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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 />Analyte Result <br />Reporting <br />Limit Units <br />Spike Source <br />Level Result %REC <br />%REC <br />Limits RPD <br />RPD <br />Limit Notes <br />Batch B205089 - EPA 5030B <br />Blank (B205089-BLK1) Prepared & Analyzed: 05/26/22 <br />Surrogate: 1,2-Dichloroethane-d4 0.528 mg/kg 0.600 88.0 70-130 <br />Surrogate: 4-Bromafluorobenzene 0.733 0.600 122 70-130 <br />Surrogate: Toluene-d8 0.544 0.600 90.7 70-130 <br />Benzene ND 0.060 <br />Ethylbenzene ND 0.060 <br />Toluene ND 0.060 <br />Xylenes, total ND 0.060 <br />LCS (B205089-BS1) Prepared & Analyzed: 05/26/22 <br />Surrogate: 1,2-Dichloroethane-d4 0.587 mg/kg 0.600 97.8 70-130 <br />Surrogate: 4-Bromolluorobenzene 0.697 0.600 116 70-130 <br />Surrogate: Toluene-d8 0.593 II 0.600 98.8 70-130 <br />Benzene 0.287 0.060 .. 0.300 95.7 70-130 <br />Ethylbenzene 0.305 0.060 .. 0.300 102 70-130 <br />Toluene 0.298 0.060 .. 0.300 99.3 70-130 <br />Xylenes, total 1.00 0.060 .. 0.900 1 1 1 70-130 <br />LCS Dup (B205089-BSD1) Prepared & Analyzed: 05/26/22 <br />Surrogate: 1,2-Dichloroethane-d4 0.496 mg/kg 0.600 82.7 70-130 <br />Surrogate: 4-Bromoiluorobenzene 0.658 0.600 110 70-130 <br />Surrogate: Toluene-d8 0.554 II 0.600 92.3 70-130 <br />Benzene 0.263 0.060 .. 0.300 87.7 70-130 8.73 20 <br />Ethylbenzene 0.286 0.060 .. 0.300 95.3 70-130 6.43 20 <br />Toluene 0.274 0.060 II 0.300 91.3 70-130 8.39 20 <br />Xylenes, total 0.955 0.060 .. 0.900 106 70-130 4.60 20 <br />Clan J. J. Cone - Technical Manager <br />Page 5 of 6