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ENVIRONMENTAINW. . , Analytical Chemists San joaquin County Customer No. : 3017919 Quality Control -Wet Chem Nitrite as Nitrogen 300.0 05/12/2022:205251NJB Blank mg/L ND <0.4 LCS mg/L 15.00 99.6% 90-110 MS mg/L 30.00 98.5% 74-126 (SP 2206932-001) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 2.8% :520 MS mg/L 30.00 98.2% 74-126 (CH 2272913-003) MSD mg/L 30.00 99.5% 74-126 MSRPD mg/L 10.00 1.3% :520 Sulfate 300.0 05/12/2022:205251NJB Blank mg/L ND <0.5 LCS mg/L 50.00 102% 90-110 MS mg/L 100.0 95.9% 82-124 (SP 2206932-001) MSD mg/L 100.0 99.0% 82-124 MSRPD mg/L 10.00 2.7% <_23 MS mg/L 100.0 93.3% 82-124 (CH 2272913-003) MSD mg/L 100.0 94.6% 82-124 MSRPD mg/L 10.00 0.9% :523 MBAS 5540C 05/13/2022:205504JBA MS mg/L 10.00 100% 90-110 (STK2236645-001) MSD mg/L 10.00 100% 90-110 MSRPD mg/L 10.00 0.0% :50.1 Definition Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. Dup : Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication of precision for the preparation and analysis. LCS : Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS : Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD : MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND : Non-detect-Result was below the DQO listed for the analyte. Page 6 of 6 Page 6 of 6 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo Avenue 3442 Empresa Drive,Suite D 9415 W.Goshen Avenue Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 CA ELAP Certification No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810