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December 17, 2012 Lab ID STK1251067 <br /> San Joaquin County PWD-Solid Waste Div. Customer : 3-2956 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Organic <br /> Xylenes o 8260B 12/06112:2I8189VRG CCV RyIL 25.00 94.890 70-130 <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 /> 310 :LCS above Acceptance Range(AR).Samples which were non detect for this analyte were accepted. <br /> 325 :LCS not within Acceptance Range(AR).Data could not be confirmed by reanalysis.Use results with discretion. <br /> 360 :CCV above Acceptance Range(AR).Samples which were non detect for this analyte were accepted. <br /> 435 :Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recove . <br /> ® Page 21 of 21 <br />