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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 <br />Certificate No. 2480 <br />Phone: (209) 384-2930 <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 B212027 - EPA 50308 <br />Blank (B212027-BLK1) Prepared & Analyzed: 12/12/22 <br />Surrogate: 1,2-Dich1oromhane-d4 0.281 mg/kg 0.300 93.7 70-130 <br />Surrogate: 4-Bromofluorobenzene 0.403 0.300 134 70-130 <br />Surrogate: Toluene-d8 0.298 0.300 99.3 70-130 <br />Benzene ND 0.060 <br />Ethylbenzene ND 0.060 <br />Toluene ND 0.060 I/ <br />Xylenes, total ND 0.060 11 <br />LCS (B212027-BS1) Prepared & Analyzed: 12/12/22 <br />Surrogate: 1,2-Dichloroethcme-d4 0.275 mg/kg 0.300 91.7 70-130 <br />Surrogate: 4-Bromofluorobenzene 0.359 0.300 120 70-130 <br />Surrogate: Toluene-d8 0.293 0.300 97.7 70-130 <br />Benzene 0.241 0.060 ,, 0.280 86.1 70-130 <br />Ethylbenzene 0.274 0.060 . 0.280 97.9 70-130 <br />Toluene 0.235 0.060 /I 0.280 83.9 70-130 <br />Xylenes, total 0.768 0.060 0.838 91.6 70-130 <br />LCS Dup (B212027-BSD I) Prepared & Analyzed: 12/12/22 <br />Surrogate: 1,2-Dichloroethane-d4 0.275 mg/kg 0.300 91.7 70-130 <br />Surrogate: 4-Bromeuorobenzene 0.329 ll 0.300 110 70-130 <br />Surrogate: Toluene-d8 0.294 /I 0.300 98.0 70-130 <br />Benzene 0.240 0.060 0.280 85.7 70-130 0.416 20 <br />Ethylbenzene 0.256 0.060 0.280 91.4 70-130 6.79 20 <br />Toluene 0.235 0.060 0.280 83.9 70-130 0.00 20 <br />Xylenes, total 0.754 0.060 . 0.838 90.0 70-130 1.84 20 <br />Clan i 1. Cone - Technical Manager <br />Page 5 of 6