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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> a)- <br /> 0 qW <br /> Analytical wwscq 7talabs om <br /> w+vw sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/19/05 11 20 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC R-PD <br /> Analyte Result Limit Units Level Result %uREC Limits RPD Limit Notes <br /> Batch 5050092-EPA 5030B waters 1 EPA 82608 <br /> Laboratory Control Sample(5050092-BS1) Prepared&Analyzed 05/17/05 <br /> Ethyl tert-butyl ether 5 30 10 mg/ml Air 500 106 71-120 <br /> Ethyl tert-butyl ether 127 024 ppmv 120 106 71-120 <br /> Methyl tert-butyl ether 571 050 mg/m'Air 500 114 70-122 <br /> Methyl tert-butyl ether l 59 014 ppmv 1 39 114 70 122 <br /> Toluene 467 050 mg/ml Air 500 93 84-119 <br /> Toluene 124 013 ppmv 133 93 84-119 <br /> Xylenes(total) 328 0 12 346 95 86-132 <br /> Xylenes(total) 142 050 mg/m'Air 150 95 86-132 <br /> Surrogate Dtbromofluoromethane 602 11500 120 84-122 <br /> Surrogate Dibromofluoromethane 0 767 ppmv 0 638 120 84-122 <br /> 0uurrogate 12-Dichloroethane-d4 677 mg/m'Air 5 00 135 74-135 <br /> rrogate 12-Dichloroethane-d4 161 ppmv 119 135 74-135 <br /> rrogate Toluene-d8 4 83 mg/m'Arr 5 00 97 84-119 <br /> Surrogate Toluene-d8 118 ppmv 122 97 84-119 <br /> Laboratory Control Sample Dup(5050092-BSD]) Prepared&Analyzed 05/17/05 <br /> Tert-amyl methyl ether 1 13 024 ppmv 120 94 78-117 8 20 <br /> Tert-amyl methyl ether 4 72 10 mg/ml Air 500 94 78 117 7 20 <br /> Benzene 136 016 ppmv 157 87 81-118 1 20 <br /> Benzene 435 0 50 mg/ml Air 500 87 81-118 1 20 <br /> Tert-butyl alcohol 33 8 6 6 ppmv 33 1 102 60-147 3 20 <br /> Tert-butyl alcohol 102 20 mg/ml Air 100 102 60 147 2 20 <br /> Di-isopropyl ether 1 29 024 ppmv 1 20 108 70-125 12 20 <br /> Di-isopropyl ether 538 1 0 mg/ml Air 500 108 70-125 11 20 <br /> Ethylbenzene 495 0 50 " 500 97 89-122 4 20 <br /> Ethylbenzene 1 12 0 12 ppmv 1 15 97 89-122 5 20 <br /> Ethyl tent-butyl ether 464 10 mg/m'Air 5 00 93 71-120 13 20 <br /> Ethyl tert-butyl ether 1 11 0 24 ppmv 1 20 92 71-120 13 20 <br /> Methyl tert-butyl ether 509 050 mg/ml Air 500 102 70-122 11 20 <br /> Methyl cert-butyl ether 1 42 014 ppmv 1 39 102 70-122 11 20 <br /> Toluene 119 Ola " 133 89 84-119 4 20 <br /> Toluene 4 50 0 50 mg/m'Air 500 90 84-119 4 20 <br /> Xylenes(total) 327 0 12 ppmv 346 95 86-132 0 3 20 <br /> Xylenes(total) 14 2 050 mg/ml Air 150 95 86-132 0 20 <br /> Surrogate Dibromofluoromeihane 534 1, 500 107 84-122 <br /> Surrogate Dibromofluoromethane 0 681 ppmv 0 638 107 84-122 <br /> Sequoia 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 rn its entirety <br /> Page 9 of i 1 <br />