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SunStar <br />Laboratories, Inc. <br />PROVIDING QUALITY ANALYTICAL SERVICES NATIONWIDE <br />25712 Commercentre Drive <br />Lake Forest, California 92630 <br />949.297.5020 Phone <br />949.297.5027 Fax <br />Aptim - Concord Project: Safeway Station - Country Club Blvd - Stockton <br />4005 Port Chicago Hwy, Suite 200 Project Number: 63103 6009.00321320 Reported: <br />Concord CA, 94520 Project Manager: Scott Bittinger 02/09/24 15:56 <br />Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />SunStar Laboratories, Inc. <br />Reporting Spike Source %REC RPD <br />analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 24BO140 - EPA 5030 GCMS <br />Blank (24B0140-BLK1) <br />Prepared & Analyzed: 02/08/24 <br />p-Isopropyltoluene <br />ND <br />1.0 ug/1 <br />Methylene chloride <br />ND <br />5.0 <br />Naphthalene <br />ND <br />1.0 <br />n-Propylbenzene <br />ND <br />1.0 " <br />Styrene <br />ND <br />1.0 " <br />1,1,2,2 -Tetrachloroethane <br />ND <br />1.0 " <br />1,1,1,2 -Tetrachloroethane <br />ND <br />1.0 " <br />Tetrachloroethene <br />ND <br />1.0 <br />1,2,3-Trichlorobenzene <br />ND <br />1.0 <br />1,2,4-Trichlorobenzene <br />ND <br />1.0 <br />1,1,2 -Trichloroethane <br />ND <br />1.0 <br />1,1,1 -Trichloroethane <br />ND <br />1.0 <br />Trichloroethene <br />ND <br />1.0 <br />Trichlorofluoromethane <br />ND <br />1.0 " <br />1,2,3-Trichloropropane <br />ND <br />1.0 <br />1,3,5-Trimethylbenzene <br />ND <br />1.0 " <br />1,2,4-Trimethylbenzene <br />ND <br />1.0 " <br />Vinyl chloride <br />ND <br />0.50 <br />Benzene <br />ND <br />0.50 <br />Toluene <br />ND <br />0.50 " <br />Ethylbenzene <br />ND <br />0.50 <br />m,p-Xylene <br />ND <br />2.0 <br />o -Xylene <br />ND <br />0.50 " <br />Acetone <br />ND <br />5.0 <br />Methyl ethyl ketone <br />ND <br />5.0 <br />Methyl isobutyl ketone <br />ND <br />5.0 " <br />2-Hexanone (MBK) <br />ND <br />5.0 <br />TPH-GRO <br />ND <br />50 <br />Surrogate: 4-Bromofluorobenzene 19.3 20.0 96.5 76.7-116 <br />Surrogate: Dibromofluoromethane 20.6 20.0 103 78.7-127 <br />Surrogate: Toluene -d8 20.2 20.0 101 84.7-108 <br />SunStar Laboratories, Inc. <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. This analytical report must be reproduced in its entirety. <br />Joann Marroquin, Director of Operations Page 7 of 12 <br />