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1455 McDowell Blvd,North Ste D <br /> SequoIa Petaluma,CA 94954 <br /> 4D (707)792 1665 <br /> Analytical FAX(707)7920342 <br /> www sequoialabs com <br /> i <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Protect 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 /> Malyte Result Limit Units Dilution Batch Prepared Analyzed Method Now <br /> VW-8(P412423-14)Water Sampled 12/21/04 06 30 Received 12/23/04 10 30 <br /> i <br /> Tert-amyl methyl ether ND 10 ugll 10 5010022 01/04/05 01/04/05 EPA 8260E <br /> Benzene 390 5 0 E <br /> Tert-butyl alcohol ND 200 ^ <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 50 5 0 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene 440 5 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 5 0 <br /> Toluene 64 5 0 " <br /> Xylenes(total) 450 5 0 " <br /> .Surrogate Dibromofluoromethane 93% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 89% 74-135 " <br /> I <br /> Surrogate Toluene-d8 106% 84-119 " <br /> 0urrogate 4-Bromofluorobenzene 106% 86-119 " <br /> VW-8(P412423-14RE1)Water Sampled 12/21/04 06 30 Received 12/23/04 10 30 BU <br /> Benzene 1200 12 ug/I 25 5010108 01/09/05 01/09/05 EPA 8260B <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 104% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 100% 86-119 " <br /> VW-10(P412423-15)Water Sampled 12/21/04 07 15 Received 12/23/04 10 30 VQT <br /> Tert-amyl methyl ether ND 5 0 ug/l 5 5010022 01/04/05 01/04/05 EPA 8260E <br /> Benzene 310 25 E <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Drchloroethane ND 25 <br /> Ethanol ND 500 <br /> Ethylbenzene 520 2 5 ^ E <br /> Ethyl tent-butyl ether ND 5 0 <br /> Methyl Cert-butyl ether ND 2 5 " <br /> i <br /> Toluene 400 2 5 E <br /> Xylenes(total) 980 2 5 " E <br /> Surrogate Dibromofluoromethane 93% 84-122 ^ <br /> Surrogate 12-Dichloroethane-d4 89% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <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 /> 40 This analytical report must be reproduced in its entirety <br /> Page 13 of 33 <br />