721 E MARINE VIEW DR 2016-01-01 MF Import

1 3700 Lakevilk Hiphway,Petaluma,CA 9495r P.O.Boz 808021,PeteNme,CA 949758021 Teleplane:(707)783�8215 FAX(70'�763�085 QUALITY CONTROL REPORT In order to provide you with the means of assessing the quality of tt�e data in our report, — D&M Laboratories reports che results of Quality Control samples analyzed with your samples. The Quality Controi samples provide the following QC informadon: The Method Blank (MB) monitors the level of contamination introduced by reagents or giassware. 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 effeccs. A minimum of one MBS is nm per batch of 20 samples or less. The Matrix Spike (MS) measures the accu�acy of the method for a matrix type. Due to the high 1 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, aze run per batch of 20 samplcs or less. The sample selected for the matrix spike is designated MX, and may or may not have been submitte� by the recipient of this repoR. 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) / MS spike level] x 100 RPD ={ � MS result - MSD result � / [(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 Laborntories in generat. Please contact a Project Manager for further information. ) QCNepJ\9116