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404 N Wiget Lane <br /> Sequoia Walnut Creek C 94598 <br /> (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www sequoialabs corn. <br /> ION-0 <br /> Gettler Ryan,Inc -Dublin Project Tosca <br /> 6747 Sierra Court Suite 7 Project Number Cosco#6981 Reported <br /> Dublin CA,94568 Project Manager Scott Polston 08-Jan-Ol 1143 <br /> Total Purgeable Hydrocarbons (C6-C12)and BTEX in Air by DHS LUFT - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Litnits RPD Ltmnt Notes <br /> Batch IA02019-EPA 5030B [P/TJ <br /> LCS Dup(1A02019-BSDI) Prepared&Analyzed 21-Dec-00 Q-01 <br /> Benzene 137 0 010 mg/ml Air 200 685 65-120 636 25 <br /> Toluene 155 0 0 to 200 775 65-120 530 25 <br /> Ethylbenzene 133 0 010 200 665 65-120 725 25 <br /> Xylenes(total) 424 0 010 6 00 70 7 65-120 0 939 25 <br /> Surrogaie a a a-Trrr luorotoluene 500 600 833 70-130 <br /> oia Analytical-Walnut Creek The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in itr entirety <br /> Page 8 of 9 <br />