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$A10.North State Environmental <br />Chemical Waste Disposal • Trucking • Consulting <br />CERTIFICATE OF ANALYS I'S <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 />Result Unit <br />Date Sampled <br />Date Analyzed <br />Sample: <br />98-305-48 <br />Client ID: <br />D1-72 <br />03/18/98 <br />SOIL <br />Lead <br />7420 <br />8 <br />mg/Kg <br />03/23/98 <br />Sample: <br />98-305-49 <br />Client ID: <br />D2-72 <br />03/18/98 <br />SOIL <br />Gasoline 8015M <br />5.7 <br />mg/Kg <br />03/19/98 <br />Benzene <br />8020 <br />ND <br />Ethylbenzene 8020 <br />ND <br />MTBE <br />8020 <br />0.18 <br />mg/Kg <br />Toluene <br />8020 <br />ND <br />Xylenes <br />8020 <br />ND <br />Lead <br />7420 <br />7 <br />mg/Kg <br />03/24/98 <br />Diesel <br />8015M <br />1200 <br />mg/Kg <br />03/20/98 <br />Sample: <br />98-305-50 <br />Client ID: <br />D3-53 <br />03/18/98 <br />SOIL <br />Benzene <br />8020 <br />ND <br />Ethylbenzene <br />8020 <br />ND <br />Toluene <br />8020 <br />ND <br />Xylenes <br />8020 <br />ND <br />Diesel <br />8015M <br />500 <br />mg/Kg <br />03/20/98 <br />03/20/98 <br />Page 19 <br />P. O. Box 5624 • South San Francisco. California 94083 • 650.588-2838 FAX 588-1950 <br />