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SunStar <br />Laboratories, Inc. <br />PROVIDING QUALITY ANALYTICAL SERVICES NATIONWIDE <br />25712 Commercentre Drive <br />Lake Forest, California 92630 <br />949.297.5020 Phone <br />949.297.5027 Fax <br />ERM Project: Stockton SMF3 <br />2525 Natomas Park Drive, Suite 350 Project Number: 0567141 Reported: <br />Sacramento CA, 95833 Project Manager: Alan Leung 10/13/20 09:44 <br />STLC Metals by 6000/7000 Series Methods - Quality Control <br />SunStar Laboratories, Inc. <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 0100128 - STLC Metals <br />Blank (0100128-BLK1) Prepared: 10/01/20 Analyzed: 10/07/20 <br />Chromium ND 5.0 mg/1 <br />Copper ND 5.0 <br />Lead ND 5.0 " <br />Nickel ND 5.0 <br />LCS (0100128-BS1) <br />Prepared: 10/01/20 Analyzed: 10/07/20 <br />Chromium <br />10.8 <br />5.0 <br />mg/l <br />10.0 108 75-125 <br />Lead <br />10.4 <br />5.0 <br />10.0 104 75-125 <br />Matrix Spike (0100128-MS1) <br />Source: T203362-02 <br />Prepared: 10/01/20 Analyzed: 10/07/20 <br />Chromium <br />9.86 <br />5.0 <br />mg/l <br />10.0 ND 98.6 75-125 <br />Lead <br />31.6 <br />5.0 <br />10.0 2.14 294 75-125 QM -05 <br />Matrix Spike Dup (0100128-MSD1) <br />Source: T203362-02 <br />Prepared: 10/01/20 Analyzed: 10/07/20 <br />Chromium <br />9.75 <br />5.0 <br />mg/l <br />10.0 ND 97.5 75-125 1.09 30 <br />Lead <br />31.4 <br />5.0 <br />10.0 2.14 292 75-125 0.751 30 QM -05 <br />Batch 0101317 - STLC Metals <br />Blank (0101317-BLK1) Prepared & Analyzed: 10/07/20 <br />Cadmium ND 5.0 mg/l <br />LCS (0101317-BS1) Prepared & Analyzed: 10/07/20 <br />Cadmium 11.3 5.0 mg/l 10.0 113 75-125 <br />Matrix Spike (0101317-MS1) Source: T203379-01 Prepared & Analyzed: 10/07/20 <br />Cadmium 10.1 5.0 mg/l 10.0 ND 101 75-125 <br />SunStar Laboratories, Inc. <br />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 />Joann Marroquin, Director of Operations Page 5 o£7 <br />