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March 27, 2006 Lab ID : STK632280 <br /> M D Investments Customer : 3-15835 <br /> Quality Control - Organic <br /> Constituent Method Date/ID =Type=UnitsConc. QC Data DQO Note <br /> DBCP 504.1 03/23/2006:A203 Blank ug/L ND <0.01 <br /> LCS ug/L 0.2949 101% 70-130 <br /> BS ug/L 0.2949 101% 70-130 <br /> BSD ug/L 0.2949 101% 70-130 <br /> BSRPD ug/L 0.6% <30 <br /> 504.1 03/23/2006:A 00-CCV ug/L 5.000 97.4% 70-130 <br /> 01-CCV ug/L 5.000 104% 70-130 <br /> 1,3-Dibromopropane-Surrogate 504.1 03/23/2006:A203 Blank ug/L 0.5868 109% 70-130 <br /> LCS ug/L 0.5868 113% 70-130 <br /> BS ug/L 0.5868 105% 70-130 <br /> BSD ug/L 0.5868 106% 70-130 <br /> 504.1 03/23/2006:A 00-CCV ug/L 9.975 108% 70430 <br /> 01-CCV ug/L 9.975 112% 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 /> BS/BSD Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation <br /> process is not affecting analyte recovery. <br /> Dup Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent <br /> difference is an indication of precision for the preparation and analysis. <br /> ICB Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br /> ICV Initial Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br /> CCB Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <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 /> <i' High Sample Background - Spike concentration was less than one forth of the sample concentration. <br /> DQO Data Quality Objective - This is the criteria against which the quality control data is compared. <br /> STK632280: Quality Control Page 5 <br />