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ENVIRONMENTAL AGRICULTURAL <br />Analytical Chemists <br />August 2, 2021 Lab ID : STK2139970 <br />San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br />Quality Control - Organic <br />Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br />Organic <br />1,3-Dibromopropane 504 07/23/21:208380JMR Blank ug/L 0.5687 89.5% 70-130 <br />LCS ug/L 0.5692 81.4% 70-130 <br />LCS ug/L 0.5713 101 % 70-130 <br />MS ug/L 0.5599 87.7 % 70-130 <br />(STK2139910-001) MSD ug/L 0.5636 99.7% 70-130 <br />MSRPD ug/L 0.5636 13.5% <30 <br />DBCP 504 07/23/21:208380JMR Blank ug/L ND <0.01 <br />LCS ug/L 0.2425 83.7 % 70-130 <br />LCS ug/L 0.2434 110% 70-130 <br />MS ug/L 0.2386 90.5 % 70-130 <br />(STK2139910-001) MSD ug/L 0.2401 97.3 % 70-130 <br />MSRPD ug/L 0.5636 7.9% <30 <br />13DBP 504.1 07/24/21:211329jmr CCV ug/1 9.975 103% 70-130 <br />CCV ug/1 7.481 130% 70-130 <br />504 I 07/24/21:211329jmr CCV ug/1 5.000 94.8% 70-130 IDBCP <br />CCV ug/1 2.000 129% 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. Lind° Avenue <br />Chico, CA 95926 <br />TEL: (530)343-5818 <br />FAX: (530)343-3807 <br />CA ELAP Certification No. <br />Office 8. Laboratory <br />3442 Empress Drive, Suite D <br />San Luis Obispo, CA 93401 <br />TEL: (805)783-2940 <br />FAX: (805)783-2912 <br />2670 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