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404 N Wrget Lane <br /> Sequoia Walnut Creek C94598 <br /> 4 a- ) (925) 988 8-9600 <br /> FAX (925) 988-9673 <br /> Analytical www sequolalabs com <br /> aw <br /> Gettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco 9 11192 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 10-May-01 10 33 <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(PIT) <br /> Blank(1050067-BLKI) Prepared&Analyzed 02-May-O 1 <br /> Benzene ND 0 500 ugll <br /> Toluene ND 200 " <br /> Ethylbenzene ND 0 500 <br /> Total Xvlenes ND 0 500 " <br /> Methyl tert-butyl ether ND 0 500 " <br /> Surrogate 4-BFB 175 200 875 418-147 <br /> LCS (1050067-BSI) Prepared&Analyzed 02-May-03 <br /> Benzene 252 0 500 ug/! 25 0 101 748-116 <br /> Toluene 260 0 500 250 104 759-116 <br /> Ethylbenzene 25 8 0 500 250 103 788-117 <br /> 9 <br /> Xylenes 737 0 500 75 0 98'3 7,26-122 <br /> yi lert-butyl ether 239 0 500 250 95 6 732-123 <br /> Surrogate 4 BFB 184 200 920 418-147 <br /> Matrix Spike(1050067-MSI) Source W104573-02 Prepared 02-May-01 Analyzed 03-May-01 <br />—Benzene ----- -----— -- <br /> 22-4--0-5 ougll 34 2-160 <br /> Toluene 22 7 0 500 25 0 ND 908 308-161 <br /> Ethylbenzene 229 0 500 250 ND 91 6 349-163 <br /> i <br /> Total Xylenes 65 3 0 500 750 ND 871 329-160 <br /> Methyl tett-butyl ether 228 0 500 250 ND 912 t0 0-282 <br /> Surrogate 4 BFB 171 200 855 418-147 <br /> Matrix Spike Dup (1050067-MSD1) Source W104573-02 Prepared 02-May-01 Analyzed 03-May-01 <br /> Benzene 248 0 500 ug/l 250 ND 992 342-160 102 370 <br /> Toluene 25 1 0 500 250 ND 100 308-161 964 273 <br /> Ethylbenzene 252 0 500 250 ND 101 348-163 976 28 0 <br /> Total Xylenes 721 0 500 750 ND 96 1 329-160 983 281 <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 inthis report apply to the sainples analyzed in accordance with the chart of <br /> custody document This analytical report trust be reproduced in its eutiretj <br /> Page 10 of 11 <br /> r� <br />