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ENVIRONMENTAL <br />Analytical che <br />AGRICULTURAL <br />mists <br />July 25, 2024 <br />Anna Gwerder Lab No. : STK2450534 <br />Customer No. : 3017263 <br />Quality Control - Wet Chem <br />Constituent <br /> <br />Method <br /> <br />Date/ID <br /> <br />Type <br /> <br />Units <br /> <br />Conc. <br /> <br />QC Data <br /> <br />DQO <br /> <br />Note <br /> <br />Wet Chem <br />Nitrate Nitrogen 4500NO3F 07/22/2024:2081081LP Blank <br />LCS <br />MS <br />(CH 2476390-001) 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 />ND <br />98.1% <br />99.0% <br />95.4% <br />3.6% <br /><0.4 <br />80-120 <br />66-125 <br />66-125 <br />530.4 <br />Definition <br />Blank <br />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 <br />Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recove 13". <br />MS Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how t hat 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 (FtPD) - 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 Pagc 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