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a— ) (707) <br /> 1455 McDowell BlumSequoia Petaluma CA 44954North Sie44Analytical FAx 792-1865 <br /> (707)792-0342 <br /> www sequoialabs corn <br /> i <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number-G091Z-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Lunit Units Dilution Batcb Prepared Analyzed Method Note <br /> TB03302005(P504013-12)Water Sampled 03/30/05 12 35 Received 03/31/05 12 45 <br /> Ethanol ND 100 ug/I 1 5040114 04/13/05 04/13/05 EPA 8260B <br /> Surrogate Dibromofluoromethane 91 % 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 90% 74-135 <br /> Surrogate Toluene-d8 93% 84-119 <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 " <br /> a <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> • custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page l 1 of 20 <br />