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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> FAX w� Analytical wwseq(707)792-0342 <br /> om <br /> www sequoralabs com <br /> URS Corp-Sacramento Project Arco Site 6100,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 %REC Limits RPD Limit Notes <br /> Batch 4110165- EPA 5030B waters/EPA 8260B <br /> Blank(4110165-BLK1) Prepared&Analyzed 11/05/04 <br /> Benzene ND 016 ppmv <br /> Benzene ND 050 mg/m'Air <br /> Ethyibenzene ND 012 ppmv <br /> Ethylbenzene ND 050 mg/m'Air <br /> Methyl tert-butyl ether ND 014 ppmv <br /> Methyl tert-butyl ether ND 050 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 0 50 mglm'Air <br /> Xylenes(total) ND 012 ppmv <br /> Xylenes(total) ND 0 50 mg/ml Air <br /> Surrogate Dibromofluoromethane 0 598 ppmv 0 637 94 84-122 <br /> gate Dibromofluoromethane 469 mg/m'Air 500 94 84-122 <br /> agate 1,2-Drchloroethane-d4 105 ppmv 119 88 74-135 <br /> Surrogate 1 2-Drchloroethane-d4 442 mg/ml.4ir 5 00 88 74-135 <br /> Surrogate Toluene-d8 123 ppmv 133 92 84-119 <br /> Surrogate Toluene-d8 464 mg/m'Arr 500 93 84-119 <br /> Laboratory Control Sample(4110165-BS1) Prepared&Analyzed 11/05/04 <br /> Benzene 4 53 050 mg/ml Air 5 00 91 81-118 <br /> Benzene 142 016 ppmv 157 90 81-118 <br /> Ethylbenzene 5 01 0 50 mg/ml Air 500 100 89-122 <br /> Ethylbenzene 116 Olt ppmv 115 101 89-122 <br /> Methyl tert-butyl ether 4 65 050 mg/m'Air 500 93 70-122 <br /> Methyl tert-butyl ether 129 0 14 ppmv 139 93 70-122 <br /> Toluene 4 78 050 mglm'Air 500 96 84-119 <br /> Toluene 127 013 ppmv 133 95 84-119 <br /> Xylenes(total) 343 0 12 11 346 99 86-132 <br /> Xylenes(total) 14 9 0 50 mg/m'Air 15 0 99 86-132 <br /> Surrogate Dibromofluoromethane 49S 11500 99 84-122 <br /> Surrogate Dibromofluoromethane 0 631 ppmv 0 637 99 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 4 68 mg/m'Arr 5 00 94 74-135 <br /> Surrogate 12-Drchloroethane-d4 111 ppmv 119 93 74-135 <br /> Surrogate Toluene-d8 4 68 mg/m,Arr Soo 94 84-119 <br /> Surrogate Toluene-d8 124 ppmv 133 93 84-119 <br /> 0uota 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 6 of 8 <br />