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ENVIRONMENTAL���7�_ <br /> Analytical Chemists <br /> December 19, 2025 <br /> Lab No. : STK2558607 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control - Organic <br /> Organic <br /> 1,3-Dibromopropane 504 12/11/2025:213829MNM Blank ug/L 0.5049 84.3% 70-130 <br /> LCS ug/L 0.4982 98.7% 70-130 <br /> LCS ug/L 0.5092 105% 70-130 <br /> MS ug/L 0.4969 79.9% 70-130 <br /> (SP 2500106-240) MSD ug/L 0.5059 81.9% 70-130 <br /> MSRPD ug/L 4.3% s30 <br /> DBCP 504 12/11/2025:21.3829MNM Blank ug/L ND <0.00987 <br /> LCS ug/L 0.4730 106% 70-130 <br /> LCS ug/L 0.2417 116% 70-130 <br /> MS ug/L 0.2359 91.1% 70-130 <br /> (SP 2500106-240) MSD ug/L 0.2402 97.9% 70-130 <br /> MSRPD ug/L 9.0% 530 <br /> Definition <br /> Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> DQO : Data Quality Objective-This is the criteria against which the quality control data is compared. <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 matrix <br /> affects analyte recovery. <br /> MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an <br /> 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 and <br /> analysis. <br /> ND : Non-detect-Result was below the DQO listed for the analyte. <br /> Section:Quality Control Page 4 of 4 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 9411 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 /> 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 />