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Lab No.: STK2335259 <br />Customer No.:3019150 <br />Quality Control - Wet Chem <br />4500N02B <br />Nitrate Nitrogen 4500N03F 05/04/2023:204846LFS <br />(SP 2306958-001) <br />MS <br />MSD <br />MSRPD <br />ND <br />Page 4 of4Page 4 of4Section: Quality Control <br />Type Units Cone. QC Data DQO NoteConstituentMethodDate/ID <br />Wet Chem <br />Nitrite as Nitrogen <br />May 5, 2023 <br />Mike Wutzke <br />04/29/2023:204714AMM <br />(VI 2342586-001) <br />0.2284 <br />0.2284 <br />0.2284 <br />11.22 <br />5.609 <br />5.609 <br />5.609 <br />Blank <br />DQO <br />LCS <br />Office & Laboratory <br />563 E. Lindo Avenue <br />Chico. CA 95926 <br />TEL (530)343-5818 <br />FAX (530)343-3807 <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />MS <br />MSD <br />MSRPD <br />Blank <br />LCS <br />MS <br />MSD <br />MSRPD <br />Office & Laboratory <br />3442 Empresa Drive. Suite D <br />San Luis Obispo. CA 93401 <br />TEL (805)783-2940 <br />FAX: (805)783-29 12 <br />CAELAP Certification No. 2775 <br />Office & Laboratory <br />9415 W. Goshen Avenue <br />Visalia. CA 93291 <br />TEL: (559)734-9473 <br />FAX (559)734-8435 <br />C,\ ELAP Certification No. 2810 <br />1-173 <br />1-173 <br /><20 <br /><0.4 <br />80-120 <br />66-125 <br />66-125 <br />S30.4 <br />87.7% <br />93.6% <br />6.5% <br />ND <br />95.0% <br />94.0% <br />94.0% <br />0.0% <br />ErSVIROHMEnTALAGRICULTURAL <br />Analytical Chemists <br />Corporate Offices & Laboratory Office & Laboratory <br />853 Corporation Street 2500 Stagecoach Road <br />Santa Paula. CA 93060 Stocktori, CA 95215 <br />TEL (805)392-2000 TEL (209)942-0182 <br />EnvFAX (805)525-4172 /Ag FAX (805)392-2063 FAX. (209)942-0423 <br />CA ELAP Certification No. 1573 CA ELAP Certification No 1563 CA ELAP Certification No. 2670 <br />Definition <br />: Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />: Data Quality Objective - This is the criteria against which the quality control data is compared. <br />: Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <br />: 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 />: 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 />: MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation and <br />analysis. <br />: Non-detect - Result was below the DQO listed for the analyte.