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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,)9 95834 <br /> {916}921-9600 <br /> Analytical FAX(916)921-0100 <br /> lawwww sequoialabs coin <br /> SECOR International-Rancho Cordova Project ARCO 2133,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/24/02 18 09 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFr-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060149-EPA 5030B /'I <br /> Blank 2060149-BLKI Prepared&Anal zed 06/13/02 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether PID 25 " <br /> Surrogate a a a-Trifluorotoluene 102 100 102 60-140 <br /> LCS 2060149-BS1 Preeared&Anal 06/13/02 <br /> Benzene 8 91 050 u9A 10 0 89 70-130 <br /> Toluene 101 050 10 0 101 70-130 <br /> Ethylbenzene 107 050 10 0 107 70-130 <br /> ylenes(total) 328 050 30 0 109 70-130 <br /> ethyl tert-butyl ether 8 82 2 5 10 0 88 70-130 i <br /> Surrogate a,a,a-Trifluorotoluene 11 1 100 111 60-140 <br /> Matrix Spike(2060149-MS1) Source 5206143-01 Prepared&Analyzed 06/13/02 <br /> Benzene 887 0 50 119/1 too ND 89 60-140 <br /> Toluene 10 1 050 100 ND 101 60-140 <br /> Ethylbenzene 107 050 100 ND 107 60-140 <br /> Xylenes(total) 33 1 0 50 300 ND 110 60-140 <br /> Methyl tert-butyl ether 926 25 100 ND 93 60-140 <br /> Surrogate a a a-Trifluorotoluene 113 100 113 60-140 <br /> Matrix Spike Dup(2060149-MSDI) Source 5206143-01 Prepared&Analyzed 06/13/02 <br /> Benzene 9 43 0 50 ug/l 100 ND 94 60-140 6 25 <br /> Toluene 10 8 0 50 100 ND 108 60-140 7 25 <br /> Ethylbenzene 114 0 50 100 ND 114 60-140 6 25 <br /> Xylenes(total) 35 2 0 50 300 ND 117 60-140 6 25 <br /> Methyl tert-butyl ether 102 2 5 " 100 ND 102 60-140 10 25 <br /> Surrogate a,a,a-Trifluorotoluene 112 100 112 60-140 <br /> quoia Analytical-Sacramento The results in thts report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 6 of 10 <br />