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Excelchem Laboratories, Inc. Ancon Environmental Project: TSS/Ranjeet Singh 570 Business Park Dr. Project Number: 400-13-30024 Date Reported: Lincoln, CA 95678 Project Manager: Jason Morgan 12/08/20 17:38 Total Recoverable Metals - Quality Control Analyte Result Re ,pprting Limit Units Spike Source Level Result %REC %REC Limits RPD RPD Limit Notes Batch AAL0080 - EPA 6010B LCS (AAL0080-BS1) Prepared: 12/02/20 Analyzed: 12/08/20 Antimony 100 0.5 mg/kg 100 100 80-120 Arsenic 97.6 0.5 100 97.6 80-120 Barium 103 0.5 " 100 103 80-120 Beryllium 97.6 0.5 II 100 97.6 80-120 Cadmium 98.3 0.5 " 100 98.3 80-120 Chromium 102 0.5 II 100 102 80-120 Cobalt 101 0.5 II 100 101 80-120 Copper 94.3 0.5 100 94.3 80-120 Lead 99.1 0.5 ,, 100 99.1 80-120 Molybdenum 102 0.5 ,, 100 102 80-120 Nickel 101 0.5 ,, 100 101 80-120 Selenium 94.9 0.5 100 94.9 80-120 Silver 98.0 0.5 100 98.0 80-120 Thallium 98.6 0.5 ,, 100 98.6 80-120 Vanadium 98.0 0.5 100 98.0 80-120 Zinc 96.6 0.5 " 100 96.6 80-120 LCS Dup (AAL0080-BSD1) Prepared: 12/02/20 Analyzed: 12/08/20 Antimony 90.7 0.5 mg/kg 100 90.7 80-120 10.2 25 Arsenic 88.0 0.5 100 88.0 80-120 10.3 25 Barium 97.8 0.5 100 97.8 80-120 5.53 25 Beryllium 87.8 0.5 100 87.8 80-120 10.5 25 Cadmium 88.8 0.5 ., 100 88.8 80-120 10.2 25 Chromium 92.2 0.5 100 92.2 80-120 10.3 25 Cobalt 91.0 0.5 el 100 91.0 80-120 10.4 25 Copper 84.6 0.5 ,, 100 84.6 80-120 10.8 25 Lead 89.4 0.5 ,, 100 89.4 80-120 10.2 25 Molybdenum 92.2 0.5 100 92.2 80-120 10.6 25 Nickel 91.3 0.5 t, 100 91.3 80-120 10.1 25 Selenium 86.1 0.5 " 100 86.1 80-120 9.78 25 Silver 92.8 0.5 " 100 92.8 80-120 5.44 25 Thallium 89.5 0.5 " 100 89.5 80-120 9.71 25 Vanadium 89.0 0.5 II 100 89.0 80-120 9.67 25 Zinc 87.3 0.5 100 87.3 80-120 10.1 25 Excelchem Laboratories_ Inc The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Laboratory Representative Page 11 of 13