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h <br /> 404 N Wiget Lane <br /> Walnut Creek reek c 94598 <br /> (925)988 8-96p0 <br /> FAX(925)9%-9073 <br /> Analytical www sequolalabs com <br /> 13�ettleeryyan,Inc -Dublin Project Tosca <br /> '747 Sierra Court Suite J Project Number Tosco#14409 Reported <br /> 7ublm CA,94568 Project Manager Deanna L Harding 06-Feb-01 17 21 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> ,nalyte Result Lunt Uruts Level Result %FEC Limits RPD Limit Notes <br /> etch IA24014-EPA 5030B[Pnq <br /> ,]auk(1A24014-BLKI) Prepared&Analyzed 24-Jan-01 <br /> b�'ol ND 500 vg/1 <br /> -t-Butyl alcohol ND 50 " <br /> ethyl tert-butyl ether ND 20 <br /> isopropyl ether ND 20 <br /> ar iyl tert-butyl ether ND 20 " <br /> t-Amyl methyl ether ND 20 <br /> 2-Dichloroethane ND 20 <br /> hylene dibrunude ND 20 " <br /> rrrogate Dibromofluoromethane 539 500 108 50.150 <br /> wrogate 1 2-Dichloroethane-d4 454 500 908 50-150 <br /> lank(1A24014-BLK2) Prepared&Analyzed 25-Jan-01 <br /> ND 500 ug/1 <br /> t-B Bohol ND 50 <br /> 'ethyl tent-butyl ether ND 20 " <br /> i-Isopropyl ether ND 20 " <br /> thyl Cert-butyl ether ND 20 " <br /> rt-Amyl methyl ether ND 20 " <br /> ,2-Dichlorodhane ND 20 <br /> thylene dibrorrude ND 20 " <br /> i lrrogate Dibromofluoromethane 583 Soo 117 50-150 <br /> ,arrogate 1 1Dichloroethane-d4 514 500 103 50.150 <br /> ,CS(1A24014-BSI) Prepared&Analyzed 24-Jan--01 <br /> Jtcthyl tert-butyl ether 527 20 ug/1 500 105 70-130 <br /> urrogate Dibromofluoromethane 540 500 108 50.150 <br /> surrogate 1 1-Drchlorvethane-d4 446 500 892 50-150 <br /> -,eq*Ana1ytical-Wahlut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.1 fus analytical report must be reproduced to its entirety <br /> Page 9of12 <br />