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I i <br /> i <br /> Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 949544 <br /> i (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: ,Arco Site 6100,Tracy,CA P306337 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: W 836619 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/02/03 16:43 <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 3060728-EPA 5030 waters <br /> Matrix Spike Dup(3060728-MSD1) Source:P306337-04 Prepared&Analyzed:06/28/03 <br /> Tert-amyl methyl ether 902 200 ug/l 1000 ND 90 70-116 13 20 1 <br /> E Tert-butyl alcohol 5230 4000 20000 ND 26 62-142 30 20 ' Q-LIM, f <br />€f QR-07 i <br /> f• Di-isopropyl ether 781 200 1000 ND 78 71-121 10 20 <br />! Ethyl cert-butyl ether 796 200 1000 ND 80 71-110 S 20 <br /> i <br /> Methyl tert-butyl ether 1060 100 1000 170 89 77-123 6 20 <br /> Surrogate:DibromoJluoromethane 4.53 5.00 91 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 4.05 5.00 81 74-135 <br /> E' .t Surrogate:Toluene-d8 4.63 5.00 93 84-119 <br /> i <br /> i <br /> f 11 <br /> ij <br /> " I <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 /> i <br /> Page 9 of 10 <br /> I <br />