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North State Environmental Laboratory CA ELAP# 1753 <br /> . 90 South Spruce Avenue Suite V • South San Francisco CA 93080 • (650) 266-4563 FAX (650) 266-4560 <br /> CERTIFICATE OF ANALYSIS <br /> Quality Control/Quality Assurance <br /> Lab Number 00-0811 <br /> Client Western Geo-Engineers <br /> Pro3ect ARC PUMP & WELDING <br /> Date Reported 06/21/2000 <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> Analyte Method Limit Unit Blank Recovery RPD <br /> Z3asoline 8015M 50 ug/L ND 128 14 <br /> Benzene 8020 0 5 ug/L ND 101 2 <br /> Ethylbenzene 8020 0 5 ug/L ND 119 5 <br /> Toluene 8020 0 5 ug/L ND 109 0 <br /> Xylenes 8020 1 0 ug/L ND 125 11 <br /> MTBE 8020 0 5 ug/L ND 97 13 <br /> i <br /> I <br /> ELAP Certificate NO 1753 <br /> Re sewed and Approve <br /> Page 2 of 2 <br /> John A Murph aboratory Director <br />