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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 /> 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 00-1416 <br /> Client Western Geo-Engineers <br /> Project ARC Pump & Weld <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 /> olrne 8015M 50 ug/L ND 119 4 <br /> Benzene 8020 0 . 5 ug/L ND ill 9 <br /> Toluene 8020 0 . 5 ug/L ND 112 8 <br /> Ethylbenzene 8020 0 5 ug/L ND ill 9 <br /> Xylenes 8020 1 0 ug/L ND 112 8 <br /> MTBE 8020 0 5 ug/L ND 125 2 <br /> ELAP Certificate No 1753 <br /> Reviewed nd Appro ed <br /> r <br /> Page 2 of 2 <br /> John A Murphy, La oratory Director <br />