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1455 McDowell Hlvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> � (707)792-1865 <br /> Analytical FAX 792 0342 <br /> www sequoiequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P410118 <br /> Project Number WR36619 Reported <br /> 2870 Gateway Oaks Drive Suite 300 Pro J <br /> Sacramento CA,95833 Project Manager Jay Johnson 10/11/04 15 36 <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 4100135- EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample(4100135-BSI) Prepared&Analyzed 10/07/04 <br /> Ethanol 827 100 mg/ml Air l00 83 55-200 <br /> Ethanol 440 53 ppmv 532 83 55-200 <br /> Ethylbenzene 529 0 50 mg/ml Au 5 00 106 89-122 <br /> Ethylbenzene 122 012 ppmv 115 106 89-122 <br /> Ethyl tert-butyl ether 526 1 0 mg/ml Air 500 105 71-120 <br /> Ethyl tert-butyl ether 1 26 024 ppmv 1 20 105 71-120 <br /> Methyl tert-butyl ether 5 12 050 mg/ml Air 5 00 102 70-122 <br /> Methyl tert-butyl ether 142 014 ppmv 1 39 102 70-122 <br /> Toluene 5 86 050 mg/ml Air Soo 117 84-119 <br /> Toluene 156 013 ppmv 133 117 84-119 <br /> Xylenes(total) 3 80 012 113 46 110 86-132 <br /> es(total) 165 050 mg/ml Air 150 110 86-132 <br /> agate Dibromofluoromethane 458 500 92 84-122 <br /> Surrogate Dihmmofluoromethane 0 584 ppmv 0 637 92 84-122 <br /> Surrogate 12-Drchloroelhane-d4 490 mg/m'Rrr 300 98 74-135 <br /> Surrogate 12-Dichloroethane-d4 116 ppmv 119 97 74-135 <br /> Surrogate Toluene-d8 528 mg/m'Rrr 5 00 106 84-119 <br /> Surrogate Toluene-d8 140 ppmv 133 105 84-119 <br /> Laboratory Control Sample Dup(4100135-BSD1) Prepared&Analyzed 10/07/04 <br /> Tert-amyl methyl ether 1 23 024 ppmv 120 102 78-117 9 20 <br /> Tert-amyl methyl ether 5 12 1 0 mg/ml Air 500 102 78-117 10 20 <br /> Benzene 164 016 ppmv 157 104 81-118 6 20 <br /> Benzene 5 23 050 mg/ml Air 500 105 81-118 7 20 <br /> Tert-butyl alcohol 302 6 6 ppmv 33 1 91 60-147 0 7 20 <br /> Tert-butyl alcohol 91 5 20 mg/ml Air 100 92 60-147 0 5 20 <br /> Di-isopropyl ether 522 l 0 115 00 104 70-125 4 20 <br /> Di-isopropyl ether 125 024 ppmv 1 20 104 70-125 5 20 <br /> Ethanol 473 53 53 2 89 55-200 7 20 <br /> Ethanol 88 9 100 mg/ml Air 100 89 55-200 7 20 <br /> Ethylbenzene 508 050 11500 102 89-122 4 20 <br /> Ethylbenzene 117 012 ppmv 1 15 102 89-122 4 20 <br /> Ethyl tert-butyl ether 497 1 0 mg/ml Air 500 99 71-120 6 20 <br /> Ethyl tent-butyl ether 119 0 24 ppmv 120 99 71-120 6 20 <br /> Methyl cert-butyl ether 482 0 50 mglm'Air 5 00 96 70-122 6 20 <br /> Methyl tert-butyl ether 1 34 0 14 ppmv 139 96 70-122 6 20 <br /> nota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 9 <br />