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ENVIRONMENTAL Analytical Chcmiqts July 11, 2025 Lab No. : S FK2539765 Anna Gwerder Customer No. : 3017263 Quality Control ••Wet Chem Wet Chem Nitrate Nitrogen 4500NO3F 07108/2025:207411MM1 Blank mglL ND <0.4 LCS mglL 11,22 97.7% 80-120 MS mglL 5,609 95.4% 66-125 (SP 2511364-012) MSD mglL 5.609 95.7% 66-125 MSRPD mglL 0.2% 530.4 Definition Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. DQO : Data Quality Objective-This is the criteria against which the quality control data is compared. LCS : Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS : Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD : MSIMSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND :Nan-detect-Result was below the DQO listed for the analyte. Section:Quality Control Page 4 of 4 Page 4 of 4 Corporate Offioes&Laboratory Office&Laboratory Office,&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo Avenue 3442 Empresa Drive,Suite D 9411 W.Goshen Avenue Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 TEL:(805)392-2000 TEL:(209)942-a182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 CA ELAP Certification No.1573 CA ELAP Certification No,1563 CA ELAP Certification No.2670 CA FLAP Certification No.2775 CA ELAP Certification No.2810