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1455 McDowell Blvd,North Ste 1) <br /> Sequoia Petaluma CA 94954 <br /> a— )► Analytical FAX(707)792-(707)792-0342342 <br /> www sequaialahs cc <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 30171Ctlgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPB <br /> Analyte Result Limit units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020278-EPA 5030B waters <br /> Blank 4020278-BLK1) Prepared&Analyzed 02/11/04 <br /> Benzene ND 050 ugll <br /> Ethylbenzene ND 050 " <br /> Methyl tort-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Drbromofluoromethane .584 5 00 117 84-121 <br /> Surrogate 1 2-Dichloroethane-d4 529 500 106 74-135 <br /> Surrogate Toluene-d8 4 62 500 92 84-119 <br /> Laboratory Control Sample 4020278-BSl Prepared&Anal zed 02/11/04 <br /> Benzene 4 97 050 ug/l 5 00 99 81-118 <br /> Ethylbenzene 4 49 0 50 5 00 90 89-122 <br /> Methyl tert-butyl ether 5 85 050 " 5 00 117 77-123 • <br /> Toluene 453 050 5 00 91 84-119 <br /> Xylenes(total) 13 9 0 50 15 0 93 86-132 <br /> Surrogate Drbromofluoromethane 5 30 500 106 84-122 <br /> Surrogate 1 1-Dichloroethane-d4 4 95 5 00 99 74-135 <br /> Surrogate Toluene d8 452 5 00 90 84-119 <br /> Laboratory Control Sample Du 4020278-BSD] Prepared&Analyzed 02/11/04 <br /> Benzene 533 050 119/1 5 00 107 81-118 7 20 <br /> Ethylbenzene 476 0 50 500 95 89-122 6 20 <br /> Methyl tert-butyl ether 5 71 0 50 500 114 77-123 2 20 <br /> Toluene 502 0 50 5 00 100 84-119 10 20 <br /> Xylenes(total) 14 4 0 50 150 96 86-132 4 20 <br /> Surrogate Dibromofluoromethane 5 05 " 500 101 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 5 09 5 00 102 74-135 <br /> Surrogate Toluene-d8 4 78 5 00 96 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 0 <br /> Page 14 of 18 <br />