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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 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 13210029- EPA 5035 <br />Blank (B210029-BLK1) Prepared & Analyzed: 10/10/22 <br />Surrogate: 4-Bromeuorobenzene 0.0105 mg/kg 0.0100 105 70-130 <br />Surrogate: 1,2-Dichloroethane-d4 0.00942 0.0100 94.2 70-130 <br />Surrogate: Toluene-d8 0.00884 H 0.0100 88.4 70-130 <br />Benzene ND 0.0030 <br />Ethylbenzene ND 0.0030 <br />Toluene ND 0.0030 <br />Xylenes, total ND 0.0030 I/ <br />LCS (B210029-BS1) Prepared & Analyzed: 10/10/22 <br />Surrogate: 4-Bromeuorobenzene 0.0110 mg/kg 0.0100 110 70-130 <br />Surrogate: 1,2-Dichloroethane-d4 0.0100 0.0100 100 70-130 <br />Surrogate: Toluene-d8 0.00934 0.0100 93.4 70-130 <br />Benzene 0.00412 0.0030 " 0.00500 82.4 70-130 <br />Ethylbenzene 0.00584 0.0030 " 0.00500 117 70-130 <br />Toluene 0.00410 0.0030 ,, 0.00500 82.0 70-130 <br />Xylenes, total 0.0159 0.0030 0.0150 106 70-130 <br />LCS Dup (B210029-BSD1) Prepared & Analyzed: 10/10/22 <br />Surrogate: 4-Bromolluorobenzene 0.0111 mg/kg 0.0100 111 70-130 <br />Surrogate: 1,2-Dichloroethane-d4 0.0110 0.0100 110 70-130 <br />Surrogate: Toluene-d8 0.0106 0.0100 106 70-130 <br />Benzene 0.00472 0.0030 ,, 0.00500 94.4 70-130 13.6 20 <br />Ethylbenzene 0.00524 0.0030 0.00500 105 70-130 10.8 20 <br />Toluene 0.00476 0.0030 0.00500 95.2 70-130 14.9 20 <br />Xylenes, total 0.0151 0.0030 0.0150 100 70-130 5.17 20 <br />Matrix Spike (B210029-MS1) Source: 2210027-01 Prepared & Analyzed: 10/10/22 <br />Surrogate: 4-Bromofluorobenzene 0.0192 mg/kg 0.0200 96.2 70-130 <br />Surrogate: 1,2-Dichloroethane-d4 0.0222 0.0200 111 70-130 <br />Surrogate: Toluene-d8 0.0190 II 0.0200 95.2 70-130 <br />Benzene 0.0118 0.0060 0.0100 ND 118 70-130 <br />Ethylbenzene 0.0127 0.0060 0.0100 0.00372 89.6 70-130 <br />Toluene 0.0147 0.0060 n 0.0100 0.00704 76.4 70-130 <br />Xylenes, total 0.0384 0.0060 ,, 0.0301 0.0117 88.8 70-130 <br />t,7 <br />Ugitt <br />Clan i J. Cone - Technical Manager <br />Page 5 of 7