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April 6, 2023 <br />Julie Edsell Lab No. : STK2333692 <br />Customer No. :3018723 <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 4 Page 4 of 4 <br />Corporate Offices & Laboratory <br />Quality Control - Wet Chem <br />Office 8 Laboratory <br />Office & Laboratory <br />Office a Laboratory <br />853 Corporation Street <br />2500 Stagecoach Road <br />563 E Linda Avenue <br />3442 Empresa Drive, Suite D <br />9415 W. Goshen Avenue <br />Wet Chem <br />Stockton, CA 95215 <br />Chico, CA 95926 <br />San Luis Obispo, CA 93401 <br />Visalia, CA 93291 <br />Nitrate Nitrogen 450ONO3F 04104/2023:203571LFS Blank mg/L <br />TEL: (209)942-0182 <br />ND <br /><0.4 <br />TEL: (559)734-9473 <br />LCS mg/L <br />11.22 <br />96.8% <br />80-120 <br />CA FLAP Certification No. 1573 <br />MS mg/L <br />5.609 <br />94.5% <br />66-125 <br />(SP 2304751-001) MSD mg/L <br />5.609 <br />97.6% <br />66-125 <br />MSRPD mg/L <br />5.609 <br />3.1% <br />530.4 <br />Definition <br />Blank : <br />Method Blank- Prepared to verify that the preparation process is not contributing contamination <br />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 4 Page 4 of 4 <br />Corporate Offices & Laboratory <br />Office 8 Laboratory <br />Office 8 Laboratory <br />Office & Laboratory <br />Office a Laboratory <br />853 Corporation Street <br />2500 Stagecoach Road <br />563 E Linda Avenue <br />3442 Empresa Drive, Suite D <br />9415 W. Goshen Avenue <br />Santa Paula, CA 93060 <br />Stockton, CA 95215 <br />Chico, CA 95926 <br />San Luis Obispo, CA 93401 <br />Visalia, CA 93291 <br />TEL (805)392-2000 <br />TEL: (209)942-0182 <br />TEL: (530)343-5818 <br />TEL: (805)783-2940 <br />TEL: (559)734-9473 <br />F.nv FAX. (805)525-4172/Ag FAX: (805)392-2063 FAX: (209)942-0423 <br />FAX: (530)343-3807 <br />FAX: (805)783-2912 <br />FAX (559)734-8435 <br />CA FLAP Certification No. 1573 <br />CA FLAP Certification No. 1563 <br />CA ELAP Certification No. 2670 <br />CA ELAP Certificatlon No. 2775 <br />CA ELAP Certification No. 2810 <br />