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1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma CA 94954 <br /> Analytical (707)792 0865 <br /> FAX 792 4342 <br /> www sequoiequoialahs coin <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P407278 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/11/04 09 51 <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 4070538- EPA 5030B waters <br /> Blank(4070538-BLKI) Prepared&Analyzed 07/27/04 <br /> Benzene ND 050 ug/l <br /> Ethylbenzene ND 050 " <br /> Methyl tert butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 434 400 108 84 122 <br /> Surrogate 12-Dichloroethane-d4 413 400 103 74 135 <br /> Surrogate Toluene-d8 422 400 106 84 119 <br /> Laboratory Control Sample(4070538-BSI) Prepared&Analyzed 07127104 <br /> Benzene 6 17 050 ug/I 500 123 81 118 QC01 <br /> Ethylbenzene 602 050 500 120 89 122 <br /> Methyl tent-butyl ether 600 050 Soo 120 77 123 <br /> Toluene 570 050 500 114 84-119 <br /> Xylenes(total) 18 0 050 ISO 120 86 132 <br /> Surrogate Dibromofluoromethane 423 400 106 84-122 <br /> Surrogate 12-Dichloroethane-d4 3 96 " 400 99 74-135 <br /> Surrogate Toluene-d8 4 53 400 113 84 119 <br /> Laboratory Control Sample Dup(4070538-BSDI) Prepared 07/27/04 Analyzed 07/28/04 <br /> Benzene 649 050 ug/l 500 130 81-118 5 20 QC01 <br /> Ethylbenzene 597 050 Soo 119 89-122 0 8 20 <br /> Methyl tert butyl ether 592 050 Soo 118 77 123 1 20 <br /> Toluene 587 050 500 117 84-119 3 20 <br /> Xylenes(total) 191 0 50 15 0 127 86-132 6 20 <br /> Surrogate Dibromofluoromethane 4 63 400 116 84-122 <br /> Surrogate 12 Dichloroethane d4 443 400 1I1 74-135 <br /> Surrogate Toluene-d8 4 61 400 115 84 119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> Thu analytical report must be reproduced in its entirety <br /> Page 14 of 17 <br />