QA - Flow Rate Verification

40 CFR Part 58 Appendix A sections 3.2.3, 3.3.2, and 3.3.4.1 describe requirements for a one-point flow rate verification check on automated and manual monitors used to measure PM10, PM10-2.5, PM2.5, and Pb (Pb-TSP and Pb-PM10). To perform the flow rate verification check, the monitor’s normal flow rate is checked using a certified flow rate transfer standard. This check is performed at different frequencies depending on the type of monitor being used. For manual method hi-vol samplers, flow rates must be verified on at least a quarterly basis. For manual method lo-vol samplers, flow rates must be verified on at least a monthly basis. For automated methods, flow rates must also be verified monthly.

Particulate monitors using automated methods usually sample continuously and report hourly average values as raw data to AQS. When this check is performed, if the hourly average raw data value is not available for reporting, then a null value and null data code is reported for that hour. The known flow rate of the transfer standard, and the measured (or indicated) value from the monitor, are recorded by the operator for entry into AQS for that monitor on that date. For manual monitors, the check is performed prior to or after sampling so there is no data loss.

A field by field description of the Flow Rate Verification transaction follows.

Examples:

QA - Flow Rate Verification transaction in default mode
QA|I|Flow Rate Verification|0145|06|067|0010|81102|4|20200121|1|122|118|16.7|16.63
QA - Flow Rate Verification transaction in Tribal mode
QA|I|Flow Rate Verification|0055|TT|905|9021|88101|1|20200102|1|145|118|16.7|16.5

Format

QA - Flow Rate Verification transaction format

Seq.

Name

Description

Formatting Rules

Required

Key

1

Transaction Type

Quality Assurance transaction identifier.

Must = QA

Always

2

Action Indicator

Indicator for Insert, Update, or Delete action.

Must = I, U, or D

Always

3

Assessment Type

Indicates the specific QA assessment associated with the transaction.

Must = Flow Rate Verification

Always

Y

4

Performing Agency

Agency Code of organization performing assessment.

Must exist in AGENCIES reference table.

Optional; defaults to user agency

5

State Code / Tribal Indicator

The FIPS state code of the monitor, or “TT” to indicate that the next field on the transaction is a Tribal code.

Must exist in STATES Reference Table or be ‘TT’ for Tribal Site

Always

Y

6

County Code / Tribal Code

The FIPS County Code of the site. If the previous field on the transaction contains “TT”, then the Tribal Code of the site.

Must exist in COUNTIES (for state) or TRIBAL_AREAS Reference table

Always

Y

7

Site Number

Four digit number to uniquely identify site in county and/or tribe.

Must exist in SITES table with {State Code, county Code} or Tribal Code

Always

Y

8

Parameter Code

The AQS parameter code assigned to the monitor in AQS.

Must exist in PARAMETERS reference table.

Always

Y

9

POC

Parameter Occurrence Code: One or two digit number identifying a specific monitor for a parameter at the site.

Must exist in MONITOR table for non-Insert actions.

Always

Y

10

Assessment Date

Date that the assessment was performed

YYYYMMDD.

Always

Y

11

Assessment Number

A unique number associated with an assessment performed at a site on a given day. Value should be “1” unless additional same assessments are performed.

Integer.

Always

Y

12

Monitor Method Code

The sampling methodology of the monitor being assessed.

Must exist in SAMPLING METHODOLOGIES reference table.

Insert

13

Reported Unit

Units associated with the assessment.

Must exist in UNITS reference table, and unit code must be for Flow units type.

Unless Delete

14

Monitor Flow Rate

The measured flow rate provided by the monitor being assessed.

Decimal.

Insert

15

Assessment Flow Rate

The flow rate of the flow transfer standard.

Decimal.

Insert