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November 12, 2025 <br />Lab No. : STK2556626 <br />San Joaquin County EHD <br />Customer No. :3017919 <br />Control - Metals <br />Metals <br />Office & Laboratory <br />Office & Laboratory <br />Office & Laboratory <br />Office & Laboratory <br />853 Corporation Street <br />2500 Stagecoach Road <br />Boron <br />200.7 10/28/2025:212077AC <br />MS <br />mg/L <br />4.000 <br />83.7% <br />75-125 <br />Visalia, CA 93291 <br />(CH 2590452-001) <br />MSD <br />mg/L <br />4.000 <br />88.6% <br />75-125 <br />CA ELAP Certification No, 1563 <br />CA ELAP Certification No. 2670 <br />MSRPD <br />mg/L <br />5.2% <br />:_20.0 <br />Calcium <br />200.7 10/28/2025:212077AC <br />MS <br />mg/L <br />12.00 <br />60.5% <br /><'A 406 <br />(CH 2590452-001) <br />MSD <br />mg/L <br />12.00 <br />66.3% <br /><1/4 <br />MSRPD <br />mg/L <br />1.2% <br />:520.0 <br />Copper <br />200.7 10/28/2025:212077AC <br />MS <br />ug/L <br />800.0 <br />22.8% <br />75-125 435 <br />(CH 2590452-001) <br />MSD <br />ug/L <br />800.0 <br />26.3% <br />75-125 435 <br />MSRPD <br />ug/L <br />14.3% <br />:520.0 <br />Iron <br />200.7 10/28/2025:212077AC <br />MS <br />ug/L <br />4000 <br />7.04% <br />75-125 435 <br />(CH 2590452-001) <br />MSD <br />ug/L <br />4000 <br />6.91% <br />75-125 435 <br />MSRPD <br />ug/L <br />1.7% <br />:520.0 <br />Magnesium 200.7 10/28/2025:212077AC <br />MS <br />mg/L <br />12.00 <br />52.6% <br /><1/a 406 <br />(CH 2590452-001) <br />MSD <br />mg/L <br />12.00 <br />55.2% <br /><1/4 <br />MSRPD <br />mg/L <br />0.4% <br />520.0 <br />Manganese 200.7 10128/2025:212077AC <br />MS <br />ug/L <br />800.0 <br />85.0% <br />75-125 <br />(CH 2590452-001) <br />MSD <br />ug/L <br />800.0 <br />90.3% <br />75-125 <br />MSRPD <br />ug/L <br />6.1% <br />:520.0 <br />Potassium <br />200.7 10/28/2025:212077AC <br />MS <br />mg/L <br />12.00 <br />84.6% <br />75-125 <br />(CH 2590452-001) <br />MSD <br />mg/L <br />12.00 <br />89.4% <br />75-125 <br />MSRPD <br />mg/L <br />4.5% <br />:520.0 <br />Sodium <br />200.7 10/28/2025:212077AC <br />MS <br />mg/L <br />12.00 <br />-51.8% <br /><1/a 406 <br />(CH 2590452-001) <br />MSD <br />mg/L <br />12.00 <br />-2.83% <br /><1/4 <br />MSRPD <br />mg/L <br />2.8% <br />:520.0 <br />Zinc <br />200.7 10/28/2025:212077AC <br />MS <br />ug/L <br />800.0 <br />99.7% <br />75-125 <br />(CH 2590452-001) <br />MSD <br />ug/L <br />800.0 <br />107% <br />75-125 <br />MSRPD <br />ug/L <br />5.8% <br />:520.0 <br />Definition <br />DQO <br />: Data Quality Objective - This is the criteria against which the quality control data is compared. <br />MS <br />: 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 <br />: Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a <br />known amount of analyted. The recoveries are an <br />indication of how that sample matrix affects analyte recovery. <br />MSRPD <br />: MS/MSD Relative Percent Difference (RPD) - The MS relative <br />percent difference is an indication of precision for the preparation and <br />analysis. <br />ND <br />: Non -detect - Result was below the DQO listed for the analyte. <br />Explanation <br />406 <br />Matrix Spike (MS) not within the Acceptance Range (AR) because <br />of high analyte concentration in the sample. Data was accepted based <br />on the LCS or CCV recovery. <br />435 <br />Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br />Section: Quality Control <br />Page 6 of 8 <br />Page 6 or <br />Corporate Offices & Laboratory <br />Office & Laboratory <br />Office & Laboratory <br />Office & Laboratory <br />Office & Laboratory <br />853 Corporation Street <br />2500 Stagecoach Road <br />563 E. Undo Avenue <br />3442 Empresa Drive, Suite D <br />9411 W. Goshen Avenue <br />Santa Paula, CA 93060 <br />Stockton, CA 95215 <br />Chico, CA 95926 <br />San Luis Obispo, CA 93401 <br />Visalia, CA 93291 <br />TEL: (805)392-2000 <br />TEL: (209)942-0182 <br />TEL: (530)343-5818 <br />TEL: (805)783-2940 <br />TEL: (559)734-9473 <br />CA ELAP Certification No. 1573 <br />CA ELAP Certification No, 1563 <br />CA ELAP Certification No. 2670 <br />CA ELAP Certification No. 2775 <br />CA ELAP Certification No. 2810 <br />