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819 Striker Avenue Suite 8 <br /> Sequoia <br /> (i) Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921-0100 <br /> NqMW www sequoialabs corn <br /> SECOR International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Protect Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 05/09/02 16 02 <br /> Total Purgeable Hydrocarbon, BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %RFC RPD <br /> [Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050081-EPA 50308 P/T <br /> Blank 2050081-BLKI Prepared&Analyzed 05/07/02 <br /> Purgeable Hydrocarbons ND 050 mg/kg <br /> Benzene ND 0 0050 " <br /> Toluene ND 0 0050 " <br /> Ethylbenzene ND 0 0050 " <br /> Xylenes(total) ND 0 0050 <br /> Methyl tert-butyl ether ND 0 0050 " <br /> Surrogate a a a-Trifluorotoluene 00205 00200 102 60-140 <br /> LCS(2050081-BS1) Prepared&Analyzed 05/07/02 <br /> Benzene 0 0213 0 0050 mg/kg 0 0200 106 70-130 <br /> Toluene 00201 0 0050 0 0200 100 70-130 <br /> Ethylbenzene 0 0212 0 0050 0 0200 106 70-130 <br /> Xylenes(total) 00609 0 0050 00600 102 70-130 <br /> ethyl tert-butyl ether 0 0199 0 0050 0 0200 100 70-130 <br /> Surrogate a a a-Trifluorololuene 00203 00200 102 60-140 <br /> LCS Dup(2050081-BSD1) Prepared&Analyzed 05/07/02 <br /> Benzene 0 0220 0 0050 mg/kg 0 0200 110 70-130 3 25 <br /> Toluene 0 0211 0 0050 0 0200 106 70-130 5 25 <br /> Ethylbenzene 00217 0 0050 00200 108 70-130 2 25 <br /> Xylenes(total) 00632 0 0050 0 0600 105 70-130 4 25 <br /> Methyl tert-butyl ether 0 0206 0 0050 0 0200 103 70-130 3 25 <br /> Surrogate a a a-Trifluorotoluene 00221 00200 110 60-140 <br /> 0equoia 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 to its entirety <br /> Page Page 4 of 6 <br />