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North State Environmental Laboratory C, LI-APS: 175, <br /> 90 South Spruce Avenue, Suite V • South San Francisco CA 94080 • (650) 266-4563 FAX (650) 266-4560 <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 00-0286 <br /> Client Western Geo-Engineers <br /> Project R603-OVER-EX <br /> Date Reported 03/10/2000 <br /> Gasoline and BTEX by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> �alyte Method Limit Unit Blank Recovery RPD <br /> Gasoline 8015M 0 5 mg/Kg ND 92 3 <br /> Benzene 8020 005 mg/Kg ND 69 2 <br /> Ethylbenzene 8020 005 mg/Kg ND 98 2 <br /> Toluene 8020 005 mg/Kg ND 86 3 <br /> Xylenes 8020 010 mg/Kg ND 98 3 <br /> ELAP Certificate NO 175 <br /> 41Pa�d Approved <br /> Page 3 of 3 <br /> John A Murphy, Laboratory Director <br />