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1455 McDowell Blvd North Ste D <br /> (DFAXSequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> � ww� Analytical wwseq 7)7920342 <br /> www com <br /> i <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P410118 <br /> Reported <br /> 2870 Gateway Oaks Drive Suite 300 Project Number R36619 <br /> W <br /> Sacramento CA,95833 Project Manager Jay Johnson 1011 I/U4 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 mglm'Air 100 83 55-200 <br /> Ethanol 440 53 ppmv 53 2 83 55-200 <br /> Ethylbenzene 529 050 mg/ml Air 5 00 106 89-122 <br /> Ethylbenzene 122 012 ppmv 1 15 106 89-122 <br /> Ethyl tert-butyl ether 526 1 0 mg/ml Air 5 00 105 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/m'Air 5 00 102 70-122 <br /> Methyl tert-butyl ether 1 42 014 ppmv 1 39 102 70-122 <br /> Toluene 586 050 mglm'Air 5 00 117 84-119 <br /> Toluene 156 013 ppmv 133 117 84-119 <br /> Xylenes(total) 3 80 012 346 110 86-132 <br /> s(total) 165 050 mg/m'Air 15 0 110 86-132 <br /> ogate Dibromofluoromethane 458 11 500 92 84-122 <br /> Surrogate Dtbromofluoromethane 0 584 ppmv 0 637 92 84-122 - <br /> Surrogate 12-Dichloroethane-d4 490 mg/m3 Air 500 98 74-135 <br /> Surrogate I2-Dichloroethane-d4 116 ppmv 119 97 74-135 <br /> Surrogate Toluene-d8 528 mg/m'Air .500 106 84-119 <br /> Surrogate Toluene-d8 1 40 ppniv 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 1 20 102 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 523 050 mg/ml Air 5 00 105 81-118 7 20 <br /> Tert-butyl alcohol 302 6 6 ppmv 33 1 91 60-147 0 7 20 <br /> Tert-butyl alcohol 915 20 mg/ml Air 100 92 60-147 0 5 20 <br /> Di-isopropyl ether 5 22 1 0 1. 5 00 104 70-125 4 20 <br /> Di-isopropyl ether 1 25 024 ppmv 1 20 104 70-125 5 20 <br /> Ethanol 473 53 1. 53 2 89 55-200 7 20 <br /> Ethanol 889 100 mg/ml Air 100 89 55-200 7 20 <br /> Ethylbenzene 5 08 0 50 5 00 102 89-122 4 20 <br /> Ethylbenzene 117 012 ppmv 115 102 89-122 4 20 <br /> Ethvl tert-butyl ether 4 97 1 0 mg/m'Air 5 00 99 71-120 6 20 <br /> Ethyl tert-butyl ether 1 19 024 ppmv 1 20 99 71-120 6 20 <br /> Methyl tert-butyl ether 482 050 mg/m'Air 500 96 70-122 6 20 <br /> Methyl tert-butyl ether 1 34 0 14 ppmv 1 39 96 70-122 6 20 <br /> The results in this report apply to the samples analyzed in accordance with the chain of <br /> oto Analytical-Petaluma <br /> custody document Unless othenvise stated results are reported on a ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 9 <br />