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404 N Wiget Lane <br /> Sequoia Walnut Creek cA 94598 <br /> 15) (925)988-9000 <br /> Analytical wFAX(925)988-9673 <br /> VF ww sequolalabs corn <br /> Gettler Ryan, Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-6171 Reported: <br /> Dublin CA,94568 Project Manager Deanna L Harding 31-Jul-01 07 59 <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 1G20003-EPA 5030B P/T <br /> Blank(IG20003-BLKI) Prepared&Analyzed 20-Jul-01 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a,a-Trifluorotoluene 298 " 300 993 70-130 <br /> Blank(IG20003-BLK2) Prepared&Analyzed 23-Jul-01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050O <br /> " <br /> e ND 050 n <br /> nzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Triuorotoluene 287 300 95 7 70-130 <br /> Blank(1G20003-BLK3) Prepared&Analyzed 24-Jul-01 <br /> Purgeable Hydrocarbons ND 50 ugR <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 <br /> xylenes(total) ND 050 " <br /> Methyl tort-butyl ether ND 25 <br /> Surrogate a aa-Triuorotoluene 280 300 933 70-130 <br /> Blank(IG20003-BLK4) Prepared&Analyzed 25-Jul-01 <br /> Purgeable Hydrocarbons ND 50 ugll <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Triuorotoluene 284 300 947 70-130 <br /> �oia Analytical -Walnut Creek The results in this report apply to the samples analysed in accordance with the chain of <br /> custody document 77us analytical report must be reproduced in its entirety <br /> Page 10 of 18 <br />