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Sequoia 0 <br />� Analytical <br />• 404 N. Wiget Lane <br />Walnut Creek, CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www,sequoialabs.com <br />Secor - Rancho Cordova Project: Arco <br />3017 Kilgore Rd., Ste. #100 Project Number: Arco # 2133, Stockton Reported: <br />Rancho Cordova CA., 95670 Project Manager: Rusty Benkosky 14 -Aug -02 13:16 <br />Polychlorinated Biphenyls by EPA Method 8082 - 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 2080107 - EPA 3550A <br />Blank (2080107-BLKI) <br />Prepared & Analyzed: 06 -Aug -02 <br />PCB -1016 <br />ND <br />33 <br />ug/kg <br />PCB -1221 <br />ND <br />33 <br />" <br />PCB -1232 <br />ND <br />33 <br />" <br />PCB -1242 <br />ND <br />33 <br />" <br />PCB -1248 <br />ND <br />33 <br />" <br />PCB -1254 <br />ND <br />33 <br />" <br />PCB -1260 <br />ND <br />33 <br />" <br />Surrogate: Decachlorobiphenyl <br />64.7 <br />66.7 97 46-115 <br />LCS (2080107 -BSI) <br />Prepared & Analyzed: 06 -Aug -02 <br />PCB -1016 <br />256 <br />33 <br />ug/kg <br />333 77 57-115 <br />PCB -1260 <br />330 <br />33 <br />333 99 71-120 <br />Surrogate: Decachlorobiphenyl <br />62.5 <br />66.7 94 46-115 <br />LCS Dup (2080107-BSD1) <br />Prepared & Analyzed: 06 -Aug -02 <br />PCB -1016 <br />252 <br />33 <br />ug/kg <br />333 76 57-115 2 35 <br />PCB -1260 <br />334 <br />33 <br />" <br />333 100 71-120 1 35 <br />Surrogate: Decachlorobiphenyl 64.2 1166.7 96 46-115 <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 entirety. <br />Page 19 of 20 <br />