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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX C<br />

analytical techniques and off-site laboratory analysis. There are no restrictions on the<br />

usability of definitive data.<br />

2.13 Data Quality Indicators<br />

The precision, accuracy, representativeness, completeness, and comparability (PARCC) parameters are<br />

indicators of data quality. Ideally, the end use of the measurement data should define the necessary<br />

PARCC parameters. The following sections discuss data quality indicators as they apply to measurement<br />

of data, including field and laboratory analyses. Limits for precision and accuracy are matrix, method,<br />

and project specific and should be specified in the project-specific QAPP addendum.<br />

4.1.3 Precision<br />

Analytical precision is the measurement of the variability associated with duplicate analyses. Precision<br />

can be determined by analysis of field duplicate samples, laboratory control sample or matrix spike<br />

duplicate samples, or laboratory duplicate sample analysis. Precision is reported as the relative percent<br />

difference (RPD) between the analyses. .<br />

4.1.3.1 Field Precision Objectives<br />

Field precision is assessed through the collection and analysis of field duplicates and replicates at a<br />

frequency of 1 duplicate for every 10 water samples and 1 replicate for every 10 soil/sediment samples.<br />

Precision of field instruments is in accordance with the following:<br />

Instrument Objective Corrective Action<br />

Photoionization Detector (PID) 20 percent from calibration<br />

reading at a specified space<br />

Return instrument for<br />

maintenance<br />

setting<br />

Flame Ionization Detector 20 percent from calibration<br />

reading at a specified space<br />

setting<br />

Recalibrate<br />

4.1.3.2 Laboratory Precision Objectives<br />

Precision will be determined through the comparison of matrix spikes and matrix spike duplicates<br />

(MS/MSD) for the organic analytical work performed at Kirtland AFB. The laboratory will select 1<br />

sample in 20 project samples and split the sample into three aliquots. The first aliquot will be analyzed<br />

routinely for organic target compounds while the aliquot(s) will be spiked with known quantities of the<br />

parameters of interest prior to analysis. The relative percent difference (RPD) will be calculated and<br />

used as an indication of the precision for the analyses performed.<br />

Precision for the inorganic analyses will be evaluated by comparing laboratory duplicate analysis of an<br />

environmental sample. The laboratory will select 1 sample in every 20 project samples and split the<br />

samples into three aliquots. The first aliquot will be analyzed routinely for inorganic parameters, while<br />

the second aliquot will serve as a duplicate, and the third aliquot will be spiked with known quantities of<br />

target analytes prior to analysis. The RPD of the unspiked duplicate samples will be calculated and used<br />

as a measure of precision for the inorganic analyses.<br />

The equations to be used for precision are presented in Section 13.0 of this QAPP. Precision control<br />

limits (objectives) will be as specified by the analytical methods.<br />

Kirtland AFB<br />

Quality Assurance Project Plan C-20 April 2004

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