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August 23, 2012 Lab ID : STK1237620 <br /> Little Potato Slough Customer : 3-3641 <br /> Quality Control-Organic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Organic <br /> TPH-Diesel 8015M 08/21/12:209292VRG I MSRPD I m 50.00 5.1% <_18 <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 /> DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Explanation <br /> 360 :CCV above Acceptance Range(AR).Samples which were non detect for this analyte were accepted. <br /> 362 : Surrogates are qualified on Control Chart Limits,these are CCV limits.See individual sample reports. <br /> 435 :Sam !e matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 6 of 6 <br />