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October 22, 2018 Lab 1131 : STK1854031 <br /> Pacific Northwest Oil Customer : 3 - 16002 <br /> Quality Control - Organic <br /> Definition <br /> CCV : Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br /> Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> LCS : Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <br /> MS : Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample <br /> matrix affects analyte recovery. <br /> MSD : Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyted. The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> MSRPD : MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation <br /> and analysis. <br /> ND : Non-detect - Result was below the DQO listed for the analyte. <br /> <'/4 : High Sample Background - Spike concentration was less than one forth of the sample concentration. <br /> DQO : Data Quality Objective - This is the criteria against which the cpaabcontrol data is compared, <br /> Explanation <br /> 325 : The LCS was out of acceptance limits, Results may be biased low. <br /> 330 : The LCS was out of acceptance limits. Results may be biased high. <br /> 435 : Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br /> Page 5 of 5 <br />