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404 N Wiget lane <br /> Sequoia Walnut Creek CA 94598; <br /> (925)988-9600 <br /> FAX (925)988-9673 <br /> Analytical www sequoialabs co <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-6258 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 30-Apr-01 11 39 <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 %RBC Lits RPD Limit Notes <br /> Batch 1040414-EPA 5030B(PIT) Limits <br /> Blank(1040414-BLKI) Prepared&Analyzed 22-Apr-01 <br /> Benzene ND 0 500 ug1l <br /> Toluene ND 200 <br /> Ethylbenzene ND 0 500 " <br /> Total Xylenes ND 200 <br /> Methyl tert-butyl ether ND 0 500 " <br /> Surrogate 4-BFB 186 200 930 860-142 <br /> LCS(1040414-BSI) Prepared 22-Apr-01 Analyzed 23-Apr-Ol <br /> Benzene 22 1 0 500 ug/l 25 0 884 85 0-115 <br /> Toluene 240 0 500 25 0 960 850-115 <br /> Ethylbenzene 252 0 500 25 0 101 85 0-115 <br /> Total Xylenes 727 0 500 750 969 850-115 <br /> Methyl tert-butyl ether 234 0 500 25 0 936 850-115 <br /> Surrogate 4-BFB 198 200 990 860-142 <br /> Matrix Spike(1040414-MSI) Source B104246-03 Prepared 22-Apr-01 Analyzed 24-Apr-Ol <br /> Benzene 232 0 500 ug/l 25 0 ND 92 8 74 3 134 <br /> Toluene 248 0 500 250 0 763 96 1 638-141 <br /> Ethylbenzene 257 0 500 250 ND 103 643-140 <br /> Total Xylenes 746 0 500 750 ND 995 676-143 <br /> Methyl tent-butyl ether 25 1 0 500 250 ND I00 672-157 <br /> Surrogate 4-BFB 193 200 965 860-142 <br /> Matrix Spike Dup(1040414-MSDI) Source B104246-03 Prepared 22-Apr-01 Analyzed 24 Apr-01 <br /> Benzene 237 0 500 ug/1 250 ND 94 8 743-134 2 13 211 <br /> Toluene 246 0 500 25 0 0 763 95 3 63 8-141 0 836 175 <br /> Ethylbenzene 25 7 0 500 250 ND 103 643-140 0 175 <br /> Total Xylenes 750 0 500 75 0 ND 100 676-143 0 501 176 <br /> Methyl tert-butyl ether 250 0 500 25 0 ND 100 672-157 0 279 <br /> Surrogate 4-BFB 191 200 960 860-142 <br /> Sequoia Analytical-Walnut Creek The results in tins report apply to the samples analyzed in accordance with the chcn <br /> custody document This analytical report must he reproduced in its entire <br /> Page 9 of 11 <br /> ,rte, <br />