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Ieptember 2, 2022 <br />Lab No. : STK2252086 <br />Ave Oak Geo Environmental <br />Wet Chem <br />Nitrate Nitrogen <br />Customer No. : 3016608 <br />IIIIIND=rV Control <br />Date/ID I Type Units Conc. QC Data DQO Note <br />450ONO3F 08/25/2022:209697LFS Blank <br />mg/L <br />Office & Laboratory <br />ND <br /><0.2 <br />LCS <br />mg/L <br />11.22 <br />94.8% <br />80-120 <br />MS <br />mg/L <br />5.609 <br />96.9% <br />66-125 <br />(VI 2246599-001) MSD <br />mg/L <br />5.609 <br />94.0% <br />66-125 <br />MSRPD <br />mg/L <br />5.609 <br />0.8% <br /><_30.4 <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 3 of 3 <br />Page 3 of 3 <br />Corporate Offices & Laboratory Office & Laboratory Office & Laboratory <br />3442 Empresa Drive, Suite D 9415 W 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 />CA ELAP Certification No. 2775 CA ELAP Certification No. 2810 <br />Office & Laboratory <br />Office & Laboratory <br />853 Corporation Street <br />2500 Stagecoach Road <br />563 E. LindoAvenue <br />Santa Paula, CA 93060 <br />Stockton, CA 95215 <br />Chico, CA 95926 <br />TEL: (805)392-2000 <br />TEL: (209)942-0182 <br />TEL: (530)343-5818 <br />Env FAX: (805)525-4172 /Ag FAX: (805)392-2063 FAX: (209)942-0423 <br />FAX: (530)343-3807 <br />CA ELAP Certification No. 1573 <br />CA ELAP Certification No. 1563 <br />CA ELAP Certification No. 2670 <br />