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Ste D <br /> Sequoia 1455 McDowell alu AICA 94954 <br /> Petaluma CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> . www sequotalabs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P312141 <br /> 3017 Ktlgare 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 Nates <br /> Batch 3120474-EPA 5030B waters <br /> Blank(3120474-BLKI) Prepared&Analyzed 12/16/03 <br /> Benzene ND 0 50 119/1 <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 5 16 450 115 84-121 <br /> Surrogate 1 2-Dichloroethane-d4 4 78 450 106 74-135 <br /> Surrogate Toluene-d8 5 25 450 117 84-119 <br /> Laboratory Control Sample 3120474-BSl Prepared&Analyzed 12/16/03 <br /> Benzene 5 50 0 50 ug/1 5 00 110 81-118 <br /> W <br /> hylbenzene 530 050 5 00 106 89-122 <br /> ethyl tert-butyl ether 4 94 050 5 00 99 77-123 <br /> Toluene 5 42 050 5 00 108 84-119 <br /> Xylenes(total) 165 050 15 0 110 86-132 <br /> Surrogate Dibromofluoromethane 5 02 450 111 84-122 <br /> Surrogate 1 1-Duhloroethane-d4 4 70 450 104 74-135 <br /> Surrogate Toluene-d8 5 30 " 450 118 84-119 <br /> Laboratory Control Sample Dup(3120474-BSDI) - _- Prepared&Analyzed 12/16/03 <br /> Benzene 5 66 0 50 ug/1 5 00 113 81-118 3 20 <br /> Ethylbenzene 542 050 5 00 108 89-122 2 20 <br /> Methyl tert-butyl ether 5 15 0 50 5 00 103 77-123 4 20 <br /> Toluene 553 050 5 00 111 84-119 2 20 <br /> Xylenes(total) 169 0 50 15 0 113 86-132 2 20 <br /> Surrogate Dibromofluoromethane 5 11 4 50 114 84-122 <br /> Surrogate 1 1-Dichloroethane-d4 4 84 450 108 74-135 <br /> Surrogate Toluene-d8 5 31 450 118 84-119 <br /> i <br /> I <br /> quota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chatn <br /> of custody document Unless otherwise stated results are reported on a wet xeight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 13 of 16 <br />