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North State Environmental Laboratory CA FLAP# 1753 <br /> 90 South Spruce Avenue, Suite V • South San Francisco, CA 94080 • (650) 266-4563 FAX (650) 266-4560 <br /> CERTIFICATE OF ANALYSIS <br /> Quality Control/Quality Assurance <br /> Lab Number 00-0296 <br /> Client Western Geo-Engineers <br /> Project R603-OVER EXCAVATION <br /> Date Reported 03/08/2000 <br /> Gasoline and BTEX by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> alyte Method Limit Unit Blank Recovery RPD <br /> Cyct sol-Li e 8015M 0 5 mg/Kg ND 91 1 <br /> Benzene 8020 005 mg/Kg ND 71 1 <br /> Ethylbenzene 8020 005 mg/Kg ND 103 2 <br /> Toluene 8020 005 mg/Kg ND 87 2 <br /> Xylenes 8020 010 mg/Kg ND 104 2 <br /> FLAP Certificate NO 1753 <br /> .akevzewed an p rov d <br /> r <br /> Page 4 of 4 <br /> John A Murphy, aboratory Director <br />