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1455 McDowell Blvd North Ste D <br /> _ <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P411271 <br /> 2870 Gateway Oaks Drive Suite 300 <br /> Project Number VVR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 11/I5/04 13 28 <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 4110355- EPA 5030B waters/EPA 8260E <br /> Blank(4110355-BLKI) Prepared&Analyzed 11/12/04 <br /> Tert-amyl methyl ether ND 024 ppmv <br /> Tert-amyl methyl ether ND 10 mg/ml Air <br /> Benzene ND 050 " <br /> Benzene ND 016 ppmv <br /> Tert-butyl alcohol ND 6 6 1. <br /> Tert-butyl alcohol ND 20 mg/ml Air <br /> Di-isopropyl ether ND 024 ppmv <br /> Di-isopropyl ether ND 10 mg/m'Air <br /> Ethanol ND 53 ppmv <br /> Ethanol ND 100 mg/m'Air <br /> Ethylbenzene ND 012 ppmv <br /> benzene ND 050 mg/ml Air <br /> tert-butyl ether ND 024 ppmv <br /> Ethyl tert-butyl ether ND 10 mg/ml Air <br /> Methyl tert-butyl ether ND 0 14 ppmv <br /> Methyl tert-butyl ether ND 050 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 0 50 mg/ml Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Xylenes(total) ND 050 mg/ml Air <br /> Surrogate Dtbromofluoromethane 0 696 ppmv 0 637 109 84-122 <br /> Surrogate Dtbromofluoromethane 546 mg/m'Air 5 00 109 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 566 11500 113 74-135 <br /> Surrogate 12-Drchloroethane-d4 135 ppmv 119 113 74-135 <br /> Surrogate Toluene-d8 135 11133 102 84-119 <br /> Surrogate Toluene-d8 509 mglm'Azr 5 00 102 84-119 <br /> Laboratory Control Sample(4110355-BS1) Prepared&Analyzed 11/12/04 <br /> Tert-amyl methyl ether 524 1 0 mg/ml Air 5 00 105 78-117 <br /> Tert-amyl methyl ether 126 024 ppmv 120 105 78-117 <br /> Benzene 5 15 050 mg/m'Air 500 103 81-118 <br /> Benzene 161 016 ppmv 157 103 81-118 <br /> Tert-butyl alcohol 102 20 mg/m'Air 100 102 60-147 <br /> Tert-butyl alcohol 338 6 6 ppmv 33 1 102 60-147 <br /> Di-isopropyl ether 5 54 10 mg/ml Air 500 111 70-t25 <br /> Di-isopropyl ether 1 33 024 ppmv 120 111 70-125 <br /> uola 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 7 of 10 <br />