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1455 McDowell North Ste <br /> ` Sequoia Petaluma CA 949$44 <br /> (707)792-1865 <br /> �► <br /> FAX <br /> Analytical <br /> • www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P3I2396 <br /> 2870 Gateway pales Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/09/04 18 12 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed - Method Notes <br /> MW-I(P312396-01)Water Sampled 12/11/03 04 45 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND 50 ugA 50 3120714 12/25/03 12/25/03 EPA 8260E <br /> Benzene 970 25 <br /> Tert-butyl alcohol ND 1000 <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 5000 " <br /> Ethylbenzene 1000 25 <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl tert-butyl ether 3200 25 <br /> Toluene 860 25 <br /> Xylenes(total) 3900 25 <br /> Surrogate Dibromofluoromethane 101% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 104% 74-135 " <br /> rrogate Toluene-d8 96% 84-119 " <br /> i <br /> rrogate 4-Bromofluorobenzene 106% 86-119 <br /> I <br /> MW-1 (P312396-01REI)Water Sampled 12/11103 04 45 Received 12/12/03 08 20 HT-04 <br /> Methyl tert-butyl ether 2900 50 ugli 100 3120719 12/27/03 12/27/03 EPA 8200B <br /> Surrogate Dibromofluoromethane 96% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 <br /> MW-2(P312396-02)Water Sampled 12/11/03 06 10 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3120714 12/25/03 12/25/03 EPA 8260E <br /> Benzene 085 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Fthyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 057 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 064 050 <br /> Surrogate Dibromofluoromethane 103% 84-122 <br /> Surrogate 12-Dichloroethane-d4 102% 74-135 <br /> Surrogate Toluen248 92% 84-119 " <br /> �equola 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 /> This analytical report must be reproduced in its entirety <br /> Page 5 of 17 <br />