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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 °/uREC Limits RPD Limit Notes <br /> Batch 8042318-STLC Metals <br /> Matrix Spike(8042318-MSI) Source:T181179-06 Prepared:04/23/18 Analyzed:04/26/18 <br /> Arsenic 72.5 1.0 ug/l 50.0 27.8 89.2 75-125 <br /> Barium 611 1.0 50.0 521 178 75-125 QM-PS <br /> Cadmium 46.0 1.0 50.0 0.966 90.1 75-125 <br /> Chromium 121 LO 50.0 53.8 134 75-125 QM-PS <br /> Lead 168 2.0 50.0 112 112 75-125 <br /> Matrix Spike Dup(8042318-MSD1) Source:T181179-06 Prepared:04/23/18 Analyzed:04/26/18 <br /> Arsenic 73.4 1.0 ug/l 50.0 27.8 91.2 75-125 1.36 20 <br /> Barium 595 1.0 50.0 521 147 75-125 2.61 20 QM-PS <br /> Cadmium 47.4 1.0 50.0 0.966 92.9 75-125 2.97 20 <br /> Chromium 124 1.0 50.0 53.8 141 75-125 2.85 20 QM-PS <br /> Lead 164 2.0 50.0 112 104 75-125 2.22 20 <br /> Post Spike(8042318-PSI) Source:T181179-06 Prepared:04/23/18 Analyzed:04/26/18 <br /> Barium 287 ug/l 25.0 261 104 80-120 <br /> Chromiwn 56.2 25.0 26.9 117 80-120 <br /> Batch 8042319-STLC Metals <br /> Blank(8042319-BLKI) Prepared:04/23/18 Analyzed:04/30/18 <br /> Antimony ND 0.25 ug/l 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 /> 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 7 of 9 <br />