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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95634 <br /> 4 (916)922 t 9600 <br /> FAX(916)921 0100 <br /> a- ) <br /> Analytical www sequoialabs corn <br /> SECOR International-Rancho Cordova Project ARCO 2093 Tracy,CA <br /> 3017 Kilgore Road, Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/03/01 14 22 <br /> Miscellaneous Analyses - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Leve] Result %REC Limits RPD Limit Notes <br /> Batch OL31003-General Pre <br /> Blank(0L31003-BLK1) Prepared&Analyzed 12/19/00 <br /> Methane ND 5 0 mg11 <br /> Butane ND 5 0 " <br /> Propane ND 5 0 " <br /> Ethane ND 5 0 " <br /> Pentane ND 50 " <br /> Hexane ND 50 <br /> LCS(OL31003_BSI)_ __ _ __ _ —Prepared&Analyzed 12/19/00 <br /> Methane 1110 5 0 mg/i 989 112 80-120 <br /> Butane 1 160 50 985 118 0-200 <br /> Propane 1170 50 1010 116 0-200 <br /> Ore. 1160 50 1000 116 0-200 <br /> n 1 140 5 0 973 117 0-200 <br /> Hexane 1090 50 961 113 0-200 <br /> LCS Dup(OL31003-BSDI) _ Prepared&Analyzed 12/19/00 <br /> Methane 1 150 5 0 mg/l 989 116 80-120 3 54 30 <br /> Butane 1200 5 0 985 122 0-200 3 39 200 <br /> Propane 1210 5 0 1010 120 0-200 3 36 200 <br /> Ethane 1200 5 0 1000 120 0-200 339 200 <br /> Pentane 1160 50 973 119 0-200 174 200 <br /> Hexane 1080 50 961 112 0-200 0 922 200 <br /> Duplicate(OL31003-DUP1) Source S012231-01 Prepared&Analyzed W12119/00 <br /> Methane 1 1 2 50 ing/I I l l 80 30 <br /> Butane ND 0 ND 400 30 <br /> Propane ND 0 ND 30 <br /> Fthane ND 0 ND 30 <br /> PentanL ND 0 ND 30 <br /> Hexane ND '10 ND 30 <br /> uota Analytical-Sacramento the results in this report apply to the samples arral)zed in accordance ixuh the chain of <br /> custody document This analytical report must he reproduced in its entirety <br /> Page 7 o1 8 <br />