QA - SRP

SRP = Stanard Reference Photometer

On February 8, 1979 (Federal Register, 44:8221-8233), the U.S. Environmental Protection Agency amended Appendix D of Title 40, Code of Federal Regulations (CFR), Part 50, to prescribe a calibration procedure for the calibration of reference methods for measuring ozone in the atmosphere. The procedure is based on the use of ultraviolet (UV) photometry as the authoritative standard for ozone and allows the use of transfer standards for the calibration of ambient ozone monitors, provided such transfer standards are adequately referenced to a UV ozone standard of higher authority (level) and traceability.

The document discusses how various levels of transfer standards are verified and traceable to an authoritative NIST standard.

The transaction can be used to report:

  1. NIST Level 1 SRP verifications to the EPA RTP Level 1 SRPs

  2. EPA RTP Level 1 SRPs to EPA Regional Level 1 SRPs

  3. EPA Regional Level 1SRPs to monitoring organization Level 2 transfer standards

  4. monitoring organization Level 2 transfer standards to monitoring organization Level 3 transfer standards

  5. monitoring organization Level 3 transfer standards to monitoring organization Level 4 transfer standards

  6. 6 by 6 verifications

  7. Re-verification (new point to 6 by 6)

In the case of each transaction the authoritative standard is the standard “closer” in traceability to the NIST standard.

Format

QA - Ozone SRP and Ozone Transfer Standard 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 = SRP

Always

Y

4

Verification Type

6X6 is for the initial verification of a new standard ozone generator. “Standard” is for a routine SRP assessment.

Must = 6X6 or Standard

Always

Y

5

Performing Agency

Agency Code of organization performing assessment.

Must exist in AGENCIES reference table.

Always

Y

6

PQAO Code

Agency Code of organization responsible for the quality of data for Monitoring Organization.

Must exist in AGENCIES Reference Table.

Always

Y

7

Parameter Code

The AQS parameter code.

Must = 44201

Always

Y

8

Authoritative Standard ID

Unique ID for Authoritative standard.

Must exist on SRP STANDARDS reference table.

Always

Y

9

Authoritative Standard Level

Primary EPA standard is Level 1, those validated against it are level 2, and those validated against level 2 standards are level 3.

Number; must be 1, 2, or 3.

Always

Y

10

Transfer Standard ID

Unique ID code (serial number) for transfer standard

Text (up to 40 characters).

Always

Y

11

Transfer Standard Level

Level 1, 2, 3, 4 transfer standard has to be equal or a higher number then the Authoritative Standard

Decimal; must be >= authoritative standard.

Always

Y

12

Assessment Date

Date that the assessment was performed.

YYYYMMDD.

Always

Y

13

Assessment Number

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

Integer.

Always

Y

14

Reported Unit

Units associated with the assessment concentrations (Monitor Concentration and Check Standard Concentration).

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

Unless Delete

15

Transfer Standard Value 1

Measurement from instrument being assessed.

Decimal.

Insert

16

Authoritative Standard Value 1

Measurement from authoritative standard instrument.

Decimal.

Insert

17

Transfer Standard Value 2

Measurement from instrument being assessed.

Decimal.

Insert

18

Authoritative Standard Value 2

Measurement from authoritative standard instrument.

Decimal.

Insert

19

Transfer Standard Value 3

Measurement from instrument being assessed.

Decimal.

Insert

20

Authoritative Standard Value 3

Measurement from authoritative standard instrument.

Decimal.

Insert

21

Transfer Standard Value 4

Measurement from instrument being assessed.

Decimal.

Insert

22

Authoritative Standard Value 4

Measurement from authoritative standard instrument.

Decimal.

Insert

23

Transfer Standard Value 5

Measurement from instrument being assessed.

Decimal.

Insert

24

Authoritative Standard Value 5

Measurement from authoritative standard instrument.

Decimal.

Insert

25

Transfer Standard Value 6

Measurement from instrument being assessed.

Decimal.

Insert

26

Authoritative Standard Value 6

Measurement from authoritative standard instrument.

Decimal.

Insert

27

Transfer Standard Value 7

Measurement from instrument being assessed.

Decimal.

Insert

28

Authoritative Standard Value 7

Measurement from authoritative standard instrument.

Decimal.

Insert

29

Transfer Standard Value 8

Measurement from instrument being assessed.

Decimal.

Insert

30

Authoritative Standard Value 8

Measurement from authoritative standard instrument.

Decimal.

Insert

31

Transfer Standard Value 9

Measurement from instrument being assessed.

Decimal.

Insert

32

Authoritative Standard Value 9

Measurement from authoritative standard instrument.

Decimal.

Insert

33

Transfer Standard Value 10

Measurement from instrument being assessed.

Decimal.

Insert

34

Authoritative Standard Value 10

Measurement from authoritative standard instrument.

Decimal.

Insert