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Sequoia E455 McDowell Blvd North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)742-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3100050-EPA 5030 waters <br /> Laboratory Control Sample Dup(3100050-BSD1) Prepared&Analyzed 10/02/03 <br /> Tert-amyl methyl ether 512 10 ugll 500 102 70-116 5 20 <br /> Benzene 4 81 050 500 96 81-118 06 20 <br /> Tert-butyl alcohol 993 20 too 99 62-142 25 20 QR-02 <br /> Di-isopropyl ether 4 52 10 500 90 71-121 12 20 <br /> Ethanol 115 100 too 115 65-135 20 20 <br /> Ethylbenzene 507 050 500 101 89-122 5 20 <br /> Ethyl tert-butyl ether 453 10 500 91 71-110 t0 20 <br /> Methyl tert-butyl ether 500 050 500 100 77-123 12 20 <br /> Toluene 5 31 050 500 106 84-119 6 20 <br /> Xylenes(total) 156 050 15 0 104 86-132 6 20 <br /> Surrogate Dibromofluoromethane 504 500 101 84-112 <br /> WSurrogate 12-Dichloroethane-d4 515 Soo 103 74-135 <br /> .rrogate Toluene-d8 505 500 101 84-119 <br /> Batch 3100060-EPA 5030 waters <br /> Blank(3100060-BLK1) Prepared&Analyzed 10/02/03 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 548 600 91 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 93 600 82 74-135 <br /> Surrogate Toluene-d8 618 600 103 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 14 of 16 <br />