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4,�Nhk <br /> North State Environmental <br /> Chemical Waste Disposal Trucking Consulting <br /> CERTIFICATE$0 <br /> OF ANALYSIS <br /> Job Number 99-0038 Date Sampled 01/11/99 <br /> Client Western Geo-Engineers Date Analyzed 01/20/99 <br /> -Project 8603 / Stockton Date Reported 01/27/99 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 99-0038 MS/MSD RPD <br /> Client ID Blank Recovery <br /> Matrix WATER WATER <br /> Analyte Results %Recover]es <br /> ug/L <br /> Methyl-t-Butyl Ether ND<1 <br /> 1,1-Dichloroethene ND<l 47 5 <br /> Benzene ND<1 104 5 <br /> Trichloroethene ND<1 109 2 <br /> Toluene ND<1 109 4 <br /> Chlorobenzene ND<l 97 2 <br /> tIR-Dibromofluorornethane 111% Rec 122/118 3 <br /> -Toluene-d8 99% Rec 102/102 0 <br /> -4-Bromofluorobenzene 102% Rec 105/105 0 <br /> zxproved <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 />