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ENVIRONMENTAL AGRICULTURAL <br />Analytical Chemists <br />February 3, 2025 <br />Michele Jacobs Lab No. <br />Customer No. <br />: STK2531068 <br />: 3019285 <br />Quality Control - Wet Chem <br /> <br />Method <br /> <br />Date/ID <br /> <br />Type <br /> <br />Units Conc. QC Data <br /> <br />DQO <br /> <br />Note Constituent <br /> <br />Wet Chem <br />Nitrate Nitrogen <br />Nitrite as Nitrogen <br />4500NO3F 01/23/2025:200816MM1 Blank mg/L <br />LCS mg/L <br />MS mg/L <br />(SP 2501041-001) MSD mg/L <br />MSRPD mg/L <br />4500NO3F 01/23/2025:200841MM1 Blank mg/L <br />LCS mg/L <br />MS mg/L <br />(SP 2501041-001) MSD mg/L <br />MSRPD mg/L <br />ND <0.4 <br />11.22 93.7% 80-120 <br />5.609 92.9% 66-125 <br />5.609 90.9% 66-125 <br />1.0% s 30.4 <br />ND <0.2 <br />1.218 102% 80-120 <br />0.6090 104% 50-150 <br />0.6090 105% 50-150 <br />0.2% s30 <br />Definition <br />Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination 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 Page 4 of 4 <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 />2500 Stagecoach Road <br />Stockton, CA 95215 <br />TEL: (209)942-0182 <br />CA ELAP Certification No. 1563 <br />Office & Laboratory <br />563 E. Lindo Avenue <br />Chico, CA 95926 <br />TEL: (530)343-5818 <br />CA ELAP Certification No. 2670 <br />Office & 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