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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792-1645 <br /> Analytical FAX 792-0342 <br />. www sequoiequaialahs corn <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P407064 <br /> 2870 Gateway Oaks Dave Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/26/04 11 48 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Lunt Units Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P407064-01)Water Sampled 07/01/04 14 22 Received 07/02/04 14 55 <br /> Tert-amyl methyl ether ND 250 ug/l 250 4070265 07/15/04 07/15/04 EPA 8260B <br /> Benzene ND 120 It " " It " <br /> Tert-butyl alcohol ND 5000 " <br /> Di-isopropyl ether ND 250 " <br /> Ethanol ND 25000 " <br /> Ethylbenzene ND 120 " <br /> Ethyl ten-butyl ether ND 250 " <br /> Methyl tert-butyl ether 12000 120 " <br /> Toluene ND 120 " <br /> Xylenes(total) ND 120 " <br /> Surrogate Dibromofluoromethane 116% 84-122 " <br /> Surrogate 1,2-Dichloroelhane-d4 116% 74-135 " <br /> Surrogate Toluene-dS 111 % 84-119 " <br /> urrogate 4-Bromofluorohenzene 103% 86-1194W " <br /> MW-2(P407064-02)Water Sampled 07/01/04 14 52 Received 07/02/04 14 55 <br /> Tert-amyl methyl ether ND 500 ugn 500 4070265 07/15/04 07/15/04 EPA 82608 <br /> Benzene ND 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 " <br /> Ethanol ND 50000 " <br /> Ethylbenzene ND 250 " <br /> Ethyl tert-butyl ether ND 500 " <br /> Methyl Cert-butyl ether 15000 250 " <br /> Toluene ND 250 " <br /> Xylenes(total) ND 250 <br /> Surrogate Dtbromofluoromethane 118% 84-122 " <br /> Surrogate 1,1-Dichloroethane-d4 120% 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 97% 86-119 " <br /> Sequoia Analytical -Petaluma The results m 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 4 of 12 <br />