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4DSequoia 885 Jarvis Dr <br /> v4WMorgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> . FAX(408)782.6308 <br /> www.sequoialabs.con <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MMC0044 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported. <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 03/20/03 11:19 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3C11031-EPA 5035 <br /> LaboratoEX Control Sample(XI1031-BSI) Prepared&Analyzed!03/11/03 <br /> Methyl tert-butyl ether 11.1 0.50 ug/l 10.0 111 63-137 0-12 <br /> Benzene 10.8 0.50 10.0 108 78-124 <br /> Toluene 9.15 0.50 10.0 91.5 78-129 <br /> Surrogate:1.2-Dichloroethane-d4 6,21 5.00 124 78-129 <br /> Laboratory Control Sample 3C11031-BS2 Prepared&Analyzed:03/11/03 <br /> Methyl tert-butyl ether 8.72 0.50 ug/i 9.04 96.5 63.137 0-12 <br /> Benzene 5.32 0.50 5,44 <br /> 97.6 78-124 <br /> Toluene 26.8 0.50 32.8 81.7 78-129 <br /> Gasoline Range Organics(C6-C10) 392 50 440 89,1 70-113 <br /> Wrrogate: 1,2-Dichloroethane-d4 5.94 5.00 119 78-129 <br /> Matrix Spike(3C11031-MS1) Source:MMC0034-02REPrepared:03111/03 Analyzed:03/12/03 <br /> Methyl tert-butyl ether 16.9 0.50 UO 9.04 8.0 98.5 0-200 0-12 <br /> Benzene 5.45 0.50 5.44 0.87 84.2 78-124 <br /> Toluene 21.3 0.50 32.8 0.15 64.5 78-129 QM-07 <br /> Gasoline Range Organics(C6-C10) 409 50 440 97 70.9 70-113 <br /> Surrogate: 1,2-Dichloroethane-d4 6.68 5.00 134 78-129 S-LIM <br /> Matrix S ike Du 3C11031-MSDI Source:MMC0034-02REPre ared:03/11/03 Analyzed:03/12/03 <br /> Methyl tent-butyl ether 16.7 0.50 ugll 9.04 &0 96.2 0-200 1.19 200 0-12 <br /> Benzene 4.80 0.50 5.44 0.87 72.2 78-124 12,7 12 QM-07, <br /> QR-07 <br /> Toluene 16.2 0.50 32.8 0.15 48.9 78-129 27.2 10 QM-07, <br /> QR-07 <br /> Gasoline Range Organics(C6-C 10) 316 50 440 97 49,8 70-113 25.7 9 QM-07, <br /> QR-07 <br /> Surrogate: 1,2-Dichloroethane-d4 6.37 5.00 127 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 12 of 13 <br />