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1455 McDowell Blvd North Ste p <br /> Sequoia Petaluma,CA 94954 <br /> ,1)mW Analytical (707)7921865 <br /> FAX(707)792 0342 <br /> www sequoialabs coin• <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406416 <br /> 3017 Ki gare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/14/04 16 40 <br /> DRAFT: 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 4070035-EPA 5030B waters <br /> Blank(4070035-BLK1) Prepared&Analyzed 07/02/04 <br /> Benzene ND 050 ugA <br /> Ethylbenzene ND 050 " <br /> Methyl tert butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 499 500 100 84-122 <br /> Surrogate I 1-Drchloroethane-d4 4 85 500 97 74-135 <br /> Surrogate Toluene-d8 514 500 103 84-119 <br /> Laboratory Control Sample(4070035-BS1) Prepared&Analyzed 07/02/04 <br /> Benzene 524 050 ug/1 500 105 81 118 <br /> Ethylbenzene 514 050 500 103 89-122 <br /> Methyl tert butyl ether 479 050 500 96 77-123 . <br /> Toluene 542 050 500 108 84-119 <br /> Xylenes(total) 165 050 ISO 110 86-132 <br /> Surrogate Dibromofluoromethane 472 Soo 94 84-121 <br /> Surrogate 1 1-Drchloroethane d4 472 500 94 74-135 <br /> Surrogate Toluene-d8 497 500 99 84-119 <br /> Matrix Spike(4070035-MSI) Source P406422-04 Prepared&Analyzed 07/02/04 <br /> Benzene 14600 500 ugA 5000 10000 92 81-118 <br /> Fthylbenzene 7090 500 5000 1900 104 89-122 <br /> Methyl tert-butyl ether 4730 500 5000 ND 95 77-123 <br /> Toluene 23500 500 5000 19000 90 84-119 <br /> Xylenes(total) 30200 500 " 15000 13000 115 86-132 <br /> Surrogate Dibromofluoromethane 484 S 00 97 84-122 <br /> Surrogate 11-Drchloroethane-d4 422 " 500 84 74-135 <br /> Surrogate Toluene-d8 496 Soo 99 84-119 <br /> DRAFT REPORT 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 bases <br /> This analytical report must be reproduced in Its entirety 0 <br /> Page 16 of 20 <br />