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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 />Matrix Spike (24B0253-MS1) <br />Source: T240742-01 <br />Prepared & Analyzed: 02/14/24 <br />Chlombenzene <br />45.4 <br />2.5 ug/kg <br />50.0 ND 90.9 <br />65.2-125 <br />1,1-Dichloroethene <br />41.2 <br />2.5 <br />50.0 ND 82.3 <br />60.9-131 <br />Trichloroethene <br />44.8 <br />2.5 <br />50.0 ND 89.7 <br />62.1-126 <br />Benzene <br />44.3 <br />2.5 <br />50.0 ND 88.6 <br />65.3-127 <br />Toluene <br />42.0 <br />2.5 <br />50.0 ND 84.1 <br />64.3-125 <br />Surrogate: Toluene -d8 48.5 50.0 97.1 83.2-113 <br />Surrogate:4-Bromofluorobenzene 52.1 50.0 104 82.9-116 <br />Surrogate: Dibromofluoromethane 43.8 50.0 87.5 80.4-132 <br />Matrix Spike Dup (24B0253-MSD1) <br />Source: T240742-01 <br />Prepared & Analyzed: 02/14/24 <br />Chlorobenzene <br />41.5 <br />2.5 ug/kg <br />50.0 ND 83.0 <br />65.2-125 <br />9.07 <br />20 <br />1, 1 -Dichloroethene <br />40.8 <br />2.5 <br />50.0 ND 81.6 <br />60.9-131 <br />0.879 <br />20 <br />Trichloroethene <br />42.5 <br />2.5 <br />50.0 ND 84.9 <br />62.1-126 <br />5.43 <br />20 <br />Benzene <br />42.1 <br />2.5 <br />50.0 ND 84.2 <br />65.3-127 <br />5.09 <br />20 <br />Toluene <br />39.9 <br />2.5 <br />50.0 ND 79.7 <br />64.3-125 <br />5.30 <br />20 <br />Surrogate: Toluene -d8 48.4 50.0 96.8 83.2-113 <br />Surrogate:4-Bromofluorobenzene 50.2 50.0 100 82.9-116 <br />Surrogate: Dibromofluoromethane 43.7 50.0 87.5 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 8 of 12 <br />