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Sequoia Walnut N et Lane <br /> t Crr eek,,CACA 94.598 <br /> (925)988-%W <br /> Analytical FAX equo alabs c 73 <br /> www sequoialabs cora I <br /> Alft <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#595,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Clint Harms 03-Aug-01 14 02 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes I <br /> Batch 1HO1022- EPA 5030B(PIT) <br /> Blank(1[01022-BLKI) Prepared&Analyzed 01-Aug-01 <br /> Ethanol _ ND� - 500 fugll <br /> tent-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-tsopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tort-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 <br /> Ethylene dibromide ND 20 " <br /> Surrogate Dibromo luoromethane _ 4 510 500 102 50-150 <br /> Surrogate 11-Dichloroelhane-d4 497 300 994 50-150 <br /> Blank(IH01022-BLK2) Prepared&Analyzed 02-Aug-01 <br /> Ethanol -- - ------- - —ND 500 ugll _ <br /> tort-Butyl alcohol ND 20 " <br /> Methyl Cert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl Cert-butyl ether ND 20 <br /> ten-Amyl methyl ether _ _ - __ -ND _ 2 0_ <br /> l 2-Dtchloroethane ND 20 " <br /> Ethylene dibromide ND -- 20 _ <br /> Surrogate DibromoJluoromethane 478 500 956 50-150 <br /> Surrogate 1,1-Dichloroethane-d4 498 500 996 50-150 <br /> LCS(1H01022-BSI) Prepared&Analyzed 01-Aug-01 <br /> Methyl ten-butyl eiher_�____ 401 W 20 W ug/l Soo 802 70-130 <br /> Surrogate Drbrom_/uoromelhane 48 9 500 978 50-150 — <br /> Surrogate 1 2-Dichloroethane-d4 484 500 968 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entire <br /> Page 5 of 7 ' <br />