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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.corn <br /> Ila Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number: 548,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager. Jay Johnson 04/12/02 16:58 <br /> Total Purgeable Hydrocarbons, BTEX,and MTBE in Air(ppmv)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 2040085-EPA 5030B(PIT) <br /> Blank(2040085-BLKI) Prepared&Analyzed:04/03/02 <br /> Purgeable Hydrocarbons ND 2.8 ppmv <br /> Benzene ND 0.016 " <br /> Toluene ND 0.013 " <br /> Ethylbenzene ND 0.012 " <br /> Xylenes(total) ND 0.012 " <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Trifluorotoluene 0.350 0.335 104 60-140 <br /> LCS(2040085-BS1) Pre ared&Analyzed:04/03/02 <br /> Surrogate:a,a,a-Trifluorotoluene 0.361 ppmv 0.335 108 60-140 <br /> LCS Dup(2040085-BSDI) _ Prepared&Analyzed:04/03/02 <br /> rogate:a,a,a-Trifluorotoluene 0.358 ppmv 0.335 107 60-140 <br /> uoia 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 5 of 6 <br />