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Section: Quality ControlSection: Quality Control <br />This Page is to be Stamped <br /> <br />October 19, 2022 <br />Valley Operators Lab No.: STK2254546 <br />Customer No.: 3019239 <br /> <br />Quality Control - Wet Chem <br />Constituent Method Date/ID Type Units Conc.QC Data DQO Note <br />Wet Chem <br />BOD 5210B 10/10/2022:312703KQP RgBlk mg/L -0.13 2 <br />LCS mg/L 198.0 88.9%84.6-115 <br />(STK2254447-001)Dup mg/L 16.8%15.9 440 <br />(STK2254447-001)Dup mg/L 43.7%15.9 440 <br />Definition <br />DQO :Data Quality Objective - This is the criteria against which the quality control data is compared. <br />Dup :Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an <br />indication of precision for the preparation and analysis. <br />LCS :Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <br />ND :Non-detect - Result was below the DQO listed for the analyte. <br />RgBlk :Method Reagent Blank - Prepared to correct for any reagent contributions to sample result. <br />Explanation <br />440 :Sample nonhomogeneity may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br />Corporate Offices & Laboratory <br />853 Corporation Street <br />Santa Paula, CA 93060 <br />TEL: (805)392-2000 <br />Env FAX: (805)525-4172 / Ag FAX: (805)392-2063 <br />CA ELAP Certification No. 1573 <br />Office & Laboratory <br />2500 Stagecoach Road <br />Stockton, CA 95215 <br />TEL: (209)942-0182 <br />FAX: (209)942-0423 <br />CA ELAP Certification No. 1563 <br />Office & Laboratory <br />563 E. Lindo Avenue <br />Chico, CA 95926 <br />TEL: (530)343-5818 <br />FAX: (530)343-3807 <br />CA ELAP Certification No. 2670 <br />Office & Laboratory <br />9415 W. Goshen Avenue <br />Visalia, CA 93291 <br />TEL: (559)734-9473 <br />FAX: (559)734-8435 <br />CA ELAP Certification No. 2810 <br />Office & Laboratory <br />3442 Empresa Drive, Suite D <br />San Luis Obispo, CA 93401 <br />TEL: (805)783-2940 <br />FAX: (805)783-2912 <br />CA ELAP Certification No. 2775 <br />ENVIRONMENTAL AGRICULTURAL <br />Analytical Chemists