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ENVIRONMENTALWAGRICULTURAL <br /> Analytical Chemists <br /> May 3, 2021 Lab ID : STK2135172 <br /> San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br /> Quality Control - Organic <br /> Constituent Method Date/11) Type knits Conc. QC Data DQO Note <br /> Organic <br /> 1,3-Dibromopropane 504 04/23/21:204420JMR Blank ug/L 0.5720 104% 70-130 <br /> LCS ug/L 0.5661 99.8% 70-130 <br /> LES ug/L 0.5661 102% 70-130 <br /> MS ug/L 0.5571 98.8% 70-130 <br /> (STK213496 1-00 1) MSD ug/L 0.5663 92.7% 70-130 <br /> MSRPD u 0.2421 4.7% <30 <br /> Dl3cp 504 04/23/21:204420JMR Blank ug/L ND <0.01 <br /> LCS ug/L 0.2412 114% 70-130 <br /> LCS ug/L 0.2412 113% 70-130 <br /> MS ug/L 0.2374 117% 70-130 <br /> (STK2134961-001) MSD ug/L 0.2413 112% 70-130 <br /> MSRPD u 0.2421 2.9% <30 <br /> 13DBP 504.1 04/24/21:205940JMR CCV ug/L 7.481 101% 70-130 <br /> CCV ugIL 9.975 104% 70-130 <br /> DBCP 504.1 04/24/21:206040JMR I CCV ug/L. 2.000 —114% 70-130 <br /> CCV Ig/L_ 5.000 98.0% 70-130 <br /> Definition <br /> CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. <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 recovery. <br /> MS Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample <br /> matrix affects analyte recovery. <br /> MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation <br /> and analysis. <br /> ND :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 /> Page 4 of 4 <br /> Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory <br /> 853 Corporation Street 2500 Stagecoach Road 563 E.Undo Avenue 3442 Empresa Drive,Suite D 9415 W.Goshen Avenue <br /> Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 <br /> TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 <br /> Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 <br /> CA ELAP Certification No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810 <br />