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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: 6100, Tracy, CA Reported: <br />Cameron Park CA, 95682 Project Manager: Jay Johnson 02/20/02 16:47 <br />Total Purgeable Hydrocarbons and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />.nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2020149 - EPA 5030B (MeOH) <br />0.893 <br />Blank (2020149-BLKI) _ _ <br />LCS (2020149 -BSI) <br />Prepared & Analyzed: 02/13/02 <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-Tris luorotoluene <br />0.893 <br />1.00 89.3 60-140 <br />LCS (2020149 -BSI) <br />LCS Dup (2020149 -BSD]) <br />Prepared & Analyzed: 02/13/02 <br />Benzene <br />0.736 <br />0.050 <br />mg/kg 1.00 73.6 70-130 <br />Toluene <br />0.896 <br />0.050 <br />1.00 89.6 70-130 <br />Ethylbenzene <br />1.05 <br />0.050 <br />1.00 105 70-130 <br />Xylenes (total) <br />2.99 <br />0.050 <br />3.00 99.7 70-130 <br />Surrogate: a,a,a-Trifluorotoluene <br />0.825 <br />1.00 82.5 60-140 <br />LCS Dup (2020149 -BSD]) <br />Prepared & Analyzed: 02/13/02 <br />Benzene <br />0.848 <br />0.050 <br />mg/kg 1.00 84.8 70-130 <br />14.1 <br />25 <br />Toluene <br />1.03 <br />0.050 <br />1.00 103 70-130 <br />13.9 <br />25 <br />Ethylbenzene <br />1.20 <br />0.050 <br />1.00 120 70-130 <br />13.3 <br />25 <br />Xylenes (total) <br />3.43 <br />0.050 <br />3.00 114 70-130 <br />13.7 <br />25 <br />Surrogate: a,a,a-Trifluorotoluene 0.900 111.00 90.0 60-140 <br />Sequoia Analytical - Sacramento <br />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 4 of 6 <br />