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North State Environmental <br /> ,OAR SN6.'4V <br /> Chemical Waste Disposal Trucking Consulting <br /> CERTIFICATE OF ANALYSIS <br /> Job Number 98-342 Date Sampled 03/26/98 <br /> Client Western Geo-Engineers Date Analyzed 04/03/98 <br /> Pro3ect Date Reported 04/03/98 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 98-342 MS/MSD RPD <br /> Client ID Blank Recovery <br /> Matrix SOIL SOIL <br /> Analyte Results %Recoveries <br /> ug/Kg <br /> Ethanol ND<2500 <br /> Methyl-t-Butyl Ether ND<5 <br /> Di-isopropyl Ether ND<5 <br /> tertiary Butyl Alcohol ND<5 <br /> Ethyl-t-Butyl Ether ND<5 <br /> t-Amyl Methyl Ether ND<5 <br /> 1,1-Dichloroethene ND<5 68 2 <br /> Wenzene ND<5 92 4 <br /> richloroethene ND<5 88 4 <br /> Toluene ND<5 90 4 <br /> Chlorobenzene ND<5 98 1 <br /> SUR-Dibromofluoromethane 95 8 Rec 97/98 1 <br /> SUR-Toluene-dB 102 Rec 100/101 1 <br /> SUR-4-Bromoflucrobenzene 99 % Rec 102/102 0 <br /> Reviewed andApproved <br /> John A Murphy <br /> Laboratory Director <br /> Page 2 Of 2 <br /> P 0 Box 5624 • South San Francisco, California 94083 650-588- 2838 FAX 588 - 1950 <br />