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April 4 2012 Lab ID : STK1232392 <br /> San Joaquin County Solid Waste Customer : 3-2956 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br /> Organic <br /> Xylene m,p 8260B 03/23/12:204374VRG CCV ug/L 50.00 101% 70-130 <br /> X lenes o 8260B 03/23/12:204374VRG CCV u /L 1 25.00 101% 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 com aced. <br /> Explanation <br /> 360 :CCV above Acceptance Range(AR.Sam les which were non detect for this analyte were accepted. <br /> Page 14 of 14 <br />