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©North State Environmental <br />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 <br />Result Unit <br />Date Sampled Date Analyzed <br />Sample: 98-305-46 <br />Client ID: SS -7-2 <br />03/18/98 SOIL <br />Benzene 8020 <br />0.008 mg/Kg <br />03/20/98 <br />Ethylbenzene 8020 <br />ND <br />Toluene 8020 <br />ND <br />Xylenes 8020 <br />ND <br />Diesel 8015M <br />ND <br />03/20/98 <br />Sample: 98-305-47 <br />Client ID: D1-48 <br />03/18/98 SOIL <br />Gasoline 8015M <br />ND <br />03/19/98 <br />Benzene 8020 <br />ND <br />Ethylbenzene 8020 <br />ND <br />MTBE 8020 <br />ND <br />Toluene 8020 <br />ND <br />Xylenes 8020 <br />ND <br />Lead 7420 <br />9 mg/Kg <br />03/23/98 <br />Sample: 98-305-48 <br />Client ID: 01-72 <br />03/18/98 SOIL <br />Gasoline 8015M <br />ND <br />03/19/98 <br />Benzene 8020 <br />ND <br />Ethylbenzene 8020 <br />ND <br />MTBE 8020 <br />ND <br />Toluene 8020 <br />ND <br />Xylenes 8020 <br />ND <br />Page 18 <br />P. O. Boz 5624 • South San Francisco, California 94083 • 650-588-2838 FAX 5 88- 1950 <br />