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1885 Jarvis DriveSequoia <br /> Morgan Hill CA 950375037 <br /> (408)776-9600 <br /> a— )� Analytical FAX(408)782-6308 <br /> www sequotalabs com <br /> URS Corporation[Arco]] Project ARCO#2130,Stockton,CA MOF0835 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/07/05 12 24 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan HUI <br /> Reporting <br /> Analyte Result Lunit Units Dilution Batch Prepared Analyzed Method Not <br /> MS-2B(MOF0835-21)Water Sampled 06/20/0510 15 Received 06/22/05 08 00 <br /> tert-Amyl methyl ether ND 050 ugA 1 5F30006 06/30/05 06/30/05 EPA 8260B <br /> Benzene ND 050 <br /> tent-Butyl alcohol ND 20 <br /> Dl-isopropyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 " ^ <br /> Ethyl tert-butyl ether ND 050 " ^ <br /> Ethylbenzene ND 050 " ^ <br /> Methyl tert-butyl ether ND 050 " ^ <br /> Toluene ND 050 ^ ^ ^ <br /> Xylenes(total) ND 0 50 " ^ <br /> Gasoline Range Organics(C4-C12) ND 50 ^ ^ ^ <br /> Surrogate 11-Dichloroethane-d4 95% 60-135 <br /> MS-3A(MOF0835-22)Water Sampled 06/20/05 12 45 Received 06/22/05 08 00 <br /> krt-Amyt methyl ether ND 050 ug11 1 5F30006 06/30/05 06/30/05 EPA 8260E <br /> nzene 5 1 0 50 " <br /> Cert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 " ^ <br /> 1,2-Dlchloroethane 16 050 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 050 <br /> Ethylbenzene 15 0 50 <br /> Methyl tert-butyl ether 71 050 " ^ <br /> Toluene 0 59 050 ^ ^ <br /> Xylenes(total) 0 85 050 <br /> Gasoline Range Organics(C4-C12) 380 50 <br /> Surrogate 1,1-Dlchloroethane-d4 105% 60-135 ^ <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 13 of 21 <br />