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i <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ''j <br /> D4 <br /> v (707)792-1865 <br /> NWAnalytical tjC'dl FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P312071 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/22/03 13 18 <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 3120274-EPA 5030B waters <br /> Laboratory Control Sample(3120274-BS1) Prepared&Analyzed 12/10/03 <br /> Surrogate Di bromofluorom ethane 4 78 ug/1 450 106 84-122 <br /> Surrogate 1 2-Dichforoethane-d4 460 450 101 74-135 <br /> Surrogate Toluene-d8 503 450 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 514 450 114 86-119 <br /> Laboratory Control Sample Du (3120274-BSDI) Prepared&Analyzed 12/10/03 <br /> Methyl tert-butyl ether 462 0 50 ug/l Soo 92 77-123 5 20 <br /> Surrogate Drbromofluoromethane 486 450 108 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 469 450 104 74-135 <br /> Surrogate Toluene-d8 5 10 450 113 84-119 <br /> Surrogate 4-Bromoffuorobenzene 508 450 113 86-119 <br /> • <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> • of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced to its entirety <br /> Page 16 of 17 <br />