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404 N Wiget Lane <br /> Sequoia Walnut Geek CA 94598 <br /> (925)9W9600 <br /> 25)9W <br /> Analytical www sFAX quoiaabs labs c 73 <br /> equocoin <br /> r Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco SS# 5886 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 26-Feb-01 07 38 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Wye Result Lunit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1B09007-EPA 50308 [PI'T] <br /> US(1B09007-BSI) Prepared&Analyzed 09-Feb-01 <br /> Methyl tett-butyl ether 453 20 ug/l 500 906 70-130 <br /> Surrogate Drbromojluoromethane 53 0 <br /> 500 106 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 460 Soo 920 50-150 <br /> LCS(1B09007-BS2) Prepared&Analyzed 12-Feb-01 <br /> Methyl tert-butyl ether 436 20 ug/l 500 872 70-130 <br /> Surrogate Dibromofluoromethane 530 500 106 50-150 <br /> Surrogate 1 2-Drchloroelhane-d4 430 Soo 860 50-150 <br /> US(IB09007-BS3) Prepared&Analyzed 12-Feb-01 <br /> Methyl tent-butyl ether 201 20 ug/I 250 804 70-130 <br /> Surrogate Dibromofluoromethane 220 250 88 0 50-150 <br /> Surrogate 12-Dichloroethane-d4 190 250 760 50-150 <br /> Spike(1B09007-MSI) Source WI02176-03 Prepared&Analyzed 09-Feb-01 <br /> Methyl tent-butyl ether 515 2 0 ug/1 500 ND 103 60-150 <br /> Surrogate Dibromofluoromethane 510 Soo 104 50-150 <br /> Surrogate 12-Drchloroethane-d4 410 500 820 50.150 <br /> Matrix Spike Dup (1B09007-MSDI) Source WI02176-03 Prepared&Analyzed 09-Feb-01 <br /> Methyl tert-butyl ether S 1 6 20 ugll 500 ND 103 60-150 0 194 25 <br /> Surrogate Dibromofluoromethane 540 500 108 50-150 <br /> Surrogate 1 1-Drehloroerhane-d4 430 500 860 50-150 <br /> Sequoia Analytical-Walnut Creek The results m this report apply to the sranples mtalyred to accordance with the chant of <br /> custody document Thus wralyhcal report must be reproduced in is entirety <br /> Page 7 of 10 <br />