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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 <br /> <br />Phone: (209) 384-2930 <br />Certificate No. 2480 <br />Fax: (209) 500-1848 <br />Volatile Organic Compounds by GC/MS - Quality Control <br />Castle Analytical Laboratory <br /> <br />Reporting Spike Source %RE C RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch B210029 - EPA 5035 <br />Matrix Spike Dup (B210029-MSD1) Source: 2210027-01 Prepared & Analyzed: 10/10/22 <br />Surrogate: 4-Bromofluorobenzene 0.0190 mg kg 0.0200 95.2 70-130 <br />Surrogate: 1,2-Dichloroethane-d4 0.0207 II 0.0200 104 70-130 <br />Surrogate: Toluene-d8 0.0184 ll 0.0200 91.8 70-130 <br />Benzene 0.0114 0.0060 0.0100 ND 114 70-130 3.44 20 <br />Ethylbenzene 0.0128 0.0060 0.0100 0.00372 91.2 70-130 1.25 20 <br />Toluene 0.0151 0.0060 0.0100 0.00704 80.8 70-130 2.95 20 <br />Xylenes, total 0.0389 0.0060 0.0301 0.0117 90.4 70-130 1.24 20 <br />Uzz„,,.9c <br />Clan i J. Cone - Technical Manager <br />Page 6 of 7