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Sequoia <br /> 1455 McDowell Blvd North Ste D <br /> uo�a Petaluma CA 94954 <br /> Se <br /> q (707)792-1865 <br /> Analytical FAX equoi labs c 42 <br /> • www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100 Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number GO9JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/19/05 11 20 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyse Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5050092-EPA 5030B waters/EPA 8260B <br /> Blank(5050092-BLK1) Prepared&Analyzed 05/17/05 <br /> Tert amyl methyl ether ND 024 ppmv <br /> Tert-amyl methyl ether ND 1 0 mg/m'Air <br /> Benzene ND 050 " <br /> Benzene ND 016 ppmv <br /> Tert butyl alcohol ND 66 " <br /> Tert-butyl alcohol ND 20 mg/m'Air <br /> DI-isopropyl ether ND to " <br /> Di-isopropyl ether ND 024 ppmv <br /> Ethylbenzene ND 050 mg/m'Air <br /> Ethylbenzene ND 012 ppmv <br /> Ethyl tert-butyl ether ND 10 mg/ml Air <br /> yl tert-butyl ether ND 024 ppmv <br /> ethyl tert-butyl ether ND 014 " <br /> Methyl Cert-butyl ether ND 050 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 050 mg/ml Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Xylenes(total) ND 050 mg/ml Air <br /> Surrogate Dibromofluoromethane 535 11500 107 84-122 <br /> Surrogate Dibromofluoromethane 0 682 ppmv 0 638 107 84-122 <br /> Surrogate 12-Dichloroethane-d4 140 11119 118 74-135 <br /> Surrogate 1 2-Dichloroethane-d4 589 mg/ml Air 500 118 74-135 <br /> Surrogate Toluene-d8 112 ppmv 122 92 84-119 <br /> Surrogate Toluene-d8 458 mg/m'Air 500 92 84-119 <br /> Laboratory Control Sample(5050092-BSI) Prepared&Analyzed 05/17/05 <br /> Tert-amyl methyl ether 508 1 0 mg/m'Air 500 102 78-117 <br /> Tert-amyl methyl ether 122 024 ppmv 120 102 78-117 <br /> Benzene 441 050 mg/m'Air 5 00 88 81-118 <br /> Benzene 138 016 ppmv 157 88 81-118 <br /> Tert-butyl alcohol 995 20 mg/m'Air 100 100 60-147 <br /> Tert-butyl alcohol 329 66 ppmv 33 1 99 60-147 <br /> Di Isopropyl ether 603 1 0 mg/ml Air 500 121 70-125 <br /> DI-isopropyl ether 145 024 ppmv 120 121 70-125 <br /> Ethylbenzene 4 64 0 50 mg/ml Air 500 93 89-122 <br /> Ethylbenzene 107 012 ppmv l 15 93 89-122 <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 8 of 11 <br />