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ENVIRONMENTAIWI-n-� AGRICULTURAL Analytical Chemists September 11,2013 Lab ID : STK1338534 California Water Service Customer : 3-9045 Quality Control-Inorganic onstituent Method Date/[D Type Units Cone. QC Data DQO Note Wet Chem MBAs 5540C 08/26/13:212493AMM CCB mg/L 0.000 0.1 CCV m 10.00 100% 99-101 MBAS Screen 5540C MS mg/L 10.10 100% 90-110 (CH 1375723-001) MSD mg/L 10.10 100% 90-110 MSRPD m 10.10 0.0 <_0.1 Definition CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria CCH :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria MS :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. MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. D90 :Data Quality Objective-This is the criteria against which the quality control data is compared. �4�I IQ.IQI�'i Page 9 of 16 Corporate Ottic.&Laboratory Omoe&Laboratory Offiee&Laboratory Office&Laboratory Otfiee&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Linda Avenue 3442 Empresa Odve,Suite D 9415 W.Goshen Avenue Santa Paula,CA 93060 Stockton,CA 95215 Chi.,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 TEL:(805)392-2000 TEL:(209)942-0182 TEL:1530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 Env FAX:(805)525-41721 Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)3433807 FAX:(805)783-2912 FAX:(559)7348435 CA NELAP Certification No.ON10CA CA ELAP Certification No.1563 CA ELAP Certi9.tion No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810