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eDSequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma, CA 94954 <br /> Anal tical (707)792 1855 <br /> Y FAX(707)792-0342 <br /> www sequotalabs cam <br /> SeeOr-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <br /> Volatile Organic Compounds by EPA Method 8260H-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 4020358-EPA 5030B waters <br /> Blank 4020358-BLKI Prepared&Analyzed 02/17/04 <br /> Benzene ND 0 50 ug/l <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 521 S 00 104 84-121 <br /> Surrogate 1 1-Dtchloroethane-d4 4 94 500 99 74-135 j <br /> Surrogate Toluene-d8 448 5 00 90 84-119 <br /> I <br /> Laboratory Control Sample 4020358-BS1 Prepared&Analyzed 02/17/04 <br /> Benzene 5 51 0 50 ugll 5 00 110 81-118 <br /> • Ethylbenzene 5 89 0 50 5 00 118 89-122 <br /> Methyl tert-butyl ether 5 18 0 50 5 00 104 77-123 <br /> i <br /> Toluene 5 48 0 50 5 00 110 84-119 <br /> Xylenes(total) 17 5 0 50 15 0 117 86-132 <br /> Surrogate Dibromofluoromethane 4 78 5 00 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 459 500 92 74-135 <br /> Surrogate Toluene d8 455 500 91 84 119 <br /> Matnx Spike(4020358-MSI) Source P402155-01 _ Prepared&Analyzed_02/17/04 _ <br /> Benzene 348 12 ug/l 125 200 118 81-118 <br /> Ethylbenzene 162 12 125 15 118 89-122 <br /> Methyl cert-butyl ether 148 12 125 24 116 77-123 <br /> Toluene 146 12 125 6 5 112 84-I19 <br /> Xylenes(total) 447 12 375 ND 119 86 132 <br /> Surrogate Dibromofluoromethane 4 85 5 00 97 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 4 77 5 00 95 74-135 <br /> Surrogate Toluene d8 455 5 00 91 84-119 <br /> I <br /> Sequoia Analytical Analytical-Petaluma The results in this report apply to the samples analyzed to 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 15 of 18 <br />