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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 B207068 - EPA 5030B <br />Blank (B207068-BLK I) Prepared & Analyzed: 07/12/22 <br />Surrogate: 1.2-Dichloroethane-d4 0.562 mg kg 0.600 93.7 70-130 <br />Surrogate: 4-Brontofluoroben:ette 0.565 0.600 94.2 70-130 <br />Surrogate: Toluene-d8 0.510 0.600 85.0 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 (B207068-BS1) Prepared & Analyzed: 07/12/22 <br />Surrogate: 1,2-Dschloroethane-d4 0.626 mg/kg 0.600 104 70-130 <br />Surrogate: 4-Brontofluorobetmene 0.607 " 0.600 101 70-130 <br />Surrogate: Toluene-d8 0.604 " 0.600 101 70-130 <br />Benzene 0.280 0.060 0.300 93.3 70-130 <br />Ethylbenzene 0.305 0.060 0.300 102 70-130 <br />Toluene 0.292 0.060 0.300 97.3 70-130 <br />Xylenes, total 0.913 0.060 " 0.900 101 70-130 <br />LCS Dup (B207068-BSD1) Prepared & Analyzed: 07/12/22 <br />Surrogate: 1,2-Dichloroethane-d4 0.607 mg/kg 0.600 101 70-130 <br />Surrogate: 4-Bromolluorobetrene 0.648 m 0.600 108 70-130 <br />Surrogate: Toluene-d8 0.610 .. 0.600 102 70-130 <br />Benzene 0.292 0.060 0.300 97.3 70-130 4.20 20 <br />Ethylbenzene 0.317 0.060 0.300 106 70-130 3.86 20 <br />Toluene 0.288 0.060 " 0.300 96.0 70-130 1.38 20 <br />Xylenes, total 0.961 0.060 " 0.900 107 70-130 5.12 20 <br />Matrix Spike (B207068-MSI) Source: 2207009-01 Prepared & Analyzed 07/12/22 <br />Surrogate: 1.2-Dtchloroethane-d4 0.604 mg/kg 0.600 101 70-130 <br />Surrogate: 4-Bromofluorobenzene 0.832 0.600 139 70-130 <br />Surrogate: Toluene-d8 0.593 . 0.600 98.8 70-130 <br />Benzene 0.289 0.060 0.300 ND 96.3 70-130 <br />Ethylbenzene 0.431 0.060 . 0.300 0.0680 121 70-130 <br />Toluene 0.313 0.060 . 0.300 ND 104 70-130 <br />Xylenes, total 1.46 0.060 0.900 0.340 124 70-130 <br />Clan i J. Cone - Technical Manager <br />Page 5 of 7