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`+ Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> a— ) (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Pr4lect Number Intnm-50293 Reported <br /> Sacramento CA,95833 Pr41ect Manager Vernon P Elarth 01/07/04 16 58 <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 /> MS-1A(P312285-20)Water Sampled 12/10/03 07 18 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 USA 1 3120709 12/24/03 12/24/03 EPA 8260B <br /> Benzene 16 050 <br /> Tert-butyl alcohol ND 20 " ^ <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichloroethane 097 050 <br /> Ethanol ND 100 <br /> Ethylbenzene 3 7 050 ^ ^ <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether 058 050 <br /> Toluene 18 050 <br /> Xylenes(total) 24 050 <br /> Surrogate Dibromofluoromethane 105% 84-122 <br /> Surrogate 12-Dichloroethane-d4 112% 74-135 <br /> urrogate Toluene-d8 101% 84-119 <br /> urrogate 4-BromoJluorobenzene 103% 86-119 " <br /> MS-1B(P312285-21)Water Sampled 12/10/03 07 33 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3120709 12/24/03 12/24/03 EPA 8260E <br /> Benzene 14 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichloroethane 096 050 " ^ <br /> Ethanol ND 100 <br /> Ethylbenzene 31 050 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 057 050 <br /> Toluene 15 050 <br /> Xylenes(total) 20 050 <br /> Surrogate DibromoJluoromethane 105% 84-122 " ^ <br /> Surrogate 1,2-Dichloroethane-d4 108% 74-135 " ^ <br /> i <br /> Surrogate Toluene-d8 98% 84-119 <br /> Surrogate 4-Bromofluorobenzene 98% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed on accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> bases This analytical report must be reproduced in its entirety <br /> Page 20 of 35 <br /> I <br />