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North State Environmental Laboratory CA ELAP# 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 00-0307 <br /> Client Western Geo-Engineers <br /> Project R603-Over Ex <br /> Date Reported 03/13/2000 <br /> Gasoline and BTEX by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> alyte Method Limit Unit Blank Recovery RPD T^ <br /> Gasoline 8015M 0 5 mg/Kg ND 96 1 <br /> Benzene 8020 005 mg/Kg ND 68 0 <br /> Ethylbenzene 8020 005 mg/Kg ND 105 0 <br /> Toluene 8020 005 mg/Kg ND 88 0 <br /> Xylenes 8020 010 mg/Kg ND 106 0 <br /> ELAP Cer if cate No 1753 <br /> Rev-ewe a d Approved <br /> John A Murphy, aboratory Director Page 2 of 2 <br />