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North State Environmental <br /> Chemical Waste Disposal Trucking Consulting <br /> CERTIFICATE OF ANALYSIS <br /> Quality Control/Quality Assurance <br /> Lab Number: 98-977 <br /> Client - Western Geo-Engineers <br /> Project: R603 <br /> Date Reported 08/24/98 <br /> Diesel Range Hydrocarbons by Method 8015M <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Reporting MS/MSD <br /> Analyte Method Limit Unit Blank Recovery RPD <br /> soline 8015M 50 ug/L <br /> �ND �12nzene $020 0 . 5 ug/L 6 <br /> Ethylbenzene 8020 0 . 5 ug/L ND 94 5 <br /> Toluene 8020 0 . 5 ug/L ND 93 5 <br /> Xylenes 8020 1 0 ug/L ND 91 2 <br /> MTBE 8020 0 . 5 ug/L ND 111 1 <br /> Diesel 8015M 0 . 05 mg/L ND 72 7 <br /> ELAP Certificate NO 1753 <br /> Reviewed and Approved <br /> Page 2 of 2 <br /> John A Murphy,Laboratory Director <br /> P 0 Bax 5624 - South San Francisco, California 94083 - 650 -588 -2838 FAX 588 - 1950 <br />