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<br /> <br />ENVIRONMENTAL - /AGRICULTURAL <br /> <br />Analytical Chemists <br /> <br />April 25, 2023 <br />Knutsen Pump Testing <br /> <br />Lab No. : STK2334964 <br />Customer No. : 3018027 <br />Quality Control - Wet Chem <br />Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br />Wet Chem <br />Nitrate Nitrogen 4500NO3F 04/21/2023:204301 LFS Blank mg/L ND <0.4 <br />LCS mg/L 11.22 94.5% 80-120 <br />MS mg/L 5.609 92.2% 66-125 <br />(STK2334953-001) MSD mg/L 5.609 94.1% 66-125 <br />MSRPD mg/L 5.609 0.7% 530.4 <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 /> <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 <br />Office & Laboratory Office & Laboratory <br />3442 Empresa Drive, Suite D 9415W. Goshen Avenue <br />San Luis Obispo, CA 93401 Visalia, CA 93291 <br />TEL: (805)783-2940 TEL: (559)734-9473 <br />FAX: (805)783-2912 FAX: (559)734-8435 <br />No. 2670 CA ELAP Certification No. 2775 CA ELAP Certification No. 2810