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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialahs coin <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/I8/05 1134 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Now <br /> VW-5(P412423-12RE1)Water Sampled 12/21/04 06 40 Received 12/23/04 10 30 CL <br /> 1,2-Diehloroethane 620 25 ugA 50 5010120 01/10/05 01/10/05 EPA 8260E <br /> Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 106% 74-135 j <br /> Surrogate 7oluene-d8 104% 84-119 " <br /> Surrogate 4-Brornofluarobenzene 104% 86-119 <br /> VW-7(P412423-13)Water Sampled 12/20/0413 50 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 1 0 ugll 1 5010012 01/03/05 01/03/05 EPA 826013 <br /> Benzene ND 0 50 " " ^ <br /> Tert-butyl alcohol 100 20 ^ " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Diehloroethane 110 050 E <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 ^ " <br /> �hyl tert-butyl ether ND 10 <br /> ethyl tent-butyl ether 13 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromelhane 95% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 91 % 74-135 " <br /> Surrogate Toluene-d8 105% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 110% 86-119 <br /> VW-7(P412423-13RE1)Water Sampled 12/20/04 13 50 Received 12/23/04 10 30 CL <br /> 1,2-Diehloroethane 210 5 0 ugll 10 5010138 01/11/05 01/11/05 EPA 8260B <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 1,2-Diehloroethane-d4 97% 74-135 " <br /> Surrogate 7oluene-d8 107% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 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 /> Thrs analytical report must be reproduced in its enirrety <br /> Page 12 of 33 <br />