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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 Fuel Station No. 1769, Stockton, CA <br />4005 Port Chicago Hwy, Suite 200 Project Number: 631036009.00321320 Reported: <br />Concord CA, 94520 Project Manager: Scott Bittinger 02/15/24 16:16 <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 24BO253 - EPA 5030 GCMS <br />Blank (24130253-BLK1) <br />Prepared & Analyzed: 02/14/24 <br />1,2-Dibromoethane (EDB) <br />ND <br />2.5 ug/kg <br />1,2-Dichloroethane <br />ND <br />2.5 " <br />Naphthalene <br />ND <br />2.5 <br />Benzene <br />ND <br />2.5 <br />Toluene <br />ND <br />2.5 " <br />Ethylbenzene <br />ND <br />2.5 " <br />m,p-Xylene <br />ND <br />5.0 " <br />o -Xylene <br />ND <br />2.5 " <br />Tert-amyl methyl ether <br />ND <br />10 " <br />Tert-butyl alcohol <br />ND <br />25 <br />Di -isopropyl ether <br />ND <br />10 " <br />Ethyl tert-butyl ether <br />ND <br />10 <br />Methyl tert-butyl ether <br />ND <br />10 <br />TPH-GRO <br />ND <br />250 " <br />Surrogate: Toluene -d8 47.2 50.0 94.4 83.2-113 <br />Surrogate:4-Bromofluorobenzene 50.4 50.0 101 82.9-116 <br />Surrogate: Dibromofluoromethane 41.8 50.0 83.6 80.4-132 <br />LCS (24130253-13SI) <br />Prepared & Analyzed: 02/14/24 <br />Chlorobenzene <br />52.9 <br />2.5 <br />ug/kg 50.0 106 <br />65.2-124 <br />1, 1 -Dichloroethene <br />46.8 <br />2.5 <br />50.0 93.5 <br />60.9-131 <br />Trichloroethene <br />50.7 <br />2.5 <br />50.0 101 <br />62.1-126 <br />Benzene <br />51.4 <br />2.5 <br />50.0 103 <br />65.3-127 <br />Toluene <br />48.9 <br />2.5 <br />50.0 97.8 <br />64.3-122 <br />Surrogate: Toluene -d8 47.8 50.0 95.7 83.2-113 <br />Surrogate:4-Bromofluorobenzene 48.6 50.0 97.2 82.9-116 <br />Surrogate: Dibromofluoromethane 42.1 50.0 84.1 80.4-132 <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 />