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Lab No.: STK2639882 <br />Customer No.:3017263 <br />Quality Control - Wet Chem <br />4500N03F 07/07/2026:207641MMl <br />(VI 2644813-001) <br />Nitrite as Nitrogen 4500N03F 07/07/2026:207672MMl <br />(VI 2644813-001) <br />MSD <br />MSRPD <br />ND <br />Page 4 of 4 Page 4 of 4Section: Quality Control <br />TypeConstituentMethodDate/ID Units QC Data DQO <br />Wet Chem <br />Nitrate Nitrogen <br />Blank <br />DQO <br />LCS <br />MS <br />1.218 <br />0.6090 <br />0.6090 <br />11.22 <br />5.609 <br />5.609 <br />Corporate Offices & Laboratory <br />853 Corporation Street <br />Santa Paula, CA 93060 <br />TEL: (805)392-2000 <br />CA ELAP Certification No. 1573 <br />Office & Laboratory <br />563 E. Lindo Avenue <br />Chico. CA 95926 <br />TEL: (530)343-5818 <br />CA ELAP Certification No. 2670 <br />Blank <br />LCS <br />MS <br />MSD <br />MSRPD <br />Blank <br />LCS <br />MS <br />MSD <br />MSRPD <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />Office 8. Laboratory <br />3442 Empresa Drive, Suite D <br />San Luis Obispo, CA 93401 <br />TEL: (805)783-2940 <br />CA ELAP Certification No. 2775 <br />Office & Laboratory <br />9411 W. Goshen Avenue <br />Visalia. CA 93291 <br />TEL: (559)734-9473 <br />CA ELAP Certification No. 2810 <br /><0.4 <br />80-120 <br />66-125 <br />66-125 <br /><30.4 <br /><0.2 <br />80-120 <br />50-150 <br />50-150 <br /><30 <br />July 21, 2026 <br />Anna Gwerder <br />Office & Laboratory <br />2500 Stagecoach Road <br />Stockton, CA 95215 <br />TEL (209)942-0182 <br />CA ELAP Certification No. 1563 <br />ND <br />96.2% <br />94.3% <br />94.7% <br />0.3% <br />ND <br />102% <br />90.3% <br />90.3% <br />0.0% <br />ENVIRONMENTAL AGRICULTURAL <br />Analytical Chemists <br />Definition <br />: Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />: Data Quality Objective - This is the criteria against which the quality control data is compared. <br />: Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <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 />: 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 />: MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation and <br />analysis. <br />: Non-detect - Result was below the DQO listed for the analyte. <br />Cone.Note