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CALIFORNIA LABORATORY SERVICES <br /> Committed. Responsive. Flexible. <br /> Page 3 of 4 03/24/26 15:38 <br /> Precision Enviro-Tech Project: 2603213 <br /> 935 N.Coronado Ave Project Number: [none) CLS Work Ordet #:26C0850 <br /> Stockton,CA 95204 Project Manager: Jonathan H V Lee COC#: <br /> EDB and DBCP by EPA Method 504.1 -Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analvic R—uh Limit Units Level Result %.REC Limits RPD Limit <br /> Batch 2602186-EPA 504.1 <br /> Blank(2602186-BLKI) Prepared&Analyzed:03/19/26 <br /> Ethylenedibromide ND 0.020 µg%L <br /> 1,2-Dibromo-3-chloropropane ND 0.010 " <br /> LCS(2602186-BSl) Prepared&Analyzed:03/19/26 •___�_.__._._._ <br /> Ethylene dibromidc 0.276 0.020 µg/L 0.286 97 70430 <br /> 1.2-Dibromo-3-chloropropane 0.257 0,010 0.286 90 70-130 <br /> LCS Dup(2602186-BSDI) Prepared&Analyzed 03/19/26 <br /> Ethylene dibromide 0.306 0,020 µg/L 0.286 107 70-130 10 30 <br /> 1 2-Dibromo-3-chloropropane 0.296 0.010 0.286 100 70-130 Il 30 <br /> Matrix Spike(2602186-MS1) Source:26CO746-01 Prepared&Analyzed:03/19/26 TQRL-2 <br /> F,thylcnc dibromidc 0.571 0.040 µg/L 0.571 ND 100 65-135 <br /> 1.2-Dibromo-3-chloropropane 1.44 0.020 0.571 0.499 165 65-135 QM-7 <br /> Matrix Spike Dup(2602186-MSDI) Source:26CO746-01 Prepared&Analyzed:03/19/26 _ QRL-2 <br /> Ethylene dibromidc 0.569 0.040 µgtL 0.571 ND too 65-135 0.4 30 <br /> 1,2-Dibromo-3-chloropropane 1.50 0.020 0,571 0,499 174 65-135 4 30 QM-7 <br /> 3249 Fitzgerald Road,Rancho Cordova,CA 95742 1 800.638.7301 1 Tel:916.638.7301 x102 l Fax:916.638.4510 1 www.californialab.com <br /> Small Business#2916 1 ELAP#1233 1 NAICS#541380 1 CA SWRCB ELAP Accreditation/Registration Number 1233 <br /> For regulatory purposes,please refer to www.caldornialab.com/certifications to find a list of approved analytes by method. <br /> Page 10 of 11 <br />