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October 12, 2005 Lab ID : STK537077 <br /> San Joaquin County Solid Waste Customer : 3-2956 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Toluene 8260B 09/15/2005:A 00-CCV ug/L 50.00 96.1% 80-120 <br /> Toluene-d8-Surrogate 5030B 09/15/2005:S233 Blank ug/kg 25.00 100% 75-123 <br /> LCS ug/kg 25.00 98.5% 75-123 <br /> MS ug/kg 125.0 94.9% 75-123 <br /> (STK537077-01) MSD ug/kg 125.0 96.8% 75-123 <br /> 8260B 09/15/2005:A 01-CCV ug/L 25.00 101% 70-130 <br /> Xylenes m,p 5030B 09/15/2005:5233 Blank ug/kg ND <5 <br /> 8260B 09/15/2005:A 00-CCV ug/L 100.0 88.0% 70-130 <br /> Definitions <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 <br /> recovery. <br /> MS/MSD Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication o <br /> how that sample matrix affects analyte recovery. <br /> CCV Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <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 /> f <br /> STK537077: Quality Control Page 2 <br />