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Sequoia 404 N ,CA Lane <br /> Walnut Creels,CA 94598 <br /> 4 - (925)988-9600 <br /> fAX(925)988-9673 <br /> Analytical www sequolalabs com <br /> Gettler Ryan, Inc - Dublin Project Tosco <br /> 6747 Sierra Court Suite 1 Project Number Tosco 4 5886 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 06-Aug-01 13 15 <br /> MTBE by DHS LUFT <br /> Sequoia Analytical - Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> FB-LB(W107409-01)Water Sampled 19-Jul-01 00 00 Received 23-Jul-01 17 00 <br /> Aethyl tent-butyl ether _ ND_ _ 25 ugA 1 1G30004 30-Jul-01 30-Jul-01 DHS LUFT Q-23 <br /> Surrogate a a,a-Trrhuorotoluene _967% 70-130 " <br /> VIW-1 (W107409-02)Water Sampled 19-Jul-01 13 25 Received 23-Jul-01 17 00 <br /> Methyl tert-butyl ether ND 25 ug/l 1 1G30004 30-Jul-01 30-Jul-01 DHS LUFT Q-23 <br /> Surrogate a a,a-Trifluorotoluene 917% 70-130 <br /> MW-2(W107409-03)Water Sampled 19-Jul-01 12 46 Received 23-Jul-01 17 00 <br /> Methyl tert-butyl ether 1100 250 ugA 100 �IG30004 02-Aug-01 02-Aug-01 DHS LUFT _ Q-23a <br /> Surrogate a,a a-Trifluorotoluene 997% 70-130 <br /> MW-3(W107409-04)Water Sampled 19-Jul-01 14 06 Received 23-Jul-01 17 00 <br /> Methyl tert-butyl ether_ _ 8700a 1200 ug/1 500 IG30004 30-Jul-01 30-Jul-01 DHS LUFT _ Q_23 <br /> Surro ate a a a-Tris luorotoluene 950% 70-130 <br /> M (W107409-05)Water Sampled 19-Jul-01 1051 Received 23-Jul-01 17 00 <br /> Methyl tert-butyl ether _ _ 88 �2 5 _-ugA I IG30004 30-Jul-01 30-Jul-01_ DHS LUFT- -Q-23,QR-04 <br /> Surrogate a,a a-Trifluorotoluene 783% 70-130 " <br /> MW-4D(W107409-06)Water Sampled 19-Jul-01 10 20 Received 23-Jul-01 17 00 <br /> Methyl Cert-butyl ether _ _ 17 25 ug/1 I IG30004 30-Jul-01 30-Jul-01 DHS LUFT Q-23 <br /> .Surrogate aa,a-Trifluorotoluene 963% 70-130 <br /> MW-6S(W107409-07)Water Sampled 19-Jul-01 12 03 Received 23-Jul-01 17 00 <br /> Methyl tert-butyl ether 15 _ 25 _ ug/1 I _IG30004 30-Jul-01 30-Jul-01 DHS LUFT Q-23 <br /> Surrogate a,a a-Trtuorotoluene 943% 70-130 <br /> Set Analytical -Walnut Creek ne 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 2 of 7 <br />