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a <br /> 1455 McDowell Blvd, <br /> Sequoia Petaluma,CA Ste,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequosalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drrve Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <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-1 (P31228"1)Water Sampled 12/09/03 02 54 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3120631 12/22/03 12/23/03 EPA 826013 <br /> Benzene ND 050 It " <br /> Tert-butyl alcohol ND 20 " " " <br /> Dr-isopropyl ether ND 1 0 It <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tett-butyl either ND 1 0 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 102% 84-1.22 " <br /> Surrogate 1 2-Dichloroethane-d4 103% 74-13S " <br /> urrogate Toluene-d8 90% 84-119 <br /> arrogate 4-Bromofluorobenzene 96% 86-119 " <br /> MW-2(P312285-02)Water Sampled 12/09/03 03 57 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 3120631 12/22/03 12/23/03 EPA 82608 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane 2 4 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " " <br /> Ethyl tert-butyl ether ND 1 0 " " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 102% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 109% 74-135 " <br /> i <br /> Surrogate Toluene-d8 91 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 98% 86-119 " <br /> Sequoia 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 wei weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 1 I of 35 <br />