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Project: <br />Project Number: <br />Project Manager: <br />Reported: <br />Brusca Associates Inc. <br />PO Box 332 137-002 <br />Joe Brusca <br />Lathrop 48-Ac Property <br />04/30/18 17:08Roseville CA, 95661 <br />25712 Commercentre Drive <br />Lake Forest, California 92630 <br />949.297.5020 Phone <br />949.297.5027 Fax <br />Result Limit <br />Reporting <br />Units Level <br />Spike <br />Result <br />Source <br />%REC <br />%REC <br />Limits RPD <br />RPD <br />Limit Notes Analyte <br />Metals by EPA 6020 Method - Quality Control <br />SunStar Laboratories, Inc. <br />Batch 8042319 - STLC Metals <br />Blank (8042319-BLK1)Prepared: 04/23/18 Analyzed: 04/30/18 <br />Vanadium ug/l1.01 0.25 QB-01, <br />STLC <br />Zinc "0.690 0.25 QB-01, <br />STLC <br />LCS (8042319-BS1)Prepared: 04/23/18 Analyzed: 04/30/18 <br />Arsenic ug/l45.9 0.25 50.0 STLC80-12091.7 <br />Barium "51.1 0.25 50.0 STLC80-120102 <br />Cadmium "45.4 0.25 50.0 STLC80-12090.8 <br />Chromium "45.9 0.25 50.0 STLC80-12091.8 <br />Lead "44.8 0.25 50.0 STLC80-12089.5 <br />Matrix Spike (8042319-MS1)Prepared: 04/23/18 Analyzed: 04/30/18 Source: T181179-09 <br />Arsenic ug/l55.4 0.25 50.0 8.92 STLC75-12593.0 <br />Barium "174 0.25 50.0 115 STLC75-125117 <br />Cadmium "46.3 0.25 50.0 0.251 STLC75-12592.0 <br />Chromium "67.0 0.25 50.0 15.5 STLC75-125103 <br />Lead "102 0.25 50.0 50.7 STLC75-125103 <br />Matrix Spike Dup (8042319-MSD1)Prepared: 04/23/18 Analyzed: 04/30/18 Source: T181179-09 <br />Arsenic ug/l70.7 0.28 56.8 8.92 20 QR-04, <br />STLC <br />75-125109 24.3 <br />Barium "211 0.28 56.8 115 20 QR-04, <br />STLC <br />75-125169 19.4 <br />Cadmium "60.2 0.28 56.8 0.251 20 QR-04, <br />STLC <br />75-125105 26.2 <br />Chromium "82.6 0.28 56.8 15.5 20 QR-04, <br />STLC <br />75-125118 20.9 <br />Lead "123 0.28 56.8 50.7 20 QR-04, <br />STLC <br />75-125127 17.9 <br />Mike Jaroudi, Project Manager <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 />Page 8 of 9