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1885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> a— ) (408)776-96A0 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs,com <br /> URS Corporation[Arco II 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 I2 24 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Lieut Units Level Result %REC Limns RPD Lumt Notes <br /> Batch 5F29002-EPA 5030B P/T 1 EPA 8260B <br /> Blank(5F29002-BLKI) Prepared&Analyzed 06/29/45 <br /> tett-Amyl methyl ether ND 050 ug/I <br /> Benzene ND 050 " <br /> tert Butyl alcohol ND 20 " <br /> Dmsopropyl ether ND 0 50 <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 IC <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 050 <br /> Methyl tett-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> I <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> arrogate 1,1-Dichloroethane-d4 208 2.50 83 60-135 <br /> Blank(5F29002-BLK2) Prepared&Analyzed 06/29/05 <br /> tert-Amyl methyl ether ND 050 ugfl <br /> Benzene ND 050 <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> I <br /> Ethyl tort-butyl ether ND 050 <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4 C 12) ND 50 " <br /> I <br /> Surrogate 12-Dichloroethane-d4 207 2 50 83 60-135 <br /> I <br /> I <br /> I <br /> I <br /> I <br /> Sequoia Analytical-Morgan Hill 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 baso <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 21 <br />