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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 <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 />Reporting Spike Source %REC RPD <br />Analyse Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch B202052 - EPA 5030B <br />Blank (B202052-BLK1) Prepared & Analyzed: 02/07/22 <br />Surrogate: 1,2-Dichloroethane-d4 <br />Surrogate: Toluene-d8 <br />Surrogate: 4-Bromofluorobenzene <br />0.701 <br />0.626 <br />0.721 <br />mg/kg <br /> <br />0.600 117 <br /> <br />0.600 104 <br /> <br />0.600 120 <br />70-130 <br />70-130 <br />70-130 <br />Benzene ND 0.060 <br />Ethylbenzene ND 0.060 <br />Toluene ND 0.060 <br />Xylenes, total 0.114 0.060 <br />LCS (B202052-BS1) Prepared & Analyzed: 02/07/22 <br />Surrogate: 1,2-Dichloroethane-d4 0.697 mg/kg 0.600 116 70-130 <br />Surrogate: Toluene-d8 0.632 0.600 105 70-130 <br />Surrogate: 4-Bromofluorobenzene 0.655 II 0.600 109 70-130 <br />Benzene 0.295 0.060 0.300 98.3 70-130 <br />Ethylbenzene 0.284 0.060 0.300 94.7 70-130 <br />Toluene 0.301 0.060 n 0.300 100 70-130 <br />Xylenes, total 0.953 0.060 .. 0.900 106 70-130 <br />LCS Dup (B202052-BSD1) Prepared & Analyzed: 02/07/22 <br />Surrogate: 1,2-Dichloroethane-d4 0.695 mg/kg 0.600 116 70-130 <br />Surrogate: Toluene-d8 0.650 0.600 108 70-130 <br />Surrogate: 4-Bromolluorobenzene 0.653 0.600 109 70-130 <br />Benzene 0.289 0.060 o 0.300 96.3 70-130 2.05 20 <br />Ethylbenzene 0.287 0.060 " 0.300 95.7 70-130 1.05 20 <br />Toluene 0.306 0.060 .. 0.300 102 70-130 1.65 20 <br />Xylenes, total 0.918 0.060 0.900 102 70-130 3.74 20 <br />Clan i J. Cone - Technical Manager <br />Page 5 of 6