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June 10, 2005 Lab ID : STK533422 Craig Watts Customer : 3-14135 Quality Control - Organic Constituent Method Date/ID Type Units Cone. QC Data DQO Note DBCP 504.1 05/18/2005:A203 Blank ug/L ND <0.01 LCS ug/L 0.2949 96.9% 70-130 MS ug/L 0.2949 101% 70-130 (SP 504573-01) MSD ug/L 0.2949 99.5% 70-130 MSRPD ug/L 1.4% 530 504.1 05/20/2005:B 01-CCV ug/L 5.012 97.4% 70-130 02-CCV ug/L 10.02 111% 70-130 1.3-1)ibromopropane-Surrogate 504.1 05/18/2005:A203 Blank ug/L 0.5868 106% 70-130 LCS ug/L 0.5868 92.2% 70-130 MS ug/L 0.5868 96.6% 70-130 (SP 504573-01) MSD ug/L 0.5868 101% 70-130 504.1 05/20/2005:B 01-CCV ug/L 9.975 93.7% 70-130 02-CCV ug/L 9.975 107% 70-130 EDB 504.1 05/18/2005:A203 Blank ug/L ND <0.02 LCS ug/L 0.2949 100% 70-130 MS ug/L 0.2949 104% 70-130 (SP 504573-01) MSD ug/L 0.2949 99.1% 70-130 MSRPD ug/L 4.9% 530 504.1 05/20/2005:B 01-CCV ug/L 5.012 99.2% 70-130 02-CCV ug/L 10.02 107% 70-130 Definitions Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. LCS : Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS/MSD : Matrix Spikes-A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample matrix affects analyte recovery. ICB :Initial Calibration Blank-Analyzed to verify the instrument baseline is within criteria. ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. CCH :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. ND : Non-detect-Result was below the DQO listed for the analyte. DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. STK533422: Quality Control Page 2