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Table F. MERC Data Quality Objectives for Water Quality Analyses
Data Quality
Indicator
Evaluation Process
Performance Measure
MERC DQO
Precision
Analyze at least 10 % of samples
in duplicate.
Relative Percent
Difference (RPD).
< 20 % average RPD.
Accuracy
Where applicable, use a certified
reference standard to determine
differences between the measured
and nominal reference standard
concentrations.
Percent Difference (%D).
< 20 % average %D.
Representativeness Ensure pre-treatment/control and
post-treatment/treatment samples
are handled and analyzed in the
same manner.
N/A – Qualitative term.
N/A – Qualitative term.
Comparability
Routine procedures are conducted
according to appropriate SOPs to
ensure consistency between tests.
Ensure correct implementation of
SOPs.
N/A – Qualitative term.
N/A – Qualitative term.
Completeness
Calculate percentage of valid
samples analyzed out of the total
number of samples collected.
Percent Completeness
(%C)
Greater than 90 %C.