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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical FAX equo alabs92 1 c 00 <br /> www sequotalabs com <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 03/01/01 15 10 <br /> Miscellaneous Analyses - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch IB16014- General Pre <br /> Blank(1BI6014-BLK1) _F Prepared 02/16/01 Analyzed 02/20/01 <br /> Methane ND 5 0 mg/1 <br /> Butane ND 5 0 " <br /> Propane ND 50 " <br /> Ethane ND 50 " <br /> Pentane ND 50 " <br /> Hexane ND 50 " <br /> LC_S(1816014-BSI) Prepared 02/16/01 Analyzed 02/20/01 <br /> Methane 1220 50 mg/l 989 123 65-135 <br /> Butane 1210 50 985 123 65-135 <br /> ane 1160 5 0 " 1010 115 65-135 <br /> e 1200 50 1000 120 65-135 <br /> Pentane 1030 50 973 106 65-135 <br /> Hexane 1040 50 961 108 65-135 <br /> _LCS Dup(1B16014-BSD1) Prepared 02/16/01 Analyzed 02/20/01 <br /> MethaneT 1150 50 mg/1 989 116 65-135 591 30 <br /> Butane 971 so 985 986 65-135 219 200 <br /> Propane 1060 5 0 1010 105 65-135 901 200 <br /> Ethane 1120 5 0 1000 112 65-135 690 200 <br /> Pentane 927 50 973 953 65-135 105 200 <br /> Hexane 858 50 961 893 65-135 192 200 <br /> Duplicate QIB16014-DUPI) _ Source 5102186-01 Prepared 02/16/01 Analyzed 02/20/01 <br /> Methane ND 5 0 mgfl ND 30 <br /> Butane ND 50 ND 30 <br /> Propane ND 50 ND 30 <br /> Ethane ND 50 ND 30 <br /> Pentane ND so ND 30 <br /> Hexane ND so ND 30 <br /> Ift <br /> quota Analytical - Sacramento 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 7 of 8 <br />