Draft Data Validation Plan Review Form (Page 19 of 29) in pdf

Draft Data Validation Plan Review Form Page 19

Draft Data Validation PRF-Tier II

Date: March 2, 2004

Page 19

Revision: 4.0

3.0

Semi-Volatile Data Review - Internal Standards

Internal Standards

Internal standards are the primary means of identifying and quantifying volatile organic compounds in samples. The evaluation

of internal standard data is therefore critical to data validation. Internal standards are added to each sample and all QC

samples. Internal standards are added to samples and blanks, and are evaluated in comparison to the initial calibration.

Internal standard area counts must not vary by more than a factor of two (-50 to +/- 100%) from the associated calibration

standard. In addition, the retention time of internal standards must not vary by more than +/- 30 seconds from the associated

calibration standard. The internal standards and their associated target compounds are listed in Table 4.

3.1

Is raw data available to determine if the internal

Note actions taken, such as when the facility was contacted,

standards are within criteria?

facility personnel and when the information was submitted:

Action: No action is necessary if the data is present. If it is not, the

facility should provide the data from its laboratory. If the data is

not available, the Tier II Data Validator may qualify data based

upon professional judgement.

3.2

Are the area counts for internal standards for the sample

or blank outside of +50% of the area for the associated

12-hour standard (CCV)?

Action: All positive results associated with an internal standard

outside of the criteria should be qualified as “J.”

Non-detected compounds quantified using an internal standard

whose area count is greater than 100% should not be qualified.

Non-detected compounds quantified with an internal standard

whose area count is less than 50% of the associated calibration

standard should be qualified as, “UJ.”

If extremely low area counts are associated with the internal

standards, qualify all associated target compounds as “R.”

3.3

Do any internal standards retention times vary by more

than 30 seconds compared to the 12-hour calibration

standard?

Action: The Tier II Data Validator should request raw data

chromatograms and assess whether false positives or negatives

exist for any target compounds associated with that internal

standard. Based upon this evaluation, the data may either be

qualified as “J” or “R” using professional judgement.

Draft Data Validation Plan Review Form Page 19

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