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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 8042318 - STLC Metals <br />Matrix Spike (8042318-MS1)Prepared: 04/23/18 Analyzed: 04/26/18 Source: T181179-06 <br />Arsenic ug/l72.5 1.0 50.0 27.8 75-12589.2 <br />Barium "611 1.0 50.0 521 QM-PS75-125178 <br />Cadmium "46.0 1.0 50.0 0.966 75-12590.1 <br />Chromium "121 1.0 50.0 53.8 QM-PS75-125134 <br />Lead "168 2.0 50.0 112 75-125112 <br />Matrix Spike Dup (8042318-MSD1)Prepared: 04/23/18 Analyzed: 04/26/18 Source: T181179-06 <br />Arsenic ug/l73.4 1.0 50.0 27.8 2075-12591.2 1.36 <br />Barium "595 1.0 50.0 521 20 QM-PS75-125147 2.61 <br />Cadmium "47.4 1.0 50.0 0.966 2075-12592.9 2.97 <br />Chromium "124 1.0 50.0 53.8 20 QM-PS75-125141 2.85 <br />Lead "164 2.0 50.0 112 2075-125104 2.22 <br />Post Spike (8042318-PS1)Prepared: 04/23/18 Analyzed: 04/26/18 Source: T181179-06 <br />Barium ug/l287 25.0 261 80-120104 <br />Chromium "56.2 25.0 26.9 80-120117 <br />Batch 8042319 - STLC Metals <br />Blank (8042319-BLK1)Prepared: 04/23/18 Analyzed: 04/30/18 <br />Antimony ug/lND0.25 STLC <br />Arsenic "0.366 0.25 STLC <br />Barium "4.73 0.25 QB-01, <br />STLC <br />Beryllium "ND 0.25 STLC <br />Cadmium "ND 0.25 STLC <br />Chromium "0.518 0.25 QB-01, <br />STLC <br />Cobalt "ND 0.25 STLC <br />Copper "0.663 0.25 QB-01, <br />STLC <br />Lead "0.269 0.25 STLC <br />Mercury "ND 0.025 STLC <br />Molybdenum "0.282 0.25 STLC <br />Nickel "ND 0.25 STLC <br />Selenium "ND 1.2 STLC <br />Silver "ND 0.25 STLC <br />Thallium "ND 0.25 STLC <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 7 of 9