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0 9'4 <br /> North State Environmental <br /> ,A !Nk Chemical Waste Disposal - Trucking • Consulting <br /> CERTIFICATE OF ANALYSIS <br /> Job Number: 99-0445 Date Sampled : 03/25/99 <br /> Client Alton Geoscience Date Analyzed: 04/01/99 <br /> Project CHP-Stockton / PO# 25-0740-02 Date Reported: 04/07/99 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 99-0445 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<5 141 5 <br /> Benzene ND<5 114 2 <br /> Trichloroethene ND<5 142 12 <br /> Toluene ND<5 149 31 <br /> Chlorobenzene ND<5 112 4 <br /> SUR-Dibromofluoromethane 116% Rec 103/111 8 <br /> SUR-Toluene-d8 102% Rec 95/113 18 <br /> SUR-4-Bromofluorobenzene 105% Rec 83/86 3 <br /> Reviewed and Approved <br /> 47Murphy <br /> Laboratory Director <br /> P. 0 . Box 5624 South San Francisco , California 94083 650-588-2838 FAX 588 - 1950 <br />