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CALIFORNIA LABORATORY SERVICES <br /> Committed. Responsive. Flexible. <br /> Page 3 of 4 01/28/26 15:28 <br /> Precision Enviro-Tech Project: 2601213 <br /> 3935 N.Coronado Ave Project Number: [none] CLS Work Order#:26A1008 <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 /> Analvie Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2600498-EPA 504.1 <br /> Blank(2600498-BLK1) Prepared&Analyzed:01/20/26 _ <br /> Ethylene dibromide ND 0.020 µg/L <br /> 1,2-Dibromo-3-chloropropane ND 0.010 " <br /> LCS(2600498-BSI) Prepared&Analyzed:01/20/26 _ <br /> Ethylene dibromide 0.277 0.020 AWL 0.286 97 70-130 <br /> 1,2-Dibromo-3-chloropropane 0.264 0.010 0.286 92 70-130 <br /> LCS Dup(2600498-BSD1) Prepared&Analyzed:01/20/26 <br /> ' Ethylene dibromide 0.284 0.020 µg/L 0.286 99 70-130 2 30 <br /> 1,2-Dibromo-3-chloropropane 0.261 0.010 0.286 91 70-130 1 30 <br /> Matrix Spike(2600498-MSI) Source:26AO732-01 Prepared&Analyzed:01/20/26 _ <br /> Ethylene dibromide 0.279 0.020 µg/L 0.286 ND 98 65-135 <br /> 1,2-Dibromo-3-chloropropane 0.270 0.010 0.286 ND 95 65-135 <br /> Matrix Spike Dup(2600498-MSDI) Source:26AO732-01 Prepared&Analyzed:01/20/26 <br /> Ethylene dibromide 0.288 0.020 µg/L 0.286 ND 101 65-135 3 30 <br /> 1;2-Dibromo-3-chloropropane 0.274 0.010 " 0.286 ND 96 65-135 1 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.calffomialab.com/certifications to find a list of approved analytes by method. <br />