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©© North State Environmental <br />© Chemical Waste Disposal - Trucking • Consulting <br />CERTIFICATE OF ANALYSIS <br />Job Number: 98-305 <br />Client : Semco <br />Project : Corral Hollow Rd. <br />Date Sampled : 03/18/98 <br />Date Analyzed: 03/19/98 <br />Date Reported: 03/30/98 <br />Volatile Organics by GC/MS Method 8260 <br />Laboratory Number <br />98-305-07 <br />98-305-08 <br />98-305-09 <br />98-305-10 <br />98-305-41 <br />98-305-42 <br />Client ID <br />SS -1-7 <br />SS -1-8 <br />SS -1-9 <br />SS -1-10 <br />SS -5-1 <br />SS -5-2 <br />Matrix <br />SOIL <br />SOIL <br />SOIL <br />SOIL <br />SOIL <br />SOIL <br />Analyte <br />ug/Kg <br />ug/Kg <br />ug/Kg <br />ug/Kg <br />ug/Kg <br />ug/Kg <br />Ethanol <br />ND<2500 <br />ND<2500 <br />ND<2500 <br />ND<2500 <br />ND<2500 <br />ND<2500 <br />Methyl -t -Butyl Ether <br />ND<5 <br />ND<5 <br />7 <br />ND<5 <br />ND<5 <br />ND<5 <br />Di -isopropyl Ether <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />tertiary Butyl Alcohol <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />Ethyl -t -Butyl Ether <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />t -Amyl Methyl Ether <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />ND<5 <br />SDR-Dibromofluoromethasse <br />117% Rec <br />1018 Rec <br />103% Rec <br />81 6 Rec <br />1236 Rec <br />1318 Rec <br />SDR -Toluene -d8 <br />1146 Rec <br />1216 Rec <br />1186 Rec <br />94 6 Rec <br />1286 Rec <br />1356 Rec <br />SDR-4-Bromofluorobenzene <br />1226 Rec <br />1156 Rec <br />1136 Rec <br />83 6 Rec <br />1226 Rec <br />1186 Rec <br />Page 2 Of 5 <br />P. 0. Box 5624 • South San Francisco, California 94083 - 650-588-2838 FAX 588-1950 <br />