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ENVIRONMENTAL' — AGRICULTURAL <br />Analytical Chemists <br />May 27, 2021 <br /> <br />Lab ID : STK2136693 <br />San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br />Quality Control - Organic <br />Constituent Method Date/1D Type Units Cone. QC Data DQO Note <br />Organic <br />1,3-Dibromopropane 504 05/17/21:205456JMR Blank ug/L 0.5482 104% 70-130 <br />LCS ug/L 0.5847 105% 70-130 <br />LCS ug/L 0.5791 90.6% 70-130 <br />MS ug/L 0.5639 107% 70-130 <br />(STK2136693-001) MSD ug/L 0.5713 89.5 % 70-130 <br />MSRPD ug/L 0.5713 16.6% <30 <br />QMDL ug/L 0.5720 92.9% 70-130 <br />DBCP 504 05/17/21:2054561MR Blank ug/L ND <0.01 <br />LCS ug/L 0.2491 100% 70-130 <br />LCS ug/L 0.2467 90.1 % 70-130 <br />MS ug/L 0.2403 111 % 70-130 <br />(STK2136693-001) MSD ug/L 0.2434 89.0% 70-130 <br />MSRPD ug/L 0.5713 21.0% <30 <br />QMDL ug/L 0.01935 121 % 60-140 <br />13DBP 504.1 05/18/21:207312JMR CCV ug/L 7.481 80.3% 70-130 <br />CCV ug/L 9.975 106 % 70-130 <br />DBCP 504.1 05/18/2 1:207312JMR CCV ug/L 2.000 70.0% 70-130 <br />CCV ug/L 5.000 93.8% 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 <br />853 Corporation Street <br />Santa Paula, CA 93060 <br />TEL: (805)392-2000 <br />Env FAX: (805)525-4172 / Ag FAX: <br />CA ELAP Certification No. 1573 <br />Office & Laboratory <br />2500 Stagecoach Road <br />Stockton, CA 95215 <br />TEL: (209)942-0182 <br />(805)392-2063 FAX: (209)942-0423 <br />CA ELAP Certification No. 1563 <br />Office & Laboratory <br />563 E. Lindo Avenue <br />Chico, CA 95926 <br />TEL: (530)343-5818 <br />FAX: (530)343-3807 <br />CA ELAP Certification No. 2670 <br />Office & Laboratory <br />3442 Empresa Drive, Suite D <br />San Luis Obispo, CA 93401 <br />TEL: (805)783-2940 <br />FAX: (805)783-2912 <br />CA ELAP Certification No. 2775 <br />Office & Laboratory <br />9415W. Goshen Avenue <br />Visalia, CA 93291 <br />TEL: (559)734-9473 <br />FAX: (559)734-8435 <br />CA ELAP Certification No. 2810