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885 Jarvis Drive <br /> Sequoia Morgan}i77 95037 <br /> -9600 <br /> (400 8)776-9600 <br /> Analytical FAX equoi labs.c 08 <br /> www.sequoialabs.com <br /> URS Corporation[Arco ll Project: ARCO 40548,Stockton,Ca MNH0053 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: NIP Reported: <br /> ' Sacramento CA,95833 Pmject Manager: Vcrnon P.Elarth 08/06/04 16:20 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> ' Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Balch Prepared Analyzed Method Note <br /> MW-1(MNH0053-01)Water Sampled:08/03/04 08:28 Received: 08/04/04 09:30 <br /> tert-Amyl methyl ether ND 1.0 ug/1 2 4HO6002 08/06/04 08/06/04 EPA 8260B <br /> Benzene ND 1.0 <br /> tert-Butyl alcohol ND 40 <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane ND 1.0 <br /> Ethanol ND 200 " <br /> Ethyl tert-butyl ether ND 1.0 <br /> Ethylbenzene ND 1.0 <br /> Methyl tert-butyl ether 100 1.0 " <br /> ' Toluene ND 1.0 <br /> Xylenes(total) ND 1.0 " <br /> Gasoline Range Organics(C4-C12) 110 100 " <br /> �Surrogate: 1,2-Dichloroethane-d4 99910 78-129 " <br /> MW-2(MNH0053-02)Water Sampled:08/03/04 07:57 Received: 08/04/04 09:30 <br /> tent-Amyl methyl ether ND 0.50 ugll 1 4HO6002 08/06/04 08/06/04 EPA 8260B <br /> ' Benzene ND 0.50 „ <br /> tert-Butyi alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-13ichloroethane ND 0.50 " <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl tert-butyl ether 0.83 0.50 <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate: 1,2-Dichloroethane-d4 85% 78-129 <br /> '1 <br /> 1 <br /> requoia 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 basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 3 of 16 <br />