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6-11-2003 12:37PM F CITY OF STOCKTON 2099377414 <br />April 25, 2003 <br />City of Stockton Municipal Service Ctr <br />Quality Control - Organic <br />Lab ID : STK331616 <br />Customer: 3-11467 <br />Constituent <br />Method Date/ID Type Units Cont:. QC Data DQO Note <br />Vinyl Acetate <br />8260B 04/04/2003:A 01-CCV ug/L 200,0 68.5% 50-M <br />Vinyl Cbloride <br />503013 03/28/2003;A233 Blank ug/kg ND C5 <br />8260B 04104/2005A 00-CCV ug/L 50.00 9418% 80-120 <br />Xylenes m,p <br />503013 03/28/2003:A233 Blank ug/kg ND C5 <br />8260B 04/04/2003:A 00-CCV ug/L 100.0 115% 70-130 <br />Bxphtrwtions <br />360 CCV above Acceptance Range (AR). Samples which were non detect for this analyte were accepted. <br />435 Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br />560 Surrogate percent recoveries not within the Acceptance Range (AR) due to suspected matrix interferences. <br />DefSttitions <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 e <br />how that sample matrix affects analyte recovery. <br />CCV Continuing Calibration Verification - Analyzed to ' verify the instrument calibration is within criteria. <br />AID 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 />S£K331616: Quality Control Page 7 <br />