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It �� <br /> Sequoia 1455 McDowell Blvd,North Ste 1) <br /> 4DPetaluma,CA 94954 <br /> qW Analytical (707)792-t 865 <br /> FAX(707)792-0342 <br /> www seyuoialahs co <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P309112 <br /> 3017 Kilgare Road Suite 100 Project Number 30732 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09/16/03 18 59 <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 3090336-EPA 5030 waters <br /> Laboratory Control Sample Dup(3090336-BSD1) _ Prepared&Analyzed 09/16/03 <br /> Tert-amyl methyl ether 4 91 10 ug/l 500 98 70-116 6 20 -� <br /> Benzene 5 32 050 5 00 106 81 118 5 20 <br /> Tert-butyl alcohol 122 20 100 122 62-142 5 20 <br /> Di-isopropyl ether 529 1 0 5 00 106 71-121 6 20 <br /> 1,2-Dibromoethane(EDB) 4 99 0 50 5 00 100 92-117 7 20 <br /> 1,2-Dichloroethane 5 16 050 500 103 79-126 4 20 <br /> Ethanol 153 100 100 153 65-135 48 20 Q LIM <br /> Ethylbenzene 5 23 050 5 00 105 89-122 3 20 <br /> Ethyl tert-butyl ether 5 15 1 0 5 00 103 71-110 6 20 <br /> Methyl tert-butyl ether 5 19 0 50 5 00 104 77 123 5 20 <br /> Toluene 5 35 050 5 00 107 84-119 5 20 <br /> Xylenes(total) 15 4 0 50 150 103 86-132 4 20 <br /> Surrogate Dibromofluoromethane 637 6 00 106 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 5 54 6 00 92 74-135 <br /> Surrogate Toluene-d8 6 16 600 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 86 6 00 98 86 119 <br /> Sequoia 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 10 of 11 <br />