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-= - ENVIRONMENTAL Decemb H2 'Y2%AL CHEMISTS Lab ID STK539766 Precision Enviro-Tech Customer : 3-13102 Quality Control - Organic Constituent Method Date/ID Type Units Conc. QC Data DQO Note DBCP 504.1 12/20/2005:A203 Blank ug/L ND <0.01 LCS ug/L 0.2949 97.9% 70-130 MS ug/L 0.2949 104% 70-130 (SP 512987-01) MSD ug/L 0.2949 96.1% 70-130 MSRPD ug/L 8.2% <_30 504.1 12/20/2005:A 01-CCV ug/L 5.000 102% 70-130 02-CCV ug/L 10.00 105% 70-130 1,3-Dibromopropane-Surrogate 504.1 12/20/2005:A203 Blank ug/L 0.5868 85.6% 70-130 LCS ug/L 0.5868 81.8% 70-130 MS ug/L 0.5868 88.5% 70-130 (SP 512987-01) MSD ug/L 0.5868 77.6% 70-130 504.1 12/20/2005:A 01-CCV ug/L 9.975 87.6% 70-130 02-CCV ug/L 9.975 82.1% 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 o how that sample matrix affects analyte recovery. 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. STK539766: Quality Control Page 1 Corporate Offices&Laboratory Office&Laboratory Field Office P.O.Box 272/853 Corporation Street 2500 Stagecoach Road Visalia,California Santa Paula,CA 93061-0272 Stockton,CA 95215 TEL: (559)734-9473 TEL: (805)392-2000 TEL: (209)942-0182 FAX: (559)734-8435 FAX: (805)525-4172 FAX: (209)942-0423 Mobile: (559)737-2399 CA NELAP Certification No.0111 OCA CA ELAP Certification No.1563 CA ELAP Certification No.1573