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a— ) Bl]455 McDowell <br /> vd North Ste <br /> Sequoia P Petaluma CA 94954 <br /> a�>/ (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P EIarth 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW4(P504013-04)Water Sampled 03/30/05 16 55 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 5040103 04/12/05 04/I3/05 EPA 8260B <br /> Benzene ND 050 " <br /> Teri-butyl alcohol 24 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 27 050 " <br /> Toluene ND 050 " ^ <br /> Xylenes(total) ND 050 ~ " <br /> Surrogate Drbromofluoromethane 103% 84-122 <br /> Surrogate 1,2-Drchloroethane-d4 89% 74-135 " <br /> �urrogate Toluene-d8 99% 84-119 „ ,I <br /> Surrogate 4-Bromofluorobenzene 114% 86-119 <br /> MW-5(P504013-05)Water Sampled 03/30/05 11 53 Received 03/31/05 12 45 <br /> Teri-amyl methyl ether ND 1 0 ug/l 1 5040103 04/12/05 04/13/05 EPA 8260B <br /> Benzene ND 050 ^ " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Drbromoethane(EDB) ND 0 50 <br /> 1,2-Drchloroethane ND 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 ^ ^ <br /> Ethyl cert-butyl ether ND 10 <br /> Methyl tent-butyl ether ND 050 ^ <br /> Toluene ND 050 ^ <br /> Xylenes(total) ND 050 ^ <br /> Surrogate Dibromofluoromethane 101% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 90% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 115% 86-119 " <br /> Sequoia 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 mist be reproduced in its entirety <br /> Page 7 of 20 <br />