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SunStar 25712 Commercentre Drive <br /> Laboratories, Inc. Lake Forest,California 92630 <br /> 949.297.5020 Phone <br /> PROVIDING QUALITY ANALYTICAL SERVICES NATIONWIDE <br /> 949.297.5027 Fax <br /> Brusca Associates Inc. Project: Lathrop 48-Ac Property <br /> PO Box 332 Project Number: 137-002 Reported: <br /> Roseville CA,95661 Project Manager: Joe Brusca 04/30/18 17:08 <br /> Metals by EPA 6020 Method-Quality Control <br /> SunStar Laboratories,Inc. <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 8042319-STLC Metals <br /> Blank(8042319-BLKI) Prepared:04/23/18 Analyzed:04/30/18 <br /> Vanadium 1.01 0.25 ug/I QB-01, <br /> STLC <br /> Zinc 0.690 0.25 QB-01, <br /> STLC <br /> LCS(8042319-BSI) Prepared:04/23/18 Analyzed:04/30/18 <br /> Arsenic 45.9 0.25 ug/I 50.0 91.7 80-120 STLC <br /> Barium 51.1 0.25 50.0 102 80-120 STLC <br /> Cadmium 45.4 0.25 50.0 90.8 80-120 STLC <br /> Chromium 45.9 0.25 50.0 91.8 80-120 STLC <br /> Lead 44.8 0.25 50.0 89.5 80-120 STLC <br /> Matrix Spike(8042319-MSI) Source:T181179-09 Prepared:04/23/18 Analyzed:04/30/18 <br /> Arsenic 55.4 0.25 ug/l 50.0 8.92 93.0 75-125 STLC <br /> Barium 174 0.25 50.0 115 117 75-125 STLC <br /> Cadmium 46.3 0.25 50.0 0.251 92.0 75-125 STLC <br /> Chromium 67.0 0.25 50.0 15.5 103 75-125 STLC <br /> Lead 102 0.25 50.0 50.7 103 75-125 STLC <br /> Matrix Spike Dup(8042319-MSD1) Source:T181179-09 Prepared:04/23/18 Analyzed:04/30/18 <br /> Arsenic 70,7 0.28 ug/I 56.8 8.92 109 75-125 24.3 20 QR-04, <br /> STLC <br /> Barium 211 0.28 56.8 115 169 75-125 19.4 20 QR-04, <br /> STLC <br /> Cadmium 60.2 0.28 56.8 0.251 105 75-125 26.2 20 QR-04, <br /> STLC <br /> Chromium 82.6 0.28 56.8 15.5 118 75-125 20.9 20 QR-04, <br /> STLC <br /> Lead 123 0.28 56.8 50.7 127 75-125 17.9 20 QR-04, <br /> STLC <br /> SunStar 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 /> Mike Jaroudi,Project Manager Page 8 of <br />