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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services <br />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 />tc Result <br />Reporting <br />Lung I rugs <br />Spike <br />Le, el <br />Source <br />Result %REC <br />%RE(. <br />Limits RID <br />RP!) <br />Lung NOteS <br />Batch B207068 - EPA 503013 <br />Nlatrix Spike Dup (3207068-MS1)D Source: 2207009-01 Prepared & Anal zed. 07/12/22 <br />Surrogate: 1,2-Dichloroethane-d4 0 608 mg/kg 0.600 101 70-130 <br />Surrogate: 4-Bromafluorobenzene 0.764 0.600 127 70-130 <br />Surrogate: Toluene-d8 0.608 0.600 101 70-130 <br />Benzene 0.283 0.060 0.300 ND 94.3 70-130 2.10 20 <br />Ethylbenzene 0.439 0.060 0.300 0_0680 124 70-130 1.84 20 <br />Toluene 0.308 0.060 0.300 NI) 103 70-130 1.61 20 <br />Xylenes, total 1.20 0.060 0.900. 0.340 95.6 70-130 19.5 20 <br />Cea„ (niu <br />Clan i .1 Cone - "Fechnieal Manager <br />Page 6 of 7