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May 20, 2003 Lab ID STK331687 <br /> Lodi Grading & Paving, Inc. Customer : 3-14883 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Turbidity 2130B 04/01/2003:6 00-CCB NTU ND <0.2 <br /> 00-CCV NTU 2.000 99.0% 90-110 <br /> 01-CCB NTU ND <0.2 <br /> Wet Chem <br /> 01-CCV NTU 2.000 98.5% 90-110 <br /> Dermitions <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 /> 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 /> <'b High Sample Background - Spike concentration was less than one forth of the sample concentration. <br /> DQO Dara Quality Objective - This is the criteria against which the quality control data is compared. <br /> STK331687: Quality Control Page 4 <br />