is combusted, if a negative SO2 concentration is replaced (in the
Unadjusted Hourly Value field) with a value of zero ppm and the 2.0 ppm default SO2
concentration is reported in the Adjusted Hourly Value field, report MODC "16," rather than
"21" for that hour.
NOx Concentration
Note that MODCs "06" through "12," "23," "24," and "55" apply only when a separately certified
NOXC monitoring system is defined in the monitoring plan and is used to calculate NOx mass
and do not apply when only a NOx-diluent monitoring system is defined.
CO2 Concentration
MODCs "06" through "12" apply only when a CO2 monitor is used for heat input rate or CO2­
mass determinations.

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O2 Concentration
MODCs "06" through "12" apply only when a separately certified O2 monitoring system is

defined in the monitoring plan and is used exclusively for heat input rate determinations in

accordance with Equation F-17 or F-18 in Appendix F to Part 75.

Monitoring System ID
Element Name: MonitoringSystemID
For missing data substitution hours, leave this element blank. Note that hours in which the flue

gases are discharged through an unmonitored bypass stack are considered to be missing data

hours.

For quality-assured data hours, report the ID of the monitoring system from which the

concentration or stack flow was recorded, as follows:

SO2 Concentration
For quality-assured data hours, report the ID of the Monitoring System from which the
concentration value was recorded. Also, report the SO2 concentration Monitoring System ID for
the monitoring system in use at the time of any of the following occurrences: (1) when you
report the 2.0 ppm default value for an hour during which very low sulfur fuel (as defined in
§72.2) is combusted and the bias-adjusted hourly average SO2 concentration is below 2.0 ppm;
or (2) when you use a default high range value of 200 percent of the MPC in the calculation of
the hourly average SO2 concentration; or (3) when a full-scale exceedance of the high range
occurs and you use a value of 200 percent of the range in the calculation of the hourly average
SO2 concentration. In these cases, the hours are treated as quality-assured monitor operating
hours. Each of these occurrences is included in missing data lookback and is counted as an
available hour for percent monitor data availability calculations.
If a like-kind replacement non-redundant backup analyzer is used during a period of maintenance
or repair of the primary analyzer (see §75.20(d)), report the primary Monitoring System ID.
Volumetric Flow
If a full-scale exceedance occurs and you use a value of 200 percent of the range in the
calculation of the hourly average flow rate, report the Monitoring System ID of the monitoring
system which is in use at the time of the occurrence. Treat such hours as though they are qualityassured monitor operating hours; include them in missing data lookback and count them as
available hours for percent monitor data availability calculations.
NOx Concentration
If the NOx analyzer is only part of a NOx emission rate system and not part of any NOx

concentration system, leave this field blank.

Otherwise, report the System ID for the NOx concentration system.

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2.4.1 Monitor Hourly Value Data

When reporting a default high range value of 200 percent of the MPC or when reporting a value
of 200 percent of the range during a full-scale exceedance of the high range, report the System
ID of the monitoring system in use at the time of the occurrence of the full-scale exceedance.
If a like-kind replacement non-redundant backup analyzer is used during a period of maintenance
or repair of the primary analyzer (see §75.20(d)), report the primary Monitoring System ID.
CO2 Concentration
If the CO2 analyzer is only part of a NOx emission rate system, leave the System ID blank.
Otherwise, report the applicable System ID for the CO2 monitoring system defined in the

monitoring plan.

Report the Monitoring System ID of the monitoring system in use whenever a full-scale
exceedance value of 200 percent of the range is used in the calculation of the hourly average CO2
concentration. Treat such hours as though they are quality-assured monitor operating hours;
include them in missing data lookback and count them as available hours for percent monitor
data availability calculations.
If a like-kind replacement non-redundant backup analyzer is used during periods of maintenance
and repair of the primary analyzer (see §75.20(d)), report the primary Monitoring System ID.
O2 Concentration
If the O2 analyzer is only part of a NOx emission rate system (and/or an H2O system), leave the

System ID blank and use only component IDs to identify the origin of the O2 concentration

values. Otherwise, report the applicable System ID as follows:

(a) If the O2 concentration is from an O2 component of an O2 monitoring system (used to
determine hourly heat input rate), report the System ID for the O2 monitoring system.
(Note: the data will be QA'd by an O2 RATA.)
(b) If the O2 concentration is from an O2 component that is part of a CO2 monitoring system
(used for determining CO2 concentration, CO2 mass, and hourly heat input rate), report
the System ID for the CO2 monitoring system. (Note: the data will be QA'd by a CO2
RATA.)
(Note that when either the wet or the dry O2 component is part of either an O2 or CO2 monitoring
system, that component will be reported using the applicable monitoring system as described in
(a) and (b) above.)
H2O Concentration
Report the H2O System ID for every quality-assured hour.

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Component ID
Element Name: ComponentID
For each hour of quality-assured data from a CEM or stack flow system, identify the component
used during the hour. Note that hours in which the flue gases are discharged through an
unmonitored bypass stack are considered to be missing data hours.
If a like-kind replacement non-redundant backup analyzer is used during periods of maintenance
and repair of the primary analyzer (see §75.20(d)), assign and report a unique Component ID
number (beginning with the prefix "LK" as defined in the COMPONENT DATA record, e.g.,
"LK1") for the like-kind replacement analyzer. The like-kind replacement analyzer Component
ID may be manually entered. Note that the LK component must also be identified in the
monitoring plan as a monitoring component for each monitoring system that will use the data.
Volumetric Flow
If you determine hourly stack flow rate by averaging (or subtracting) the readings from two flow
components which are identified as components of the same monitoring system, leave this field
blank. If the hourly flow rate is a substitute data value, leave this field blank. This includes
hours in which the flue gases are discharged through an unmonitored bypass stack.
Percent Available
Element Name: PercentAvailable
If applicable for the parameter, report the percent monitor data availability to one decimal place
for each hour.
SO2 Concentration
For units with add-on SO2 emission controls:
(a) If you report the MPC for hours in which the flue gases are routed through an
unmonitored bypass stack, or when the outlet SO2 monitor is unavailable and proper
operation of the emission controls is not verified, do not include these hours in the
calculation of percent monitor data availability. Treat these hours as missing data hours.
(b) If you report data from a certified inlet monitor during hours in which the flue gases are
routed through an unmonitored bypass stack, or when the outlet SO2 monitor is
unavailable and proper operation of the emission controls is not verified, include these
hours in the missing data lookbacks and treat them as available hours in the PMA
calculations.
NOx Concentration
Report data in this field only if you use NOx concentration times stack flow as the primary

methodology for NOx mass calculations for all hours. Report the percent monitor data

availability for each hour.

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2.4.1 Monitor Hourly Value Data

CO2 Concentration
Report percent monitor data availability for CO2 concentration only when the CO2 value is used
for determining CO2 mass rate or heat input rate.
O2 Concentration
Report percent monitor data availability for O2 concentration only when the O2 value is used for
determining heat input rate.
Moisture (H2O)
If you use the standard moisture missing data procedures in §75.37, which are based on percent
availability, calculate and report the moisture percent data availability for each operating hour.
Moisture Basis
Element Name: MoistureBasis
If you use wet and dry O2 values to determine hourly moisture, report one of the following

uppercase codes to indicate the moisture basis of the O2 reading.

Table 18

Moisture Basis Codes and Descriptions for MHV

Code

Description

D

Dry

W

Wet

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2.4.2 DERIVED HOURLY VALUE DATA
DERIVED HOURLY VALUE DATA XML Model

Figure 10

DERIVED HOURLY VALUE DATA XML Elements

DERIVED HOURLY VALUE DATA Overview
Description of Data
Submit a DERIVED HOURLY VALUE DATA (DHV) record for each overall parameter value
determined at this monitoring location for each operating hour (or partial hour). This includes
emissions values calculated from continuous emissions monitoring (CEM) data, as well as the
overall NOx emission rate determined using Appendix E, the overall mass emission rates and
heat input rate determined using Appendix D and Appendix G, and the hourly value for each
parameter determined using the low mass emissions (LME) provisions. For hours in which the
unit or stack did not operate, do not report this record. Derived emissions values include SO2
mass or mass rate, NOx emission rate, NOx mass or mass rate, calculated H2O concentration,
calculated CO2 concentration, Heat Input or Heat Input rate, and CO2 mass or mass rate values.
Reporting stipulations for each of the derived parameters are described in more detail below.

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2.4.2 Derived Hourly Value Data

For CEM Methods
Derived Hourly Heat Input Rate (mmBtu/hr)
For each unit or stack with a stack flow monitor and diluent monitor, report the calculated heat
input rate in the AdjustedHourlyValue element of a DHV record. If you monitor heat input rate
and report this record at a common stack, also apportion the heat input rate measured at the
common stack to the individual units (i.e., report additional DHV records for heat input rate
under the associated Unit IDs). If you monitor heat input rate and report this record at multiple
stacks, also report the heat input rate for the unit in an additional DHV record.
Derived SO2 Hourly Mass Emission Rate (lb/hr)
For each unit or stack with an SO2 CEMS (or using the F23 methodology per §75.11(e)(1)),

report the calculated SO2 mass emission rate in the AdjustedHourlyValue element of a DHV

record.

