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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (916)922 1 9600 <br /> FAX(916) 921-0100 <br /> Analytical ,�, SegU°talabs °n, <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 01/31/01 17 11 <br /> Miscellaneous Analyses - 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 <br /> Batch 1A18025-General Pre <br /> Blank(1A18025-BLKI) Prepared 01/18/01 Analyzed 01/19/01 <br /> Methane ND 50 mg/I <br /> Butane ND 50 <br /> Propane ND 50 " <br /> Ethane ND 50 " <br /> Pentane ND 50 <br /> Hexane ND 50 <br /> LCS(1A18025-BSI) Prepared 01/18/O1 Analyzed 01/19/01 <br /> Methane 1170 50 mg/1 989 118 65-120 <br /> Butane 1150 50 985 117 65-200 <br /> Propane 1160 50 1010 115 65-200 <br /> 1170 so " 1000 117 65-200 <br /> One 1120 50 973 115 65-200 <br /> Hexane 1050 50 961 109 65-200 <br /> LCS Dup(IA18025-BSD1) Prepared 01/18/01 Analyzed 01/19/01 <br /> Methane 1170 50 mg/I 989 118 65-120 0 30 <br /> Butane 1170 50 985 119 65-200 1 72 200 <br /> Propane 1160 50 1010 115 65-200 0 200 <br /> Ethane 1170 50 1000 117 65-200 0 200 <br /> Pentane 1150 50 973 118 65-200 264 200 <br /> Hexane 1090 50 961 113 65-200 374 200 <br /> Duplicate(IA18025-DUP1) _ __ Source S101245-01 Prepared 01/18/01 Analyzed 01/19/01 <br /> Methane 226 50 mgll 22 269 30 <br /> Butane ND 50 ND 30 <br /> Propane ND 5 0 ND 30 <br /> Ethane ND 50 ND 30 <br /> Pentane ND 5 0 ND 30 <br /> Hexane ND 5 0 ND 318 30 <br /> Ailk <br /> nota Analytical-Sacramento ne results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must he reproduced in its enurely <br /> Page 7 of 8 <br />