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<br /> <br />FGL <br />ENVIRONMENTAL AGRICULTURAL <br /> <br />Analytical Chemists <br /> <br />June 27, 2023 <br />Patrick Sunbury <br /> <br />Lab No. : STK2338185 <br />Customer No. : 3018387 <br />Quality Control - Wet Chem <br />Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br />Wet Chem <br />Nitrate Nitrogen 4500NO3F 06/22/2023:206873LFS Blank mg/L ND <0.4 <br />LCS mg/L 11.22 99.0% 80-120 <br />MS mg/L 5.609 97.9% 66-125 <br />(STK2338185-001) MSD mg/L 5.609 99.0% 66-125 <br />MSRPD mg/L 0.8% s30.4 <br />Nitrite as Nitrogen 4500NO3F 06/22/2023:206874LFS Blank mg/L ND <0.2 <br />LCS mg/L 1.218 102% 80-120 <br />MS mg/L 0.6090 103% 50-150 <br />(STK2338185-001) MSD mg/L 0.6090 103% 50-150 <br />MSRPD mg/L 0.5% 530 <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 <br />Page 4 of 4 <br />Corporate Offices & Laboratory <br />853 Corporation Street <br />Santa Paula, CA 93060 <br />TEL: (805)392-2000 <br />Env FAX: (805)525-4172 / Ag FAX: <br />CA ELAP Certification No. 1573 <br />Office & Laboratory <br />2500 Stagecoach Road <br />Stockton, CA 95215 <br />TEL: (209)942-0182 <br />(805)392-2063 FAX: (209)942-0423 <br />CA ELAP Certification No. 1563 <br />Office & Laboratory <br />563 E. Lindo Avenue <br />Chico, CA 95926 <br />TEL: (530)343-5818 <br />FAX: (530)343-3807 <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 />FAX: (805)783-2912 <br />CA ELAP Certification No. 2775 <br />Office & Laboratory <br />9415W. Goshen Avenue <br />Visalia, CA 93291 <br />TEL: (559)734-9473 <br />FAX: (559)734-8435 <br />CA ELAP Certification No. 2810