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=e <br /> ENVIRONMENTALIW <br /> Analytical Chemists <br /> July 21, 2026 <br /> Lab No. : STK2639982 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control - Metals <br /> Metals <br /> Boron 200.7 07/09/2026:207759AC MS mg/L 4.000 81.8% 75-125 <br /> (VI2644883-004) MSD mg/L 4.000 84.5% 75-125 <br /> MSRPD mg/L 3.2% :520.0 <br /> Calcium 200.7 07/09/2026:207759AC MS mg/L 12.00 75.5% 75-125 <br /> (VI2644883-004) MSD mg/L 12.00 78.7% 75-125 <br /> MSRPD mg/L 0.7% :520.0 <br /> Copper 200.7 07/09/2026:207759AC MS ug/L 800.0 82.7% 75-125 <br /> (VI2644883-004) MSD ug/L 800.0 85.0% 75-125 <br /> MSRPD ug/L 2.8% s20.0 <br /> Iron 200.7 07/09/2026:207759AC MS ug/L 4000 81.6% 75-125 <br /> (VI2644883-004) MSD ug/L 4000 83.6% 75-125 <br /> MSRPD ug/L 2.5% :520.0 <br /> Magnesium 200.7 07/09/2026:207759AC MS mg/L 12.00 78.8% 75-125 <br /> (VI2644883-004) MSD mg/L 12.00 83.0% 75-125 <br /> MSRPD mg/L 1.9% :520.0 <br /> Manganese 200.7 07/09/2026:207759AC MS ug/L 800.0 80.9% 75-125 <br /> (VI2644883-004) MSD ug/L 800.0 83.8% 75-125 <br /> MSRPD ug/L 3.5% :520.0 <br /> Potassium 200.7 07/09/2026:207759AC MS mg/L 12.00 79.5% 75-125 <br /> (VI2644883-004) MSD mg/L 12.00 83.0% 75-125 <br /> MSRPD mg/L 3.7% 520.0 <br /> Sodium 200.7 07/09/2026:207759AC MS mg/L 12.00 70.4% <1/4 406 <br /> (VI2644883-004) MSD mg/L 12.00 69.6% <1/4 <br /> MSRPD mg/L 0.1% :520.0 <br /> Zinc 200.7 07/09/2026:207759AC MS ug/L 800.0 95.1% 75-125 <br /> (VI2644883-004) MSD ug/L 800.0 90.1% 75-125 <br /> MSRPD ug/L 5.4% :520.0 <br /> Definition <br /> DQO : Data Quality Objective-This is the criteria against which the quality control data is compared. <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 /> Explanation <br /> 406 Matrix Spike(MS)not within the Acceptance Range(AR)because of high analyte concentration in the sample.Data was accepted based <br /> on the LCS or CCV recovery. <br /> Section:Quality Control Page 6 of 8 Page 6 of 8 <br /> Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory <br /> 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo 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 />