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Sequoia <br />Analytical <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <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 01/28/02 15:54 <br />Total Purgeable Hydrocarbons and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2010315 - EPA 5030B (MeOH <br />Blank (2010315-BLKI) <br />0.966 <br />Prepared & Analyzed: 01/24/02 <br />Purgeable Hydrocarbons <br />ND <br />5.0 mg/kg <br />Benzene <br />ND <br />0.050 " <br />Toluene <br />ND <br />0.050 " <br />Ethylbenzene <br />ND <br />0.050 " <br />Xylenes (total) <br />ND <br />0.050 " <br />Surrogate: a,a,a-Trifluorotoluene <br />0.966 <br />1.00 <br />96.6 <br />60-140 <br />LCS (2010315-BS1) <br />Prepared & Analyzed: 01/24/02 <br />Benzene <br />0.912 <br />0.050 <br />mg/kg 1.00 <br />91.2 <br />70-130 <br />Toluene <br />0.963 <br />0.050 <br />1.00 <br />96.3 <br />70-130 <br />Ethylbenzene <br />0.984 <br />0.050 <br />1.00 <br />98.4 <br />70-130 <br />Xylenes (total) <br />2.80 <br />0.050 <br />3.00 <br />93.3 <br />70-130 <br />Surrogate: a,a,a-Trifluorotoluene <br />0.955 <br />1.00 95.5 60-140 <br />LCS Dup (2010315-BSD1) <br />Prepared & Analyzed: 01/24/02 <br />Benzene <br />0.919 <br />0.050 <br />mg/kg 1.00 91.9 70-130 <br />0.765 <br />25 <br />Toluene <br />1.07 <br />0.050 <br />1.00 107 70-130 <br />10.5 <br />25 <br />Ethylbenzene <br />1.16 <br />0.050 <br />1.00 116 70-130 <br />16.4 <br />25 <br />Xylenes (total) <br />3.53 <br />0.050 <br />3.00 118 70-130 <br />23.1 <br />25 <br />Surrogate: a,a,a-Trifluorotoluene <br />Sequoia Analytical - Sacramento <br />0.860 <br />11 1.00 86.0 60-140 <br />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 5 of 7 <br />