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• xe = measured value for spiked sample, xu = measured value for unspiked sample, and K = known value of the spike in the sample. Using the following equation yields the percent recovery (%R) • %R = 100 (x, - x,)/ K BLANK: see Equipment Rinsate, Method Blank, Trip Blank. CONTROL SAMPLE: A QC sample introduced into a process to monitor the performance of the system. DATA QUALITY A statement of the overall level of uncertainty that a OBJECTIVES (DQOs) : decision-maker is willing to accept in results derived from environmental data (see reference 2, EPA/QAMS, July 16, 1986) . This is qualitatively distinct from quality measurements such as precision, bias, and detection limit. DATA VALIDATION: The process of evaluating the available data against the project DQOs to make sure that the objectives are met. Data validation may be very rigorous, or cursory, depending on project DQOs. The available data reviewed will include analytical results, field QC data and lab QC data, and may also include field records. DUPLICATE: see Matrix Duplicate, Field Duplicate, Matrix Spike Duplicate. EQUIPMENT BLANK: see Equipment Rinsate. EQUIPMENT RINSATE: A sample of analyte-free media which has been used to rinse the sampling equipment. It is collected after completion of decontamination and prior to sampling. This blank is useful in documenting adequate decontamination of sampling equipment. ESTIMATED The lowest concentration that can be reliably achieved QUANTITATION within specified limits of precision and accuracy during LIMIT (EQL) : routine laboratory operating conditions. The EQL is generally 5 to 10 times the MDL. However, it may be nominally chosen within these guidelines to simplify data reporting. For many analytes the EQL analyte concentration is selected as the lowest non-zero standard in the calibration curve. Sample EQLs are highly matrix- dependent. The EQLs in SW-846 are provided for guidance and may not always be achievable. ONE - 24 Revision 1 July 1992