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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 00-1415 <br /> Client Western Geo--Engineers <br /> Project Sanchez , Stockton <br /> Date Reported 10/10/2000 <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> Analyte Method Limit Unit Blank Recovery RPD <br /> ohne 8015M 50 ug/L ND 116 0 <br /> Benzene 8020 0 5 ug/L ND 111 0 <br /> Toluene 8020 0 5 ug/L ND 1.14 1 <br /> Ethylbenzene 8020 0 5 ug/L ND 114 0 <br /> Xylenes 8020 1 0 ug/L ND 120 1 <br /> MTBE 8020 0 5 ug/L ND 117 1 <br /> ELAP Certificate NO 1 53 <br /> w <br /> i we d Ap roved <br /> Page 3 of 3 <br /> John A Murp Laboratory Director <br />