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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: 98-305 <br />Client: Semco <br />Project: Corral Hollow Rd. <br />Date Reported: 03/30/98 <br />Diesel Range Hydrocarbons by Method 8015 M <br />Gasoline,BTEX and MTBE by Methods 8015M and 8020 <br />Fuel Additives by GC/MS Method 8260 <br />Lead by Method 7420,AA Spectroscopy <br />Analyte <br />Method <br />Reporting <br />Limit <br />Unit <br />Blank <br />MS/MSD <br />Recovery <br />RPD <br />Diesel <br />8015M <br />1.0 <br />mg/Kg <br />ND <br />77 <br />14 <br />Lead <br />7420 <br />2 <br />mg/Kg <br />ND <br />98/101 <br />3 <br />Gasoline <br />8015M <br />0.5 <br />mg/Kg <br />ND <br />110 <br />17 <br />Benzene <br />8020 <br />.005 <br />mg/Kg <br />ND <br />101 <br />5 <br />Ethylbenzene <br />8020 <br />.005 <br />mg/Kg <br />ND <br />109 <br />10 <br />Toluene <br />8020 <br />.005 <br />mg/Kg <br />ND <br />108 <br />8 <br />Xylenes <br />8020 <br />.010 <br />mg/Kg <br />ND <br />106 <br />8 <br />MTBE <br />8020 <br />.005 <br />mg/Kg <br />ND <br />87 <br />1 <br />ELAP Certificate NO:1753 <br />Reviewed <br />p roved <br />John A.Murphy,Laboratory Director <br />Page 33 of 33 <br />P. 0. Boz 5624 a South San Francisco, California 94083 • 650-588-2838 FAX 588-1950 <br />