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Sequoia <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />® <br />(916) 921-9600 <br />A <br />Anah tical <br />FAX (916) 921-0100 <br />Benzene <br />www.sequoialabs.com <br />Delta Environmental Consultants (Cameron Park) Project: Arco 6100, Tracy, CA <br />3330 Cameron Park Dr. Ste 550 Project Number: Arco 6100, Tracy, CA Reported: <br />Cameron Park CA, 95682 Project Manager: Jay Johnson 01/24/02 17:22 <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 />Batch 2010298 - EPA 5030B (P/T <br />Blank (2010298-BLKI) <br />Prepared & Analyzed: 01/23/02 <br />Purgeable Hydrocarbons <br />ND <br />0.50 mg/kg <br />Benzene <br />ND <br />0.0050 " <br />Toluene <br />ND <br />0.0050 " <br />Ethylbenzene <br />ND <br />0.0050 " <br />Xylenes (total) <br />ND <br />0.0050 " <br />Methyl tert-butyl ether <br />ND <br />0.0050 " <br />Surrogate: a,a,a-Trifluorotoluene <br />0.0169 <br />0.0200 84.5 60-140 <br />LCS (2010298 -BSI) <br />Prepared & Analyzed: 01/23/02 <br />Benzene <br />0.0188 <br />0.0050 mg/kg <br />0.0200 <br />94.0 <br />70-130 <br />Toluene <br />0.0176 <br />0.0050 <br />0.0200 <br />88.0 <br />70-130 <br />Ethylbenzene <br />0.0184 <br />0.0050 <br />0.0200 <br />92.0 <br />70-130 <br />Xylenes (total) <br />0.0525 <br />0.0050 <br />0.0600 <br />87.5 <br />70-130 <br />Methyl tert-butyl ether <br />0.0187 <br />0.0050 <br />0.0200 <br />93.5 <br />70-130 <br />Surrogate: a,a,a-Trifluorotoluene <br />0.0171 <br />0.0200 <br />85.5 <br />60-140 <br />Matrix Spike(2010298-MS1) <br />Source: S201309-19 <br />Prepared & Analyzed: 01/23/02 <br />Benzene <br />0.0183 <br />0.0050 mg/kg <br />0.0200 <br />ND <br />91.5 <br />60-140 <br />Toluene <br />0.0167 <br />0.0050 <br />0.0200 <br />ND <br />83.5 <br />60-140 <br />Ethylbenzene <br />0.0174 <br />0.0050 <br />0.0200 <br />ND <br />87.0 <br />60-140 <br />Xylenes (total) <br />0.0494 <br />0.0050 <br />0.0600 <br />ND <br />82.3 <br />60-140 <br />Methyl tert-butyl ether <br />0.0199 <br />0.0050 <br />0.0200 <br />ND <br />99.5 <br />60-140 <br />Surrogate: a,a,a-Tris luorotoluene <br />0.0164 <br />0.0200 <br />X3.0 <br />60-140 <br />Matrix Spike Dup (2010298-MSD1) <br />Source: S201309-19 <br />Prepared & Analyzed: 01/23/02 <br />Benzene <br />0.0197 <br />0.0050 mg/kg <br />0.0200 <br />ND <br />98.5 <br />60-140 <br />7.37 25 <br />Toluene <br />0.0185 <br />0.0050 <br />0.0200 <br />ND <br />92.5 <br />60-140 <br />10.2 25 <br />Ethylbenzene <br />0.0189 <br />0.0050 <br />0.0200 <br />ND <br />94.5 <br />60-140 <br />8.26 25 <br />Xylenes (total) <br />0.0541 <br />0.0050 <br />0.0600 <br />ND <br />90.2 <br />60-140 <br />9.08 25 <br />Methyl tert-butyl ether <br />0.0198 <br />0.0050 <br />0.0200 <br />ND <br />99.0 <br />60-140 <br />0.504 25 <br />Surrogate: a,a,a-Trifluorotoluene <br />0.0182 <br />0.0200 <br />91.0 <br />60-140 <br />Sequoia 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 />