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t <br /> North State Environmental <br /> Chemical IAaste Disposal Trucking Consulting <br /> CERTIFICATE OF ANALYSIS <br /> Job Number 9$-1642 Date Sampled 12/07/98 <br /> Client Western Geo-Engineers Date Analyzed 12/21/98 <br /> Pro3ect ARC Pump & Welding / Date Reported 12/30/98 <br /> volatile Organics by GC/MS Method 8250 <br /> Laboratory Number 98-1642-01 98-1642-02 98-1642-03 <br /> Client ID MW-1 MW-2 NW--3 <br /> Matrix WATER WATER WATER <br /> Analyte ug/L ug/L ug/L <br /> Ethanol ND<500 ND<500 ND<500 <br /> Methyl-t-Butyl Ether 110 86 72 <br /> Di-isopropyl Ether ND<5 ND<5 IdD<5 <br /> tertiary Butyl Alcohol ND<5 ND<5 ND<5 <br /> Ethyl.-t-Butyl Ether ND<5 ND<5 ivy<5 <br /> t-Amyl Methyl Ether 3 28 ND<1 <br /> SUR-Dibromoflucromethane 93 % Rec 94 % Rec 91 % Rec <br /> Toluene-de 105% Rec 107% Rec 105% Rec <br /> -4-Bromofluorobenzene 115% Rec 116% Rec 114% Rec <br /> I <br /> I <br /> I <br /> Page 1 Of 2 <br /> P 0 Box 5624 - South San Francisco California 94083 650- 588- 2838 FAX 588 - 1950 <br />