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Laboratories Inc. � �_ <br /> Environmental Testing Laboratory Since 1949 <br /> Enviro Tech Consultants, Inc. Reported: 09/26/2018 15:50 <br /> 5400 Rosedale Highway Project: Sump Remediation <br /> Bakersfield,CA 93308 Project Number: COL108 <br /> Project Manager: Kelsey Padilla <br /> Total Concentrations (TTLC) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent Lab <br /> Constituent Type Sample ID Result Result Added Units RPD Recovery RPD Recovery Quals <br /> QC Batch ID: B024905 Used client sample: Y- Description: COL34C, 09/12/2018 11:36 <br /> Arsenic DUP 1828629-01 5.0495 5.3548 mg/kg 5.9 20 <br /> MS 1828629-01 5.0495 20.854 20.000 mg/kg 79.0 75-125 <br /> MSD 1828629-01 5.0495 21.613 20.000 mg/kg 3.6 82.8 20 75-125 <br /> QC Batch ID: B024906 Used client sample: Y- Description: COI-3-12A, 09/12/2018 10:55 <br /> Arsenic DUP 1828629-31 3.1241 4.2955 mg/kg 31.6 20 Q01 <br /> MS 1828629-31 3.1241 20.835 20.000 mg/kg 88.6 75-125 <br /> MSD 1828629-31 3.1241 19.505 20.000 mg/kg 6.6 81.9 20 75-125 <br /> The results in this report apply to the samples analyzed in accordance with the chain of custody document.This analytical report must be reproduced in its entirety. <br /> All results listed in this report are for the exclusive use of the submitting party. BC Laboratories,Inc.assumes no responsibility for report alteration,separation,detachment or third party interpretation. <br /> Report ID: 1000797437 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.bclabs.com Page 57 of 58 <br />