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Matrix Spike (MS) Recovery Statement <br />The percent recoveries (%R) obtained from the MS analyses are evaluated when the <br />sample concentration is less than four times (4X) the spike concentration added. The MS <br />met the recommended quality control acceptance criteria for percent recoveries for all <br />applicable analytes with the exception of mercury as indicated by the "*" qualifier. <br />Duplicate Relative Percent Difference (RPD) Statement <br />The RPD obtained from the designated sample duplicate (DUP) is evaluated based on <br />acceptance criteria of 20% when the sample is >5X the contract required detection limit <br />(RL). In cases where either the sample or duplicate value is less than 5X the RL, a control <br />of RL is used to evaluate the DUP results. All applicable analytes met these requirements. <br />Serial Dilution % Difference Statement <br />The serial dilution is used to assess matrix suppression or enhancement. Raw element <br />concentrations that are 25X the IDL for CVAA, 50X the IDL for ICP, and 100X the IDL <br />for ICP -MS analyses are applicable for serial dilution assessment. All applicable analytes <br />met the acceptance criteria of less than 10% difference (%D) with the exception of <br />mercury. <br />Technical Information <br />Holding Time Specifications <br />GEL assigns holding times based on the associated methodology, which assigns the date <br />and time from sample collection of sample receipt. Those holding times expressed in <br />hours are calculated in the AlphaLIMS system. Those holding times expressed as days <br />expire at midnight on the day of expiration. All samples in this SDG met the specified <br />holding time. <br />Preparation/Analytical Method Verification <br />All procedures were performed as stated in the SOP. <br />Sample Dilutions <br />Dilutions are performed to minimize matrix interferences resulting from elevated mineral <br />element concentrations present in solid samples and/or to bring over range target analyte <br />concentrations into the lineae- calibration range of the instrument. The samples in this <br />SDG did not require dilutions. ` <br />Preparation Information <br />The samples in this SDG were prepared exactly according to the cited SOP. <br />Miscellaneous Information <br />Nonconformance Documentation <br />Nonconformance reports are generated to document any procedural anomalies that may <br />deviate from referenced SOP or contractual documents. The following NCR was <br />generated for this SDG: NCR ID 503006. A copy is included in the Miscellaneous Data <br />Page 14 of 36 <br />