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North State Environmental Laboratory <br /> CA ELAP# 1753 <br /> 90 South Spruce A,enue Suite V • South San Francisco CA 94080 (650) 266-4563 • FAX <br /> -(650) 266 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> Quality Control/Quality Assurance <br /> Lab Number 00-1832 <br /> Client Western Geo-Engineers <br /> Pro3 ect SANCHEZ <br /> Date Reported 12/19/2000 <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> Analyte Method Limit Unit Blank Recovery RPD <br /> Q <br /> soline 8015M 50 ug/L ND 117 2 <br /> nzene 8020 0 5 ug/L ND 89 1 <br /> Toluene $020 0 5 ug/L ND 89 3 <br /> Ethylbenzene 8020 0 5 ug/L ND 89 1 <br /> Xylenes 8020 1 0 ug/L ND 90 1 <br /> MTBE 8020 0 5 ug/L ND 89 6 <br /> ELAP Certificate NO 1753 <br /> Rev we and pyo ed <br /> r/ ' <br /> John A Murphy,La ratory Director Page 3 of 3 <br />