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Excelchem Laboratories, Inc. <br />Ancon Environmental <br />Project: Stockton Custard <br />570 Business Park Dr. Project Number: 1061985 <br />Date Reported: <br />Lincoln, CA 95678 <br />Project Manager: Nolan Ryan 08/15/22 10:20 <br />Total Recoverable Metals - Quality Control <br />Analyte Result <br />RcpoiIinz <br />I. iiiiit <br />Spike Source %REC RPD <br />Units Level Result %REC Limits RPD Limit Notes <br />Batch A'G0209 - EPA 7471A <br />Blank (A'G0209-BLK1) <br />Prepared: 07/28/22 Analyzed: 08/02/22 <br />Mercury ND 0.016 mg/kg <br />LCS (KG0209-BS1) <br />Prepared: 07/28/22 Analyzed: 08/02/22 <br />Mercury 0.204 0.016 mg/kg 0.200 102 80-120 <br />LCS Dup (A‘G0209-BSD1) <br /> <br />Prepared: 07/28/22 Analyzed: 08/02/22 <br />Mercury 0.198 0.016 mg/kg 0.200 99.2 80-120 2.78 20 <br />Matrix Spike (A'G0209-MS1) <br />Source: 2207177-01 Prepared: 07/28/22 Analyzed: 08/02/22 <br />Mercury 0.194 0.016 mg/kg 0.200 0.0808 56.4 75-125 QL-01 <br />Matrix Spike Dup (AsG0209-MSD1) <br /> <br />Source: 2207177-01 Prepared: 07/28/22 Analyzed: 08/02/22 <br />Mercury 0.197 0.016 mg,/kg 0.200 0.0808 58.0 75-125 1.64 20 QL-01 <br />Excelchem Laboratories. Inc. The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. This analytical report must be reproduced in its entirety. <br />Laboratory Representative Page 4 of 5