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0!%6, <br /> 0 North State Environmental <br /> Chemical Raste Disposal Trucking Consulting <br /> CERTIFICATE OF ANALYSIS <br /> Job Number 98-1642 Date Sampled 12/07/98 <br /> Client Western Geo-Engineers Date Analyzed 12/21/98 <br /> Pro]ect ARC Pump & Welding / Date Reported 12/30/98 <br /> Volatile Organics by GC/MS Method 8264 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 98-1642 MS/MSD RPD <br /> Client ID Blank Recovery <br /> Matrix WATER WATER <br /> Analyte Results %Recoveries <br /> ug/L <br /> Ethanol ND<500 <br /> Methyl-t-Butyl Ether ND<1 <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<1 <br /> 1,1-Dichloroethene ND<1 90/88 2 <br /> zene ND<1 108/106 2 <br /> chloroethene NLS<1 111/108 3 <br /> Qn <br /> uene ND<l 103/102 1 <br /> Chlorobenzene ND<1 109/108 1 <br /> SUR--Dibromofluoromethane 86 % Rec 92/88 4 <br /> SUR-Toluene-d8 98 % Rec 96/98 2 <br /> SUR-4-Bromofluorobenzene 103% Rec 100/101 1 <br /> Revi wed App <br /> /-moveed <br /> John A Murphy <br /> Laboratory Director <br /> is <br /> Page 2 Of 2 <br /> P 0 Box 5624 South San Francisco California 94083 650-588- 2838 FAX 588 - 1950 <br />