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North State Environmental Laboratory CA FLAP# 1753 <br /> 90 South Spruce Avenue, Suite V • South San Francisco CA 94050 - (650) 266-4563 • FAX (650) 266-4560 <br /> CERTIFICATE OF ANALYSIS <br /> Job Number 00-0307 Date Sampled 03/06/2000 <br /> Client Western Geo-Engineers Date Analyzed 03/09/2000 <br /> Pro3ect 8603-Over Ex Date Reported 03/13/2000 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control /Quality Assurance Summary <br /> Laboratory Number 00-0307 MS/MSD RPD <br /> Client ID Blank Recovery <br /> Matrix SOIL SOIL <br /> Analyte Results %Recoveries <br /> ug/Kg <br /> Methyl-t-Butyl Ether ND<50 <br /> 1,1-Dichlorcethene ND<5 72 8 <br /> Benzene ND<5 1!4 4 <br /> Trichloroethene ND<5 9.5 1 <br /> Toluene NA<5 101 1 <br /> Chlorobenzene n7D<5 109 8 <br /> SUR-Dibromofluorometh e 96% Rec 99/90 10 <br /> Toluene-d8 92% Rec 95/93 2 <br /> 4-Bromofluorobenz ne 108% Rec 106/105 1 <br /> Rq�vzewed 1ppr v d <br /> i <br /> John A Murphy <br /> Laboratory Director <br /> Page 2 Of 2 <br />