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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX equoi labs c 42 <br />— www sequoiafabs com <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 4070610-EPA 5030B waters <br /> Blank(4070610-BLK1) Prepared&Analyzed 07/29/04 <br /> Benzene ND 050 ugA <br /> Ethylbenzene ND 050 <br /> Methyl tort butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 480 500 96 84-122 <br /> Surrogate 12 Dichloroethane-d4 5 14 500 103 74-135 <br /> Surrogate Toluene d8 520 500 104 84-119 <br /> Laboratory Control Sample(4070610-BS1) Prepared&Analyzed 07/29/04 <br /> Benzene 491 050 ug/1 500 98 81-118 <br /> Ethylbenzene 5 33 050 11 Soo 107 89-122 <br /> Methyl tort butyl ether 477 050 500 95 77-123 <br /> Toluene 5 11 050 500 102 84-119 <br /> Xylenes(total) 15 8 050 150 105 66-132 <br /> Surrogate Drbromofluoromethane 4 78 500 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 90 500 98 74-135 <br /> Surrogate Toluene-d8 524 " 500 105 84-119 <br /> Laboratory Control Sample Dup(4070630-BSD1) Prepared&Analyzed 07/29/04 <br /> Benzene 476 050 ugA 500 95 81-118 3 20 <br /> Ethylbenzene 5 16 050 500 103 69-122 3 20 <br /> Methyl tert-butyl ether 500 050 500 100 77-123 5 20 <br /> 'toluene 495 050 Soo 99 84-119 3 20 <br /> Xylenes(total) 15 3 0 50 15 0 102 86-132 3 20 <br /> Surrogate Drbromofluoromelhane 489 500 98 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 503 500 101 74-135 <br /> Surrogate Toluene d8 521 500 104 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 /> This analytical report must be reproduced in its entirety <br /> Page 15 of 17 <br />