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CALIFORNIA LABORATORY SERVICES <br /> <br />Committed. Responsive. Flexible. <br /> <br />09/27/21 14:52 <br />APEX Envirotech Inc. - Gold River Project: Waterloo Food and Fuel <br />11291 Pyrites Wy. Suite B <br /> Project Number: WFF02.001-QM <br /> <br />CLS Work Order #1: 2110960 <br />Gold River, CA 95670 <br /> Project Manager: Bryan Yates COC # <br />Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />Analyte Result <br />Reporting <br />Limit Units <br />Spike Source <br />Level Result %REC <br />%REC <br />Lim its RPD <br />RPD <br />Limit Notes <br />Batch 2108023 - EPA 5030 Water MS <br />Blank (2108023-BLK1) Prepared & Analyzed: 09/22/21 <br />Naphthalene ND 0.50 p.g/L <br />Benzene ND 0.50 0 <br />Toluene ND 0.50 0 <br />Ethylbenzene ND 0.50 0 <br />Xylenes (total) ND 1.0 0 <br />Di-isopropyl ether ND 0.50 0 <br />Ethyl tert-butyl ether ND 0.50 0 <br />Methyl tert-butyl ether ND 0.50 0 <br />tert-Amyl methyl ether ND 0.50 0 <br />tert-Butyl alcohol ND 5.0 <br />1,2-Dichloroethane ND 0.50 0 <br />1,2-Dibromoethane (EDB) ND 0.50 0 <br />Surrogate: 1,2-Dichloroethane-d4 11.6 10.0 116 66-135 <br />Surrogate: Toluene-d8 10.1 10.0 101 72-125 <br />Surrogate: 4-Bromofluorobenzene 11.3 10.0 113 73-125 <br />LCS (2108023-BS1) Prepared & Analyzed: 09/22/21 <br />Benzene 19.0 0.50 ug/L 20.0 95 52-130 <br />Methyl tert-butyl ether 19.0 0.50 20.0 95 52-130 <br />Surrogate: 1,2-Dichloroethane-d4 11.3 10.0 113 66-135 <br />Surrogate: Toluene-d8 9.98 10.0 100 72-125 <br />Surrogate: 4-Bromofluorobenzene 9.02 10.0 90 73-125 <br />LCS Dup (2108023-BSD1) Prepared & Analyzed: 09/22/21 <br />Benzene 19.5 0.50 p.g/L 20.0 98 52-130 3 30 <br />Methyl tert-butyl ether 18.1 0.50 20.0 90 52-130 5 30 <br />Surrogate: 1,2-Dichloroethane-d4 11.0 10.0 110 66-135 <br />Surrogate: Toluene-d8 9.94 10.0 99 72-125 <br />Surrogate: 4-Bromofluorobenzene 9.05 10.0 91 73-125 <br />3249 Fitzgerald Road, Rancho Cordova, CA 95742 I 800.638.7301 I Tel: 916.638.7301 x102 I Fax: 916.638.4510 I www.californialab.com <br />Small Business #2916 I ELAP #1233 I NA1CS #541380 I CA SWRCB ELAP Accreditation /Registration Number 1233