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Sequoia 1455 McDowell Slvd,North Ste D <br /> Petaluma, GA 94954 <br /> 4D <br /> (707)792-1865 <br /> qW Analytical FAX(707)792-0342 <br /> www sequocalabs eom <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P311302 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/01/03 15 25 <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 %F-EC Limits RPD Limit Notes <br /> Batch 3110489-EPA 5030 waters <br /> Blank 3110489-BLKI Prepared&Analyzed 11/21/03 <br /> Benzene ND 0 50 ug/l <br /> Ethylbenzene ND 0 50 " <br /> Methyl terl-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 4 97 4 50 110 84-121 <br /> Surrogate 1 2-Dichlaroethane-d4 525 4 50 117 74-135 <br /> Surrogate Toluene-d8 528 450 117 84-119 <br /> Laboratory Control Sample 3110489-BS1 Prepared&Analyzed 11/21/03 <br /> Benzene 501 050 ugA 5 00 100 81-118 <br /> Ethylbenzene 505 050 5 00 101 89-122 <br /> Methyl cert-butyl ether 4 71 050 5 00 94 77-123 <br /> Toluene 5 00 050 5 00 100 84-119 <br /> Xylenes(total) 156 0 50 15 0 104 86-132 <br /> Surrogate Dtbromofluoromethane 5 10 450 113 84-122 <br /> Surrogate 1 2-Dichlaroethane-d4 506 450 112 74-135 <br /> Surrogate Toluene-d8 536 450 119 84-119 <br /> Matrix Spike(3110489-MS1) Source P311407-03 Prepared&Analyzed 11/21/03 <br /> Benzene 5 19 0 50 ug/1 5 00 ND 104 81-118 <br /> Ethylbenzene 524 0 50 5 00 ND 105 89-122 <br /> Methyl tert butyl ether 5 07 0 50 5 00 ND 101 77-123 <br /> Toluene 5 24 0 50 5 00 ND 105 84-119 <br /> Xylenes(total) 15 9 0 50 15 0 ND 106 86-132 <br /> Surrogate Dtbromofluoromethane 5 17 4 50 115 84-122 <br /> Surrogate 12-Dichlaroethane-d4 525 4 50 117 74-135 <br /> Surrogate Toluene d8 5 35 4 50 119 84-119 <br /> .Sequoia Analytical-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 12 of 15 <br />