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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 01/23/02 11:25 <br />Total Purgeable Hydrocarbons and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source °/uREC RPD <br />Analytc Result Limit Units Level Result %REC Limits RPD Limit Noir, <br />Batch 2010265 - EPA 5030B (MeOH <br />Blank (2010265-BLK1) <br />Prepared & Analyzed: 01/21/02 <br />Purgeable Hydrocarbons <br />ND <br />5.0 mg/kg <br />Benzene <br />ND <br />0.025 " <br />Toluene <br />ND <br />0.025 " <br />Ethylbenzene <br />ND <br />0.025 " <br />Xylenes (total) <br />ND <br />0.025 <br />Surrogate: a,a,a-Tris luorotoluene 0.937 111.00 93.7 60-140 <br />LCS (2010265-BS1) <br />Prepared & Analyzed: 01/21/02 <br />Prepared & Analyzed: 01/21/02 <br />Benzene <br />0.959 <br />0.025 <br />mg/kg 1.00 95.9 70-130 <br />Toluene <br />1.10 <br />0.025 <br />1.00 110 70-130 <br />Ethylbenzene <br />1.19 <br />0.025 <br />1.00 119 70-130 <br />Xylenes (total) <br />3.44 <br />0.025 <br />3.00 115 70-130 <br />Surrogate: a,a,a-Tris luorotoluene 1.01 111.00 101 60-140 <br />LCS Dup (2010265-BSDl) <br />Prepared & Analyzed: 01/21/02 <br />Prepared & Analyzed: 01/21/02 <br />ND <br />0.50 mg/kg <br />Benzene <br />0.902 <br />0.025 <br />mg/kg 1.00 90.2 70-130 <br />6.13 <br />25 <br />Toluene <br />1.06 <br />0.025 <br />1.00 106 70-130 <br />3.70 <br />25 <br />Ethylbenzene <br />1.14 <br />0.025 <br />1.00 114 70-130 <br />4.29 <br />25 <br />Xylenes (total) <br />3.51 <br />0.025 <br />3.00 117 70-130 <br />2.01 <br />25 <br />Surrogate: a,a,a-Trifluorotoluene 0.907 111.00 90.7 60-140 <br />Batch 2010267 - EPA 5030B (P/T) <br />Blank (2010267-BLK1) <br />Prepared & Analyzed: 01/21/02 <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 />Surrogate: a,a,a-Tri luorotoluene 0.0169 " 0.0200 84.5 60-140 <br />Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. This analytical report must be reproduced in its entirety. <br />Page Page 12 of 17 <br />