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1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma CA 94954 <br /> Analytical (707)792-1665 <br /> FAX equoi labs c 42 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P307150 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/23/03 16 39 <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 %uREC Limits RPD Limit Notes <br /> Batch 3070389-EPA 5030 waters <br /> Blank(3070389-BLKI) Prepared&Analyzed 07/18/03 <br /> Benzene ND 050 ugA <br /> Ethylbenzene ND 050 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Drbromofluoromethane 4 63 450 103 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 445 4 50 99 74-135 <br /> Surrogate Toluene-d8 4 77 " 450 106 84-119 <br /> Laboratory Control Sample 3070389-BS1 Prepared&Analyzed 07/18/03 <br /> Benzene 5 24 050 ugll 5 00 105 81-118 <br /> ethyl tert-butyl ether 4 73 050 5 00 95 77-123 <br /> oluene 5 03 050 5 00 101 84-119 <br /> Surrogate Drbromofluoromethane 4 45 450 99 84-121 <br /> Surrogate 1,2-Dichloroethane-d4 4 23 450 94 74-135 <br /> Surrogate Toluene-d8 4 78 450 106 84-119 <br /> Laboratory Control Sample Du 3070389-BSDI Prepared&Analyzed 07/18/03 <br /> Benzene 5 31 050 ug/I 5 00 106 81418 1 20 <br /> Methyl tert-butyl ether 5 16 050 5 00 103 77-123 9 20 <br /> Toluene 5 13 050 5 00 103 84-119 2 20 <br /> Surrogate Drbromofluoromethane 4 55 450 101 84-111 <br /> Surrogate 1 1-Dichloroethane-d4 446 450 99 74-135 <br /> Surrogate Toluene-d8 4 74 450 105 84-119 <br /> Batch 3070395-EPA 5030 waters <br /> Blank(3070395-BLKI) Prepared&Analyzed 07/19/03 <br /> Benzene ND 050 ug/i <br /> Ethylbenzene ND 050 " <br /> Methyl test-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibroinofluoromethane 4 73 4 50 105 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 463 4 SO 103 74-135 <br /> Surrogate Toluene-d8 4 73 4 50 105 84-119 <br /> Wiluoia 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 13 of 16 <br />