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• 'Test Methods for Evaluating Solid Wastes, Physical/Chemical Methods," SW 846, Third Edition with updates, U.S. EPA, March 1995. Data validations will include a data completeness check of each data package, a transcription check for sample results, and a thorough review of all laboratory reporting forms. Specifically, this review will include: review of data package completeness review of the required reporting summary forms to determine if the QC requirements were met and to determine the effect of exceeded QC requirements on the precision, accuracy, and sensitivity of the data • review of additional QA/QC parameters, such as field duplicates and field blank contamination, to determine technical usability of the data application of standard data quality qualifiers to the data In addition, each data validation will include a comprehensive review of the following QA/QC parameters as indicated in the National Functional Guidelines: holding times (to assess potential for degradation that will affect accuracy) • blanks (to assess contamination for all compounds) • System Monitoring Compounds (to assess method accuracy) MS/MSD or Laboratory Fortified Blanks (to assess accuracy of the methods and precision of the method relative to the specific sample matrix) Internal Standards (to assess method accuracy and sensitivity) Target Compound Identification Compound Quantitation Limits (to assess sensitivity as compared to project-specific requirements) System Performance (to assess accuracy and precision) Field Duplicate RPDs (to assess precision of the method relative to field sampling techniques, the specific sample matrix, and representativeness of the sample aliquot to the area sampled) A1.3.2 Data Usability Assessment LFR will assess perform a data usability assessment. The usability assessment will be performed based on Guidance for Data Usability in Risk Assessment (U.S. EPA 1992) and best professional judgment. LFR will delineate major and minor deficiencies in the data, their effects on the reported results, and determination of usability for each compound reported in each sample included in the data package. The usability assessment will provide an overall summary of data quality, defining acceptability or problems with accuracy, precision, sensitivity, and representativeness of the results with clear guidance to the data users (e.g., risk assessors) of the uncertainties in the data Sampling Plan for Small Waste Disposal Areas (final).doc A-3