If you monitor SO2 mass emission rate and report this record at a common stack, do not
apportion the SO2 mass emission rate measured at the common stack to the individual units (i.e.,
do not report any additional DHV records under the associated Unit IDs).
If, for a particular unit, you monitor SO2 mass emission rate at multiple stacks (or ducts), do not
report the combined SO2 mass emission rate for the unit (i.e., do not report any unit-level DHV
records).
Derived NOx Hourly Emission Rate (lb/mmBtu)
For each unit or stack with a NOx emission rate CEMS, report the calculated NOx emission rate
in the UnadjustedHourlyValue element and the bias-adjusted emission rate in the
AdjustedHourlyValue element of a DHV record. If you monitor NOx emission rate and report
this record at a common stack, do not apportion the NOx emission rate measured at the common
stack to the individual units (i.e., do not report any additional DHV records under the associated
Unit IDs).
If, for a particular unit, you monitor NOx emission rate at multiple stacks (or ducts), calculate the
heat-input weighted hourly emission rate for the unit, but do not report those hourly unit level
values (i.e., do not report any unit-level DHV records for NOx emission rate). Rather, only use
them to calculate the quarterly and cumulative NOx emission rates for the unit. Report these
quarterly and cumulative values in the unit-level SUMMARY VALUE DATA record.
For a combined-cycle turbine that uses a multiple-stack configuration, report separate stack-level
DHV records for each hour in which there is both main stack and bypass stack operating time.
Then, calculate a time-weighted unit-level NOx emission rate for each hour, as described in the
SUMMARY VALUE DATA record instructions. Store, but do not report, these time-weighted,
hourly unit-level emission rates. Rather, only use them to calculate the quarterly and cumulative
unit-level NOx emission rates.

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For Derived NOx Mass Emission Rate (lb/hr)
For each unit, stack, or pipe at which NOx mass emissions are measured or estimated, submit a

DHV record, for every hour in the reporting period that the unit or stack operates.

If you monitor NOx mass emissions and report this record at a common stack, do not apportion
the NOx mass emissions measured at the common stack to the individual units (i.e., do not report
any additional DHV records under the associated Unit IDs).
If, for a particular unit, NOx mass emissions is monitored at multiple stacks (or ducts), do not

report the combined hourly NOx mass emissions for the unit (i.e., do not report any unit-level

DHV records for NOx mass rate).

Derived CO2 Mass Emission Rate (tons/hr)
For any operating hour (or partial hour) for each unit, stack, or pipe at which CO2 emissions are
monitored using CEMS, including the use of O2 CEMS, report CO2 mass emission rate in a DHV
record.
If you monitor CO2 mass emission rate and report this record at a common stack, do not
apportion the CO2 mass emission rate measured at the common stack to the individual units (i.e.,
do not report any additional DHV records under the associated unit IDs).
If, for a particular unit, CO2 mass emission rate is monitored at multiple stacks (or ducts), do not
report the combined CO2 mass emission rate for the unit (i.e., do not report any unit-level DHV
records).
Derived CO2 Concentration
For any operating hour (or partial hour) for each unit or stack at which CO2 concentration is

determined by calculating it from O2 readings, report the derived CO2 concentration value for

each operating hour or partial operating hour in this record. Note that measured CO2

concentration from a CO2 system utilizing a CO2 monitor should be recorded in the MONITOR

HOURLY VALUE DATA (MHV) record.

Derived H2O (Moisture) Value
For any operating hour (or partial hour) for each unit or stack at which moisture is determined by
calculating it from wet and dry O2 readings, report the derived moisture value for each operating
hour or partial operating hour in this record.
● Note that measured H2O values from a moisture sensor or a temperature sensor and look­
up table, if reporting for saturated gas streams, should be reported in the MHV record.
If you use a fuel-specific default moisture value, as allowed under §75.11 or §75.12 (for coal and
wood-burning units and natural gas-fired boilers) and you have just one default value defined in
your monitoring plan, do not report a MHV record or a DHV record on an hourly basis.

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2.4.2 Derived Hourly Value Data

However, if you have more than one active fuel-specific default moisture value defined in your

monitoring plan, report the fuel-specific or pro-rated moisture value used in your emissions

calculations in an H2O DERIVED HOURLY VALUE DATA record with a Method of Determination

Code (MODC) of "40" on an hourly basis.

Derived SO2 Hourly Emission Rate (lb/mmBtu)
If you are using the F23 methodology to calculate the SO2 mass rate per §75.11(e)(1) and you
have defined more than one fuel-specific SO2 emission rate default value in your monitoring
plan, report the fuel-specific or pro-rated default value used in your emissions calculations in an
SO2R DERIVED HOURLY VALUE DATA record with an MODC of "40" on an hourly basis.
Appendix D Methods
Heat Input
If you use Appendix D fuel flowmetering to determine heat input, report the heat input rate
calculated for each fuel in the appropriate HOURLY PARAMETER FUEL FLOW DATA records. In
addition, report the total heat input rate for the hour in a DHV record for the location. (You must
report this record even if only one fuel was combusted during the hour.) If the fuel flowmetering
is at a common pipe, also report the apportioned hourly heat input rate in a DHV record for each
unit that is part of the common pipe.
SO2
If you use Appendix D fuel flowmetering to determine SO2, report the SO2 mass emission rate

calculated for each fuel in the appropriate HOURLY PARAMETER FUEL FLOW DATA record. In

addition, report the total SO2 mass emission rate for the hour in a DHV record for the location.

(You must report this record even if only one fuel was combusted during the hour.) If the fuel

flowmetering is at a common pipe, do not report hourly apportioned SO2 for the units.

Appendix G Method for Hourly CO2
If you use Equation G-4 to determine hourly CO2, report the CO2 mass emission rate calculated

for each fuel in the appropriate HOURLY PARAMETER FUEL FLOW DATA record. In addition,

report the total CO2 mass emission rate for the hour in a DHV record. (You must report this

record even if only one fuel was combusted during the hour.)

Appendix E Method for Hourly NOx Emission Rate
If you use Appendix E to determine NOx emission rate, report the overall NOx emission rate for
the hour in a DHV record. If you burn a single, consistent blend of fuels and established a single
Appendix E curve for that fuel blend, report all the Appendix E related information in this DHV
record. If you established a separate Appendix E curve for each fuel, report the fuel-specific
NOx emission rate data in the appropriate HOURLY PARAMETER FUEL FLOW DATA record and in
addition, report the overall NOx emission rate for the hour in a DHV record. (You must report
this record even if only one fuel was combusted during the hour.)

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Hourly NOx Mass Rate Based on Appendix D Heat Input Rate
If you are required to report NOx mass rate, calculate this value from the heat input rate and NOx
emission rate reported in the DHV record and report it in a DHV record.
LME Methods
For each parameter reported using the LME method, report a DHV record for each operating

hour.

DERIVED HOURLY VALUE DATA XML Elements

Parameter Code

Element Name: ParameterCode
Report the appropriate Parameter Code as shown in Table 19.

Table 19

Parameter Codes and Descriptions for the DHV DATA Record

Code

Description

CO2

CO2 Hourly Mass Emission Rate (tons/hr)

CO2C

CO2 Concentration (derived from O2 measurements) (%CO2)

CO2M

CO2 Hourly Mass (tons) (LME)

H2O

Moisture (from wet/dry O2 measurements) (%H2O)

HI

Heat Input Rate (mmBtu/hr)

HIT

Heat Input Total (mmBtu) (LME)

NOX

NOx Hourly Mass Emission Rate (lb/hr)

NOXM

NOx Hourly Mass (lb) (LME)

NOXR

NOx Emissions Rate (lb/mmBtu)

SO2

SO2 Hourly Mass Rate (lb/hr)

SO2M

SO2 Hourly Mass (lb) (LME)

SO2R

SO2 Hourly Emission Rate (lb/mmBtu)

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Unadjusted Hourly Value
Element Name: UnadjustedHourlyValue
Report the unadjusted derived hourly value for the parameter specified, as follows:
NOx Emission Rate from CEM
Calculate and report the NOx emission rate (lb/mmBtu) based on the unadjusted NOx
concentration and unadjusted diluent (CO2 or O2) concentration recorded in the MHV record.
Report the resulting value to the appropriate number of decimal places in Table 20. For hours in
which you use missing data procedures leave this field blank, including hours in which the flue
gases are discharged through an unmonitored bypass stack.
If you use Equation 19-3 or 19-5 to determine NOx emission rate, you must use modified

Equation 19-3D or 19-5D (as applicable) instead of Equation 19-3 or 19-5, for hours in which

you use the diluent cap (see Table 29 in the MONITORING FORMULA DATA record in the

Monitoring Plan Reporting Instructions).

