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CALIFORNIA LABORATORY SERVICES <br /> Committed. Responsive. Flexible. <br /> Page 3 of 4 04/10/26 15:32 <br /> Precision Enviro-Tech Project: 2604060 <br /> 3935 N.Coronado Ave Project Number: [none] CLS Work Order#:26DO268 <br /> Stockton,CA 95204 Project Manager: Jonathan HV Lee COC#: <br /> EDB and DBCP by EPA Method 504.1 - Quality Control <br /> Reporting Spike Source %REC RPD <br /> lAnal,ic Rc,uh Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2602837-EPA 504.1 <br /> Blank(2602837-BLKI) Prepared&Analyzed:04/09/26 <br /> Ethylene dibromide ND 0.020 µg/L <br /> 1,2-Dibromo-3-chloropropane ND 0.010 " <br /> LCS(2602837-BSI) Prepared&Analyzed:04/09/26 <br /> Ethylene dibromide 0.281 0.020 µg/L 0.286 98 70-130 <br /> 1,2-Dibromo-3-chloropropane 0.343 0.010 0.286 120 70-130 <br /> LCS Dup(2602837-BSD1) Prepared&Analyzed:04/09/26 <br /> Ethylene dibromide 0.304 0.020 µg/L 0.286 106 70-130 8 30 <br /> 1,2-Dibromo-3-chloropropane 0.310 0.010 0.286 109 70-130 10 30 <br /> Matrix Spike(2602837-MS1) Source:26DO571-03 Prepared&Analyzed:04/09/26 QRL-2 <br /> Ethylene dibromide 0.559 0.040 µg/L 0.571 ND 98 65-135 <br /> 1,2-Dibromo-3-chloropropane 0.574 0.020 0.571 ND 100 65-135 <br /> Matrix Spike Dup(2602837-MSD1) Source:26DO571-03 Prepared&Analyzed:04/09/26 QRL-2 <br /> Ethylene dibromide 0.512 0.040 µg/L 0.571 ND 90 65-135 9 30 <br /> 1,2-Dibromo-3-chloropropane 0,636 0.020 0.571 ND 111 65-135 10 30 <br /> 3249 Fitzgerald Road,Rancho Cordova,CA 95742 1 800.638.7301 1 Tel:916.638.7301 x102 I 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.califomialab.com/certifications to find a list of approved analytes by method. <br /> Page 10 of 11 <br />