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404 N Wiget Lame <br /> Sequoia Walnut Creek CA <br /> 94598 <br /> (925)988-9600-9600 <br /> 4D <br /> FAX(925)988-9673 <br /> Analytical www sequoialabs com <br /> I Gettler Ryan Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco#6981 Reported <br /> Dublin CA,94568 Project Manager Scott Polston 02-Jan-01 I8 17 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch OL14004-EPA 5030B [P/TJ <br /> Blank(OL14004-BLK1) Prepared&Analyzed 13-Dec-00 <br /> Purgeable Hydrocarbons ND 10 ingltn'Air <br /> Benzene ND 010 " <br /> Toluene ND 010 <br /> Ethylbenzene ND 010 <br /> lylenes(total) ND 0 10 j <br /> Methyl tert butvl ether ND 0 50 <br /> Surrogate a a a-Tnfluorotoluene 542 600 903 70-130 <br /> Blank(OL14004-BLK2) Prepared&Analyzed 14-Dec-00 <br /> Purgeable Hydrocarbons ND 10 rng1m'Air <br /> Benzene ND 010 <br /> O.enoND 010nzene ND 010 <br /> Xylenes(total) ND 0 10 <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate a,a a-Tn uorotoluene 544 600 907 70-130 <br /> Blank(OL14004-BLK3) Prepared&Analyzed 19-Dec-00 <br /> Purgeable Hydrocarbons ND 10 mg/m3 Air <br /> Benzene ND 0 10 <br /> Toluene ND 0 10 <br /> Ethylbenzene ND 010 <br /> Xylenes(total) ND 0 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate a a a-Tnfluorololuene 596 600 993 110-130 <br /> LCS(OL14004-BSI) Prepared 13-Dec-00 Analyzed 14-Dec-00 Q-01 <br /> i <br /> Benzene 1 02 0 10 mgim'Air 200 510 70-130 <br /> Toluene 101 0 10 200 505 70-130 <br /> Ethylbenzene 0 966 0 10 200 483 70-130 <br /> Yylenes(total) 290 0 10 600 483 70-130 <br /> Surrogate a a,a•Tnfluorotoluene 512 600 853 70-130 <br /> oia Analytical-Walnut Creek 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 8 <br />