For all other parameters, leave this field blank.
Adjusted Hourly Value
Element Name: AdjustedHourlyValue
Report the adjusted or "final" derived hourly value for the parameter specified.
SO2 Mass Emission Rate (lb/hr)
For CEM methods, this value is normally derived using the bias-adjusted stack flow and the biasadjusted SO2 concentration (each reported in the MHV record), in conjunction with the
appropriate equation in Appendix F to Part 75. However, for an hour in which a very low sulfur
fuel (see §72.2) is combusted, the value may be calculated from a CEMS-derived heat input rate
(i.e., from monitored stack flow rate, and diluent (CO2 or O2) concentration) and a default SO2
emission rate using Equation F-23 (see §75.11(e)(1)).
For Appendix D units and pipes, report the total SO2 mass emission rate for the location in this
field. Use formula D-12 to combine SO2 mass emission rates from multiple fuels (as reported in
HOURLY PARAMETER FUEL FLOW).
Report all data for this element in lb/hr and to the appropriate number of decimal places per

Table 20.

NOx Mass Emission Rate (lb/hr)
If you use NOx concentration times stack flow rate to determine NOx mass emissions, use the
bias-adjusted stack flow and the bias-adjusted NOx concentration, (each reported in the MHV
record), in conjunction with the appropriate equation in Appendix F to Part 75. If instead, NOx
mass emissions are calculated from the NOx emission rate times heat input rate, use the adjusted
NOx emission rate and adjusted heat input values as reported in the DHV record for each
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parameter. Report data for this element in lb/hr and to the appropriate number of decimal places
per Table 20.
NOx Emission Rate (lb/mmBtu)
CEM Systems. For each hour in which you report NOx emission rate in the Unadjusted Hourly
Value element, apply the appropriate adjustment factor (1.000 or bias adjustment factor (BAF))
to the rounded average NOx emission rate and report the adjusted NOx emission rate for the hour.
Report the resulting value to the appropriate number of decimal places per Table 20. Report the
appropriate substitute data value for NOx emission rate for each hour that a quality-assured
emission rate is not obtained, including hours in which the flue gases are discharged through an
unmonitored bypass stack. Do not leave this field blank.
Note that for an initial certification, analyzer replacement, or complete monitoring system
replacement (as indicated by reporting a QA CERTIFICATION EVENT record with an Event Code
of 100, 101, 120, 125, 151, 250, 255, 300 or 305), if you are using conditional data validation,
the BAF is uncertain during the conditional data period. Therefore, apply a BAF of 1.000 from
the beginning of the conditional data validation period to the completion hour of the certification
or recertification RATA. For any other events that require a RATA, apply the BAF from their
previous RATA during the conditional data period, unless that RATA failed or was aborted, in
which case use 1.000.
For a combined-cycle combustion turbine (CT) using a multiple-stack configuration to report

NOx emission rate, use missing data substitution for any transition hour (i.e., an hour during

which gases flow through both stacks), if either the main stack or bypass monitoring system is

out of service, and draw the appropriate substitute data value from the bypass stack data pool.

If a full-scale exceedance of the low NOx range occurs and you use a default high range value of
200 percent of the MPC in the calculation of the hourly average NOx concentration reported in
the MHV record, or if a full-scale exceedance of the high NOx range occurs and you use a value
of 200 percent of the range in the calculation of the hourly average NOx concentration reported
in the MHV record, use the reported NOx concentration in conjunction with the quality-assured
diluent concentration for the hour to calculate and report the NOx emission rate. These hours are
treated as quality-assured monitor operating hours; they are included in missing data lookback
and are treated as available hours for percent monitor data availability calculations.
If a diluent concentration is unavailable during an hour in which a full scale exceedance of the
NOx analyzer occurs or an hour in which the default high range value is used, the NOx emission
rate for the hour is considered to be missing. In that case, do not report Monitor Hourly Value
for NOx concentration for this hour since the NOx emission rate cannot be calculated; instead,
report the maximum potential NOx emission rate (MER) in this field, and use an MODC of "25."
Appendix E Systems. Report the overall NOx emission rate for the unit to the appropriate
number of decimal places per Table 20. If this value was determined from a consistent fuel mix
curve, also report the appropriate System ID for the Appendix E NOx system. If a single fuel
curve or curves were defined, report the fuel-specific NOx emission rate in the appropriate
PARAMETER FUEL FLOW DATA record(s), and report the combined NOx emission rate for the unit
in this record.
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CO2 Concentration (Derived from O2 Concentration) (pct)
Report the CO2 Concentration for the hour to the appropriate number of decimal places per Table
20. This is either the value calculated from a quality-assured O2 concentration value (as reported
in the MHV record), or the appropriate substitute data value, as specified in §75.35.
CO2 Mass Emission Rate (tons/hr)
If you are using CEMS, this value is derived using the bias-adjusted stack flow and either the

unadjusted CO2 concentration reported in the MHV record (if you are using a CO2 analyzer), or

the CO2 Concentration reported in the DHV record (if you are using an O2 analyzer), in

conjunction with the appropriate equation in Appendix F to Part 75.

For units using Appendix G, calculate and report, in PARAMETER FUEL FLOW DATA record(s), the
CO2 mass emissions (tons/hr) for each fuel separately using Equation G-4. Then use Equation
G-4A (see Table 32, MONITORING FORMULA DATA record in the Monitoring Plan Reporting
Instructions) to determine the combined CO2 mass emission rate for the hour. Report the
combined hourly CO2 mass emission rate (tons/hr) in this field in the DHV record.
Report this element in tons per hour and to the appropriate number of decimal places per Table
20.
H2O (Moisture) (pct)
Report moisture for the hour, expressed in %H2O, rounded to one decimal place. Report the

appropriate substitute data value for hours in which a quality-assured moisture percentage is

unavailable or for hours in which the flue gases are discharged through an unmonitored bypass

stack.

Heat Input (HI) Rate (mmBtu/hr)
Report this value in mmBtu per hour (mmBtu/hr) and to the appropriate number of decimal
places per Table 20. If you use CEMS to determine hourly heat input rate, calculate the hourly
rate using the diluent gas concentration, bias-adjusted hourly stack flow rate, percent moisture (if
appropriate), and F-factor.
If you measure and report heat input rate at a common stack or pipe, also apportion and report

heat input rate at the unit level. This apportionment should be based on megawatts, steam load,

or fuel flow rate, using Equation F-21A, F-21B, or F-21D in Appendix F to Part 75, as

applicable. These formulas use time-weighted hourly load to apportion the heat input rate

measured at a common stack to the individual units.

For each hour, the sum of the individual heat inputs in mmBtu (i.e., the sum of the individual
unit heat input rates, each multiplied by the corresponding unit operating time) must equal the
total common stack heat input in mmBtu (i.e., the common stack heat input rate multiplied by the
common stack operating time).

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For a unit with a multiple stack configuration, with flow rate and diluent monitors on each stack,
calculate the hourly heat input rate for the unit using Equation F-21C in Appendix F to Part 75.
Also use Equation F-21C for multiple pipe configurations.
For each hour, the total unit heat input in mmBtu (i.e., the unit heat input rate multiplied by the

unit operating time) must equal the sum of the individual stack (or pipe) heat inputs in mmBtu

(i.e., the sum of the individual stack (or pipe) heat input rates, each multiplied by the

corresponding stack (or pipe) operating time).

For Appendix D units combusting multiple fuels, report the hourly heat input rate calculated
from all fuels in the DHV record. Report this record even if only one fuel was combusted during
the hour.
For non-Acid Rain NOx Budget Program units that use NOx concentration times stack flow as

the primary methodology to calculate NOx mass emissions, report the hourly heat input rate

unless you are specifically exempted (e.g., by a State SIP) from reporting it for allocation

purposes. However, you must report unit operating time and load (except for non load-based

units) for each hour in the HOURLY OPERATING DATA record, even if you are not required to

report hourly heat input.

If, for any operating hour, the heat input rate is calculated to be less than one mmBtu/hr,

substitute for that hour a value of one mmBtu/hr. Use an MODC of "26" for any such hours.

This applies only to monitoring locations where CEMS are installed (i.e., where HI Rate is

calculated using equation F-15, F-16, F-17, or F-18.) This does not apply to HI Rate calculated

through Appendix D or apportionment.

In the rare event no units attached to the common stack generated load (Load = 0) during the

hour, heat input should be apportioned by operating time.

Total Heat Input (HIT) (mmBtu)
Report this value in mmBtu for LME units and to the appropriate number of decimal places per

Table 20.

SO2 Emission Rate (lb/mmBtu)
If you are using the F23 methodology to calculate the SO2 mass rate per §75.11(e)(1) and you

have defined more than one fuel-specific SO2 emission rate default value in your monitoring

plan, report the fuel-specific or pro-rated default value in lb/mmBtu. Report the value to the

appropriate number of decimal places per Table 20.

LME Units
Report the value for each required parameter as total mass (or heat input) for the hour. Report

each value to the appropriate number of decimal places per Table 20.

