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Lab No. <br />Customer No. <br />Quality Control - Wet Chem <br />4500N03F 01/23/2026:200785MMl <br />(CH 2670667-001) <br />MSD <br />MSRPD <br />ND <br />Section: Quality Control Page 4 of4 <br />Units Cone.DQO NoteQC DataMethodDate/ID TypeConstituent <br />Wet Chem <br />Nitrate Nitrogen <br />January 28, 2026 <br />Keith Gross Wells & Pumps <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. <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />mg/L <br />11.22 <br />5.609 <br />5.609 <br />: STK2631023 <br />:3016059 <br />ND <br />95.4% <br />92.4% <br />93.1% <br />0.7% <br />Corporate Offices & Laboratory <br />853 Corporation Street <br />Santa Paula. CA 93060 <br />TEL (805)392-2000 <br />CA ELAP Certification No. 1573 <br />Office & Laboratory <br />2500 Stagecoach Road <br />Stockton, CA 95215 <br />TEL (209)942-0182 <br />CA ELAP Certification No. 1563 <br />Office & Laboratory <br />563 E. Lindo Avenue <br />Chico. CA 95926 <br />TEL: (530)343-5818 <br />CA ELAP Certification No. 2670 <br />Office & Laboratory <br />3442 Empress Drive. Suite D <br />San Luis Obispo, CA 93401 <br />TEL: (805)783-2940 <br />CA ELAP Certification No. 2775 <br />Blank <br />LCS <br />MS <br />MSD <br />MSRPD <br /><0.4 <br />80-120 <br />66-125 <br />66-125 <br /><30.4 <br />Page 4 of 4 <br />Office & Laboratory <br />9411 W. Goshen Avenue <br />Visalia. CA 93291 <br />TEL: (559)734-9473 <br />CA ELAP Certification No. 2810 <br />FGL <br />ENVIRONMENTAL^^ AGRICULTURAL <br />Analytical Chemists <br />Definition <br />Blank : <br />DQO : <br />LCS : <br />MS :