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ENVIRONMENTAL" AGRICULTUFAL Analytical Chemists January 23, 2026 San Joaquin County EHD Lab No. : STK2630487 Customer No. : 3017919 Quality Control- Metals Metals Boron 200.7 01/14/2026:200411AC MS mg/L 4.000 96.1% 75-125 (STK2630491-002) MSD mg/L 4.000 98.3% 75-125 MSRPD mg/L 2.1% :520.0 Calcium 200.7 01/14/2026:200411AC MS mg/L 12.00 81.3% 75-125 (STK2630491-002) MSD mg/L 12.00 70.4% 75-125 435 MSRPD mg/L 3.1% :520.0 Copper 200.7 01/14/2026:200411AC MS ug/L 800.0 93.5% 75-125 (STK2630491-002) MSD ug/L 800.0 96.6% 75-125 MSRPD ug/L 3.2% <_20.0 Iron 200.7 01/14/2026:200411AC MS ug/L 4000 92.8% 75-125 (STK2630491-002) MSD ug/L 4000 92.5% 75-125 MSRPD ug/L 0.3% :520.0 Magnesium 200.7 01/14/2026:200411AC MS mg/L 12.00 87.9% 75-125 (STK2630491-002) MSD mg/L 12.00 81.5% 75-125 MSRPD mg/L 2.8% <_20.0 Manganese 200.7 01/14/2026:200411AC MS ug/L 800.0 95.8% 75-125 (STK2630491-002) MSD ug/L 800.0 94.5% 75-125 MSRPD ug/L 1.1% :520.0 Potassium 200.7 01/14/2026:200411AC MS mg/L 12.00 92.3% 75-125 (STK2630491-002) MSD mg/L 12.00 90.9% 75-125 MSRPD mg/L 1.0% <_20.0 Sodium 200.7 01/14/2026:200411AC MS mg/L 12.00 63.2% <1/q 406 (STK2630491-002) MSD mg/L 12.00 48.3% <1/4 MSRPD mg/L 2.5% 1520.0 Zinc 200.7 01/14/2026:200411AC MS ug/L 800.0 89.3% 75-125 (STK2630491-002) MSD ug/L 800.0 89.0% 75-125 MSRPD ug/L 0.3% <_20.0 Definition DQO : Data Quality Objective-This is the criteria against which the quality control data is compared. MS : Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD : MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND : Non-detect-Result was below the DQO listed for the analyte. Explanation 406 Matrix Spike(MS)not within the Acceptance Range(AR)because of high analyte concentration in the sample.Data was accepted based on the LCS or CCV recovery. 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Section:Quality Control Page 6 of 8 Page 6 of 8 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Undo Avenue 3442 Empresa Drive,Suite D 9411 W.Goshen Avenue Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 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