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North State Environmental Laboratory CA FLAP# 1753 <br /> 90 South Spruce Avenue, Suite V • South San Francisco, CA 94080 • (650) 266-4563 • FAX (650) 266-4560 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> job Number 00-0296 Date Sampled 03/01/2000 <br /> Client Western Geo-Engineers Date Analyzed 03/06/2000 <br /> Project R603-OVER EXCAVA'T'ION Date Reported 03/08/2000 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Dumber 00-0296 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-Dichloroethene ND<5 46 7 <br /> Benzene ND<5 92 2 <br /> Trichloroethene NTD<5 82 10 <br /> Toluene ND<5 87 7 <br /> Chlorobenzene ND<5 99 9 <br /> SUR-Dibromofluoromethane 100% Rec 102/106 4 <br /> SUR-Toluene-d8 102% Rec 100/101 1 <br /> 0--4-Bromofluorobenzene 100% Rec 108/107 1 <br /> aew and p ed <br /> L/ I <br /> f <br /> John A Murphy <br /> Laboratory Director <br /> • <br /> Page 3 Of 3 <br />