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(d&10'North State Environmental Chemical Waste Disposal • Trucking • Consulting <br />CERTIFICATE OF ANALYSIS <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 Method Result Unit Date Sampled Date Analyzed <br />Sample: 98-305-03 Client ID: SS -1-3 03/18/98 SOIL <br />Gasoline <br />8015M <br />ND 03/19/98 <br />Benzene <br />8020 <br />ND <br />Ethylbenzene <br />8020 <br />ND <br />MTBE <br />8020 <br />ND <br />Toluene <br />8020 <br />ND <br />Xylenes <br />8020 <br />ND <br />Lead <br />7420 <br />10 mg/Kg 03/23/98 <br />Sample: 98-305-04 Client ID: SS -1-4 03/18/98 SOIL <br />Gasoline 8015M ND 03/19/98 <br />Benzene 8020 ND <br />Ethylbenzene 8020 ND <br />MTBE 8020 ND <br />Toluene 8020 ND <br />Xylenes 8020 ND <br />Lead 7420 12 mg/Kg 03/23/98 <br />Page 2 <br />P. 0. Box 5624 • South San Francisco, California 94083 • 650-588.2838 FAX 588-1950 <br />