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404 N W&get Lane Sequoia Walnut Creek CA 94598 /� (925)988 9600 Analytical - - -- - - - - -- - FAX{925►488 9673 www sequotalabs com l cor-Rancho Cordova Project Arco l7 Kilgore Rd Ste #100 Project Number Arco#4932, Stockton Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 31-Ju1-01 10 56 ' Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Walnut Creek Reporting talyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes vIW5,30'(W107294-04)Soil Sampled 13-Jul-010000 Received 17-Jul-01 14 25 1tButyl alcohol ND 25 mg/kg 100 IG27018 26-Ju]-01 27-Jul-01 EPA 82606 thyl ten-butyl ether ND 020 isopropyl ether ND 010 Y' tett-butyl ether ND 010 J Amyl methyl ether ND 010 " -Drchloroethane ND 010 " .2-Drbromoethane ND 020 " frogate Dibromofluoromethane 106% 50-150 ; rogate 1 2-Drchloroethane-d4 100% 50-150 VIW5,35'(W107294-05)Sod Sampled 13-Jul-01 00 00 Received 17-Jul-01 14 25 F,Bu,lyl alcohol ND 25 mg/l g 100 1Ce27018 26-Jul-01 27-Jul-01 EPA 82605 ytett-butyl ether ND 020 ')r-isopropyl ether ND 010 " butyl ether ND 010 " I methyl ether ND 010 " I-Dichloroethane ND 010 " Drbromoethane ND 020 rogate Dibromofluoromethane 102% 50-150 T " t-rogate 12-Drchloroethane-d4 104% 50-150 " 5,40'(WI07294-06)Soil Sampled 13-Jul-01 00 00 Received 17-Jul-01 14 25 -Butyl alcohol ND 25 mg/kg 100 1G27018 26-Jul-01 27-Jul-01 EPA 8260E ethyl tert-butyl ether ND 020 Ji-isopropyl ether ND 010 yl tett-bu ether ND 010 " -Amyl methyl ether ND 010 " 1,2-Drchloroethane ND 010 fDibromoethane ND 020 rogate Dibromofluoromethane Y 110% 50-150 Surrogate 12-Dichloroethane-d4 105% 50-150 " i a Analytical- Walnut Creek The results in this report apply to the samples analyzed to accordance with the chain of custody document This analytical report must be reproduced in its entirety Page 6 of 13