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2.4.2 Derived Hourly Value Data

Table 20

Precision of Reported Values for DERIVED HOURLY VALUE DATA

Parameter Codes

Number of Decimal Places

CO2, CO2C, CO2M, H2O, HI, HIT, NOX,
NOXM, SO2M

One

SO2

For CEM and Appendix D
burning only oil during hour

One

SO2

Appendix D burning any gas
during hour

Four

NOXR

Three

SO2R

Four

MODC Code
Element Name: MODCCode
For CEM methods for parameters CO2C, NOXR or H2O, report one of the following MODCs as
shown in Table 21 to identify the monitoring system or missing data procedure used to report the
derived value or when you were directed to report it for an approved alternative monitoring
system. For parameter HI, use an MODC of "26" when the calculated Heat Input Rate is zero or
negative and was therefore replaced with a value of 1.0. Report an MODC of "40" for
parameters SO2R and H2O when a fuel-specific or pro-rated default value is used in determining
the derived value.
For all other parameters, leave this field blank.
NOx Hourly Emission Rate
Report an MODC of "14" when the diluent cap value for CO2 or O2 is used in place of the
measured value reported in the MHV records. Also, be sure that you register the appropriate
diluent cap value for the unit in the MONITORING DEFAULT DATA record in the monitoring plan.
A diluent cap value can only be used for calculating NOx emission rate during operating hours
for which a quality-assured measured diluent (CO2 or O2) value is obtained.
For full-scale exceedances of a NOx analyzer, EPA requires reporting of an MODC reflecting the
monitoring system in use during the exceedance, or reporting an MODC of "25" if the diluent
concentration normally reported in the MHV records is not quality-assured. Therefore, during
full-scale exceedances, when 200 percent of MPC or 200 percent of range is reported for NOx
concentration in the MHV record and is used in conjunction with a quality-assured diluent gas
concentration to calculate the NOx emission rate, report the MODC code associated with the
monitoring system that is in use at the time of the full-scale exceedance (for example, report "01"
if the primary NOx-diluent monitoring system is in use). If a full-scale exceedance of the NOx
analyzer occurs and no quality-assured diluent gas concentration for the hour is available, report
an MODC of "25" for that hour. Manual entry of an MODC of "21" is permitted.

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Table 21

MODC Codes and Descriptions for DHV

Code

Parameter(s)

Description

01

CO2C, NOXR,
H2O

Primary Monitoring System (and Primary Bypass (PB) for NOXR).

02

CO2C, NOXR,
H2O

Redundant Backup or Regular Non-Redundant Backup Monitoring
System.

03

All

Approved Part 75 Alternative Monitoring System.

04

CO2C, NOXR,
H2O

Reference Method Backup System.

05

NOXR

Part 75 Approved Parametric Method for Controlled Units.

06

CO2C, NOXR,
H2O

Average Hour Before/Hour After.

07

CO2C, NOXR,
H2O

Average Hourly Value, Initial Missing Data.

08

CO2C, NOXR

90th Percentile Value in Load Range in Lookback Period.

H2O

90th or 10th Percentile Value in Load Range in Lookback Period.

CO2C, NOXR

95th Percentile Value in Load Range in Lookback Period.

H2O

95th or 5th Percentile Value in Load Range in Lookback Period.

CO2C, NOXR

Maximum Hourly Value in Load Range in Lookback Period.

H2O

Maximum or Minimum Hourly Moisture Percentage in Lookback Period.

11

NOXR

Average Hourly Rate in Load Range in Lookback Period.

12

CO2C, NOXR

Maximum Concentration or Emission Rate.

H2O

Maximum or Minimum Potential moisture percentage.

13

NOXR

Maximum Controlled NOx Emission Rate (MCR).

14

NOXR

Diluent Cap (if the cap is replacing a CO2 measurement, it should be 5.0
percent for boilers and 1.0 percent for turbines; if it is replacing an O2
measurement, it should be 14.0 percent for boilers and 19.0 percent for
turbines.)

15

NOXR

1.25 times the NOx Emission Rate at the corresponding load or operational
bin, in the applicable lookback.

21

CO2C, H2O
NOXR

A negative hourly value replaced with a zero.

22

NOXR

NOx Emission Rate calculated from a certified NOx monitor at the control
device inlet, when the outlet NOx monitor is unavailable and proper
operation of the emission controls is not verified. These hours are included
in missing data lookback and are treated as available hours for percent
availability calculations.

09

10

(cont.)

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2.4.2 Derived Hourly Value Data

Table 21

MODC Codes and Descriptions for DHV (cont.)

Code

Parameter(s)

Description

23

NOXR

Maximum Potential NOx Emission Rate (MER) for an hour in which flue
gases are discharged through an unmonitored bypass stack.

24

NOXR

MCR for an hour in which flue gases are discharged downstream of the
NOx emission controls through an unmonitored bypass stack, and the addon NOx emission controls are confirmed to be operating properly.

25

NOXR

MER. Use only when a NOx concentration full-scale exceedance occurs
and the diluent monitor is unavailable.

26

HI

One mmBtu/hr substituted for Heat Input Rate for an operating hour in
which the calculated Heat Input Rate is zero or negative.

40

SO2R

Fuel-Specific or Pro-Rated SO2 Emission Rate default value for use with
Formula F-23.

H2O

Fuel-Specific or Pro-Rated moisture default value.

45

HIT

Maximum Rated Hourly Heat Input Rate (used to determine heat input for
LME units generally using long-term fuel flow method).

53

All

Other quality-assured methodologies approved through petition. These
hours are included in the missing data lookback and are treated as available
hours for percent monitor availability calculations.

54

All

Other quality-assured methodologies approved through petition by EPA.
These hours are included in missing data lookback and are treated as
unavailable hours for percent availability calculations.

55

All

Other substitute data approved through petition by EPA. These hours are
not included in missing data lookback and are treated as unavailable hours
for percent availability calculations.

* EPA has reserved MODCs "01" through "55." MODCs "56" through "99" may be used by vendors and

companies for other purposes; do not report these codes in a quarterly report. MODCs "30" and "31"

were defined in EDR v2.0 for Ozone Trading Commission (OTC) NBP units only and are no longer

allowed.

Monitoring System ID
Element Name: MonitoringSystemID
Report the Monitoring System ID for the appropriate monitoring system that is providing
quality-assured data for the hour. For missing data hours and hours in which the flue gases are
discharged through an unmonitored bypass stack, leave this field blank. Also, leave this field
blank for the calculated SO2, NOx, and CO2 hourly mass emission rates. If either: (1) a default
high range NOx concentration value of 200 percent of the MPC is reported due to a full-scale
exceedance of the low range; or (2) a value of 200 percent of the range is reported during a fullscale exceedance of the high range, report the ID number of the NOx-diluent monitoring system
which is in use at the time of the full-scale exceedance.

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For heat input records, report the Monitoring System ID for the O2 or CO2 system that provided
the value used in the calculation. However, if missing data substitution was used in the MHV
record, leave the System ID blank in this DHV record also. Table 22 below summarizes these
requirements.

Table 22

System ID Reporting for Derived Hourly Values

Parameter Code

Description

System ID to Report

CO2

CO2 Hourly Mass Rate

Leave blank.

CO2C

CO2 Concentration (from an O2
monitor)

CO2 System ID.

H2O

Moisture (from wet/dry H2O
system)

H2O System ID.

HI

Heat Input

CO2 or O2 System ID if CEM. Otherwise, leave
blank.

NOX

NOx Hourly Mass Rate from
NOx Concentration and Stack
Flow

Leave blank.

NOx Hourly Mass Rate from
NOx Emissions Rate and Heat
Input

Leave blank.

NOXR

NOx Emissions Rate

NOx System ID for CEM system or NOXE
System ID for Appendix E mixed-fuel curve.
Otherwise, leave blank.

SO2

SO2 Hourly Mass Rate

Leave blank.

Formula Identifier
Element Name: FormulaIdentifier
Report the Formula ID from the MONITOR FORMULA DATA record that is used for the calculation
of the parameter. Leave this field blank for missing data hours and LME records. If using the
Appendix D methodology to determine SO2, CO2, or Heat Input and burning multiple fuels for
the hour, report the Formula ID from the MONITOR FORMULA DATA record with Formula
Code D-12, G-4A, or D-15A respectively. If burning a single fuel for the hour, leave this field
blank. If using multiple Appendix E curves to determine the NOx emission rate for the hour,
report the Formula ID from the MONITOR FORMULA DATA record with Formula Code E-2.
If using a single curve for the hour, leave this field blank.

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2.4.2 Derived Hourly Value Data

Percent Available
Element Name: PercentAvailable
For NOXR from a CEM system, H2O, or CO2C, report the percent monitor data availability
(PMA) to one decimal place for all hours. Do not report PMA for Heat Input Rate or SO2, NOx,
or CO2 hourly mass emission rates.
Operating Condition Code
Element Name: OperatingConditionCode
This field applies only to Appendix E NOXR data and LME NOXM data.

For an Appendix E NOx emission rate record (for a unit using one correlation curve for a

consistent fuel mixture), report the appropriate code from Table 23 below to indicate the

condition that was used to determine the NOx emission rate for the hour.

