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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (D (707)792 1865 <br /> +qW Analytical „�seq(707)792 <br /> 0342 <br /> 0 <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P312141 <br /> 3017 Kilgare Road Suite 100 Project Number (none] Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/22/03 14 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 3120480-EPA 5030E waters <br /> Blank(3120480-BLKl) Prepared&Analyzed 12/17/03 _ <br /> Benzene ND 0 50 ug/l <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluorom ethane 5 92 600 99 84-111 <br /> Surrogate 1 1-Dwhiloroethane-d4 5 83 600 97 74-135 <br /> Surrogate Toluene-d8 6 18 600 103 84-119 <br /> Laboratory Control Sample 3120480-BS1 Pre amd&Analyzed 12/17/03 <br /> Benzene 4 80 0 50 u9/1 500 96 81-118 <br /> Ethylbenzene 505 0 50 5 00 101 89-122 <br /> Methyl tert-butyl ether 4 42 0 50 5 00 88 77-123 • <br /> Toluene 466 0 50 5 00 93 84-119 <br /> Xylenes(total) 156 050 15 0 104 86-132 <br /> Surrogate Dibromofluoromethane 597 600 loo 84-122 <br /> Surrogate 12-Dtchloroethane-d4 6 05 600 101 74-135 <br /> Surrogate Toluene-d8 6 28 600 105 84-119 <br /> Laboratory Control_Sample Dup(3120480-BSDI) Prepared&Analyzed 12/17/03 <br /> Benzene 4 96 0 50 u911 5 00 99 81-118 3 20 <br /> Ethylbenzene 5 22 050 5 00 104 89-122 3 20 <br /> Methyl tert-butyl ether 4 57 050 5 00 91 77-123 3 20 <br /> Toluene 4 94 050 5 00 99 84-119 6 20 <br /> Xylenes(total) 15 9 050 15 0 106 86-132 2 20 <br /> Surrogate Dibromofluoromethane 5 98 600 100 84-121 <br /> Surrogate 1 2-Dichloroethane-d4 S 95 606 99 74-135 <br /> Surrogate Toluene-d8 617 600 104 84-119 <br /> Sequoia Analyttcal-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 14 of 16 <br />