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ENVIRONMENTAL AGRICULTURAL Analytical Chemists November 21 , 2019 Lab ID : STK1956445 Metal Finishing Solutions , Inc. Customer : 348181 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Client Oil and Grease 1664A 11 / 18/ 19 :213282AMM Blank mg/L ND <3 LCS mg/L 44. 89 9647 % 78- 114 BS mg/L 44. 89 94. 1 % 78- 114 BSD mg/L 44. 89 97 . 3 % 78- 114 BSRPD mg/L 44. 89 3 .4% < 18 Total Dissolved Solids (TFR) 2540CE 11 /08/ 19 :212915CTL Blank mg/L 4.9 20 LCS mg/L 993 .0 100 % 90- 110 (SP 1915073 -005) Dup mg/L 0.6% 5 (STK1956571 -001 ) Dup mg/L 0.3 % 5 Blank mg/L ND <20 LCS mg/L 993 .0 98 ,6 % 90- 110 (CC 1983923-001 ) Dup mg/L 1 .3 % 5 (CC 1983923-002) Dup mg/L 0.7% 1 5 Solids, Suspended 2540D 11 /07/ 19 :312456CGH Blank mg/L ND < 1 LCS mg/L 500.0 95 .6 % 61 - 112 LCS mg/L 500.0 9546 % 61 - 112 (STK1956458-001 ) Dup mg/L 8 . 8 % 20 (STK1956617-001 ) Dup mg/L 6 . 1 % 20 BOD 5210B 11 /06/ 19 :300403sm RgBlk mg/L 0.34 2 LCS mg/L 198 .0 91 ,6 % 84.6- 115 (STK1956536-001 ) Dup mg/L 3 .3 % 15 .9 (STK1956536-001 ) Dup mg/L 5 .9 % 15.9 (STK1956536-001 ) 1 Dup I mg/L 1 36. 8% 1 15.9 1 440 5210B 11/ 11 / 19 :300408ct CCV mg/L 1 1 .000 99. 0 % 1 80- 120 Definition CCV : Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples . RgBlk : Method Reagent Blank - Prepared to correct for any reagent contributions to sample result. LCS : Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. BS : Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not affecting analyte recovery. BSD : Blank Spike Duplicate of BS/BSD pair - A blank duplicate is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not affecting analyte recovery. 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 . BSRPD : BS/BSD Relative Percent Difference (RPD) - The BS 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. DQO : Data Quality Objective - This is the criteria against which the quality control data is compared . Explanation 440 : Sample nonhomogeneity may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. Page 9 of 9 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