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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342corn FAX <br /> sequoialabs com <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P411271 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA, 95833 Project Manager Jay Johnson 11/15/04 13 28 <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 4110355- EPA 5030E waters/EPA 8260B <br /> Laboratory Control Sample(4110355-BSI) Prepared&Analyzed 11/12/04 <br /> Ethanol 924 100 mg/ml Air 100 92 55-200 <br /> Ethanol 491 53 ppmv 53 2 92 55-200 <br /> Ethylbenzene 522 050 mg/m'Air 5 00 104 89-122 <br /> Ethylbenzene 121 012 ppmv 115 105 89-122 <br /> Ethyl tert-butyl ether 527 10 mg/ml Air 500 105 71-120 <br /> Ethyl tert-butyl ether 1 26 024 ppmv 120 105 71-120 <br /> Methyl tert-butyl ether 535 050 mg/m'Air Soo 107 70-122 <br /> Methyl tert-bury]ether 149 014 ppmv 1 39 107 70-122 <br /> Toluene 141 013 133 106 84-119 <br /> Toluene 529 050 mg/m'Air Soo 106 84-119 <br /> Xylenes(total) 367 0 12 ppmv 346 106 86-132 <br /> es(total) 159 050 mg/ml Air 150 106 86-132 <br /> rogate Dibromofluoromethane 0 707 ppmv 0 637 111 84-122 <br /> Surrogate Dibromojluoromethane 555 mg/ml Air 500 111 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 579 500 116 74-135 <br /> Surrogate 1,2-Dichloroethane-d4 137 ppmv 119 115 74-135 <br /> Surrogate Toluene-d8 139 " 133 105 84-119 <br /> Surrogate Toluene-d8 524 mg/ml Air 5 00 105 84-119 <br /> Laboratory Control Sample Dup(4110355-BSD/) Prepared&Analyzed 11/12/04 <br /> Tert-amyl methyl ether 130 024 ppmv 1 20 108 78-117 3 20 <br /> Tert-amyl methyl ether 542 1 0 mg/ml Air 500 108 78-117 3 20 <br /> Benzene 165 016 ppmv 157 105 81-118 2 20 <br /> Benzene 526 050 mg/ml Air 500 105 81-118 2 20 <br /> Tert-butyl alcohol 360 6 6 ppmv 33 1 109 60-147 6 20 <br /> Tert-butyl alcohol 109 20 mg/ml Air 100 109 60-147 7 20 <br /> Di-isopropyl ether 571 1 0 " 500 114 70-125 3 20 <br /> Di-isopropyl ether 137 024 ppmv 1 20 114 70-125 3 20 <br /> Ethanol 93 5 100 mg/ml Air 100 94 55-200 1 20 <br /> Ethanol 497 53 ppmv 53 2 93 55-200 1 20 <br /> Ethylbenzene 126 012 115 110 89-122 4 20 <br /> Ethylbenzene 544 050 mg/ml Air 5 00 109 89-122 4 20 <br /> Ethyl tert-butyl ether 5 56 10 11500 111 71-120 5 20 <br /> Ethyl tert-butyl ether 133 024 ppmv 120 111 71-120 5 20 <br /> Methyl tert-butyl ether 156 0 14 139 112 70-122 5 20 <br /> Methyl tert-butyl ether 5 61 0 50 mg/ml Air 500 112 70-122 5 20 <br /> uola 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 8 of 10 <br />