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Sequoia Walnut N WiLane t Creek CAA 94598 (925) 988-99600 Analytical www 988-9673 sequequoiaiabs Gettler Ryan,Inc -Dublin Project Tosco 6747 Sierra Court Suite J Project Number Tosco# 11192 Report Revised Dublin CA,94568 Project Manager Doug Lee 04-Jun-01 08 49 BTEX+MTBE by EPA Method 8021B Great Lakes Analytical Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes B-7 (W104573-01)Water Sampled 24-Apr-01 00 00 Received 26-Apr-01 16 00 09 Benzene ND 0 500 ug/l 1 1050067 02-May-01 03-May-01 EPA 8021B Toluene ND 2 00 t. 1. " „ " Ethylbenzene ND 0 500 Total Xylenes ND 0 500 " Methyl tent-butyl ether 106 0 500 Surrogate 4-BFB 85 S% 418-147 B-8 (W104573-02)Water Sampled 24-Apr-01 00 00 Received 26-Apr-01 16 00 Benzene ND 0 500 ug/l 1 1050067 02-May-01 03-May-01 EPA 8021B Toluene ND 200 Ethylbenzene ND 0 500 " Total Xylenes ND 0 500 " Methyl tert-butyl ether ND 0 500 Surrogate 4-BFB 860% 418-147 " B-1 (W104573-03)Water Sampled 24-Apr-01 00 00 Received 26-Apr-01 16 00 Benzene ND 0 500 ugh 1 1050067 02-May-01 03-May-01 EPA 8021E Toluene ND 200 _--Ethylbenzene_ --_------- --0 815---_0 500 Total Xylenes 3 26 0 500 " Methyl tert-butyl ether 791 0 500 " Surrogate 4-BFB 86 5% 418-147 B-2 (W104573-04)Water Sampled 24-Apr-010000 Received 26-Apr-01 16 00 Benzene ND 0 500 ugh 1 1050067 02-May-01 03-May-01 EPA 8021B Toluene ND 2 00 ir Ethylbenzene ND 0 500 " Total Xylenes ND 0 500 Methyl tert-butyl ether 157 0 500 " Surrogate 4-BFB 830% 418-147 Sequoia Analytical- Walnut Creek This report represents a revision of the original document The results in this report ap to the samples analyzed in accordance with the churn of Custody document This Cmalyn rnl report must be reproduced in its entirety r C--TT arlie Westwater,Proje Mager Page 5 of 11 r94