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404 N WlgetLane <br /> Sequoia Walnut Creek CA 94548 <br /> (925)988-9600 � <br /> FAX(925)988-9673 <br /> Analyticalwww sequoialabs corn <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 27-Jul-01 10 47 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical _ Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch I G 12001 -EPA 5030B PIT <br /> Blank(I G 1200 1-BLK5) Prepared&Analyzed 19-Jul-01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl ten-butyl ether ND 25 " <br /> Surrogate a a a-Triuorotoluene 240 " 300 800 70-130 <br /> Blank(1G12001-BLK6) Prepared&Analyzed 20-Jul-Ol <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 050 • <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl ten-butyl ether ND 25 " <br /> Surrogate a a a-Triuorotoluene 292 300 973 70-130 <br /> Blank(1G12001-BLK7) Prepared&Analyzed 23-Jul-0I <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Surrogate a a,a-Trfluorotoluene 286 300 953 70-130 <br /> LCS(1G12001-BSI) Prepared&Analyzed 12-Jul-01 <br /> Benzene 200 0 50 ug/l 200 100 70-130 <br /> Toluene 198 0 50 200 990 70-130 <br /> Ethylbenzene 200 0 50 200 100 70-130 <br /> Xylenes(total) 566 0 50 600 94 3 70-130 <br /> Surrogate a a a-Triuorololuene 276 300 920 70-130 <br /> Sequoia Analytical -Walnut Creek The results in this report apply to the samples analyzed to accordance with the c <br /> custody document This analytical report must be reproduced in its ew <br /> Page 7 of 12 <br />