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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792 0342 <br /> Y FAX(747)792 0342 <br /> • www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P401156 <br /> 3017 Kilgore Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/27/04 15 26 <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 4010246-EPA 5030B waters <br /> Blank 4010246-BLKI) Pre ared&Analyzed 01/15/04 <br /> Benzene ND 0 50 ug/1 <br /> Ethylbenzene ND 050 " <br /> Methyl cert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate DibromoJluoromethane 444 450 99 84-112 <br /> Surrogate I 1-Dichloroethane-d4 461 450 101 74-135 <br /> Surrogate Toluene-d8 457 450 102 84-119 <br /> LaboratoEX Control Sample 4010246-BS1 Prepared&Analyzed 01/15/04 <br /> Benzene 484 0 50 ug/1 5 00 97 81-118 <br /> .Ethylbenzene 4 95 0 50 5 00 99 89-122 <br /> Methyl tert butyl ether 5 15 0 50 5 00 103 77-123 <br /> Toluene 4 78 050 500 96 84-119 <br /> Xylenes(total) 15 1 0 50 15 0 101 86-132 <br /> Surrogate Dibromofluorom ethane 4 45 450 99 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 78 4 50 106 74-135 <br /> Surrogate Toluene d8 456 450 101 84-119 <br /> Laboratory Control Sample Dup(4010246-BSD]) Prepared&Analyzed 01/15/04 _ <br /> Benzene 5 09 0 50 ugA 500 102 81-118 5 20 <br /> Ethylbenzene 5 13 0 50 5 00 103 89-122 4 20 <br /> Methyl tert-butyl ether 5 35 0 50 5 00 107 77-123 4 20 <br /> Toluene 5 00 0 50 5 00 100 84-119 4 20 <br /> Xylenes(total) 15 8 050 150 105 86-132 5 20 <br /> Surrogate Dibromofluoromethane 442 450 <br /> 98 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 70 450 104 74-135 <br /> i <br /> Surrogate Toluene-d8 453 450 101 84-119 <br /> SequoiaAnalytical-Petaluma The results in this report apply to the samples analyzed in accordance with the thorn <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 13 of 16 <br />