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RECEIVED <br />FEB 0 9 2011 <br />Matrix Spike (MS) Recovery Statement <br />The percent recoveries (%R) obtained from the MS analyses are evaluated wh I ENTAL HEALTH <br />concentration is less than four times (4X) the spike concentration added. All app icabIV. ENT <br />met the acceptance criteria. <br />Duplicate Relative Percent Difference (RPD) Statement <br />The RPD obtained from the designated sample duplicate (DUP) is evaluated based on acceptance <br />criteria of 20% when the sample is >5X the contract required detection limit (RL). In cases <br />where either the sample or duplicate value is less than 5X the RL, a control of +/-RL is used to <br />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/MDL for CVAA, 50X the IDL/MDL for ICP, and 100X the <br />IDL/MDL for ICP -MS analyses are applicable for serial dilution assessment. All applicable <br />analytes met the acceptance criteria of less than 10% difference (%D). <br />Technical Information <br />Holding Time Specifications <br />GEL assigns holding times based on the associated methodology, which assigns the date and <br />time from sample collection of sample receipt. Those holding times expressed in hours are <br />calculated in the AlphaLIMS system. Those holding times expressed as days expire at midnight <br />on the day of expiration. All samples in this SDG met the specified 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 linear calibration range of the instrument. The samples in this SDG did <br />not require dilutions. <br />Preparation Information <br />The samples in this SDG were prepared exactly according to the cited SOP. <br />Miscellaneous Information <br />Electronic Packaging Comment <br />This data package was generated using an electronic data processing program referred to as <br />virtual packaging. In an effort to increase quality and efficiency, the laboratory has developed <br />systems to generate all data packages electronically. The following change from traditional <br />packages should be noted: <br />Analyst/peer reviewer initials and dates are not present on the electronic data files. Presently, all <br />Page 30 of 39 <br />