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North State Environmental Laboratory CA FLAP#H53 <br /> 90 South Spruce Avenue, Suite V • South San Francisco, CA 94080 • (650) 2664563 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 00-0311 <br /> Client Western Geo-Engineers <br /> Project R603-Over Ex <br /> Date Reported 03/16/2000 <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Lead by Method 7420, AA Spectroscopy <br /> Reporting Avg MS/MSD <br /> Analyte Method Limit Unit Blank Recovery RPD <br /> oline 8015M 0 5 mg/Kg ND 88 2 <br /> Venzene <br /> 8020 005 mg/Kg ND 64 3 <br /> Ethylbenzene 8020 005 mg/Kg ND 100 3 <br /> Toluene 8020 005 mg/Kg ND 83 4 <br /> Xylenes 8020 010 mg/Kg ND 101 3 <br /> MTBE 8020 050 mg/Kg ND 86 5 <br /> Lead 7420 1 0 mg/Kg ND 111/110 1 <br /> ELAP Certificate NO 1753 <br /> Revae ed and A r v <br /> John A Murphy,Lab story Director Page 2 of 2 <br />