See the instructions for this field in the HOURLY PARAMETER FUEL FLOW DATA record for details
about when to report each operating condition code.

Table 23

Operating Condition Codes and Descriptions for DHV

Code

Description

B

Unit operated at base load or set point temperature (LME)

C

Controls Operating Properly (LME)

E

Emergency Fuel (Appendix E)

M

Correlation Curve for the Fuel Mixture has Expired
(Appendix E)

N

Operating Parameter is Outside of Normal Limits (Appendix
E)

P

Unit operated at peak load or higher internal operating
temperature (LME)

U

Uncontrolled Hour (Appendix E or LME)

W

Operation Above Highest Tested Heat Input Rate Point on
the Curve (Appendix E)

X

Operating Parameter Data Missing or Invalid (Appendix E)

Y

Designated Operational and Control Equipment Parameters
within Normal Limits (Appendix E)

Z

Operation Below Lowest Tested Heat Input Rate Point on
the Curve (Appendix E)

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In the NOXM record for an LME unit that uses a fuel- and unit-specific default NOx emission

rate and has NOx controls, indicate the status of the NOx controls for the hour by reporting:

C = Controls Operating Properly
U = Unit Controls Not Operating or Not Operating Properly
In the NOXM record for an LME combustion turbine that operates principally at base load (or at
a set point temperature) but is capable of operating at a higher peak load (or higher internal
operating temperature), indicate for each operating hour whether operation was a base load (B)
or peak load (P).
B = Unit operated at base load or set point temperature
P = Unit operated at peak load or higher internal operating temperature
For all other records, leave this field blank.
Segment Number
Element Name: SegmentNumber
For an Appendix E NOx Emission Rate record (for a unit using one correlation curve for a
consistent fuel mixture), report the Segment Number (1 – 4) indicating which portion of the
correlation curve was used to determine the value for the hour. For operating condition codes N
or X, report the segment number that contains the highest NOx emission rate on the curve for the
fuel. Leave this field blank if the correlation curve was not used for the hour (i.e., the Operating
Condition Code is E, M, U, or W).
Fuel Code
Element Name: FuelCode
For LME units, report the type of fuel combusted in the hour. If multiple fuels are burned, report
the fuel type used to determine the mass emissions for the parameter in this record (i.e., the fuel
with the highest emission factor for the parameter). If records are missing as to which fuel was
burned in the hour, report the fuel with the highest emission factor for this parameter of all of the
fuels capable of being burned in the unit.
Table 24

Fuel Codes and Descriptions

Code

Description

BFG

Blast Furnace Gas

BUT

Butane (if measured as a gas)

CDG

Coal-Derived Gas

COG

Coke Oven Gas

DGG

Digester Gas
(cont.)

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2.4.2 Derived Hourly Value Data

Table 24

Fuel Codes and Descriptions (cont.)

Code

Description

DSL

Diesel Oil

LFG

Landfill Gas

LPG

Liquefied Petroleum Gas

NNG

Natural Gas (as defined in §72.2)

OGS

Other Gas

OIL

Residual Oil

OOL

Other Oil

PDG

Producer Gas

PNG

Pipeline Natural Gas (as defined in §72.2)

PRG

Process Gas

PRP

Propane (if measured as a gas)

RFG

Refinery Gas

SRG

Unrefined Sour Gas

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2.4.3 HOURLY FUEL FLOW DATA
HOURLY FUEL FLOW DATA XML Model

Figure 11

HOURLY FUEL FLOW DATA XML Elements

HOURLY FUEL FLOW DATA Overview
Description of Data
Whenever a flowmeter is used to determine heat input rate or SO2 or CO2 emissions in accordance
with Appendix D, report an HOURLY FUEL FLOW DATA (HFF) record for each type of oil and/or
gaseous fuel combusted during each operating hour using the Monitoring System ID associated
with the appropriate flowmeter monitoring system. Do not report an HFF record for low mass
emissions units (LME) that use a certified Appendix D fuel flowmeter for long term fuel flow
purposes; use the LONG TERM FUEL FLOW (LTFF) record.
To report hourly SO2 mass emission rate, CO2 mass emission rate and/or Heat Input, you must also
submit the appropriate HOURLY PARAMETER FUEL FLOW DATA records associated with each HFF
record.
If you measure fuel flow at a common pipe location, report a HFF record using the Stack Pipe ID
for each hour in which fuel is combusted by a unit served by the common pipe. Do not report HFF
records for the individual units on an hourly basis. Apportion the heat input rate calculated at the
common pipe location to each unit, using appropriate time-weighted apportionment formulas
based on load (see Appendix F and the MONITOR FORMULA DATA instructions). Report the
apportioned hourly heat input rate values in separate DERIVED HOURLY VALUE DATA (DHV)
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2.4.3 Hourly Fuel Flow Data

records for the individual units. Use the hourly heat input rates and operating times from the DHV
records to calculate the cumulative heat input values for each unit and report these values in unitlevel SUMMARY VALUE DATA records. If you use uncertified fuel flowmeters at the unit and
Equation F-21D to apportion the common pipe heat input to the individual units, report HFF only
for the common pipe -- do not report any HFF records showing the fuel flow to the individual
units.
For Oil Fuel Flow Records
Report an HFF for any hour in which oil is combusted as a startup fuel and fuel flow is estimated

through tank measurements.

The oil flow rate is the net fuel flow rate to the unit(s). For example, it may represent the

difference between the values measured for the main supply and re-circulating oil lines or it may

represent the sum of oil flow for two fuel flowmeters measuring the same type of oil to the unit.

For oil fuel flow systems, if the fuel flow system measures mass flow rate of oil directly, leave

blank the following data elements:

● Volumetric Flow Rate
● Volumetric Units of Measure Code
● Source of Data Volumetric Code
HOURLY FUEL FLOW DATA XML Elements
Fuel Code
Element Name: FuelCode
Report the type of oil or gaseous fuel combusted during the hour for the system. For oil fuels use
the general fuel type codes provided in Table 25 below. For gaseous fuels, you may either report
the type of fuel using the General Fuel Type codes (which are consistent with the codes used in the
UNIT FUEL DATA record in the monitoring plan) or report more specific fuel codes for the type of
gas combusted using one of the Specific Fuel Type codes. Both sets of fuel type codes are listed in
Table 26 below. The Fuel Code should match the Fuel Code in the Monitor System record
associated with the Monitoring System ID.
For Oil Fuel Flow Records

Table 25

Oil Fuel Flow Fuel Codes and Descriptions

Code

Description

DSL

Diesel Oil

OIL

Residual Oil

OOL

Other Oil

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For Gas Fuel Flow Records

Table 26

Gas Fuel Flow Fuel Codes and Descriptions

Code

Description
General Fuel Type Codes

LPG

Liquefied Petroleum Gas (if measured as a gas)

NNG

Natural Gas

OGS

Other Gas

PNG

Pipeline Natural Gas (as defined in §72.2)

PRG

Process Gas

Specific Fuel Type Codes
BFG

Blast Furnace Gas

BUT

Butane (if measured as a gas)

CDG

Coal-Derived Gas

COG

Coke Oven Gas

DGG

Digester Gas

LFG

Landfill Gas

PDG

Producer Gas

PRP

Propane (if measured as a gas)

RFG

Refinery Gas

SRG

Unrefined Sour Gas

Fuel Usage Time
Element Name: FuelUsageTime
Report the fraction of the clock hour during which the unit combusted the specified fuel. You may
use any equal increments from hundredths (0.01 hr) to quarters (0.25 hr) of an hour. Do not leave
this field blank.
For common pipes, report the cumulative portion of the hour during which the specified fuel was
combusted in any of the units served by the common pipe, not to exceed a fuel usage time of 1.00.
For example, if a common pipe serves Units 1 and 2 and both units operate for the first 24 minutes
(0.40 hr) of the hour and then are both shut down, the fuel usage time is 0.40. If Unit 1 operates
only for the first 24 minutes of the hour and Unit 2 operates only for the last 24 minutes of the
hour, the fuel usage time is 0.40 hr plus 0.40 hr, or 0.80. If Unit 1 operates for the first 40 minutes
of the hour and Unit 2 operates for the last 40 minutes of the hour, report a fuel usage time of 1.00,
since for all minutes in the hour, at least one of the units operated.
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2.4.3 Hourly Fuel Flow Data

Volumetric Flow Rate
Element Name: VolumetricFlowRate
For Oil Fuel Flow Records
If the fuel flow system measures the volumetric flow rate of oil, report the net volumetric flow
rate, as measured, rounded to one decimal place. This value represents an hourly rate for periods
in which the fuel is combusted, not a total flow for the hour. If the hourly oil flow rate is so small
that it results in a heat input rate of 0.0 mmBtu/hr (rounded to the nearest tenth) when Equation
D-8 is used, you may report, as a default value, the minimum oil flow rate that will give a heat
input rate greater than zero. This minimum oil flow rate must be defined in the MONITOR
DEFAULT DATA record in the monitoring plan.
For units using Appendix D to account for SO2 mass emissions you must report mass flow rate. If
you use a volumetric flowmeter, report the volumetric flow rate in this field, the mass oil flow rate
in the Mass Flow Rate field, and the density value used for the conversion in an HOURLY
PARAMETER FUEL FLOW record. If the fuel flow system measures mass flow rate of oil directly,
leave this field blank.
For Gas Fuel Flow Records
For Appendix D gas systems, the flow rate of gas is measured hourly by the fuel flowmeter

system. The flow rate is the net fuel flow rate to the unit(s). For example, it may represent the

sum of the gas flow rates for two fuel flowmeters measuring gas to the unit. All values must be

reported in 100 standard cubic feet per hour (100 scfh) rounded to one decimal place. This value

represents an hourly rate for periods in which the fuel is combusted, not a total flow for the hour.

