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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 (6i0) 266-4560 <br /> CERTIFICATE OF ANALYSIS <br /> Job Number 00-0254 Date Sampled 02/23/2000 <br /> Client Western Geo-Engineers Date Analyzed 02/28/2000 <br /> ProDect ARC Pump & Weld Date Reported 03/03/2000 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control./Quality Assurance Summary <br /> Laboratory Number 00-0254 PS/MSD RPD <br /> Client TD Blank Recovery <br /> Matrix WATER CATER <br /> Analyte Results YRecoveries <br /> ug/L <br /> Etnanol ND<100 <br /> Methyl-t-Butyl Et'7er ND<1 <br /> Di-isopropyl Ether ND<1 <br /> tertiary Butyl Alcohol ND<50 <br /> Ethyl-t-Butyl Ether ND<1 <br /> t-Amyl Methyl Ether ND<1 <br /> 1,1-Dichloroethene ND<1 72 1 <br /> �nzene ND<1 110 1 <br /> ichloroethene ND<1 104 1 <br /> Toluene //� ND<l 103 5 <br /> Chlorobenzene / ND<1 107 1 <br /> SUR--Dibromofluoromethane f 111% Rec 121/111 9 <br /> SUR-Toluene-d8 105% Rec 113/115 2 <br /> SUR-4-Bromofluorobenzene 111% Rec 109/107 2 <br /> Reviewed and App ed <br /> John A Murphy / <br /> Laboratory Director <br /> Page 2 Of 2 <br />