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4 <br /> 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> tz)11 (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> fn <br /> nvironmentalConsultants(Cameron Park) P%lect Arco 6100,Tracy,CA <br /> 3meronParkDrSte550 ProjectNumber Arco 6100,Tracy,CA Reported <br /> Can Park CA,956$2 Project Manager Jay Johnson 01/24/02 17 22 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE 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 2010298-EPA 5030B P/T <br /> Blank(2010298-BLKI) Prepared&Analyzed 01/23/02 _ <br /> Purgeable Hydrocarbons ND 050 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 <br /> Xylenes(total) ND 00050 <br /> Methyl tert-butyl ether ND 00050 <br /> Surrogate a a a-Trifluorotoluene 00169 00200 84 5 60-140 <br /> LCS(2010298-BS1) Prepared&Analyzed 01/23/02 <br /> Benzene 0 0188 00050 mg/kg 00200 940 70-130 <br /> Toluene 0 0176 00050 00200 88 0 70-130 <br /> Ethylbenzene 00184 00050 00200 92 0 70-130 <br /> Genes(total) 0 0525 00050 0 0600 87 5 70-130 <br /> hyi Cert-butyl ether 0 0187 00050 0 0200 93 5 70-130 - <br /> Surrogate a a a-Trifluorotoluene 0 0171 00200 85 5 60-140 <br /> Matrix Spike(2010298-MSI) Source 5201309-19 Prepared&Analyzed 01/23/02 <br /> Benzene 00183 00050 mg/kg 00200 ND 91 5 60-140 <br /> Toluene 00167 00050 00200 ND 83 5 60-140 <br /> Ethylbenzene 00174 00050 00200 ND 87 0 60-140 <br /> Xylenes(total) 00494 00050 00600 ND 82 3 60-140 <br /> Methyl tert-butyl ether 00199 00050 00200 ND 99 5 60-140 <br /> Surrogate a a a-Trifluorotoluene 00164 00200 82 0 60-140 <br /> Matrix Spike Dup(2010298-MSD/) Source S20_1309-19 Prepared&Analyzed 01/23/02 _ <br /> Benzene 00197 00050 mg/kg 00200 ND 98 5 60-140 7 37 25 <br /> Toluene 00185 00050 00200 ND 92 5 60-140 102 25 <br /> Ethylbenzene 00189 00050 00200 ND 94 5 60-140 8 26 25 <br /> i <br /> Xylenes(total) 00541 00050 00600 ND 90 2 60-140 9 08 25 <br /> Methyl tert-butyl ether 00198 00050 00200 ND 99 0 60-140 0 504 25 <br /> Surrogate a a a-Trtfluorotoluene 00182 00200 91 0 60-140 <br /> uota 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 4 of 6 <br />