If the hourly gas flow rate is so small that it results in a heat input rate of 0.0 mmBtu/hr (rounded

to the nearest tenth) when Equation D-6 is used, you may report, as a default value, the minimum

gas flow rate that will give a heat input rate greater than zero. This minimum gas flow rate must

be defined in the MONITOR DEFAULT DATA record in the monitoring plan.

Volumetric Units of Measure Code
Element Name: VolumetricUnitsOfMeasureCode
Report the units of measure used to report volumetric flow rate using the appropriate code from

Table 27.

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Table 27

Volumetric Units of Measure Codes and Descriptions

Fuel Type Units of Measure Code
Oil

Gas

Description

BBLHR

Barrels/Hour

GALHR

Gallons/Hour

M3HR

Cubic Meters/Hour

SCFH

Standard Cubic Feet/Hour

HSCF

100 Standard Cubic Feet/Hour

Leave this field blank only for Oil HFF records, where the fuel flow system measures mass flow
rate of oil directly.
Source of Data Volumetric Code
Element Name: SourceOfDataVolumetricCode
Report the Source of Data Volumetric Code that indicates the type of value reported for gas flow
or volumetric oil flow rate, as shown in Table 28.

Table 28

Source of Data Volumetric Codes and Descriptions

Code

Fuel Type

Description

0

Oil or Gas

Measured Data

1

Oil or Gas

Substitute Data Using Lookback Procedures

3

Oil or Gas

Maximum Potential Fuel Flow Rate (simplified missing data procedure for
peaking units, only)

4

Oil or Gas

Emergency Fuel (maximum unit fuel flow rate)

5

Oil

Igniter Oil from Tank Measurements

6

Oil

Uncertified OFFM to Measure Igniter Oil

9

Oil or Gas

Default Minimum Fuel Flow Rate

Leave this field blank only for Oil HFF records, where the fuel flow system measures mass flow
rate of oil directly.
Do not leave this field blank for gas fuel flow records.

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2.4.3 Hourly Fuel Flow Data

Mass Flow Rate
Element Name: MassFlowRate
For Oil Fuel Flow Records
Report the Mass Flow Rate of oil either measured directly by a fuel flowmeter system or
calculated from the volumetric flow rate measured by a fuel flowmeter system. All values must be
reported in lb/hr, rounded to one decimal place. This value represents an hourly rate for the period
in which fuel is combusted, not total flow for the hour.
For units using Appendix D to account for SO2 mass emissions, you must report mass flow rate in
order to calculate SO2 mass emissions. Where the density of the oil is determined by the
applicable ASTM procedures referenced in Part 75, use Equation D-3 to calculate the mass flow
rate of oil (in lb/hr).
OIL rate = V oil -rate x D oil
(Equation D-3)
Where:
OILrate =
Voil-rate =
Doil

=

Mass rate of oil consumed per hr (lb/hr)
Volume rate of oil consumed per hr, measured in scfh, gal/hr, barrels/hr, or
m3/hr (rounded to one decimal place)
Density of oil, measured in lb/scf, lb/gal, lb/barrel, or lb/m3

However, for Subpart H units using Appendix D only for heat input determination, you may
measure and report either mass flow rate or volumetric flow rate of oil. If you use volumetric flow
rate and gross calorific value (GCV) to determine hourly heat input rate, leave this field blank.
For Gas Fuel Flow Records
Leave this field blank.
Source of Data Mass Code
Element Name: SourceOfDataMassCode
For Oil Fuel Flow Records
Report one of the following codes to indicate the type of value reported for mass oil flow rate. If
the mass oil flow value was calculated from a volumetric oil flow value, report code 2, regardless
of what Source of Data code was reported for the volumetric oil flow. For emergency fuels where
certified fuel flowmeters are used instead of the maximum unit fuel flow rate for heat input, use
either code 0, 1, 2, or 3 as appropriate. Do not use code 4 unless the maximum unit fuel flow rate
option is used for reporting heat input for the emergency fuel.

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Table 29

Source of Data Mass Codes and Descriptions

Code

Description

0

*Measured Data (using a mass flowmeter)

1

Substitute Data Using Lookback Procedures

2

*Mass Flowrate Derived From Volumetric Value.

3

Maximum Potential Fuel Flow Rate (simplified missing data
procedure for peaking units, only)

4

Emergency Fuel (maximum unit fuel flow rate)

5

Igniter Oil From Tank Measurements

6

Uncertified OFFM to Measure Igniter Oil

9

Default Minimum Fuel Flow Rate

* Including measured or derived mass data, for an emergency fuel where a certified mass or volumetric oil
flowmeter is used.

Do not leave this field blank if fuel flow is reported in the Mass Flow Rate element.
Monitoring System ID
Element Name: MonitoringSystemID
Report the three character Monitoring System ID for the gas or oil fuel flowmeter system.
For hours in which you report the source of the fuel flow rate data (Source of Data Volumetric
Code or Source of Data Mass Code element) as codes 4, 5, or 6 for "Emergency Fuels," where the
maximum unit fuel flow rate is used, or as "Igniter Oil from Tank Measurements," or "Uncertified
OFFM to Measure Igniter Oil," leave the Monitoring System ID blank.

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2.4.3.1 HOURLY PARAMETER FUEL FLOW DATA
HOURLY PARAMETER FUEL FLOW DATA XML Model

Figure 12

HOURLY PARAMETER FUEL FLOW DATA XML Elements

HOURLY PARAMETER FUEL FLOW DATA Overview
Description of Data
For each HOURLY FUEL FLOW DATA (HFF) record, submit HOURLY PARAMETER FUEL FLOW
DATA records to provide the following information, as applicable:
● Gross calorific value (GCV) of the fuel;
● Density of the oil, if oil is measured on a volumetric basis and is required to be converted
to a mass basis (for locations that report SO2);
● Sulfur content or default SO2 emission rate for the fuel, for locations that report SO2;
● Hourly heat input rate and/or SO2, and CO2 mass emission rate values, as calculated from
the hourly fuel flow; and
● NOx emission rate determined using an Appendix E correlation curve for the single fuel.
Submit an HOURLY PARAMETER FUEL FLOW DATA record separately for each parameter as
applicable. For units using Appendix D to account for heat input rate and SO2 and CO2
emissions, for each hour in which any type of oil or gas is burned, report an HOURLY
PARAMETER FUEL FLOW DATA record and the corresponding HFF record(s) for each fuel
combusted during the hour.
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2.4.3.1 Hourly Parameter Fuel Flow Data

HOURLY PARAMETER FUEL FLOW DATA XML Elements

Parameter Code

Element Name: ParameterCode
Report the parameter for the HOURLY PARAMETER FUEL FLOW DATA record using one of the

codes in Table 30:

Table 30

Parameter Codes and Descriptions for HOURLY PARAMETER FUEL FLOW

Code

Description

CO2

CO2 Mass Emission Rate (tons/hr)

DENSOIL

Density of Oil

FC

Carbon-Based F-Factor (for CO2 calculation)

GCV

Gross Calorific Value for Oil or Gas

HI

Heat Input Rate (mmBtu/hr)

NOXR

NOx Emission Rate (lb/mmBtu) (Appendix E )

SO2

SO2 Hourly Mass Rate (lb/hr)

SO2R

Default SO2 Emission Rate (lb/mmBtu)

SULFUR

Sulfur Content (percent by weight)

Parameter Value for Fuel
Element Name: ParameterValueForFuel
If the Parameter Code is "SO2," report the SO2 mass emission rate for the fuel in lb/hr calculated
using Equation D-2, D-4, or D-5 from Appendix D to Part 75.
If the Parameter Code is "CO2," report the CO2 mass emission rate for the fuel in tons/hr
calculated using Equation G-4 from Appendix G to Part 75.
If the Parameter Code is "HI," report the Heat Input rate for the fuel calculated by multiplying
the heat content (GCV) of the fuel by the hourly fuel flow rate. Report this value in units of
mmBtu/hr.
If the Parameter Code is "NOXR," report the NOx emission rate for the fuel in lb/mmBtu
determined using an Appendix E correlation curve.
If the Parameter Code is "GCV," report the gross calorific value used to calculate heat input. Be
sure to use the units of measure that correspond to the units used to report the fuel flow.

