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1455 McDowell Blvd North Ste Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> WWW sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P306156 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/25/03 17 01 <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 Lunit Notes <br /> Batch 3060579-EPA 5030 waters <br /> Matrix Spike Dup(3060579-MSDI) Source P306157-11 Prepared 06/23/03 Analyzed 06/24/03 HT-04 <br /> Teri-amyl methyl ether 472 10 ug/l 500 ND 94 70-116 1 20 <br /> Tert-butyl alcohol 87 2 20 100 ND 87 62-142 4 20 <br /> Di-isopropyl ether 437 10 " 500 ND 87 71-121 5 20 <br /> Ethyl tert butyl ether 424 10 " 500 ND 85 71-110 3 20 <br /> Methyl tent-butyl ether 437 050 11500 036 80 77-123 5 20 <br /> Surrogate Dzbromoflucrornethane 4 79 11500 96 84-122 <br /> Surrogate 12-Drchlorcethane-d4 433 1500 87 74-135 <br /> Surrogate Toluene-d8 487 1500 97 84-119 <br /> i <br /> I <br /> i <br /> 0 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 11 of 12 <br />