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819 Striker Avenue,Suite 8 <br /> hSequoia Sacramento,CA 95834 <br /> .:..: ; `i (916)921.9600. <br /> Analytical FAX(916)921-0100 <br /> www.sequoi2labs.com <br /> RS-Sac.Gateway Oaks Project: ARCO 548,Stockton,CA <br /> 2870 Gateway Oaks 17r.,Ste. 300 ProjectNurnber. 548,Stockton,CA Reported: <br /> Sacramento CA,45833 Project Manager. Vernon Elarth 07/09/0216:44 <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 /> Bateb 2060347-EPA 5030E(PIT) <br /> Blank(2060347-BLKl) Prepared&Analyzed:06/25/02 <br /> Purgeable Hydrocarbons ND 2.8 ppmv <br /> Benzene ND 0.016 " <br /> Toluene ND 0.013 " <br /> Ethylbmzene ND 0.012 " <br /> Xylenes(total) ND 0.012 " <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Trifluoro toluene 0.356 0.335 106 60-140 <br /> LCS(2060347-BSI) Prepared&Analyzed:06/25/02 <br /> Surrogate:a,a,a-Trifluorotoluene 0.364 ppmv 0.335 109 60-140 <br /> LCS Dup(2060347-BSDI) Prepared&Analvzed:06/25/02 <br /> rrogate:a,a,a-Triuomtoluene 0.338 ppmv 0.335 101 60-140 <br /> 4 equoia 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 />