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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95634 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequotalabs cm <br /> SECOR International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 4493,Stockton,CA Beported <br /> Rancho Cordova CA,95670 Project Mpg- Rusty Benkosky 04/10/02 16 29 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> 15� Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2030252-EPA 5030B[PIT] <br /> Blank(2030252-BLK_1) Prepared&Analyzed 03/20/02 <br /> Benzene — ND 0 50 _ ugh <br /> Bromobenzene ND 0 50 " <br /> Tert-butyl alcohol ND 50 <br /> Bromochloromethane ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Bromodichloromethane ND 0 50 " <br /> Dr-isopropyl ether ND 0 50 " <br /> Bromoform ND 0 50 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Bromomethane ND 1 0 " <br /> Tert-amyl methyl ether ND 0 50 " <br /> Ethanol ND 50 " <br /> 10Butylbe—e:-. ND 0 50 " <br /> 2-Dwhloroethane ND 0 50 " <br /> sec-Butylbenzene ND 0 50 " <br /> Ethylene dibromide ND 0 50 " <br /> tert-Butylbenzene ND 0 50 " <br /> Carbon tetrachloride ND 0 50 " <br /> Chlorobenzene ND 0 50 " <br /> Chloroethane ND 0 50 " <br /> Chloroform ND 0 50 " <br /> Chloromethane ND 050 " <br /> 2-Chlorotoluene ND 0 50 " <br /> 4-Chlorotoluene ND 050 " <br /> Dibromochloromethane ND 0 50 " <br /> 1,2-Dibromoethane ND 0 50 " <br /> Dibromomethane ND 050 " <br /> 1,2-Dibromo-3-chloropropane ND 1 0 " <br /> 1,2-Dichlorobenzene ND 050 <br /> 1,3-Dichlorobenzene ND 0 50 " <br /> 1,4-Dichlorobenzene ND 050 " <br /> Dichlorodifluoromethane ND 050 " <br /> 1,1-Dichloroethane ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> I,1-Dichloroethene ND 050 " <br /> cis-1,2-Dichloroethene ND 050 " <br /> �equoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 21 of 27 <br />