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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865865 <br /> ��► Analytical FAX(707)792 0342 <br /> www sequoialabs win <br /> • <br /> URS Corp-Sacramento Project Arco Site 6 10 0,Tracy,CA P411134 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 11/07/04 17 30 <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 %R.EC Limits RPD Limit Notes <br /> Batch 4110165- EPA 5030B waters 1 EPA 8260B <br /> Laboratory Control Sample Dup(4110165-BSD1) Prepared&Analyzed 11/05/04 <br /> Benzene 151 016 ppmv 157 96 81-118 6 20 <br /> Benzene 4 83 050 mg/ml Air 5 00 97 81-118 6 20 <br /> Ethylbenzene 116 012 ppmv 115 101 89-122 0 20 <br /> Ethylbenzene 502 0 50 mg/m'Air 500 100 89-122 0 2 20 <br /> Methyl tert-butyl ether 485 0 50 " 5130 97 70-122 4 20 <br /> Methyl tert-butyl ether 135 0 14 ppmv 139 97 70-122 5 20 <br /> Toluene 133 013 133 100 84-119 5 20 <br /> Toluene 501 0 50 mg/m'Air 500 100 84-119 5 20 <br /> Xylenes(total) 346 0 12 ppmv 3 46 100 86-132 09 20 <br /> Xylenes(total) 150 0 50 mg/ml Air 150 100 86-132 0 7 20 <br /> Surrogate Dibromofluoromethane 0 641 ppmv 0 637 101 84-122 <br /> gate DibromoJluoromethane 5 03 mg/m'Air 500 101 84-122 <br /> ogate 12-Dichloroethane-d4 112 ppmv 119 94 74-135 <br /> Surrogate 1 2-Dichloroethane-d4 4 70 mg/m'Air 500 94 74-135 <br /> Surrogate Toluene-d8 129 ppmv 133 97 84-119 <br /> Surrogate Toluene-d8 487 mg/m3 Air 5 00 97 84-119 <br /> uola Analytical- Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody docainient Unless othenvise stated results are reported on a wet weight basis <br /> This analytical report must he reproduced in its entirety <br /> Page 7 of 8 <br />