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4d6North State Environmental Laboratory CA ELAP# 1753 <br /> ,190 South Spruce A%enue 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 99-1892 <br /> Client Western Geo-Engineers <br /> Project ARC Pump and Welding/ S French Tnpk Rd <br /> Date Reported 12/15/99 <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> �nalyte Method Limit Unit Blank Recovery RPD <br /> Gasoline 8015M 50 ug/L ND 100 1 <br /> Benzene 8020 0 5 ug/L ND 95 3 <br /> Ethylbenzene 8020 0 5 ug/L ND 106 0 <br /> Toluene 8020 0 5 ug/L ND 101 4 <br /> Xylenes 8020 1 0 ug/L ND 111 1 <br /> MTBE 8020 0 5 ug/L ND 86 4 <br /> ELAP Certificate NO 1753 <br /> "eviewed and Approved <br /> Page 2 of 2 <br /> Josn A Murphy, Labor ory Director <br />