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Blvd <br /> 1455 McDowell North Ste t7 <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> 1 www sequmalabs com <br /> Secor-Rancho Cordova Project Arco Site 4932 Stockton,CA P310580 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11106/03 18 54 <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 3110024-EPA 5030 waters <br /> Blank(3110024-BLK1) Prepared&Analyzed 11/03/03 <br /> Benzene ND 050 ugll <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylencs(total) ND 050 " <br /> Surrogate Dibromofluoromethane 516 " 5 00 103 84-111 <br /> Surrogate 11 Dtchloroethane-d4 538 500 108 74-135 <br /> Surrogate Toluene-d8 4 63 500 93 84-119 <br /> Laberatog Control Sample(3130024-BSI) Prepared&Analyzed 11/03/03 <br /> Benzene 475 050 ugll 500 95 81-118 <br /> Ethylbenzene 5 18 050 500 104 89-122 <br /> Methyl Cert-butyl ether 477 050 500 95 77-123 <br /> Toluene 5 10 0 50 500 102 84-119 <br /> Xylenes(total) 146 050 150 97 86-132 <br /> Surrogate Dibromofluoromethane 514 500 103 84-111 <br /> Surrogate 12-Dtchloroethane-d4 4 85 500 97 74-135 <br /> Surrogate Toluene-d8 4 69 5 00 94 84-119 <br /> Laboratory Control Sample Du (3110024-BSD1) Prepared&Analyzed 11/03/03 <br /> Benzene 493 0 50 ug11 500 99 81-118 4 20 <br /> Ethylbcnzene 5 13 050 500 103 89-122 1 20 <br /> Methyl tett-butyl ether 4 83 050 Soo 97 77-123 1 20 <br /> Toluene 5 20 050 500 104 84-119 2 20 <br /> Xylenes(total) 148 050 150 99 86-132 1 20 <br /> Surrogate Dibromofluoromethane 548 500 110 84-112 <br /> Surrogate 1,2-Dtchloroethane-d4 509 S 00 101 74-135 <br /> Surrogate Toluene-d8 503 300 101 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance wash the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight busts <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 19 <br />