QA - Pb Analysis Audit
----------------------

Requirements for the Pb (lead) analysis audit program can be found in 40 CFR Part 58 Appendix A section 3.4.6.

Each laboratory analyzing Pb filters receives Pb strips that are prepared with a known amount of Pb. The Pb strips can be supplied by USEPA (OAQPS), or made by the PQAO's analyzing laboratory.

The analyzing laboratory analyzes the strip and reports the mass to the PQAO (or reporting organization) for entry into AQS. The known mass, and the analyzing laboratory's determination of the mass, comprise the pair of values submitted on the transaction, and are used to calculate QA statistics.

Pb strips should be analyzed every quarter (or sampling quarter for PSD). Three samples in each of 2 ranges are required every quarter, distributed over the quarter evenly. The ranges are defined as equivalent ambient Pb concentrations of:


.. list-table:: Threshold Values for the Pattern Tests
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   * - Parameter
     - Range
     - Equivalent ambient Pb concentration (ug/m3)
     - Acceptable Levels
   * - TSP LC (14129)
     - 1
     - 30 - 100% of Pb NAAQS
     - 4 - 40 ug/strip[1]
   * - TSP LC (14129)
     - 2
     - 200 - 300% of Pb NAAQS
     - 41 - 125 ug/strip
   * -
     -
     -
     -
   * - PM10 LC (85129)
     - 1
     - 30 - 100% of Pb NAAQS
     - 1 - 4 ug/filter
   * - PM10 LC (85129)
     - 2
     - 200 - 300% of Pb NAAQS
     - 5 - 11 ug/filter    


[1]Acceptable audit levels based on assessment of various monitoring organizations.



Format
^^^^^^

.. list-table:: QA - Pb Analysis Audit transaction format
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   * - Seq.
     - Name
     - Description
     - Formatting Rules
     - Required
     - Key
   * - 1
     - `Transaction Type <Transaction%20Type.html>`_
     - Quality Assurance transaction identifier.
     - Must = QA
     - Always
     - 
   * - 2
     - `Action Indicator <Action%20Indicator%20for%20Transaction.html>`_
     - Indicator for Insert, Update, or Delete action.
     - Must = I, U, or D
     - Always
     - 
   * - 3
     - `Assessment Type <Assessment%20Type.html>`_
     - Indicates the specific QA assessment associated with the transaction.
     - Must = Pb Analysis Audit
     - Always
     - Y
   * - 4
     - `Performing Agency <Performing%20Agency.html>`_
     - Agency Code of organization performing assessment.
     - Must exist in AGENCIES reference table.
     - Always
     - 
   * - 5
     - `PQAO Code <PQAO%20Code.html>`_
     - Agency Code of organization responsible for the quality of data for Monitoring Organization.
     - Must exist in AGENCIES Reference Table.
     - Always
     - 
   * - 6
     - `Parameter Code <Parameter%20Code.html>`_
     - The AQS parameter code assigned to the monitor in AQS.
     - Must exist in PARAMETERS reference table.
     - Always
     - Y
   * - 7
     - `Assessment Date <Assessment%20Date.html>`_
     - Date that the assessment was performed
     - YYYYMMDD.
     - Always
     - Y
   * - 8
     - `Assessment Number <Assessment%20Number.html>`_
     - 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
   * - 9
     - `Reported Unit <Reported%20Unit.html>`_
     - Units for mass of lead on test strip.  Required by Part 58.3.3.4.(c) to be unit code 077 (micrograms).
     - Must = 077
     - Unless Delete
     - 
   * - 10
     - `Laboratory Response Value 1 <Lead%20Analysis%20Level%201%20Lab%20Response.html>`_
     - The mass of lead reported by lab for level 1.  
     - Decimal.
     - Insert
     - 
   * - 11
     - `Assessment Mass 1 <Assessment%20Mass.html>`_
     - The known mass of lead on the test strip for level 1.  
     - Decimal (must be in range of mass values for audit level 1 in AUDIT LEVELS table in database).
     - Insert
     - 
   * - 12
     - `Laboratory Response Value 2 <Lead%20Analysis%20Level%202%20Lab%20Response.html>`_
     - The mass of lead reported by lab for level 2.  
     - Decimal.
     - Insert
     - 
   * - 13
     - `Assessment Mass 2 <Assessment%20Mass.html>`_
     - The known mass of lead on the test strip for level 2.  
     - Decimal (must be in range of mass values for audit level 1 in AUDIT LEVELS table in database).
     - Insert
     -