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FGL <br /> ENVIRONMENTAL <br /> Analytical Chemists <br /> February 7, 2025 <br /> Leiana Villa .Lab No. : S'T'K2531392 <br /> Customer No. : 3019566 <br /> Quality Control - Wet Chem <br /> Wet Chem <br /> Nitrate Nitrogen 4500NO3F 02/01/2025:20119OAKB Blank mg/L ND a0.4 <br /> LCS mg/L. 11.22 102% 80-120 <br /> MS mg/L 5.609 104% 66-125 <br /> (CH 2570869-001) MSD mg/L 5.609 104% 66-125 <br /> MSRPD mg/L 0.0% 530.4 <br /> Nitrite as Nitrogen 450ONO2F 02/01/2025:201204AKB Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 100°/a 80-120 <br /> MS mg/L 0.6090 97.5% 50-150 <br /> (CH 2570869-001) MSD mg/L 0..6090 98.0% 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 indicaticn of precision for the preparation and <br /> ana_ysis. <br /> ND : Non-detect-Result was below the DQO listed for the analyte. <br /> Section: Quality Control Page 4 of 4 Page 4 o1 4 <br /> Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory <br /> 853 Corporation street 2500 Stagecoach Road 563 E.Linda Avenue 3442 Empress Drive,Suite D 9411 W.Goshen Avenue <br /> Santa Paula,CA 93060 Stockton,CA 95216 Chico,CA 95926 San Luis Obispo,CA 93401 Misalia,CA 93291 <br /> TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 <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 />