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QUALITY CONTROL REPORT In order to provide you with the means of assessing the quality Of the data in our report, D&M Laboratories reports the results of Quality Control samples analyzed with your samples. The Quality Control samples provide the following QC information: The Method Blank (*O) monitors the level of contamination introduced be reagents or glassware. A minimum of one MB is run per batch of 20 samples or less. The Method Blank Spike (MBS) measures the accuracy of analytical techniques and is not subject to matrix effects. A minimum of one MBS is run per batch of 20 samples or less. The Matrix Spike (MS) measures the accuracy of the method for a matrix type. Due to the high variability within matrix types and the necessity of batching samples from varied sources, matrix spike information from one sample is not necessarily relevant to other samples on the batch. A minimum of two matrix spikes, MS and MSD are run per batch of 20 samples or less. The sample selected for the matrix spike is designated MX, and may or may not have been submitted by the recipient of this report. The Matrix Spike Duplicate (MSD), along with the MS, is used to monitor the precision (RPD) of the method and to indicate possible non homogeneity of the sample matrix. Equations used for determining percent recovery and Relative Percent Difference (RPD) are as follows: MBS % Recovery = (MBS result / MBS spike level) x 100 MS % Recovery = [(MS result - MX result) 1 MS spire level] x 100 RPD = I I MS result - MSD result I / [(MS result + MSD result) / 2]} x 100 We continue to strive to improve the quality of service to our clients. We welcome any questions or comments you may have about this information, or about D&M Laboratories in general. Please contact a Project Manager for further information. RDL = Report Detection Limit ND = Not Detected Qcx�,mns�s