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5 <br /> 1455 MCDoweN Blvd North Ste D <br /> 954 <br /> Sequoia Petaluma CA 94 <br /> (707)792-1865865 <br /> FAX(707)792 0342 <br /> I%W Analytical www sequoialahscom <br /> i <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy, CA P411134 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number VVR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 11/07/04 17 30 <br /> Volatile Organic Compounds by EPA Method 826013 - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %KFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4110165- EPA 5030B waters I EPA 8260B <br /> Blank(4110165-BLKI) Prepared&Analyzed 11/05/04 <br /> Benzene ND 016 ppmv <br /> Benzene ND 050 mglm'Air <br /> Ethylbenzene ND 012 ppmv <br /> Ethylbenzene ND 050 mg/ml Air <br /> Methyl tert-butyl ether ND 014 ppmv <br /> Methyl tert-butyl ether ND 050 mg/m'Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 050 mg/ml Air <br /> Xylenes(total) ND 012 ppmv <br /> Xylenes(total) ND 050 mg/m3 Air <br /> Surrogate Dibromofluoromethane 0 598 ppmv 0 637 94 84-122 <br /> 0g.g, <br /> te Dibromofluoromethane 469 mg/mlAir 500 94 84-112 <br /> te 12-Dichloroethane-d4 105 ppmv 119 88 74-135 <br /> Surrogate 1 2-Dichloroethane-d4 442 mg/m'Air 500 88 74-135 <br /> Surrogate Toluene-d8 123 ppmv 133 92 84-119 <br /> Surrogate Toluene-d8 464 mg/m'Atr 500 93 84-119 <br /> Laboratory Control Sample(4110165-BSI) Prepared&Analyzed 11/05/04 <br /> Benzene 4 53 0 50 mg/rn'Air 5 00 91 81-118 <br /> Benzene 142 016 ppmv 157 90 81-118 <br /> Ethylbenzene 501 050 mg/m'Air 5 00 100 89-122 <br /> Ethylbenzene 116 012 ppmv 115 101 89-122 <br /> Methyl tert-butyl ether 465 050 mg/ml Air 5 00 93 70-122 <br /> Methyl tert-butyl ether 129 014 ppmv 1 39 93 70-122 <br /> Toluene 478 050 mg/ml Air 500 96 84-119 <br /> Toluene 127 013 ppmv 133 95 84-119 <br /> Xylenes(total) 343 012 1. 346 99 86-132 <br /> Xylenes(total) 149 050 mg/ml Air l5 0 99 86-132 <br /> Surrogate Dibromofluoromethane 495 115 00 99 84-122 <br /> Surrogate Dibromofluoromethane 0 631 ppmv 0 637 99 84-122 <br /> Surrogate 12-Dichloroethane-d4 468 mglm'Air 500 94 74-135 <br /> Surrogate 12 Dichloroethane-d4 111 ppmv 1 19 93 74-135 <br /> Surrogate Toluene-d8 468 mg/m'Air 500 94 84-119 <br /> Surrogate Toluene-d8 124 ppmv 133 93 84-119 <br /> uoia 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 tivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of 8 <br />