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i <br /> L <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 15) (707)792-1865 <br /> Analytical <br /> '4, FAX 792 0 <br /> 342 <br /> www sequoiquoialabs corn <br /> 0 <br /> URS Corp-Sacramento Protect Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36619 [reported <br /> Sacramento CA,95833 Protect Manager Jay Johnson 09/21/04 09 47 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Llmlt Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-2(P409117-01)Water Sampled 09/07/04 04 43 Received 09/07/04 16 55 <br /> Tert-amyl methyl ether ND 1 0 ugll 1 4090417 09/16/04 09/17/04 EPA 8260B <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tcrt-butyl ether ND l 0 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluoromethane 98% 84-121 <br /> *ogate 1,2-Dichloroethane-d4 97% 74-135 <br /> ogate Toluene-d8 98% 84-119 <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 <br /> MW-10(P409117-02)Water Sampled 09/07/04 05 20 Received 09/07/04 16 55 <br /> Tert-amyl methyl ether ND 200 ug/l 200 4090417 09/16/04 09/17/04 EPA 8260E <br /> Benzene 4600 100 " <br /> Tert-butyl alcohol ND 4000 <br /> Di-isopropyl ether ND 200 <br /> 1,2-Dtbromoethane(EDB) ND 100 <br /> 1,2-Dtchloroethane ND 100 " <br /> Ethanol ND 20000 " <br /> Ethylbenzene 530 t00 <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether ND 100 " <br /> Toluene 5000 100 <br /> Xylenes(total) 9400 100 <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 94% 74-135 " , <br /> Surrogate Toluene-d8 97% 84-119 <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 " " <br /> nota 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 15 <br />