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ad Sequoia an CarlosCAlR 70 a— ) (650) �'"�^ San Carlos CA 94070Analytical FAX 232-9600 (650)232 9612 www sNuoialabs cam Wr-Rya n/G costrategi es(1) Project Tosco(1) Sierra Court Suite J Project Number Tosco 45886,Stockton,CA Reported Dublin CA,94568 Project Manager Deanna Harding 11/02/01 15 13 MTBE by DHS LUFT Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Hatch Prepared Analyzed Method Notes TB-LB(L110131-01)Water Sampled 10/19/0100 00 Received 10/19/01 17 30 _ Methyl tent-butyl ether ND 50 ugA 1 1100127 10/29/01 10/30/01 DHS LUFT Surrogate aa a-Triuorotoluene 979% 60-140 " MW-1 (Ll 10131-02)Water Sampled 10/19/01 11 15 Received 10/19/01 17 30 Methyl tent-butyl ether ND - 50 ug/l 1 1100127 10129/01 10/29/01 DHS LUFT Surrogate a,a,a-Trifluorololuene 944% 60-140 IF IF MW-2(L110131-03)Water Sampled 10/19/01 13 45 Received 10119101.17 30 _ Methyl tert-butyl ether 2600 100 ugA 20 1100130 10/30/01 10/30/01 DHS LUFT Surrogate aa a-Triuorotoluene 860% 60-140 " IF MW-3(L110131-04)Water Sampled 10/19/01 13 05 Received 10/19/01 17 30 _ Methyl tert-butyl ether 2800. 100 ug/l 20 1100130 10/30/01 10/30/01 DHS LUFT Surrogate a,a,a-Trifluorololuene 797% 60-140 " IF -4S L110131-05 Water Sampled 10/19/01 10 00 Received 10/19/01 17 30 tent-butyl ether ND 50 _ugA 1 1100127 10/29/01 10/30/01 DHS LUFT Surrogate a,a,a-Trifluorotoluene 935% 60-140 " MW4D(LI10131-06)Water Sampled 10/191011035 Received 10/19/01 17 30 _ Methyl tert-butyl ether ND 50 ug/l 1 1100127 10/29/01 10/30/01 DHS LUFT Surrogate a,a,a-Tri luorotoluene 903% 60-140 MW-6S(L110131-07)Water Sampled 10/19/01 11 48 Received 10/19/01 17.30 Methyi tert-butyl ether ND 50 ugli 1 1100127 10/29/01 10/30/01 DHS LUFT Surrogate a,a,a-Trifluorololuene 929% 60-140 " 1a Analytical- San Carlos The results in this report apply to the samples analyzed to accordance with the thorn of custody document This analytical report must be reproduced in its entirely Page 2 of 6