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1455 McDowell Blvd,North Ste 17 <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> iqWAnalytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> [Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> VW-3(P412423-10)Water Sampled 12/20/04 13 38 Recelived 12/23/04 10 30 <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 5010012 01103105 01103105 EPA 8260B <br /> VW4(P412423-11)Water Sampled 12/20/04 13 10 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 10 ug/[ 1 5010012 01/03/05 01/03/05 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane 5 6 050 " <br /> Ethanol ND 100 " <br /> Ethyibenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tt,rt-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> 0SSurrogate Dibromofluoromethane 94% 84-111 <br /> urrogate 1 2-Dichloroethane-d4 91 % 74-135 " <br /> Surrogate Toluene-d8 105% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 " <br /> VW-5(P412423-12)Water Sampled 12/21/04 06 40 Received 12123/04 10 30 <br /> Tert-amyl methyl ether ND 5 0 ugll 5 5010022 01/04/05 01/04105 EPA 8260B <br /> Benzene ND 2 5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dichloroethane 430 2 5 " E <br /> Ethanol ND 500 <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tort-butyl ether 3 8 2 5 " <br /> Toluene ND 2 5 <br /> Xylenes(total) ND 2 5 11 " <br /> .Surrogate Dibromofluoromethane 93% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 90% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 " <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 /> 10 This analytical report must be reproduced in its entirety <br /> Page 11 of 33 <br />