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North State Environmental Laboratory CA FLAP# 1753 <br /> 90 South Spruce A�enuz Suite V - South San Francisco CA 93080 • (650) 266-4563 • FAX (650) 266-4-560 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> Job Number 00-0254 Date Sampled 02/23/2000 <br /> Client Western Geo-Engineers Date Analyzed 02/28/2000 <br /> Project 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 S/MSD RPD <br /> Client ID Blank =ecovery <br /> Matrix WATER zTER <br /> Analyte Results =Recoveries <br /> ug/L <br /> o-Xylene ND<1 <br /> Styrene ND<1 <br /> Bromoform ND<l <br /> Isopropylbenzene ND<1 <br /> Bromobenzene ND<1 <br /> 1,1,2,2-Tetrachloroethane ND<1 <br /> n-Propyl Benzene ND<1 <br /> Chlorotoluene ND<l <br /> Chlorotoluene ND<1 <br /> 1,3,5-Trimethylbenzene ND<l <br /> tert-Butylbenzene ND<1 <br /> 1,2,4-Tri-methylbenzene ND<1 <br /> 1,3-Dichlorobenzene ND<1 <br /> 1,4-Dichlorobenzene ND<1 <br /> sec-Butylbenzene ND<1 <br /> 1,2-Dichlorobenzene ND<l <br /> p-Isopropyltoluene ND<1 <br /> n-Butylbenzene ND<1 <br /> 1,2-Dibromo-3-chloropropa ND<1 <br /> Naphthalene ND<l <br /> 1,2,4-Trichloxobenzene ND<1 <br /> xexachlorobutadiene ND<1 <br /> 1,2,3-Trichlorobenzene ND<l <br /> 1,2,3-Tri ;oropropane ND<l <br /> SUR-Dibr mofluoromethane 111% Rec -21/111 9 <br /> SUR-TLd 1051 Rec _3/115 2 <br /> SUR-4e 111% Rec -09/107 2 <br /> Revie <br /> John A Murphy <br /> Laboratory Director <br /> Page 4 Or 4 <br />