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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4D (916)921-%00 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11192,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/18/01 18 10 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT-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 /> I <br /> Batch 1.120145-EPA 5030B(PIT) <br /> Blank 1120145-BLK1 Prepared&Analyzed 12/11/01 <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 ND 25 " <br /> Surrogate a,a,a-Trifluorotoluene 109 100 109 60-140 <br /> LCS(1120145-BS1) - Prepared&Analyzed 12/11/01 <br /> Benzene 9 92 0 50 119/1 100 992 70-130 <br /> Toluene 9 58 0 50 100 95 8 70-130 <br /> Ethylbenzene 955 050 100 95 5 70-130 <br /> Xylenes(total) 28 8 050 300 960 70-130 <br /> Adkfethyl tert-butyl ether 103 25 10 0 103 70-130 <br /> Surrogate a a a-Trtfluorotoluene 115 100 115 60-140 <br /> LCS Dup(1120145-BSD1) Prepared&Analyzed 12/11/01 <br /> Benzene 948 0 50 ug/l 10 0 94 8 70-130 454 25 <br /> Toluene 906 050 10 0 906 70-130 5 58 25 <br /> Ethylbenzene 9 04 050 " 10 0 904 70-130 549 25 <br /> Xylenes(total) 274 050 30 0 91 3 70-130 498 25 <br /> Methyl tert-butyl ether 106 25 100 106 70-130 2 87 25 <br /> Surrogate a a a-Trtfluorotoluene 103 190 10.3 60-140 <br /> 46 quota 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 he reproduced in its entirety <br /> Page Page 8 of 10 <br />