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a <br /> I <br /> a— ) (7Sequoia 1455 McDowell Blvd,North Ste D <br /> 07)Petaluma,CA 94954 <br /> 792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> I <br /> I <br /> URS Corn-Sacramento Protect Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 01/07/04 1658 <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 /> VW-I1 (P312285-18)Water Sampled 12/10/03 04 09 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 u8A 1 3120702 12/24/03 12/24/03 EPA 82608 <br /> Benzene 13 050 " " " " " <br /> Tert-butyl alcohol 34 20 IF IF <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichloroethane 23 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene 21 050 <br /> Ethyl tert-butyl ether ND 10 IF IF <br /> Methyl tert-butyl ether 12 050 " " <br /> Toluene ND 050 IF " <br /> Xylenes(total) 13 050 ^ IF <br /> Surrogate Dibromofluoromethane 112% 84-122 IF " IF <br /> Surrogate 1,2-Dichloroethane-d4 106% 74-135 <br /> jKurrogate Toluene-d8 102% 84-119 ;i I' II <br /> urrogate 4-BromoJluorobenzene 106% 86-119 <br /> VW-12(P312285-19)Water Sampled 12/10/03 05 30 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 50 ug/l 5 3120709 12/24/03 12/24/03 EPA 8260B <br /> Benzene ND 25 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 50 IF " <br /> 1,2-Dichloroethane 150 25 IF <br /> Ethanol ND 500 IF <br /> Ethylbenzene ND 25 <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl tert-butyl ether 95 25 " <br /> Toluene ND 25 <br /> Xylenes(total) ND 25 <br /> Surrogate Dtbromofluoromethane 105% 84-122 IF <br /> IF IF <br /> Surrogate 12-Dichloroethane-d4 III % 74-135 ^ " <br /> Surrogate Toluene-d8 101% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 19 of 35 <br />