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If the Parameter Code is "DENSOIL," report the density of oil used to calculate mass oil flow

rate from volumetric oil flow rate Be sure to use the units of measure that correspond to the

units used to report the fuel flow.

If the Parameter Code is "FC" report the carbon based F-factor for this fuel, as used to calculate

CO2 using equation G-4.

If the Parameter Code is "SULFUR," for oil fuel flow records, if percent sulfur is measured, the
actual value may be reported to the appropriate number of decimal places in Table 30. Use
Table D-4 in Appendix D to Part 75 to determine what value you should report in this field. For
gas fuel flow records report the sulfur content of the gaseous sample in grains/100 scf. Use
Table D-5 in Appendix D to Part 75 to determine the correct value. If the sulfur content for any
sample(s) is 0.04 grains/100 scf or less, report 0.1 grains/100 scf.
If the Parameter Code is "SO2R," report the default SO2 emission rate for natural gas of 0.0006

lb/mmBtu for pipeline natural gas if pipeline natural gas is combusted. If calculating a default

emission rate using Equation D-1H, report the default rate in this field.

For all parameter codes, report the value to the appropriate number of decimal places in Table
31.

Table 31

Precision of Reported Values for Parameter Value for Fuel

Parameter Codes

Number of Decimal Places

CO2, FC, GCV, HI

One

DENSOIL

Five

NOXR

Three

SO2

Oil

One

SO2

Gas

Five

SO2R

Five

SULFUR

Oil

Four

SULFUR

Gas

One

Formula Identifier
Element Name: FormulaIdentifier
Report the code corresponding to the formula listed in the monitoring plan used to calculate the
parameter for the HOURLY PARAMETER FUEL FLOW DATA record. For parameters GCV, FC,
DENSOIL, and SULFUR, leave this field blank. For parameter SO2R, report this field if using a
D-1H formula, otherwise leave it blank.

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2.4.3.1 Hourly Parameter Fuel Flow Data

Sample Type Code
Element Name: SampleTypeCode
Report the type of sample used to determine the GCV, density, or sulfur content using one of the
codes in Table 32.

Table 32

Sample Type Codes and Descriptions

Code

Fuel

Parameters

Description

0

Gas

GCV, SULFUR

Actual Measured Hourly Average Sample from GCH

1

Oil

GCV, DENSOIL,
SULFUR

Actual Measured Value from Oil Composite or Tank Sample

2

Gas

GCV, SULFUR

Actual Measured Value from a Daily Sample

Oil

GCV, DENSOIL,
SULFUR

3

Gas

GCV

Actual Measured GCV from Most Recent Monthly Sampling

4

Gas

GCV, SULFUR

Actual Measured Value from Most Recent Shipment or Lot

5

Gas

SULFUR

Highest Daily Sample in 30 Daily Samples

Oil

GCV, DENSOIL,
SULFUR

Gas

GCV, SULFUR

Oil

GCV, DENSOIL,
SULFUR

Gas

GCV, SULFUR

Oil

GCV, DENSOIL,
SULFUR

Gas

GCV, SULFUR

Oil

GCV, DENSOIL,
SULFUR

6

7

8

Highest Sampled Value in Previous Calendar Year (or a higher
sampled value, superseding the assumed value)

Maximum Value Allowed by Contract (or a higher sampled value,
superseding the assumed value)

Missing Data (Maximum Potential Value for missing data or
emergency fuel from Table D-6 Appendix D section 2.4.1)

Monitoring System ID
Element Name: MonitoringSystemID
For Appendix E NOx rate records (Parameter NOXR), report the three-character Monitoring
System ID for the applicable NOXE system. If there is no applicable NOXE system (e.g., for
emergency fuel records) leave this field blank. Also leave this field blank for other parameters.

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Operating Condition Code
Element Name: OperatingConditionCode
For Appendix E NOx rate records (Parameter NOXR), report the appropriate code from Table 33
that indicates the condition that was used to determine the NOx emission rate for the hour.

Table 33

Operating Condition Codes and Descriptions for HOURLY PARAMETER FUEL FLOW

Code

Description

E

Emergency Fuel or Ignition Fuel

M

Correlation Curve for the Fuel Mixture Has Expired

N

Operating Parameter Is Outside of Normal Limits

U

Uncontrolled Hour

W

Operation Above Highest Tested Heat Input Rate Point on the
Curve

X

Operating Parameter Data Missing or Invalid

Y

Designated Operational and Control Equipment Parameters
within Normal Limits

Z

Operation Below Lowest Tested Heat Input Rate Point on the
Curve

When to Report "E"
Report "E" if the unit burned an emergency or ignition fuel during the hour and you do not have
a separate correlation curve for the emergency fuel. For these hours, report the fuel-specific
maximum potential NOx emission rate (MER) in the ParameterValueForFuel field.
When to Report "M"
When 20 calendar quarters have elapsed since the quarter of the last Appendix E test for a
particular type of fuel, without a subsequent re-test being done, the correlation curve for that fuel
type has expired. From that point on (i.e., starting with the first hour after the end of the 20th
quarter), the previous correlation curve is considered invalid, and you must report the fuelspecific MER for every hour in which the fuel is combusted, until a successful re-test has been
completed. Report "M" for each such hour.
When to Report "N"
Report "N" if a unit operating parameter is outside of normal limits. For example, report "N"
when excess O2 exceeds by more than 2.0 percent the excess O2 value recorded at the same
operating heat input rate during the last NOx emission rate test.

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2.4.3.1 Hourly Parameter Fuel Flow Data

Also, if one or more parameters are outside the normal limits for > 16 consecutive operating
hours, a re-test is required within 30 unit operating days or 180 calendar days (whichever occurs
first -- see Appendix E, Section 2.3). Beginning with the 17th consecutive "out-of-spec"
operating hour and continuing until the re-test is completed, continue to report "N" for each hour
of combustion of the fuel(s) that triggered the need for the re-test.
Use missing data procedures from Appendix E for any hour in which "N" is indicated. These

procedures require you to substitute the highest tested NOx emission rate on the curve for the

fuel.

Note: If fuel flow rate and gross calorific value data are missing, use the missing data

procedures in Appendix D, not Appendix E.

When to Report "U"
For units with add-on NOx controls only. Report "U" if any parameter used to verify proper
operation of the emission controls is outside of normal limits (or the control equipment is not
functioning). For these hours, report the fuel-specific NOx MER in the Parameter Value for Fuel
field.
When to Report "W"
Report "W" if the hourly heat input rate is higher than the maximum heat input rate correlated on
the curve. Use the missing data procedures in section 2.5.2.1 of Appendix E when this occurs.
During your next periodic or quality assurance/quality control related testing, test under
conditions more representative of your maximum potential heat rate. If possible, use the new
maximum heat input rate as the highest heat input point during the next test.
When to Report "X"
For missing or invalid excess O2 or other operating parameter data, report "X" and report the
highest NOx emission rate on the curve for the fuel. This indicates that the hour is not
demonstrated to be within the specified limits in Section 2.3 of Appendix E, but it also is not
demonstrated to be outside the specified limits. (Note that the use of the "X" value is optional,
you may choose instead to treat these hours as out-of-spec.) Hours marked with "N" count
towards the 16 consecutive unit operating hours before retesting is required, while hours marked
with "X" do not count for this purpose. In either case, the data count against the availability of
data where the unit operates within the parameters. If the data availability falls below 90.0
percent, the Agency may require retesting.
When to Report "Z"
Report "Z" if the hourly heat input rate is below the lowest heat input rate. In this case it is not

necessary to verify that the operational parameters are within any specified limits. Report the

same NOx emission rate recorded during testing at the lowest heat input rate.

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Segment Number
Element Name: SegmentNumber
For an Appendix E NOx Emission Rate record (for a unit using one correlation curve for a
consistent fuel mixture), report the Segment Number (1 – 4) indicating which portion of the
correlation curve was used to determine the value for the hour. For operating condition codes N
or X, report the segment number that contains the highest NOx emission rate on the curve for the
fuel. Leave this field blank if the correlation curve was not used for the hour (i.e., the Operating
Condition Code is E, M, U, or W).
Parameter UOM Code
Element Name: ParameterUOMCode
Report the code from Table 34 that identifies the unit of measure in which the Parameter Value
for Fuel is reported. Be sure it corresponds properly to the units of measure in which the Hourly
Fuel Flow rate was reported.

