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1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> a— ) <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> 40 <br /> URS Com-Sacramento Project BP Heritage Site 11194,Tracy,Ca P310692 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/14/03 15 55 <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 /> MW-3(P310692-08RE1)Water Sampled 10/29/03 12 50 Received 10/31/03 10 30 <br /> Tert-butyl alcohol 300 100 ug/I 5 3110233 11112/03 1]/12/03 EPA 826013 <br /> Surrogate Dibromofluoromethane 105% 84-1.22 " <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 " <br /> Surrogate Toluene-d8 114% 84-119 " <br /> AMW-5(P310692-09)Water Sampled 10/29/03 14 55 Received 10/31/03 10 30 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3110188 11/11/03 11/11/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol 120 20 " <br /> Di-isopropyl ether ND 10 ° <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Oethyl tent-butyl ether 47 050 <br /> .luene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate DibromoJluoromethane 105% 84-112 " <br /> Surrogate 1,2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 114% 84-119 " <br /> MW-5(1"310692-10)Water Sampled 10/29/03 13 25 Received 10/31/03 10 30 <br /> Tert-amyl methyl ether ND 10 ugtl 1 3110188 11/11/03 11/11/03 EPA 8260B <br /> Benzene 077 050 " <br /> Ter[-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 18 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 103% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 " <br /> Surrogate Toluene-d8 115% 84-119 " <br /> �equoia 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 /> basis This analytrcal report must be reproduced in its entirety <br /> Page 9 of 22 <br />