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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 />LCS (24B0140 -BSI) <br />Prepared & Analyzed: 02/08/24 <br />Chlorobenzene <br />19.8 <br />1.0 <br />ug/1 20.0 98.8 <br />81.1-121 <br />1,1-Dichloroethene <br />20.4 <br />1.0 <br />20.0 102 <br />69.9-130 <br />Trichloroethene <br />18.8 <br />1.0 <br />20.0 94.0 <br />74.9-133 <br />Benzene <br />19.2 <br />0.50 <br />20.0 95.8 <br />78.1-123 <br />Toluene <br />19.1 <br />0.50 <br />20.0 95.7 <br />79.6-123 <br />Surrogate:4-Bromofluorobenzene 19.7 20.0 98.7 76.7-116 <br />Surrogate: Dibromofluoromethane 20.6 20.0 103 78.7-127 <br />Surrogate: Toluene -d8 20.1 20.0 100 84.7-108 <br />LCS Dup (24B0140-BSDI) <br />Prepared & Analyzed: 02/08/24 <br />Chlorobenzene <br />20.5 <br />1.0 <br />ug/1 20.0 102 <br />81.1-121 <br />3.63 <br />20 <br />1, 1 -Dichloroethene <br />20.7 <br />1.0 <br />20.0 104 <br />69.9-130 <br />1.36 <br />20 <br />Trichloroethene <br />19.5 <br />1.0 <br />20.0 97.3 <br />74.9-133 <br />3.50 <br />20 <br />Benzene <br />19.5 <br />0.50 <br />20.0 97.6 <br />78.1-123 <br />1.86 <br />20 <br />Toluene <br />19.3 <br />0.50 <br />20.0 96.7 <br />79.6-123 <br />1.04 <br />20 <br />Surrogate:4-Bromofluorobenzene 19.8 20.0 98.9 76.7-116 <br />Surrogate: Dibromofluoromethane 20.4 20.0 102 78.7-127 <br />Surrogate: Toluene -d8 20.0 20.0 100 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 8 of 12 <br />