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North State Environmental Laboratory CA ELAP# ]753 <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 00-0253 <br /> Client Western Geo-Engineers <br /> Project Sanchez <br /> Date Reported 03/02/2000 <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> -7% yte Method Limit Unit Blank Recovery RPD <br /> Gasoline 8015M 50 ug/L ND 96 2 <br /> Benzene 8020 0 . 5 ug/L ND 104 3 <br /> Ethylbenzene 8020 0 . 5 ug/L ND 104 2 <br /> Toluene 8020 0 5 ug/L ND 102 2 <br /> Xylenes 8020 1 0 ug/L ND 97 2 <br /> MTBE 8020 0 . 5 ug/L ND 108 6 <br /> FLA4anA <br /> 1753 <br /> �evd <br /> Page 3 of 3 <br /> John A Murphy, Laborato Director <br />