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sDr <br /> 8Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600Arial <br /> Analytical FAX <br /> (408)782-6308 <br /> www.scauoialabs.con <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MMB0444 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 03/14/03 16:22 <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 RPB Limit Notes <br /> Batch 3B27007-EPA 5035 <br /> Blank(3B27007-B_LK1)_ _ Prepared&Analyzed:02/27/03 <br /> Ethylbenzene ND 0.50 ug/l <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C6-C10) ND 50 " <br /> Surrogate: 1,2-Dichloroethane-d4 5.88 5.00 118 78-129 <br /> Laboratory Control Sample(3B27007-BS1) Prepared&Analyzed:02/27/03 <br /> Methyl tort-butyl ether 10.2 0.50 um 10.0 102 63-137 <br /> Benzene 10.4 0.50 10.0 104 78-124 <br /> Toluene 9.29 0.50 10.0 92.9 78-129 <br /> .Surrogate: 1,2-Dichloroethane-d4 5.49 5.00 110 78-129 <br /> Laboratory Control Sample(3B27007-BS2) Prepared&Analyzed:02/27/03 <br /> Methyl tert-butyl ether 7.57 0.50 ugll 9.04 83,7 63-137 ^ <br /> Benzene 5.14 0.50 5.44 94.5 78-124 <br /> Toluene 27.8 0.50 32.8 84.8 78-129 <br /> Gasoline Range Organics(C6-C 10) 397 50 440 90.2 70-113 <br /> Surrogate: l,2-Dichloroethane-d4 5.28 oo5.00 106 78-129 <br /> Laboratory Control Sample Dup(3B27007-BSD1) Prepared&Analyzed:02/27/03 <br /> Methyl tert-butyl ether 8.75 0.50 ug/l 10.0 87.5 63-137 15.3 13 QR-02 <br /> Benzene 9.75 0.50 10.0 97.5 78-124 6.45 12 <br /> Toluene 9.23 0.50 10.0 92.3 78-129 0.648 10 <br /> Surrogate: l,2-Dichloroethane-d4 4.67 5.00 93.4 78-129 <br /> _ <br /> Laboratory Control Sample Dup(3B27007-BSD2) Prepared&Analyzed:02/27/03 <br /> Methyl tort-butyl ether 8.61 0.50 ug/1 9.04 95.2 63-137 129 13 <br /> Benzene 5.28 0.50 5.44 97,1 78-124 2.69 12 <br /> Toluene 28.5 0.50 32.8 86,9 78-129 2.49 10 <br /> Gasoline Range Organics(C6-C10) 431 50 440 98.0 70-113 8.21 9 <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 /> 21 of 28 <br />