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1455 McDowell Blvd,North Ste D <br /> D— Sequoia Petaluma,CA 94954 <br /> ' 1865 <br /> Analytical (707707;792 792 0334242 <br /> FAX <br /> www sequoialabs com <br /> URS Corp-Sacramento Protect Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 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 /> ATR-7(P309407-07)Water Sampled 09/18/03 I0 40 Received 09/19/03 15 25 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3100050 10/02/03 10/02/03 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <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 Dibromofluoromethane 102% 84-122 " <br /> Surrogate 12-Drchloroethane-d4 113% 74-135 " <br /> Surrogate Toluene-d8 95% 84-119 " <br /> ATR-8(P309407-08)Water Sampled 09/18/03 15 00 Received 09/19/03 15 25 <br /> ert-amyl methyl ether ND 10 ug/l 1 3100050 10/02/03 10/02/03 EPA 8260B <br /> Benzene 058 0 50 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 050 050 <br /> Ethyl ter[-butyl ether ND 10 <br /> Methyl tert-butyl ether 2 3 0 50 <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluorom ethane 102% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 " <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 slated results are reported on a wet weight basis <br /> . <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 16 <br />