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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-96W <br /> la) FAX(916)921-0100 <br /> WOAnalytical www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA Sampled 6129/00 <br /> 3017 Kilgore Road, Suite 100 Project Number NIA Received 6/29100 <br /> Rancho Cordova,CA 95670 Pro ect Manager Rusty Benkosky Reported 7/28,817/00 <br /> Miscellaneous Analyses/Quality Control <br /> Sequoia Analytical-Walnut Creek <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Anal eAnalyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch OG31024 Date Prepared 7127100 Extraction Method General Pre <br /> Blank OG31024-BLKI <br /> Methane 7/27/00 ND mgA 50 <br /> Butane ND 50 <br /> Propane ND 50 <br /> Ethane ND 5 0 <br /> Pentane ND 50 <br /> Hexane ND 50 <br /> LCS OG31024-B S 1 <br /> Methane 7/27/00 989 1150 mg/I 80-120 116 <br /> Butane 985 1410 80-120 143 1 <br /> Propane 1010 1110 80-120 110 <br /> Et 1000 1130 80-120 113 <br /> P <br /> 973 1170 80-120 120 <br /> AHe a 961 1390 80-120 145 1 <br /> [.CS Dup OG31024-BSD1 <br /> Methane 7127/00 989 1170 mg/1 80-120 118 30 172 <br /> Butane 985 1440 80-120 146 30 211 1 <br /> Propane 1010 1130 80-120 112 30 179 <br /> Ethane " 1000 1160 to 80-120 116 30 262 <br /> Pentane 973 1190 80-120 122 30 169 1 <br /> Hexane 961 1420 80-120 148 30 214 1 <br /> u licate OG31024-DUP1 5006407-01 <br /> Methane 7127100 ND ND mg/l 30 <br /> Butane ND ND to30 <br /> Propane ND ND 30 <br /> Ethane ND ND 30 <br /> Pentane ND ND 30 <br /> Hexane ND ND 30 <br /> 40 <br /> Sequoia Analytical-Sacramento *Refer to end ojreporl for next of notes and def rasions <br /> page 7of8 <br />