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Analytical Chemists <br /> January 18, 2023 <br /> Lab No. : STK2330373 <br /> Customer No. : 3019285 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Nitrate Nitrogen 450ONO3F 01112/2023:200319LFS Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.0% 80-120 <br /> MS mg/L 5.609 96.8% 66-125 <br /> (SP 2300434-001) MSD mg/L 5.609 96.4% 66-125 <br /> MSRPD mg/L 5.609 0.4% 1530.4 <br /> Nitrite as Nitrogen 450ONO3F 01/12/2023:20032OLFS Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 108% 80-120 <br /> MS mg/L 0.6090 122% 50-150 <br /> (SP 2300434-001) MSD mg/L 0.6090 104% 50-150 <br /> MSRPD mg/L 0.6090 15.7% <30 <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 Page 4 of Page 4 of 4 <br /> Corporate Offices 8 Laboratory Office&Laboratory ORice&Laboratory Office 8 Laboratory Office 8 Laboratory <br /> 853 Corporation Street 2500 Stagecoach Road 563 E.Linda Avenue 3442 Empresa Drive,Suite 0 9415 W.Goshen Avenue <br /> Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 <br /> TEL:(605)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 <br /> Env FAX:(805)525-0172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 <br /> CA ELAP Certification No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810 <br />