Main Page Position Paper BLANKS SPIKES 2ndCOLUMN DUPLICATE

DATA REVIEW AND VALIDATION

Data Validation is a systematic effort to review data to assure acceptable quality.

Data verification demonstrates that a set of data meets a specified set of criteria. This is usually the extent of the data review process conducted for most projects.

The purpose of data validation is to demonstrate that a set of data meets the requirements of the user. This includes data verification plus determination of the useability of data which is outside the specified criteria.

For example, if a project is required to show that the benzene concentration in water is less than 5 ppb and the specified criteria for spike recoveries is 75 to 125%, a portion of the data from a batch having spike recovery of 50% is useable for the 5ppb requirement. All samples with results less than 2.5 ppb benzene after conversion to 100% recovery are useable for showing a concentration less than 5.0 ppb benzene.

(2.5 x 100/50 = 5.0)

IN SUMMARY: Do you want your data reviewed by a data verifier or a data validator???