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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical <br /> (707)792 1865 <br /> FAX(707)792 0342 <br /> • www sequaialahs coin <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P403322 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrun-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/27/04 16 33 <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-9(P403322-01)Water Sampled 03/11/04 13 50 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/t 1 4030678 03/24/04 03/24/04 EPA 8260B <br /> Surrogate Dibromofluoromethane 116% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 138% 74-135 Sol <br /> Surrogate Toluene-d8 93% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 " <br /> MW-10(P403322-02)Water Sampled 03/11/04 13 40 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/l 1 4030678 03/24/04 03/24/04 EPA 82608 <br /> Surrogate Dibromofluoromethane 134% 84-122 S01 <br /> Surrogate 12-Dichloroethane-d4 154% 74-135 S01 <br /> Surrogate Toluene-d8 97% 84-119 <br /> Surrogate 4-Bromofluorobenzene 103% 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 3 of 6 <br />