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404 N Wiget Lane <br /> Sequoia Walnut Creek C894598 <br /> 4 (925) 988-9600 <br /> FAX(925)988-9673 <br /> a- ) Analytical www sequoialabs com <br /> Gettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco# 11192 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 10-May-01 17 06 <br /> BTEX+MTBE by EPA Method 8021B - Quality Control <br /> Great Lakes Analytical <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1050067-EPA 5030B(P/T) <br /> Blank(1050067-BLK1) Prepared&Analyzed 02-May-01 <br /> Benzene ND 0 500 ug/l <br /> Toluene ND 200 " <br /> Ethylbenzene ND 0 500 " <br /> Total Xylenes AFD 0 500 <br /> Methyl tent-butyl ether ND 0 500 " <br /> Surrogate 4-BFB 175 200 875 418-147 <br /> LCS(1050067-BSI) Prepared&Analyzed 02-May-01 <br /> Benzene 252 0 500 ugll 250 101 748-116 <br /> Toluene 260 0 500 250 104 759-116 <br /> 0Etq lbenzene 25 8 0 500 25 0 103 788-117 <br /> Xylenes 73 7 0 500 75 0 983 726-122 <br /> ethyl tert-butyl ether 23 9 0 500 250 956 732-123 <br /> Surrogate 4-BFB 184 200 920 418-147 <br /> Matrix Spike(1050067-MS1) Source B10502"2 Prepared 02-May-01 Analyzed 03-May-01 <br /> `Benzene - 22-4 0 500—ug/1-- —250 ND--89 6-34 2-160-- — - -- <br /> Toluene 227 0 500 250 ND 908 308-161 <br /> Ethylbenzene 229 0 500 250 ND 916 348-163 <br /> Total Xylenes 65 3 0 500 750 ND 871 329-160 <br /> Methyl tert-butyl ether 229 0 500 250 ND 912 100-282 <br /> Surrogate 4-BFB 171 200 855 418-147 <br /> Matrix Spike Dup (1050067-MSD1) Source B105028-02 Prepared 02-May-01 Analyzed 03-May-01 <br /> Benzene 248 0 500 ug/l 250 ND 992 342-160 10 2 370 <br /> Toluene 25 1 0 500 250 ND 100 309-161 964 273 <br /> Ethylbenzene 252 0 500 250 ND 101 348-163 976 28 0 <br /> Total Xylenes 721 0 500 750 ND 96 1 329-160 9 83 281 <br /> Methyl tert-butyl ether 251 0 500 250 ND 100 100-282 921 794 <br /> Surrogate 4-BFB 191 200 955 418-147 <br /> ola Analytical-Walnut Creek The 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 8 of 9 <br />