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ENVIRONMENTAL <br /> Analytical Chemists <br /> October 30, 2025 <br /> San Joaquin County EHD Lab No. : STK2556097 <br /> Customer No. : 3017919 <br /> Quality Control- Metals <br /> Metals <br /> Boron 200.7 10/17/2025:211615AC MS mg/L 4.000 95.9% 75-125 <br /> (VI 2547395-003) MSD mg/L 4.000 93.6% 75-125 <br /> MSRPD mg/L 2.3% :_20.0 <br /> Calcium 200.7 10/17/2025:211615AC MS mg/L 12.00 91.8% 75-125 <br /> (VI 2547395-003) MSD mg/L 12.00 82.1% 75-125 <br /> MSRPD mg/L 2.7% :520.0 <br /> Copper 200.7 10/17/2025:211615AC MS ug/L 800.0 93.4% 75-125 <br /> (VI 2547395-003) MSD ug/L 800.0 94.1% 75-125 <br /> MSRPD ug/L 0.7% :520.0 <br /> Iron 200.7 10/17/2025:211615AC MS ug/L 4000 101% 75-125 <br /> (VI 2547395-003) MSD ug/L 4000 98.8% 75-125 <br /> MSRPD ug/L 2.2% :520.0 <br /> Magnesium 200.7 10/17/2025:211615AC MS mg/L 12.00 93.3% 75-125 <br /> (VI 2547395-003) MSD mg/L 12.00 92.1% 75-125 <br /> MSRPD mg/L 0.7% :520.0 <br /> Manganese 200.7 10/17/2025:211615AC MS ug/L 800.0 98.5% 75-125 <br /> (VI 2547395-003) MSD ug/L 800.0 97.3% 75-125 <br /> MSRPD ug/L 1.2% :520.0 <br /> Potassium 200.7 10/17/2025:211615AC MS mg/L 12.00 94.7% 75-125 <br /> (VI 2547395-003) MSD mg/L 12.00 92.6% 75-125 <br /> MSRPD mg/L 1.4% :520.0 <br /> Sodium 200.7 10/17/2025:211615AC MS mg/L 12.00 81.5% 75-125 <br /> (VI 2547395-003) MSD mg/L 12.00 57.4% <1/4 <br /> MSRPD mg/L 3.6% :520.0 <br /> Zinc 200.7 10/17/2025:211615AC MS ug/L 800.0 95.7% 75-125 <br /> (VI 2547395-003) MSD ug/L 800.0 98.4% 75-125 <br /> MSRPD ug/L 2.8% :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 /> 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 />