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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma, CA 94954 <br /> . <br /> a— ) (707)792-1965 <br /> Analytical FAX 792-0342342 <br /> www sequoiequoialabs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/19/04 15 02 <br /> Volatile Organic Compounds by EPA Method 8260B-Qual>Ity Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Sptke Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4030416-EPA 5030B waters <br /> Laboratory Control Sample 4030416-BS1Prepared&Analyzed 03/15/04 <br /> Benzene 548 050 ug/l 5 00 110 9I-118 <br /> Ethylbenzene 5 64 050 5 00 113 89-122 <br /> Methyl tert-butyl ether 5 63 050 5 00 113 77-123 <br /> Toluene 5 31 050 5 00 106 84-119 <br /> Xylenes(total) 172 050 15 0 115 86-132 <br /> Surrogate Dibromofluorom ethane 5 15 5 00 103 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 524 500 105 74-135 <br /> Surrogate Toluene d8 4 55 500 91 84-119 <br /> I <br /> Matrix SpikeL4030416-MSI) Source P403171-06 Prepared&Analyzed 03/15/04 <br /> Benzene 5 59 0 50 ugll 5 00 ND 112 81-118 <br /> Ethylbenzene 5 67 0 50 5 00 ND 113 89-122 <br /> Methyl tert-butyl ether 145 0 50 5 00 8 3 124 77-123 QC01 <br /> Toluene 5 47 0 50 5 00 0 15 106 84-119 <br /> Xylenes(total) 173 0 50 150 ND 115 86-132 <br /> Surrogate Dibromofluoromethane 519 5 00 104 84-121 <br /> Surrogate 1 2-Dtchloroethane-d4 522 500 104 74-135 <br /> Surrogate Toluene d8 458 S 00 92 84-119 <br /> Matrix Spike Dup(4030416-MSD1) Source P403171-06 Prepared&Analyzed 03/15/04 _ <br /> Benzene 5 89 0 50 ugll 5 00 ND 118 81-118 5 20 <br /> Ethylbenzene 5 78 0 50 5 00 ND 116 89-122 2 20 <br /> Methyl tert-butyl ether 15 3 050 5 00 8 3 140 77-123 5 20 QC01 <br /> Toluene 5 65 0 50 5 00 0 15 110 84-119 3 20 <br /> Xylenes(total) 180 0 50 15 0 ND 120 86-132 4 20 <br /> Surrogate Dibromofluoromethane 541 5 00 108 84-122 <br /> Surrogate 1,2-DichlaroeMane-d4 5 72 500 114 74-135 <br /> Surrogate Toluene d8 490 5 00 98 84-119 <br /> .Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain j <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 /> I <br /> Page 19 of 23 <br />