Table 34

Units of Measure Codes and Descriptions for HOURLY PARAMETER FUEL FLOW

Parameter

Code

Description

CO2

TNHR

Tons per Hour

DENSOIL

LBBBL

Pounds per Barrel

LBGAL

Pounds per Gallon

LBM3

Pounds per Cubic Meter

LBSCF

Pounds per Standard Cubic Foot

FC

SCFCBTU

CO2 Standard Cubic Feet/mmBtu

GCV

BTUBBL

BTU per Barrel

BTUGAL

BTU per Gallon

BTULB

BTU per Pound

BTUM3

BTU per Cubic Meter

BTUSCF

BTU per Standard Cubic Foot

BTUHSCF

BTU per 100 Standard Cubic Feet

HI

MMBTUHR

Million BTU per Hour

SO2

LBHR

Pounds per Hour

SO2R, NOXR

LBMMBTU

Pounds per Million BTU

SULFUR

PCT

Percent by Weight

GRHSCF

Grains per 100 Standard Cubic Feet

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2.5 LONG TERM FUEL FLOW DATA
LONG TERM FUEL FLOW DATA XML Model

Figure 13

LONG TERM FUEL FLOW DATA XML Elements

LONG TERM FUEL FLOW DATA Overview
Description of Data
If you have a qualifying low mass emissions (LME) unit or group of units and use a long term
fuel flow system to measure oil or gas to calculate heat input, report a LONG TERM FUEL FLOW
DATA record for each long term oil (LTOL) monitoring system and each long term gas (LTGS)
monitoring system used during the quarter or reporting period.
For a group of LME units served by a common pipe (or supply tank), you must define a LTOL or
LTGS monitoring system in the monitoring plan for the pipe or tank. In both cases (i.e., for
common pipe or tank), the pipe or tank ID number must begin with a "CP" prefix (e.g., CP001).
If two or more common pipes or tanks of different fuel types supply the same group of LME
units, you must define a separate LTOL or LTGS system for each pipe or tank. If two or more
pipes or tanks supply the same type of fuel to a group of LME units, you may represent it as a
single LTOL or LTGS system.

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2.5 Long Term Fuel Flow Data

LONG TERM FUEL FLOW DATA XML Elements
Unit ID or Stack Pipe ID
Element Name: UnitID or StackPipeID
Report either the Unit ID or Stack Pipe ID for the long term fuel flow location. This is the
alphanumeric code assigned by a source to identify a unit, stack, or pipe.
Monitoring System ID
Element Name: Monitoring System ID
Report the monitoring system ID, either LTOL or LTGS, for the long term fuel flow (LTFF)
system.
Fuel Flow Period Code
Element Name: FuelFlowPeriodCode
If this location is subject to an ozone season program and this is a second quarter emissions file,
report either "A" to indicate that this record contains long term fuel flow for the month of April,
or "MJ" to indicate that this record contains long term fuel flow for May and June. Otherwise,
leave this field blank.
LTFF Value
Element Name: LongTermFuelFlowValue
Report the total fuel flow recorded for the quarter, reporting period, or fuel flow period to zero
decimal places. If you measure in units other than gallons, pounds or standard cubic feet,
convert the reading to allowable units by using conversion equations.
Instructions for Using Billing Records
● If you have daily billing records, then use the daily fuel usage to apportion the fuel flow
on a daily basis to hours within the ozone season or quarter beginning on the first
operating day of the ozone season or quarter and ending on the last operating day of the
ozone season or quarter.
Example 1. If a billing period starts on June 15 and ends on July 16 and the bill includes
daily usage, use the daily quantities to determine which fuel was combusted during June
(attributed to the second quarter) and which fuel was combusted during July (attributed to
the third quarter).
● If the bill does not specify daily fuel usage, apportion fuel based on unit output, as
reported in the OPERATING HOUR DATA record.
Example 2. If the billing period starts on June 15 and ends on July 16, and the bill only
has total fuel combusted during the period, apportion the fuel into June and July based on
the unit output for the billing period. Thus, if 75 percent of the unit output between June

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15 and July 16 occurred during June, then apportion 75 percent of the total fuel into June
and 25 percent into July.
● It is the responsibility of the owner/operator to obtain all necessary billing records in time
to ensure timely quarterly report submissions.
Instructions for Using Tank Drop Measurements
● For year-round reporting, measure the tank volume (the beginning and ending LTFF
measurement) within no more than 48 hours of the beginning or end of a quarter.
Example 3. If you measure the level of oil in a tank on December 30 or 31 or on January
1 or 2, use this measurement (compared to the baseline value at the beginning of the
quarter) to calculate the amount of fuel combusted during the quarter (even if the
measurement was taken in January). Use this measurement as the baseline for
determining the amount of fuel combusted during the next quarter. When apportioning
heat input based on unit output only, use output from the beginning and end of the
quarter, not the output corresponding to the beginning and end of the actual measurement
period.
● Perform as many measurements as necessary to accurately determine fuel usage during
the measurement period. The Agency recommends performing measurements before and
after fuel is added to a tank unless you know the exact volume of fuel added to the tank.
● If a unit operated for only a very short period or used only a very limited amount of fuel
during a quarter or reporting period so that a tank drop measurement will not yield an
accurate estimate of the fuel combusted during the quarter, use the unit's maximum rated
heat input for each hour of operation during that quarter. Report a method of
determination code (MODC) of "45" in the DERIVED HOURLY VALUE DATA (DHV)
record for Total Heat Input (HIT) for each hour.
Instructions for Using Certified Fuel Flowmeters
● When a certified Appendix D fuel flowmeter is used for long term fuel flow purposes,
you are required to record hourly fuel flow rates. You must also submit MONITORING
SYSTEM FUEL FLOW DATA in the monitoring plan and must submit the results of all
periodic fuel flowmeter quality assurance tests. However, reporting of hourly fuel flow
rate information is not required. Therefore, do not report HOURLY FUEL FLOW DATA
(HFF) records for LME units.
● Use the recorded hourly fuel flow rates, fuel usage times (if available), and the density of
the fuel (if needed) to determine the total mass or volume (as applicable) of each type of
fuel combusted during the reporting period. Then, use Equation LM-2 or LM-3 in
§75.19, as appropriate, to calculate the heat input from each type of fuel combusted
during the reporting period. Add together all of the reporting period heat input values for
all fuels, according to Equation LM-4. Then, apportion the total heat input for the
reporting period to each operating hour in the period, using Equations LM-5 through LM­
8A (as applicable) replacing the term "quarter" with the term "reporting period."
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2.5 Long Term Fuel Flow Data

● When calculating the total mass or volume of fuel combusted, if hourly fuel usage times
are not available, use a value of 1.00 for each operating hour in the reporting period.
● If any fuel flowmeter data are missing for any hour(s) in the reporting period, you must
provide substitute data for those hours, using either: (1) the load-based missing data
procedures in Appendix D (if these procedures are programmed in the Data Acquisition
and Handling System (DAHS)); or (2) the maximum system fuel flow rate in
MONITORING SYSTEM FUEL FLOW DATA record).
Long Term Fuel Flow UOM Code
Element Name: LongTermFuelFlowUOMCode
Report the units of measure in which you are reporting fuel flow using one of the following
uppercase codes in Table 35.

Table 35

Long Term Fuel Flow UOM Code

Code

Description

GAL

Gallons (oil)

LB

Pounds (oil)

SCF

Standard Cubic Feet (gas)

Gross Calorific Value
Element Name: GrossCalorificValue
Report the heat content or gross calorific value (GCV) of the fuel from Table LM-5 of §75.19 or
the highest GCV recorded in the previous calendar year from fuel sampling and analysis
according to the procedures of Appendix D to Part 75. If you measure in units other than those
listed below, convert to an allowable unit by using appropriate conversion equations. Report the
value to one decimal place.
GCV Units of Measure Code
Element Name: GCVUnitsofMeasureCode
Report the units of measure for GCV using one of the uppercase codes in Table 36.

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2.5 Long Term Fuel Flow Data

March 07, 2012September 19, 2012

Table 36

GCV Units of Measure Code

Code

Description

BTUGAL

Btu per Gallon

BTULB

Btu per Pound

BTUSCF

Btu per Standard Cubic Feet

Total Heat Input
Element Name: TotalHeatInput
Calculate and report the total heat input (mmBtu) measured by the LTFF system for the quarter
or reporting period using the appropriate heat input formula from §75.19 (e.g., LM-2, LM-3).
Report the value to zero decimal places.
Specific Considerations
● If this system is the only LTFF system used for the unit or group of units, apportion this
heat input to the unit operating hours in the quarter (or reporting period) using the
appropriate equation in §75.19. If two or more LTFF systems are used during the quarter
or reporting period, sum the total heat input values from all systems before apportioning
heat input to the unit operating hours.
● For a single LME unit which is not part of a group of LME units, the total heat input
values for all LTFF systems used during the quarter must equal the quarterly unit heat
input value reported in the SUMMARY VALUE DATA record.
● For a group of LME units served by one or more common pipes or tanks, you must report
both LTFF and SUMMARY VALUE DATA records under each common pipe (or tank) ID
number. For each common pipe or tank ID, the total heat input reported in the LTFF
record(s) must equal the quarterly heat input reported in the SUMMARY VALUE DATA
record.
● For any hour during which the unit is burning a secondary fuel that is not measured by a
long term fuel flow system, you must calculate the total heat input for the hour using the
maximum rated hourly heat input rate for the unit. Report an MODC of "45" in the DHV
record for (HIT) for the hour.
● If a unit (or group of units linked to a common pipe) using LTFF to determine heat input
burns fuel, but does not generate any load during the reporting period, apportion the total
heat input based on operating time instead of load using the appropriate equation in
§75.19.

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