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1455 McDowell Blvd,North <br /> a— ) Sequoia Petaluma,CA Ste CA 449544 <br /> (707)792 1865 <br /> " Analytical FAX(707)792 0342 <br /> . www sequotal abs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406416 <br /> 3017 Kilgare 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 826013 - Quality Control <br /> Sequoia Analytical-PetaIuma <br /> Reporting Spice Source %REC RPD <br /> I <br /> Analyte Result Limn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4070006-EPA 5030B waters <br /> Blank(4070006-BLKI) Prepared&Analyzed 07/01/04 <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 050 " <br /> Surrogate Dtbromofluoromethane 550 500 110 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 550 500 110 74-135 <br /> Surrogate Toluene d8 543 500 109 84-119 <br /> Laboratory Control Sample(4070006-BSI) Prepared&Analyzed 07/01/04 <br /> Benzene 431 050 ug/I 500 86 81-118 <br /> . Ethylbenzene 4 83 050 500 97 89-122 <br /> Methyl tert butyl ether 453 050 5 00 91 77-123 <br /> Toluene 455 050 500 91 84-119 <br /> Xylenes(total) 145 050 <br /> 150 97 86-132 <br /> Surrogate Dibromoflucromethane 560 500 112 84-121 <br /> Surrogate 1 2-Dichloroethane-d4 561 Soo 111 74-135 <br /> Surrogate Toluene-d8 548 500 110 84-119 <br /> Laboratory Control Sample Dup(4070006-BSD]) Prepared&Analyzed 07/01/04 _ <br /> Benzene 439 050 ug/I 500 88 81 1118 2 20 <br /> Ethylbenzene 504 050 Soo 101 89-122 4 20 <br /> Methyl tert-butyl ether 455 050 500 91 77-123 04 20 <br /> Toluene 481 050 500 96 84-119 6 20 <br /> Xylenes(total) 150 050 ]so 100 86-132 3 20 <br /> Surrogate Dibromofluoromethane 528 500 106 84-112 <br /> Surrogate 12-Dichloroethane-d4 566 " 500 113 74-135 <br /> Surrogate Toluene d8 5 63 500 113 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 basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 20 <br />