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819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequotalabs cam <br /> OSECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 Project Nurnber 2093,Tracy,CA Repotted <br /> Rancho Cordova CA,95670 Project Manager' Rusty Benkosky 04/01/02 18 44 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT-Quahty 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 2030308-EPA 5030B(P/T) <br /> Blank 2030308-BLK1 Prepared&Analyzed 03/22/02 <br /> Purgeable Hydrocarbons ND 50 119/1 <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate a aa-Trifluorotoluene 107 100 107 60-140 <br /> LCS(2030308-BS1) Prepared&Analyzed 03/22/02 <br /> Benzene 936 0 50 119/1 too 936 70-130 <br /> Toluene 104 0 50 100 104 70-130 <br /> Ethylbenzene 108 0 50 100 108 70-130 <br /> Xylenes(total) 31 7 0 50 300 106 70-130 <br /> 4tLDu <br /> aaa-Tr fluorotoluene 10 9 100 109 60-140(203030&SSDl) Prepared&Analyzed 03/22/02 <br /> Benzene 8 93 0 50 ug/1 100 893 70-130 470 25 <br /> Toluene 994 0 50 10 0 994 70-130 4 52 25 <br /> Ethylbenzene 103 0 50 " 100 103 70-130 474 25 <br /> Xylenes(total) 299 0 So " 300 997 70-130 5 84 25 <br /> Surrogate a a a-Trifluorotoluene 104 100 104 60-140 <br /> equola Analytical-Sacramento The results in this 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 8 of I i <br />