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.O `AGRICULTURAL Analytical Chemists February 14, 2023 Lab No. : STK2331515 San Joaquin County EHD Customer No. : 3017919 Quality Control - Metals Metals Boron 200.7 02/09/2023:201452AC MS mg/L 4.000 92.9% 75-125 (SP 2301762-001) MSD mg/L 4.000 97.0% 75-125 MSRPD mg/L 800.0 4.0% :_20.0 Calcium 200.7 02/09/2023:201452AC MS mg/L 12.00 154% <'A (SP 2301762-001) MSD mg/L 12.00 -606% <'A MSRPD mg/L 800.0 26.9% :_20.0 435 Copper 200.7 02/09/2023:201452AC MS ug/L 800.0 88.0% 75-125 (SP 2301762-001) MSD ug/L 800.0 86.2% 75-125 MSRPD ug/L 800.0 2.1% :520.0 Iron 200.7 02/09/2023:201452AC MS ug/L 4000 83.2% 75-125 (SP 2301762-001) MSD ug/L 4000 73.4% 75-125 435 MSRPD ug/L 800.0 12.4% :520.0 Magnesium 200.7 02/09/2023:201452AC MS mg/L 12.00 36.6% <1/4 (SP 2301762-001) MSD mg/L 12.00 -4.1% <1/4 MSRPD mg/L 800.0 5.2% :520.0 Manganese 200.7 02/09/2023:201452AC MS ug/L 800.0 89.8% 75-125 (SP 2301762-001) MSD ug/L 800.0 77.5% 75-125 MSRPD ug/L 800.0 11.9% :520.0 Potassium 200.7 02/09/2023:201452AC MS mg/L 12.00 87.0% 75-125 (SP 2301762-001) MSD mg/L 12.00 72.4% 75-125 435 MSRPD mg/L 800.0 8.8% :520.0 Sodium 200.7 02/09/2023:201452AC MS mg/L 12.00 34.7% <1/4 (SP 2301762-001) MSD mg/L 12.00 -0.6% <1/4 MSRPD mg/L 800.0 5.0% :520.0 Zinc 200.7 02/09/2023:201452AC MS ug/L 800.0 83.4% 75-125 (SP 2301762-001) MSD ug/L 800.0 54.2% 75-125 435 MSRPD ug/L 800.0 42.2% :_20.0 435 Definition <'A : High Sample Background-Spike concentration was less than one forth of the sample concentration. 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 435 : Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Section:Quality Control Page 5 of 7 Page 5 of 7 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo Avenue 3442 Empresa Drive,Suite D 9415 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 Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 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