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1455McDowell Blvd,North Ste D <br /> 4D Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> • <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project plumber Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source "/oREC RPD <br /> Analyte Result Limit Units Level Result °/.REC Limits RPD Limit Notes <br /> Batch 4110669-EPA 5030B waters/EPA 8260E <br /> Laboratory Control Sample Dap(4110669-BSD1) Prepared 11/26/04 Analyzed 11/27/04 VQT <br /> Tert-amyl methyl ether 530 10 ugll 500 106 78-117 3 20 <br /> Benzene 5 19 050 " 500 104 81-118 3 20 <br /> Tert-butyl alcohol 108 20 100 108 60-147 4 20 <br /> Di-isopropyl ether 5 13 10 Soo 103 70-125 1 20 <br /> 1,2-Dibromoethane(EDB) 537 050 500 107 85-125 9 20 <br /> 1,2-Dichloroethane 537 050 Soo 107 77-126 1 20 <br /> Ethanol 145 100 100 145 55-200 39 20 BA <br /> Ethylbenzcne 526 050 500 105 89-122 4 20 <br /> Ethyl tert-butyl ether 525 10 500 105 71-120 02 20 <br /> Methyl tert-butyl ether 497 050 500 99 70-122 08 20 <br /> Toluene 524 050 " 500 105 84-119 1 20 <br /> Xylenes(total) 158 050 150 105 86-132 6 20 <br /> arrogate Dibromolluoromethane 595 500 119 84-112 <br /> Surrogate 1,2-Dichloroethane-d4 588 Soo 118 74-135 <br /> Surrogate Toluene-d8 593 500 119 84-119 <br /> Surrogate 4-Bromofluorobenzene 600 500 120 86-119 LH <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 18 of 19 <br />