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,ENVIRONMENTAI:'ki AGRICULTUMI, <br />T r Anaiytkal Chemists <br />March 29, 2023 <br />Lab No. : STK2333458 <br />Customer No. :3019316 <br />Quality Control - Wet Chem <br /> <br />Method <br /> <br />Date/ID <br /> <br />Units <br /> <br />Conc. QC Data <br /> <br />Note Constituént <br /> <br />DQO <br /> <br />Wet Chem <br />Nitrate Nitrogen 4500NO3F 03/17/2023:202907LFS Blank <br />LCS <br />MS <br />(VI 2341592-001) MSD <br />MSRPD <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />11.22 <br />5.609 <br />5.609 <br />5.609 <br />ND <br />93.1% <br />64.3% <br />72.5% <br />1.6% <br /><0.4 <br />80-120 <br /><A1/4 <br />66-125 <br />s30.4 <br />Definition s' • <br />Blank " ; Method Blank - Prepared to verify that the preparation process is not contributing'contimination to the samples. <br />DQO : Data Quality Objective -This is the criteria against which the quality control data is compared. <br />LCS : Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <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 <br /> Page 4 of 4 <br />Page 4 of 4 <br />Corporate Offices & Laboratory Office & Laboratory <br />853 Corporation Street <br />2500 Stagecoach Road <br />Santa Paula, CA 93060 Stockton, CA 95215 <br />TEL: (805)392-2000 TEL: (209)942-0182 <br />Env FAX: (805)525-4172 / Ag FAX: (805)392-2063 FAX: (209)942-0423 <br />CA El AP Certification No 1573 CA FLAP Certification No <br />Office & Laboratory Office & Laboratory <br />563 E. Linde Avenue 3442 Empresa Drive, Suite D <br />Chico, CA 95926 San Luis Obispo, CA 93401 <br />TEL: (530)343-5818 TEL: (805)783-2940 <br />FAX: (530)343-3807 FAX: (805)783-2912 <br />1563 CA Fl AP Certification No 267n CA Fl AP C.ertificatinn No 7775 <br />Office & Laboratory <br />9415W. Goshen Avenue <br />Visalia, CA 93291 <br />TEL: (559)734-9473 <br />FAX: (559)7:34-8435 <br />CA Fl AP Certification No 7n1