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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792-1965 <br /> FAX equoi labs c 42 <br /> Analytical <br /> . wwtiv sequo�alabs coni <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <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 /> MW-5(P412205-05)Water Sampled 12/09/04 05 43 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 10 ug/I 10 4120463 12/22/04 12/22/04 EPA 8260B <br /> Benzene ND 50 <br /> Tert-butyl alcohol ND 200 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 50 <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene ND so " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 310 50 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> rrogate 1,2-Dichloroethane-d4 111% 74-135 rr <br /> rrogate Toluene-d8 98% 84-119 <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 <br /> MW-6(P412205-06)Water Sampled 12/09/04 05 21 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 250 ugtl 250 4120414 12/20/04 12/20/04 EPA 82608 <br /> Benzene ND 120 <br /> Tert-butyl alcohol ND 5000 " <br /> Di-isopropyl ether ND 250 " <br /> 1,2-Dibromoethane(EDB) ND 120 <br /> 1,2-Dichloroethane ND 120 " <br /> Ethanol ND 25000 <br /> Ethylbenzene ND 120 " <br /> Ethyl Cert-butyl ether ND 250 " <br /> Methyl tert-butyl ether 7700 120 <br /> Toluene ND 120 <br /> Xylenes(total) ND 120 <br /> Surrogate Dibromofluoromethane 103% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 115% 74-135 <br /> Surrogate Toluene-d8 101 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 105% 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 must be reproduced in its entirety <br /> Page 8 of 21 <br />